Senior Software Engineer (JVM & Kotlin)

🏢 Summary: Backend engineering role within the Kernel team focused on developing and improving a critical execution engine that runs pricing models safely and reliably at scale. The position involves implementing backend enhancements, strengthening automated testing, and supporting debugging and internal tooling while growing expertise in systems engineering. It offers hybrid work in Warsaw with competitive salary and long-term development in high-impact AI-driven infrastructure. 🗂️ Requirements: Experience building backend components or services in Python or a strongly typed compiled language (Rust, Go, Java, Kotlin, C, C++), Experience writing automated tests for backend code, Strong knowledge of data structures and algorithms, Ability to debug software issues using logs, metrics, and reproducible scenarios, Experience collaborating through code reviews or pair programming, Willingness to learn Rust and deepen systems engineering expertise 📃 Skills: Python, Rust, Go, Java, Kotlin, C, C++, Backend, Testing, Algorithms, Data-structures, Debugging, Git, Linux 🏢 Description: Location: Hybrid 2 days per week, based in Warsaw Salary for Associate (IC1) : UoP (Contract of Employment) = 13,000 - 18,000 PLN per month gross B2B = 15,000 - 21,000 PLN per month net +VAT About hyperexponential (hx) At hyperexponential, we're building the AI-powered platform that enables the world's most critical decisions in a $7 trillion industry, which risks to take, and how to price them. These are the decisions that shape real-world outcomes: whether rockets successfully launch into space, autonomous vehicles make it to market, or communities recover after major storms. Until now, insurance has been making billion-dollar decisions using outdated tools. We're changing that. Our platform brings together data, AI, and human expertise to give insurers the fastest path from submission to decision - helping them move faster, act smarter, and take on more risk with confidence. Backed by a16z, Highland Europe, and Battery Ventures, we're scaling globally - already trusted by nearly 50 of the world's largest insurers, with zero churn and billions in premiums flowing through hx. What began as a single product in one market has rapidly evolved into a multi-product, multi-territory platform powering every stage of pricing and underwriting. AI is at the core of what we do - from building the world's first domain-specific AI peer programmer for insurance (think GitHub Copilot with a PhD in actuarial science) to shaping agentic workflows that reinvent how this industry operates. What makes hx different is the people who build it. Here, impact isn't tied to title or tenure; it's defined by the challenges you take on and the discipline you bring. Surrounded by peers who stretch you, you'll do the best, hardest work of your life in a company engineered to endure. If that sounds like you, join us in building what comes next. About the Kernel team The Kernel team sits at the core of hx’s platform, responsible for the execution engine that runs pricing models safely, reliably, and at scale. Their work underpins the decisions insurers make using hx, ensuring complex pricing logic executes consistently while maintaining the performance and reliability required for mission critical underwriting workflows. Within this space, the team builds and maintains the systems that interpret, execute, and validate model logic. This includes improving the safety and determinism of execution, strengthening automated testing and verification, and developing tools that allow engineers and actuaries to trust the platform when deploying high value pricing models. In this role, you will support the Kernel team by contributing well scoped features, tests, and internal tooling while learning how the execution engine works end to end. You will work closely with experienced engineers to understand the architecture, investigate issues, and gradually take on more complex ownership as your understanding of the system grows. Your engineering responsibilities Implement small, well scoped backend improvements within the Kernel execution engine, delivering reliable changes that strengthen the stability and correctness of model execution. Extend and maintain automated test suites that validate execution behaviour, increasing confidence in changes and helping the team maintain a high standard of safety in a critical system. Contribute to internal tooling and scripts that support testing, debugging, and developer workflows, improving the speed and reliability with which the team can analyse Kernel behaviour. Assist with structured debugging investigations by running defined scenarios, collecting logs and metrics, and summarising findings that help engineers identify root causes more quickly. Learn the architecture and execution model of Kernel through hands on development and collaboration, steadily progressing from small tasks to more complex changes within the system. Work closely with experienced engineers through reviews and pairing, contributing to a collaborative engineering culture while building the discipline required to operate safely in a high impact backend system. What you need to be successful Built backend components or services in Python, or a strongly typed compiled language such as Rust, Go, Java, Kotlin, C, or C++, delivering reliable functionality and maintainable code in production or academic systems. Written automated tests for your own work, helping ensure changes behave as expected and maintaining confidence in system correctness as software evolves. Applied core computer science fundamentals such as data structures and algorithms to implement efficient and reliable backend logic. Investigated software issues by reproducing problems, gathering relevant logs or data, and clearly communicating observations and hypotheses to collaborators. Collaborated effectively with other engineers through code reviews, pair programming, or mentorship, responding constructively to feedback and improving your work through iteration. Demonstrated a strong learning mindset by picking up new technologies or languages, with enthusiasm to develop expertise in Rust and systems engineering over time. Interview Process Initial call with Talent team (30 minutes) Manager Interview with Technical Assessment (90 minutes) Values Interview with Tech Leadership (60 minutes) Offer How hx Warsaw Works At hyperexponential, we believe in a balance between remote work, and building relationships across teams and locations. You’ll have your main office in Warsaw, 2 days a week, with also ability to travel to London HQ to meet the wider team. International travel will be much less frequent, perhaps 2-3 times a year. Warsaw HQ was established in 2023, quickly hiring our first