Kafka Expert (Staff/Principal)

🏢 Summary: Remote-first Scala Developer role focused on building scalable and maintainable systems using functional programming and modern JVM technologies. The offer includes flexible cooperation, strong engineering culture, and work on projects involving distributed systems, Big Data, and Blockchain. Candidates will design and develop high-quality software in small, technically driven teams. 🗂️ Requirements: Very good Scala skills, Strong functional programming knowledge, Ability to write clean and testable code, Minimum 4 years of commercial software development experience, Understanding of software architecture patterns, Ability to design scalable and maintainable systems, Knowledge of industry trends, Team collaboration skills, Very good English (spoken and written), Polish language proficiency 📃 Skills: Scala, Akka, Zio, Cats, Slick, Blockchain, Cassandra, MongoDB, Kafka, JVM 🏢 Description: Our cooperation offer: Remuneration ranging from 125 to 185 PLN net per hour for start 100% remote company with a remote-first mindset Flexible cooperation from any location and without strict schedule Professional development and freedom in choosing the toolset and tech stack Learning-culture expressed by in-house trainings, technical and soft-skills reading clubs and Architecture club Access to many AI tools (Claude, OpenAI, Cursor, Gemini, Copilot, etc.) Leadership and soft-skills in-house trainings English courses Small to medium teams with as little procedures as possible Best tools you need to make our cooperation effective and pleasurable: monitor(s), computer of your choice Dev-friendly environment with passionate and skilled people who believe in clean code and software craftsmanship - you will have a chance to meet some of them during the selection process Interesting projects with technologies like Scala, Akka, Zio, Cats, Slick, Blockchain, Cassandra, MongoDB, Apache Kafka What we expect: Very good Scala skills and functional programming knowledge Ability to write clean and testable code At least 4 years of commercial experience in developing software Understanding of different types of software architecture Ability to design with scalability and maintainability in mind Comprehensive knowledge and understanding of the industry trends Team collaboration ability Good knowledge of English is a must (both spoken and written), we cooperate with clients from all over the world (USA, Australia, Switzerland, etc.) Polish language is required, as internally we are a Polish speaking company Nice to have: Actor model and Akka / Pekko Knowledge of a second JVM language Experience in using AI in software development and deployment cycle Engagement in the IT community: personal blog, speaking at meetups/conferences, involvement in the open-source projects Having a pet-project Interest in Big Data, Machine Learning and/or Blockchain

🏢 Summary: Remote position for an experienced full‑stack developer responsible for building new APIs, maintaining and upgrading backend and frontend applications, and improving product quality. The role involves bug fixing and continuous enhancement of existing systems using modern Java and JavaScript technologies. Salary depends on experience (3+ years). 🗂️ Requirements: Minimum 3 years of experience with Java, Minimum 3 years of experience with AWS, Minimum 3 years of experience with MongoDB, Minimum 3 years of experience with PostgreSQL, Minimum 3 years of experience with React.js, Minimum 3 years of experience with Spring Boot 📃 Skills: Java, AWS, MongoDB, PostgreSQL, React, SpringBoot, APIs 🏢 Description: Location: 100% remote Salary: 105–175 PLN net/h ( depending on experience, we are looking for candidates with 3 to +8 years of experience ) Tasks Development of new APIs to support clients Fixing bugs Upgrading and maintaining backend and frontend applications Looking for opportunities to improve the product Requirements Java – minimum 3 years of experience AWS – minimum 3 years of experience MongoDB – minimum 3 years of experience PostgreSQL – minimum 3 years of experience React.js – minimum 3 years of experience Spring Boot – minimum 3 years of experience Offer Multisport card Private healthcare Access to an e‑learning platform Group life insurance

🏢 Summary: Senior Software Engineer role focused on building a real-time AI platform, owning features end-to-end across frontend, backend, and cloud infrastructure. The position involves developing full-stack solutions and contributing to technical architecture in a remote-first startup environment. 🗂️ Requirements: Strong experience with TypeScript, Strong experience with React, Hands-on experience with AWS, Experience with Docker, Experience with Linux, Experience with Git, Fluent English 📃 Skills: TypeScript, React, AWS, Docker, Linux, Git, Express, Tailwind, WebSockets, LangChain 🏢 Description: 💰 Salary: 25 000 – 28 000 PLN net/month (B2B) + 26 days paid annual leave + equity (ESOP) 📍 Location: Remote (Poland) + meetup in Poznań once per month Our client is an early-stage startup building a real-time AI platform that supports professionals during live conversations. The system processes interactions in real time and delivers contextual insights, knowledge, and guidance while conversations are happening. The founding team has strong experience in distributed systems, AI platforms, and enterprise SaaS and is currently expanding the engineering team to accelerate product development. Role The client is looking for a Senior Software Engineer who enjoys owning features end-to-end, from frontend interfaces to backend services and cloud infrastructure. You will work closely with the founding team on building a real-time AI-powered product , contributing to both product development and technical architecture. Responsibilities Build full-stack features using TypeScript Develop React-based user interfaces Design and maintain backend services and APIs Work with AWS cloud infrastructure Build and run Docker-based services Improve performance and reliability of real-time systems Requirements Strong experience with TypeScript and React Hands-on experience with AWS Experience with Docker and Linux Comfortable working with Git workflows Fluent English Experience working in remote teams Nice to Have Express Tailwind CSS Experience with real-time systems Knowledge of WebSockets / streaming Experience with LLM frameworks (e.g. LangChain) What the Client Offers Opportunity to build a product from an early stage Direct influence on architecture and product direction Work with experienced founders Remote-first environment Competitive salary + equity High level of ownership and autonomy

🏢 Summary: Opportunity for experienced Fullstack Consultants to join a flexible freelance network supporting international projects in areas such as greenfield development, MVPs, modernization, and consulting engagements. The role focuses on end-to-end solution delivery using Java and Kotlin, with cooperation models adjusted to project needs and consultant availability. 🗂️ Requirements: Strong experience building end-to-end backend and frontend solutions, Commercial experience with Java, Commercial experience with Kotlin, Ability to independently deliver technical solutions, Ability to collaborate with technical and business stakeholders, Experience with architecture design and production-ready implementation, Ability to estimate implementation scope and effort, Focus on software quality and maintainability, Practical use of AI tools 📃 Skills: Java, Kotlin, Fullstack, Backend, Frontend, Architecture, AI 🏢 Description: We are building a verified network of experienced freelancers and consultants who can support our clients in flexible cooperation models: from short-term delivery acceleration and MVP initiatives to outcome-based consulting engagements. This is not a traditional recruitment process. We are looking for experienced Fullstack Consultants interested in becoming part of network and open to future collaboration opportunities adjusted to project needs, availability and specialization fit. Remuneration depends on the type of assignment. For hourly rates, our range usually included rates up to 190 PLN net + VAT. What kind of projects may you support? Depending on business demand and your availability, potential engagements may include: - greenfield product development - feature acceleration initiatives - modernization projects - MVP and rapid prototyping work - delivery reinforcement for existing engineering teams - consulting and outcome-based delivery projects - short-term high-impact initiatives Examples of what you could do You should be capable of: - independently delivering end-to-end technical solutions - collaborating directly with technical and business stakeholders - structuring implementation scope and estimating effort - balancing engineering quality with pragmatic delivery decisions What would we expect? - strong experience building end-to-end solutions across backend and frontend (from architecture design to implementation and production readiness) - strong commercial experience with Java and Kotlin - focus on software quality, maintainability and real business impact - active and pragmatic use of AI tools No detailed tech stack? That's intentional. We work with companies facing different challenges, so we're always open to professionals with unique combinations of skills and experience. This time we are especially open to applications from people specializing in Java and Kotlin. Important! - joining the network does not guarantee immediate project allocation - potential engagements may vary in duration, scope and workload - part-time, full-time and short-term cooperation models are possible By joining the network, you may gain: - access to international projects and consulting initiatives, including collaborations with Scandinavian clients - opportunities adjusted to your availability, preferred engagement model and technical strengths - long-term relationship instead of one-off transactional recruiting processes We want to build a high-quality network of experienced consultants we know, trust and can match with the right opportunities over time.