handful of high-calibre engineers. Fast-forward to today in 2026, there are 50+ in Warsaw and surrounding cities who travel for the collaborative environment. On Wednesdays you’ll often find Warsaw HQ organising team lunch paid by hx, getting drinks after hours. The office is also dog-friendly, so feel free to bring yours along! What Your Offer Could Look Like B2B Share Options at a highly successful Series B company 25 days of non-working + Polish bank holidays £5,000 GBP budget for Learning & Development Mental Health Support and Therapy via Spectrum Life Optional for you: access to Private Healthcare via Luxmed + Multisport (fully funded by yourself as B2B Contractor) Top-spec laptop (MacOS or Windows) Contract of Employment (UoP) Share Options at a highly successful Series B company £5,000 GBP budget for Learning & Development 26 days of holiday + Polish bank holidays Company pension Company Sick Pay for 10 days at 100% salary Mental Health Support and Therapy via Spectrum Life Monthly Wellbeing allowance via Juno Private Healthcare Insurance via Luxmed Multisport - Classic level Top-spec work equipment (MacOS, Windows + additional monitors, mechanical keyboards etc)

🏢 Summary: Technical Quality Engineering role focused on building and scaling AI-powered test automation and quality self-service systems across engineering teams. The position centers on developing AI-driven E2E testing tools, automated failure analysis, and scalable release quality standards to enable engineers to own quality independently. It combines hands-on test automation, AI tooling development, and cross-team technical enablement in a rapidly evolving environment. 🗂️ Requirements: Experience building AI-powered tools or automations in production environments, Experience designing and implementing automated test strategies across unit, integration, and E2E levels, Hands-on experience with end-to-end test automation using Python and Playwright or equivalent, Ability to design and maintain scalable, reliable automated test frameworks, Experience integrating automation and analysis tools into CI pipelines, Experience coaching engineers on testing practices and improving team-owned quality, Ability to operate effectively in ambiguous, fast-changing environments 📃 Skills: Python, Playwright, AI, LLM, RAG, CI, Automation, Testing, E2E, UnitTesting, IntegrationTesting 🏢 Description: Location: Hybrid 2 days per week, based in Warsaw (Czackiego 15/17). We're open to candidates based outside Warsaw, provided the 2-day commitment is realistically sustainable from where you live. Please don't treat this as a starting point for negotiation - we value the structure and consistency it brings and we want you to see the value in it too. If you're based further away, we'll assume openness to relocation is part of the conversation. About hyperexponential (hx) At hyperexponential, we're building the AI-powered platform that enables the world's most critical decisions in a $7 trillion industry, which risks to take, and how to price them. These are the decisions that shape real-world outcomes: whether rockets successfully launch into space, autonomous vehicles make it to market, or communities recover after major storms. Until now, insurance has been making billion-dollar decisions using outdated tools. We're changing that. Our platform brings together data, AI, and human expertise to give insurers the fastest path from submission to decision - helping them move faster, act smarter, and take on more risk with confidence. Backed by a16z, Highland Europe, and Battery Ventures, we're scaling globally - already trusted by nearly 50 of the world's largest insurers, with zero churn and billions in premiums flowing through hx. What began as a single product in one market has rapidly evolved into a multi-product, multi-territory platform powering every stage of pricing and underwriting. AI is at the core of what we do - from building the world's first domain-specific AI peer programmer for insurance (think GitHub Copilot with a PhD in actuarial science) to shaping agentic workflows that reinvent how this industry operates. What makes hx different is the people who build it. Here, impact isn't tied to title or tenure; it's defined by the challenges you take on and the discipline you bring. Surrounded by peers who stretch you, you'll do the best, hardest work of your life in a company engineered to endure. If that sounds like you, join us in building what comes next. About the team Quality Engineering at hx is undergoing a strategic shift. We're moving from an embedded model, where QEs sit in product teams and deliver hands-on testing, to an enablement model, where a small central team builds the tools, standards, and coaching that help every engineer own quality. It's one of hx's boldest engineering experiments: making quality genuinely self-service without sacrificing the rigour our customers rely on. The team sits at the intersection of test automation, AI tooling, release readiness, and organisational change. We're building AI-powered systems that make end-to-end test creation accessible to all engineers, automate failure classification and routing, and provide the standards, guidance, and feedback loops teams need to make better quality decisions independently. That means shaping quality strategy, improving release risk assessment, and establishing lightweight, scalable processes for staging, deployment, and learning from failure. This is strategic work with company-wide impact, requiring technical depth, strong technical judgement, coaching capability, and comfort with ambiguity. As the third member of this newly formed team, you'll join at a pivotal moment. You'll contribute to the managed transition away from embedded QE support, take ownership of AI-powered automation tools still being defined, and build the foundations that allow hx to scale quality across dozens of engineering teams. Your work will shape whether teams can ship independently, whether release processes stay fast and trusted as we grow, and whether hx can maintain velocity without compromising reliability. Check out our Engineering Candidate Hub for a behind the scenes look at the team you would be joining! What you'll be doing Accelerate the development and adoption of hx's AI-powered end-to-end test writing agent, improving its accuracy and framework coverage to the point where at least 15 engineers across 5+ teams are independently writing E2E tests within six months of widespread release. Design and deploy an AI-powered nightly build analyser that automatically classifies test failures and routes them to owning teams, reducing daily manual review effort by 80% and proving reliable enough to extend to the release pipeline. Establish quality self-service foundations for product teams by delivering test design guidance, executable E2E framework documentation (as AI agent specifications), quality standards references, and release risk assessment templates that enable at least three teams to complete release assessments without direct QE involvement. Support the managed withdrawal of QE support from embedded product teams by contributing to fixed-scope deliverables that ensure no critical gaps in E2E coverage or delivery confidence, enabling both current QEs to transition on schedule with no unplanned regressions. Grow E2E test coverage across the organisation through coaching, pairing, and AI tooling support, increasing the number of product teams writing their own E2E tests to at least 50% within the first 12 months. Build credibility and influence across engineering teams by working alongside engineers to solve real quality challenges, demonstrating the value of team-owned quality through concrete examples rather than process mandates, and making quality ownership feel like teams' own goal rather than an external requirement. What you'll need to have done Built AI-powered tools or automations in production environments (e.g., prompt engineering, agent design, RAG pipelines, or CI-integrated analysis), demonstrating the ability to design solutions others rely on rather than just using AI assistants as coding aids. Designed and implemented automated test strategies across multiple test levels (unit, integration, E2E) for complex systems, making sound judgements about what to test at which level and communicating those trade-offs clearly to non-specialist engineers. Owned end-to-end test automation using Python and Playwright (or equivalent frameworks), writing clean, maintainable tests with clear patterns that other engineers can extend, including experience managing flaky test suites and establishing conventions for new automation from scratch. Coached or enabled engineering teams to improve their testing practices through hands-on pairing and mentoring, demonstrating measurable improvements in team capability such as increased test coverage, reduced manual testing dependencies, or improved release confidence. Influenced quality improvements across teams you didn't directly manage, building credibility through practical demonstration and making benefits concrete rather than relying on process mandates or formal authority. Operated effectively in environments characterised by ambiguity and rapid change, taking ownership of problems from identification through to iterative solution, and adapting approach based on feedback without losing momentum. You're unlikely to thrive here if You prefer clearly defined processes and established playbooks over building the systems and standards from first principles in a rapidly evolving environment. You're more comfortable being the person who delivers quality work directly rather than enabling others to build that capability themselves, or you measure success primarily by your own output rather than what teams can achieve independently. You view AI tools with scepticism or aren't genuinely curious about how to apply them practically to solve real engineering problems, or you're unwilling to learn new languages and frameworks as the problem demands. If reading our Culture Document leaves you feeling neutral rather than energised, hx may not be the place where you'll do your best work. We're building something that asks for commitment and conviction, and we want you to feel excited by the opportunity to grow with us. Compensation At hx, we're committed to salary transparency. You'll always have clarity on pay early in the process - our Talent Partner will share details with you during initial conversations - and we're working towards publishing salary information for all roles globally. Because we're building at the intersection of technology/SaaS and insurance, our roles don't always map neatly onto traditional benchmarks. Our approach is to design compensation that's competitive in the market, fair across teams, and aligned with the impact our people make. Equity: We offer equity across all roles at hx, making it a significant component of total compensation. Your talent partner will be able to share more details about this. Benefits Depending on how you choose to join hx (B2B or UoP), your benefits can look like: B2B Share Options at a highly successful Series B company. 25 days of non-working + 14 Polish bank holidays. £5,000 budget for Learning & Development. Mental Health Support and Therapy via Spectrum Life. Optional for you: access to Healthcare package provided by Luxmed + Multisport (fully funded by yourself as B2B Contractor). Top-spec laptop (MacOS or Windows). Contract of employment (UoP) Share Options at a highly successful Series B company. £5,000 budget for learning & development. 26 days of holiday + 14 Polish bank holidays. Company pension. 10 days company sick pay at 100% salary, thereafter in line with labour law. Mental health support and therapy via Spectrum Life. Monthly wellbeing allowance via Juno. Healthcare package provided by Luxmed. Multisport card at Classic level. Top-spec work equipment (MacOS / Windows + additional monitors, mechanical keyboards etc). Additional perks Top-spec equipment (laptop, screens, adjustable desks, etc.). Regular remote and in-person hackathons, lunch and learns, socials, and game nights. Team breakfasts and lunches, snacks, drinks fridge, and a fun office at The Brain Embassy . Exceptional opportunities for personal development and growth as we build something remarkable together. Interview process Talent Partner Screen Hiring Manager Interview Technical Assessment (e.g., code review, system design) Values Interview with Tech Leadership (60 minutes). We Offer! Our commitment to Diversity hxers are at the centre of everything we build. We know that progress depends on diverse perspectives, and we are committed to creating an environment where everyone can thrive, grow, and make an impact. We recognise there is always more to do, and we take responsibility for shaping a workplace that is not only diverse but genuinely inclusive. Diversity is not just the right thing to do, it is key to solving the complex challenges we choose to take on. By welcoming people from all backgrounds and experiences, we strengthen our ability to question assumptions, push boundaries, and design solutions that endure. If you're energised by complexity and motivated to grow, we encourage you to apply and join our global team. Next steps If this opportunity resonates with you, we encourage you to apply or share it with your connections! Our dedicated talent team reviews all applications, and we promise to provide feedback regardless of the outcome. For more information about applying and to view other opportunities, you can visit our careers page.