🏢 Summary: Full Stack Developer role in the automotive industry focused on building and maintaining web applications using modern Java and JavaScript technologies. The project involves developing Angular-based frontends and Spring Boot backends deployed on AWS, with long-term remote collaboration. Full-time B2B engagement with English-speaking client and regular team interactions. 🗂️ Requirements: 5+ years of software development experience, Proficiency in Java, Proficiency in JavaScript, Proficiency in TypeScript, Experience with Spring Boot (Boot, Data, Security), Experience with Angular, Experience with HTML/CSS, Experience with SQL databases, Experience with NoSQL databases, Experience with Hibernate or JPA, Experience with AWS (ECS, EKS, Lambda, CloudWatch), Ability to write unit tests using JUnit 📃 Skills: Java, JavaScript, TypeScript, Angular, HTML, CSS, Spring, SpringBoot, Hibernate, JPA, SQL, NoSQL, AWS, ECS, EKS, Lambda, CloudWatch, JUnit 🏢 Description: 🌍 Remote work: remote (occasional meetings in the Warsaw office; may happen every 2 weeks, with client workshops every 3 months). 💰 Rate: B2B – up to 145 zl/h. 📕 Project language: English. ⏳ Project length: > 12 months + prolongations. ⏰ Start: ASAP / 2 weeks. 💻 Equipment : work on own equipment. 💬 Workload: full time, fixed-price contract : including 30 paid days off (approx. 18.5 working days/month). ⚙️ Recruitment process : 1 interview with the client. 💼 Industry : Automotive. Summary: This role focuses on developing and maintaining robust full stack applications for the PAAK team, primarily using a range of modern web technologies and frameworks . Main Responsibilities: Develop and maintain full stack applications using Java, JavaScript, and TypeScript . Implement web front-ends using Angular and HTML/CSS . Design and manage back-end services with Spring Boot , including integration with databases. Utilize AWS cloud services for deployment and monitoring. Write unit tests and maintain code quality using JUnit. Participate in regular team meetings and client interactions . Key Requirements: 5+ years of experience in software development. Proficiency in Java and JavaScript/TypeScript. Experience with Spring Boot and its ecosystem (Boot, Data, Security). Familiarity with both SQL and NoSQL databases using Hibernate or JPA . Experience using AWS services (ECS/EKS, Lambda, CloudWatch). Nice to Have: Knowledge of CI/CD practices, especially using GitHub Actions . Familiarity with design patterns such as Saga . Experience with container orchestration tools. Other Details: Location: Warsaw Work Schedule: Full time with a specification of 18.5 days work on service order requiring holidays during assignment. Team Interaction: Consultants’ teams meet every 2 weeks; client visits every 3 months. Remote Work: BYOD policy, no travel required.

🏢 Summary: Opportunity for experienced Fullstack Consultants to join a verified freelance network supporting diverse projects such as greenfield development, MVPs, modernization, and consulting engagements. Collaboration is flexible (short-term, part-time, full-time) and project-based, depending on business needs and availability. Consultants are expected to independently deliver end-to-end solutions and support clients in outcome-driven initiatives. 🗂️ Requirements: Experience delivering end-to-end backend and frontend solutions, Ability to design software architecture and drive implementation to production, Experience estimating scope, timelines and engagement level, Ability to independently structure implementation work, Experience collaborating with technical and business stakeholders, Focus on software quality and maintainability, Active practical use of AI tools 📃 Skills: Backend, Frontend, Architecture, Estimation, AI, Prototyping, MVP, Consulting, Modernization, Delivery 🏢 Description: We are building a verified network of experienced freelancers and consultants who can support our clients in flexible cooperation models: from short-term delivery acceleration and MVP initiatives to outcome-based consulting engagements. This is not a traditional recruitment process. We are looking for experienced Fullstack Consultants interested in becoming part of network and open to future collaboration opportunities adjusted to project needs, availability and specialization fit. Remuneration depends on the type of assignment. For hourly rates, our range is 150-190 PLN net + VAT. What kind of projects may you support? Depending on business demand and your availability, potential engagements may include: greenfield product development, feature acceleration initiatives, modernization projects, MVP and rapid prototyping work, delivery reinforcement for existing engineering teams, consulting and outcome-based delivery projects, short-term high-impact initiatives. Examples of what you could do 👇 You should be capable of: independently delivering end-to-end technical solutions, collaborating directly with technical and business stakeholders, structuring implementation scope and estimating effort, balancing engineering quality with pragmatic delivery decisions. What would we expect? experience estimating implementation scope, delivery timelines and required level of engagement based on business needs, strong experience