🏢 Summary: The offer is for a Senior Robotics Software Engineer responsible for developing and scaling core robotics software, leading migration to ROS2, and implementing Digital Twins in Nvidia IsaacSim. The role focuses on building robust control systems, accurate simulations, and real-world interaction logic for intelligent robots operating in production. It combines advanced software engineering with hands-on robotics challenges in a hybrid work model. 🗂️ Requirements: Strong proficiency in Python or C++, Experience with ROS or ROS2, Experience with simulation tools (Gazebo, Nvidia IsaacSim, Nvidia Omniverse), Experience with cloud technologies, Ability to design modular control systems, Experience with robotics projects or R&D initiatives, Fluent English 📃 Skills: Python, C++, ROS, ROS2, Gazebo, IsaacSim, Omniverse, Cloud, Robotics, Simulation 🏢 Description: Location: Warsaw (Hybrid - 5 days in the office / month) Salary: 26,000 - 32,000 PLN gross (Employment Contract) + Equity Contract Type: Employment Contract (eligible for 75% tax-deductible costs / AKUP) 🚀 Our Client For our Client - a fast-growing deep-tech startup backed by top VC funds - we are looking for a hybrid engineer who bridges the gap between high-level software and physical hardware. The company is in the best position globally to solve the "Physical AI deployment gap" - currently the hottest topic in Artificial Intelligence. They build intelligent robots that are already operating at scale, and they are looking for someone to help "teach" these robots to understand the real world. The engineering team consists of veterans from Google, Nvidia, ByteDance , and top robotics companies. The organization values a culture of ownership, offering freedom to build amazing things without micro-management. 🎯 Your Role in the Team As a Senior Robotics Software Engineer, you will face hard technical problems right from the start. Key challenges for the first 3 months include migrating the technology stack to ROS2 and introducing "Digital Twins" in Nvidia IsaacSim . You will: Core Robotics Development: Design and implement modular control systems. The team needs robust code, not just high-level GUI configurations. Simulation & Digital Twins: Work with Nvidia IsaacSim / Omniverse to create accurate simulations that speed up deployment. ROS2 Migration: Lead the architectural shift to ROS2 to ensure the robots are future-proof. Handle Reality: Develop heuristics to handle physical interactions and detect anomalies (e.g., verifying if a robot picked the correct item). Mentoring: Share your software and design experience with the team, promoting leadership and technical excellence. What We Expect ✅ The ideal candidate combines strong Core Software Skills with a genuine passion for Robotics. Software Engineering Core: Strong proficiency in Python or C++ and Cloud technologies. Robotics Stack: Experience with ROS / ROS2 and simulation tools like Gazebo, Nvidia IsaacSim, or Nvidia Omniverse . Engineering Background: Candidates with a background in student robotics projects or similar R&D initiatives are highly valued. The Right Mindset: If you have prior experience with robotics technologies but later worked as a "standard" software engineer, you are a perfect fit! Language: Fluent English. Note: The client is NOT looking for specialists experienced only in programming industrial robots via high-level GUIs. What We Offer 🎁 Top Compensation: 26k-32k PLN gross + 75% Tax-Deductible Costs (AKUP). Equity: Significant equity package – you become a co-owner of the company. Real Impact: You will see your code powering robots in production environments, solving problems no one has solved before. Best Team: Work with and learn from engineers who built Google Warsaw, unicorn startups (Climate Corp), and tested rocket engines. Freedom & Responsibility: Flexible working hours and a hybrid model (partly remote work possible). The company trusts its engineers to do their job effectively. Ready to close the Physical AI deployment gap? Apply now!