building end-to-end solutions across backend and frontend (from architecture design to implementation and production readiness), focus on software quality, maintainability and real business impact, active and pragmatic use of AI tools. No specific tech stack? That's intentional. We work with companies facing different challenges, so we're always open to professionals with unique combinations of skills and experience. If you can create value through technology, we'd love to hear from you. Important! joining the network does not guarantee immediate project allocation, potential engagements may vary in duration, scope and workload, part-time, full-time and short-term cooperation models are possible. By joining the network, you may gain: access to international projects and consulting initiatives, including collaborations with Scandinavian clients, opportunities adjusted to your availability, preferred engagement model and technical strengths, long-term relationship instead of one-off transactional recruiting processes. We want to build a high-quality network of experienced consultants we know, trust and can match with the right opportunities over time. Sounds like a fit? Let’s talk! 🚀

🏢 Summary: Opportunity for experienced Fullstack Consultants to join a flexible collaboration network supporting diverse client projects such as greenfield development, MVPs, modernization, and delivery acceleration. Engagements vary in scope and duration, focusing on end-to-end solution delivery and outcome-based consulting. Compensation is assignment-based with hourly rates in the 150–190 PLN net + VAT range. 🗂️ Requirements: Proven experience delivering end-to-end backend and frontend solutions, Ability to design architecture and deliver production-ready systems, Experience estimating scope, timelines, and level of engagement, Capability to independently structure and implement technical solutions, Experience collaborating with technical and business stakeholders, Strong focus on software quality and maintainability, Practical use of AI tools in development work 📃 Skills: Backend, Frontend, Architecture, APIs, Databases, Testing, DevOps, Git, AI, Estimation 🏢 Description: We are building a verified network of experienced freelancers and consultants who can support our clients in flexible cooperation models: from short-term delivery acceleration and MVP initiatives to outcome-based consulting engagements. This is not a traditional recruitment process. We are looking for experienced Fullstack Consultants interested in becoming part of network and open to future collaboration opportunities adjusted to project needs, availability and specialization fit. Remuneration depends on the type of assignment. For hourly rates, our range is 150-190 PLN net + VAT. What kind of projects may you support? Depending on business demand and your availability, potential engagements may include: greenfield product development, feature acceleration initiatives, modernization projects, MVP and rapid prototyping work, delivery reinforcement for existing engineering teams, consulting and outcome-based delivery projects, short-term high-impact initiatives. Examples of what you could do 👇 You should be capable of: independently delivering end-to-end technical solutions, collaborating directly with technical and business stakeholders, structuring implementation scope and estimating effort, balancing engineering quality with pragmatic delivery decisions. What would we expect? experience estimating implementation scope, delivery timelines and required level of engagement based on business needs, strong experience building end-to-end solutions across backend and frontend (from architecture design to implementation and production readiness), focus on software quality, maintainability and real business impact, active and pragmatic use of AI tools. No specific tech stack? That's intentional. We work with companies facing different challenges, so we're always open to professionals with unique combinations of skills and experience. If you can create value through technology, we'd love to hear from you. Important! joining the network does not guarantee immediate project allocation, potential engagements may vary in duration, scope and workload, part-time, full-time and short-term cooperation models are possible. By joining the network, you may gain: access to international projects and consulting initiatives, including collaborations with Scandinavian clients, opportunities adjusted to your availability, preferred engagement model and technical strengths, long-term relationship instead of one-off transactional recruiting processes. We want to build a high-quality network of experienced consultants we know, trust and can match with the right opportunities over time. Sounds like a fit? Let’s talk! 🚀

🏢 Summary: Senior Software Engineer role focused on backend development for an established SaaS platform using Scala and Python, with expansion of AI-powered features and integrations. The project involves building scalable backend services, integrating AI/LLM solutions, and supporting production-grade architecture and CI/CD workflows in a remote EU-based B2B engagement. 🗂️ Requirements: 7+ years of professional software development experience, Strong production experience with Scala, Strong proficiency in Python, Experience developing production-grade backend applications, Hands-on experience building and maintaining backend services, Ability to work across Scala and Python codebases, Experience with automated testing, Experience with version control, Experience with code reviews, Experience with CI/CD, Understanding of scalable and maintainable software architecture, Ability to independently solve technical problems, Strong communication skills, Fluency in Polish, Advanced English level (B2/C1) 📃 Skills: Scala, Python, REST, CI/CD, Testing, APIs, SaaS, LLM, ElasticSearch, AWS, Azure, GCP, PHP 🏢 Description: Contract: B2B Rate: 150-160 zł/h net + VAT depending on skills and experience Location: Remote within the EU Duration: 6+ months, with the possibility of long-term cooperation Start: ASAP Project: Backend engineering project focused on developing and maintaining a SaaS platform and expanding its AI-powered capabilities. Key Technologies/Areas Scala Python Backend development REST APIs SaaS platforms CI/CD Automated testing Nice to have: AI and LLM integrations, ElasticSearch, AWS, Azure, or GCP Project Overview You’ll join an existing engineering team as a Senior Software Engineer , contributing to the development and maintenance of backend services for an established SaaS platform. The role combines Scala and Python development . Scala is a core technology used within the existing platform, while a significant part of the day-to-day development will be carried out in Python. You will also support the expansion of AI-powered functionality across the product, including integrations with internal and external AI services, LLM platforms, transcription solutions, and other machine-learning-based capabilities. This is a hands-on role for an experienced backend engineer who can work independently, contribute to architectural and technical decisions, and build reliable, scalable, production-ready solutions. Responsibilities Develop, maintain, and extend backend services using Scala and Python. Design and implement scalable functionality across an existing SaaS platform. Build and expand AI-powered features within the product. Integrate internal and external AI services through APIs, including LLM-based platforms and similar tools. Support the maintenance and further development of existing Scala-based services. Develop new backend functionality primarily in Python. Design reliable and maintainable integrations between platform services and external systems. Write clean, testable, and well-documented production code. Participate in technical discussions, code reviews, and architectural decisions. Ensure the quality, scalability, performance, and security of implemented solutions. Work closely with software engineers, product teams, and other technical stakeholders. Support CI/CD processes and modern software development workflows. Troubleshoot production issues and improve the stability of existing services. Requirements At least 7 years of professional software development experience. Strong production experience with Scala . Strong proficiency in Python and experience developing production-grade backend applications. Hands-on experience building and maintaining backend services. Ability to work effectively across both Scala and Python codebases. Strong understanding of software engineering best practices. Experience with automated testing, version control, code reviews, and CI/CD. Good understanding of scalable and maintainable software architecture. Ability to independently analyze technical problems and propose practical solutions. Strong communication skills and the ability to collaborate within an international engineering team. Fluency in Polish and an advanced level of English (B2/C1) Nice to have Commercial experience working with LLMs or generative AI solutions . Experience integrating AI services or AI models into production systems. Experience building integrations with external AI platforms through APIs. Experience with AI-based transcription, speech-to-text, or related technologies. Experience with ElasticSearch . Experience with public cloud AI services available in AWS, Azure, or GCP. Experience developing or maintaining PHP applications. Previous experience working on SaaS products. Understanding of AI service scalability, monitoring, performance, and cost optimisation. Why join us? Rite NRG is a vibrant outsourcing technology company driven by the Right People. We are dedicated to empowering businesses through innovative software solutions. We focus on building strong partnerships and providing top-notch software solutions that drive real business growth. Our business model revolves around collaboration and delivering impactful results for our clients. Join us and be part of a team where great minds, Right Energy, and strong partnerships come together to shape the future of technology! Stable, long-term, full-time collaboration. Remote work within the EU and flexible working hours. High engineering culture with a focus on growth and learning. Opportunity to work on a mature SaaS platform and production AI solutions. Multinational teams. Benefits: Private medical care, Multisport card, and workation opportunities.