🏢 Summary: Hybrid Backend Engineer role focused on building scalable distributed systems, APIs, and data processing pipelines for a global developer platform. The position involves working with Java, Scala, and Apache Spark on large-scale products used worldwide, with relocation to Sweden required. The role combines hands-on development, architecture discussions, and cross-functional collaboration. 🗂️ Requirements: Commercial experience in backend development, Strong knowledge of Java, Strong knowledge of Scala, Experience with Apache Spark, Experience building distributed systems, Experience designing and developing APIs, Ability to work on-site in Malmö (3–4 days/week initially), Willingness to relocate to Sweden, Experience with data processing pipelines, Experience with CI/CD and code reviews 📃 Skills: Java, Scala, Spark, API, CI/CD, DistributedSystems, DataProcessing 🏢 Description: Salary: Mid Developer: up to 1120 PLN/MD on B2B Senior Developer: up to 1500 PLN/MD on B2B Work model: Hybrid – for the first 3–4 months required 3 days/week on-site in Malmö (Sweden), with travel and accommodation covered by the company, followed by relocation to Sweden with a requirement to work 3–5 days per week from the office, along with a rate evaluation after relocation. Why choose this offer? - Opportunity to work on global-scale products used by millions of users worldwide - Collaboration within international, cross-functional teams - Exposure to modern backend technologies (Scala, Java, Spark) - Chance to build scalable APIs and developer-facing tools - Impact on end-to-end feature development – from concept to production - Work in an environment that values ownership, independence, and collaboration Project You will join a team working on a developer platform powering advanced digital products and services. The role focuses on building scalable backend solutions, APIs, and tools that support large-scale applications and external developers. As a Backend Engineer, you will contribute to designing and implementing distributed systems, processing large datasets, and enabling seamless integration between services. You will collaborate closely with engineering, data, and product teams to deliver high-quality solutions used in a global ecosystem. The role combines hands-on development with active participation in architecture discussions, problem-solving, and cross-team collaboration. Responsibilities: - Design, develop and maintain scalable backend systems and services - Build and optimize data processing pipelines using tools such as Apache Spark - Develop and maintain APIs and backend components for developer-facing platforms - Translate business and technical requirements into robust, high-quality code - Collaborate with cross-functional and international teams (engineering, product, data) - Participate in architecture discussions and propose improvements to system design - Ensure performance, reliability, and scalability of delivered solutions - Contribute to code reviews, testing, and CI/CD processes - Work both independently and collaboratively to solve complex technical problems Technologies: - Java - Scala - Apache Spark - Distributed systems - Data processing - API design - Backend architecture

🏢 Summary: Backend Engineer role focused on building scalable backend systems, APIs, and data processing solutions for a global developer platform used by millions of users. The position involves working with distributed systems and large datasets in an international environment, with initial on-site work in Malmö followed by relocation to Sweden. Offers competitive B2B rates and the opportunity to contribute end-to-end from architecture discussions to production deployment. 🗂️ Requirements: Commercial experience in backend development, Strong knowledge of Java, Strong knowledge of Scala, Experience with Apache Spark, Experience with distributed systems, Experience building and maintaining APIs, Ability to design scalable backend architectures, Experience with data processing pipelines, Experience with CI/CD processes, Ability to work on-site in Malmö and relocate to Sweden 📃 Skills: Java, Scala, Spark, Apache, DistributedSystems, APIs, CI/CD, Backend, DataProcessing 🏢 Description: Salary: Mid Developer : up to 1120 PLN/MD on B2B Senior Developer : up to 1500 PLN/MD on B2B Work model: hybrid , for the first 3-4 months required 3 days/week on-site in Malmö (Sweden), with travel and accommodation covered by the company, followed by relocation to Sweden with a requirement to work 3-5 days per week from the office, along with a rate evaluation after relocation. Why choose this offer? Opportunity to work on global-scale products used by millions of users worldwide Collaboration within international, cross-functional teams Exposure to modern backend technologies (Scala, Java, Spark) Chance to build scalable APIs and developer-facing tools Impact on end-to-end feature development – from concept to production Work in an environment that values ownership, independence, and collaboration Project You will join a team working on a developer platform powering advanced digital products and services. The role focuses on building scalable backend solutions, APIs, and tools that support large-scale applications and external developers. As a Backend Engineer, you will contribute to designing and implementing distributed systems, processing large datasets, and enabling seamless integration between services. You will collaborate closely with engineering, data, and product teams to deliver high-quality solutions used in a global ecosystem. The role combines hands-on development with active participation in architecture discussions , problem-solving , and cross-team collaboration . Responsibilities you'll have: Design, develop and maintain scalable backend systems and services Build and optimize data processing pipelines using tools such as Apache Spark Develop and maintain APIs and backend components for developer-facing platforms Translate business and technical requirements into robust, high-quality code Collaborate with cross-functional and international teams (engineering, product, data) Participate in architecture discussions and propose improvements to system design Ensure performance, reliability, and scalability of delivered solutions Contribute to code reviews, testing, and CI/CD processes Work both independently and collaboratively to solve complex technical problems Technologies you'll work with Java Scala Apache Spark GIS/Mapping Technologies Distributed systems & data processing API design & backend architecture Client – why choose this particular client from the Jit portfolio? Our client is a leading multinational technology organization with a strong international presence. Serving customers worldwide, it offers a broad range of consumer electronics, software, and digital solutions aimed at enhancing user experience and connectivity. The organization is renowned for its innovative approach and its ability to create a seamless ecosystem that integrates its products and services. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: The offer is for a Mid/Senior Software Engineer responsible for building and maintaining scalable integrations between platforms such as MN, HubSpot, NetSuite, and internal systems. The role focuses on backend development, event-driven architectures, and automation to ensure reliable, secure, and observable system communication. You will work in an international environment delivering integration solutions that support end-to-end business processes. 🗂️ Requirements: Strong experience with Kotlin backend development, Experience with Python for scripting and data processing, Practical experience with AWS and infrastructure provisioning, Experience with Terraform, Hands-on experience with Kafka and event-driven architectures, Experience in building REST APIs, Experience with CI/CD tools, Basic knowledge of SQL, Experience with system integrations and distributed systems, Ability to operate systems including deployment, monitoring, troubleshooting 📃 Skills: Kotlin, Python, AWS, Terraform, Kafka, REST, SQL, HubSpot, GitHub, Grafana, CI/CD 🏢 Description: Salary: Mid 700-1000 pln/md B2B | Senior 1000-1300 pln/md B2B Remote: 100% or hybrid (Gdynia/Gdańsk/Warszawa/Kraków/Rzeszów) Why choose this offer? You can expect a flexible work organization The international work environment will allow you to interact with the English language daily Scandinavian organizational culture will provide you with a work-life balance The Jit community will bring you a nice time during regular integration meetings Project We're looking for a strong Mid/Senior Software Engineer to help build and maintain integrations across key business platforms such as MN, HubSpot, NetSuite, and other internal systems. You will work on scalable, secure, and automated solutions that improve system reliability and enable seamless end-to-end collaboration between systems. You’ll be part of an international, fast-growing tech environment focused on transforming public procurement, working closely with Technology and RevOps teams. What you'll be doing Developing integration solutions between MN, HubSpot, NetSuite, and internal platforms Designing and building scalable, secure, and maintainable backend services Operating integrated systems (deployment, monitoring, troubleshooting) Creating scripts and tools to automate business processes and workflows Maintaining and improving HubSpot workflows and integrations Collaborating with cross-functional teams to ensure smooth E2E system communication Ensuring high system reliability, performance, and observability Expected competencies and knowledge: Strong hands-on experience with Kotlin for backend development Solid experience with Python for scripting and data processing Practical knowledge of AWS and infrastructure provisioning (preferably with Terraform) Experience working with Kafka for event-driven architectures Strong understanding and experience in building REST APIs Familiarity with system integrations and distributed systems Experience with CI/CD tools (GitHub Actions is a plus) Basic knowledge of SQL Experience with monitoring tools (e.g. Grafana) is a plus Knowledge of HubSpot or willingness to learn Ability to work independently and in a collaborative environment Technologies you'll work with Kotlin Python AWS (Terraform) Kafka REST APIs HubSpot GitHub Actions Grafana SQL Client – why choose this particular client from the Jit portfolio? Our client is a Scandinavian supplier of software and services for purchasing and tendering processes in highly formalized conditions, such as orders in accordance with public procurement law at the level of the European Union or individual member states. The delivery center is located in Utrecht. Client’s platforms allow to announce tenders and conduct the entire procedure of collecting and evaluating offers at every stage of the purchasing process. They are used both by public administration bodies at various levels in European countries and by purchasing departments of large companies and corporations. About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.

🏢 Summary: Senior Software Engineer role focused on building and scaling enterprise-grade compensation and rewards platforms using full-stack technologies and AI-powered features. The position involves end-to-end product development, technical ownership, and close collaboration with Product and Design teams in a hybrid startup-like environment. 🗂️ Requirements: 5+ years building full-stack customer-facing web applications, Experience with TypeScript, Experience with Node.js, Experience with React, Ability to translate user needs into technical solutions, Ability to work in ambiguous environments, Strong code quality and testing practices, Strong system reliability practices, Collaboration skills, Technical leadership skills 📃 Skills: TypeScript, Node.js, React, MySQL, Redis, AI 🏢 Description: Position: Senior Software Engineer Location: Krakow, hybrid working model- 3 days per week from the office Salary: 28 000 – 33 000 PLN About the company Our client is building a modern platform that helps organizations manage compensation and effectively communicate pay, rewards, and benefits. Their products are designed to bring greater transparency, trust, and clarity to compensation decisions for both employees and candidates. The company focuses on delivering enterprise-grade solutions for large, global organizations, leveraging advanced technologies and AI-driven capabilities. Operating in a fast-paced, startup-like environment, they offer engineers strong ownership and real impact on product direction. Their platform is used by leading companies to make smarter compensation decisions and improve employee experience. Role summary In this role, you will be responsible for designing and building high-quality product experiences related to compensation communication and rewards. You will work end-to-end, from