🏢 Summary: Backend-focused contract role to develop and maintain high-performance, reliable systems with strong cloud and containerization practices. The position involves close collaboration with frontend teams to ensure seamless data integration and efficient deployment on AWS. Initial 6-month B2B contract with remote work and periodic travel. 🗂️ Requirements: Proficiency in Python, Experience with backend frameworks, Experience with Pandas, Knowledge of Docker, Knowledge of Kubernetes, Hands-on experience with AWS services (Lambda, EC2, ECS, EKS), Basic knowledge of Terraform, English level B2+ 📃 Skills: Python, Pandas, Docker, Kubernetes, AWS, Lambda, EC2, ECS, EKS, Terraform, Temporal, Camunda, StepFunctions, Pymocks 🏢 Description: Project Information: Start : ASAP Rate : up to 200 PLN/h Type of contract : B2B Length of the project : first contract for 6 months Location : remote Business travels : one trip to Frankfurt per 3 months Languages : English on minimum B2+ level; German - nice to have Summary: This role focuses on developing and maintaining robust backend systems to ensure high performance and reliability while collaborating closely with frontend teams for seamless data integration. Main Responsibilities: Develop and maintain backend systems with a focus on performance and reliability. Collaborate closely with frontend teams to ensure smooth data flow and integration. Build and manage containerized applications using tools like Docker and Kubernetes. Utilize cloud services, particularly AWS, to deploy and operate applications efficiently. Key Requirements: Proficiency in a general-purpose programming language, preferably Python. Experience with backend and data-science frameworks, specifically Pandas. Solid understanding of containerization technologies, including Docker and Kubernetes. Hands-on experience with AWS cloud services like Lambda, EC2, ECS, and EKS. Basic knowledge of Terraform. Nice to Have: Knowledge of business process modeling or workflow orchestration tools such as Temporal, Camunda, or AWS Step Functions. Experience working with mocking frameworks like pymocks.

🏢 Summary: Backend development role focused on building and maintaining high-performance, reliable systems in a cloud environment. The position involves close collaboration with frontend teams and deploying containerized applications using AWS infrastructure. The project is remote with a long-term B2B contract and immediate start. 🗂️ Requirements: Proficiency in Python, Experience with backend development, Experience with Pandas, Strong knowledge of Docker, Strong knowledge of Kubernetes, Hands-on experience with AWS services (Lambda, EC2, ECS, EKS), Basic knowledge of Terraform 📃 Skills: Python, Pandas, Docker, Kubernetes, AWS, Lambda, EC2, ECS, EKS, Terraform 🏢 Description: Project Information: Start : ASAP Rate : up to 200 PLN/h Type of contract : B2B Length of the project : first contract for 6 months Location : remote Business travels : one trip to Frankfurt per 3 months Languages : both German and English on minimum B2+ level Summary: This role focuses on developing and maintaining robust backend systems to ensure high performance and reliability while collaborating closely with frontend teams for seamless data integration. Main Responsibilities: Develop and maintain backend systems with a focus on performance and reliability. Collaborate closely with frontend teams to ensure smooth data flow and integration. Build and manage containerized applications using tools like Docker and Kubernetes. Utilize cloud services, particularly AWS, to deploy and operate applications efficiently. Key Requirements: Proficiency in a general-purpose programming language, preferably Python. Experience with backend and data-science frameworks, specifically Pandas. Solid understanding of containerization technologies, including Docker and Kubernetes. Hands-on experience with AWS cloud services like Lambda, EC2, ECS, and EKS. Basic knowledge of Terraform. Nice to Have: Knowledge of business process modeling or workflow orchestration tools such as Temporal, Camunda, or AWS Step Functions. Experience working with mocking frameworks like pymocks.