shaping requirements and technical design to implementation and post-release improvements. The position offers a high level of ownership and influence over technical direction, product quality, and engineering standards. You will play a key role in scaling the product for enterprise customers while collaborating closely with Product and Design teams. This is an opportunity to combine strong engineering skills with product thinking in a high-impact environment. Responsibilities Design and build end-to-end product features (full-stack) Develop scalable solutions for enterprise-level organizations Build AI-powered features to support compensation decision-making Contribute to system architecture and engineering best practices Collaborate closely with Product and Design on roadmap and priorities Ensure high standards of code quality, testing, and reliability Solve complex technical and product challenges Requirements 5+ years of experience building customer-facing web applications (full-stack) Strong product mindset and ability to translate user needs into technical solutions Experience with technologies such as TypeScript, Node.js, and React Ability to work in ambiguous environments and break down complex problems High standards for code quality, testing, and system reliability Strong collaboration and technical leadership skills Nice to have: Experience in HR Tech, compensation, or workforce management domains Experience building enterprise-grade B2B software (e.g., permissions, audit logs, data controls) Familiarity with MySQL and Redis Experience using AI tools to enhance productivity Interest in mentoring and supporting team growth Offer: B2B contract Hybrid working model- 3 days per week from the office High level of ownership and impact on product and technology Fast-paced, startup-like environment Opportunity to work with an experienced engineering team Competitive salary and benefits package (e.g., private healthcare, learning budget – depending on the offer)

🏢 Summary: Senior Software Engineer role focused on designing and delivering full-stack, enterprise-grade web features for a modern compensation and rewards platform. The position involves end-to-end ownership from technical design to implementation, contributing to scalable architecture and AI-powered capabilities. It offers high impact on product direction and engineering standards in a fast-paced environment. 🗂️ Requirements: 5+ years experience building full-stack customer-facing web applications, Proficiency in TypeScript, Node.js, React, Experience designing scalable enterprise-level solutions, Experience building AI-powered features, Strong understanding of system architecture, Ability to ensure code quality, testing, reliability, Ability to translate user needs into technical solutions, Experience working with ambiguous requirements and complex problems 📃 Skills: TypeScript, Node.js, React, JavaScript, MySQL, Redis, AI, REST, Git, Testing 🏢 Description: Position: Senior Software Engineer Location: Krakow, hybrid working model- 3 days per week from the office Salary: 28 000 – 33 000 PLN About the company Our client is building a modern platform that helps organizations manage compensation and effectively communicate pay, rewards, and benefits. Their products are designed to bring greater transparency, trust, and clarity to compensation decisions for both employees and candidates. The company focuses on delivering enterprise-grade solutions for large, global organizations, leveraging advanced technologies and AI-driven capabilities. Operating in a fast-paced, startup-like environment, they offer engineers strong ownership and real impact on product direction. Their platform is used by leading companies to make smarter compensation decisions and improve employee experience. Role summary In this role, you will be responsible for designing and building high-quality product experiences related to compensation communication and rewards. You will work end-to-end, from shaping requirements and technical design to implementation and post-release improvements. The position offers a high level of ownership and influence over technical direction, product quality, and engineering standards. You will play a key role in scaling the product for enterprise customers while collaborating closely with Product and Design teams. This is an opportunity to combine strong engineering skills with product thinking in a high-impact environment. Responsibilities Design and build end-to-end product features (full-stack) Develop scalable solutions for enterprise-level organizations Build AI-powered features to support compensation decision-making Contribute to system architecture and engineering best practices Collaborate closely with Product and Design on roadmap and priorities Ensure high standards of code quality, testing, and reliability Solve complex technical and product challenges Requirements 5+ years of experience building customer-facing web applications (full-stack) Strong product mindset and ability to translate user needs into technical solutions Experience with technologies such as TypeScript, Node.js, and React Ability to work in ambiguous environments and break down complex problems High standards for code quality, testing, and system reliability Strong collaboration and technical leadership skills Nice to have: Experience in HR Tech, compensation, or workforce management domains Experience building enterprise-grade B2B software (e.g., permissions, audit logs, data controls) Familiarity with MySQL and Redis Experience using AI tools to enhance productivity Interest in mentoring and supporting team growth Offer: B2B contract Hybrid working model- 3 days per week from the office High level of ownership and impact on product and technology Fast-paced, startup-like environment Opportunity to work with an experienced engineering team Competitive salary and benefits package (e.g., private healthcare, learning budget – depending on the offer)

🏢 Summary: Senior Angular Developer role focused on leading the migration of a legacy insurance platform to a modern Angular (v21) stack in a hybrid work model. The position involves designing and maintaining frontend applications, collaborating across teams, and leveraging AI-assisted development tools. The project combines legacy system modernization with modern frontend architecture and best engineering practices. 🗂️ Requirements: Minimum 5 years commercial experience in frontend development, Strong expertise in Angular, Strong expertise in TypeScript, Solid knowledge of JavaScript (ES6+), Experience with legacy systems, Experience with AngularJS, Hands-on experience with AI coding assistants, Ability to write and review code using AI tools, Strong knowledge of frontend testing (unit, integration, e2e), Experience with REST APIs, Experience with Git, Experience with CI/CD pipelines 📃 Skills: Angular, TypeScript, JavaScript, AngularJS, REST, Git, CI/CD, Angular Material, Tailwind, Bootstrap, Cursor, Copilot, Claude, AI, HTML, CSS 🏢 Description: Salary: 900 - 1200 PLN/day on B2B Work model: elastic hybrid from Cracow (2 days per week from the office) Why choose this offer? You can expect a flexible work organization The international work environment will give you the opportunity to interact with the English language on a daily basis The Jit community will bring you a nice time during regular integration meetings Exposure to AI-assisted development Project We are looking for a Senior Angular Developer to join a team working on modern web applications in the insurance domain. The primary focus of this role is leading and contributing to the migration of a legacy system to a modern technological stack (Angular 21). The application is a configurable platform used by insurance agencies, operating between SaaS and PaaS models. Development is distributed across multiple teams, each responsible for different parts of the system. The environment combines deep legacy system understanding with modern frontend practices and AI-assisted development. Responsibilities you'll have Design, develop, and maintain frontend applications using Angular and TypeScript Lead and actively contribute to the migration of legacy systems to modern Angular architecture Collaborate with cross-functional teams working on different parts of the platform Work effectively with AI-assisted development tools and agents to increase productivity Ensure high standards of code quality, testing, and maintainability Participate in technical decision-making , architecture discussions, and solution design Support and mentor junior and mid-level developers Contribute to effort estimation, planning, and delivery Expected competences and knowledge Minimum 5 years of commercial experience in frontend development Strong expertise in Angular and TypeScript Solid understanding of JavaScript fundamentals Experience working with legacy systems , including occasional exposure to AngularJS Hands-on experience with AI coding assistants (e.g., Cursor, Claude Code, Copilot) and working alongside established AI agents Ability to effectively write and review code with AI assistance , while maintaining ownership and code quality Strong understanding of frontend testing concepts and practices (unit, integration, e2e) Technologies you'll work with Angular TypeScript & modern JavaScript (ES6+) AngularJS (in legacy parts of the system) AI-assisted development tools (e.g., Cursor, Claude Code, Copilot) and preconfigured AI agents UI frameworks (Angular Material, Tailwind, Bootstrap) REST APIs Git, CI/CD pipelines Nice to have: Experience with Java (useful for backend collaboration) Previous exposure to AngularJS migration projects Experience working in SaaS or PaaS platforms About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.

🏢 Summary: B2B role for building and scaling a greenfield cloud infrastructure project, starting within an internal team and transitioning to long-term ownership with the end client. The position focuses on designing, deploying, and maintaining GCP-based infrastructure using modern DevOps and IaC practices. You will work on a high-impact system with full responsibility for platform architecture, CI/CD, networking, and monitoring. 🗂️ Requirements: Extensive experience with Google Cloud Platform and independent infrastructure design, Strong knowledge of Kubernetes and GKE, Hands-on experience with Infrastructure as Code, Experience with Terraform, Atlantis and ArgoCD, Strong understanding of networking fundamentals including DNS and TCP/IP, Experience in building and maintaining CI/CD pipelines, Experience in designing and maintaining monitoring and alerting systems 📃 Skills: GCP, Kubernetes, GKE, Terraform, Atlantis, ArgoCD, CI/CD, DNS, TCP/IP, IaC, Monitoring 🏢 Description: Location: Warsaw/Cracow (hybrid: 1-2 days per week in the office) Contract: B2B Salary: 15 000 - 23 000 PLN B2B How this role works: You will start by building the system as part of our team, working in a focused, greenfield setup. After a few months of introduction to the project, you will seamlessly continue working on the same product directly with the client , becoming part of the client’s team responsible for its long-term development and scaling. There is no handover phase and no context switching - you stay with the same codebase, product, and technical challenges, while gaining long-term ownership and impact. Why you’ll like this role: Work on a high-visibility project with real impact Collaborate with a team of experienced engineers and ML specialists Build a greenfield system with cutting-edge technologies Gain long-term ownership and influence over infrastructure and platform architecture Must have: Extensive knowledge of Google Cloud Platform (GCP) and ability to independently design, deploy, and maintain infrastructure for medium to large-scale projects Solid understanding of Kubernetes (GKE) Hands-on experience with Infrastructure as Code (IaC) - Terraform, Atlantis, ArgoCD Strong understanding of networking fundamentals , including DNS and TCP/IP Experience with creating and maintaining CI/CD pipelines Experience in designing and maintaining monitoring and alerting systems, following industry best practices Nice to have: Experience with infrastructure supporting machine learning / AI workloads Familiarity with modern application architecture - principles of designing scalable applications, implementing effective health checks, managing resources efficiently to avoid overprovisioning and underprovisioning We want to offer you: Work with an experienced team that continually shares knowledge and is not afraid of testing new solutions Flexible hours Individual work tools – Macbook Pro, Dell screen, JBL headphones? You can tailor the equipment to your needs Sport & wellness benefit (Kafeteria MyBenefit) Private medical care A comprehensive benefits package after transitioning to our partner, including employee benefits, training opportunities, and occasional bonuses