Senior/Lead .NET Developer

🏢 Summary: Senior software engineering role focused on developing high-performance, real-time solutions for power grid automation using modern C++ and cross-platform technologies. The position involves designing scalable and secure systems, optimizing low-latency applications, and contributing to mission-critical energy infrastructure projects in an international agile environment. Hybrid work from Kraków with long-term product development and collaboration across global R&D teams. 🗂️ Requirements: University degree in computer science, engineering, or related field, 8+ years of experience in senior technical roles, Advanced C++17/20 knowledge, Experience with multithreading and synchronization, Experience with asynchronous I/O and real-time systems, Cross-platform development for Windows and Linux, Knowledge of CMake and Visual Studio, Experience with Docker and Kubernetes, Experience with microservices architecture, Performance profiling and optimization experience, Knowledge of software architecture and secure system design, Understanding of unit and integration testing, Knowledge of scalability, performance, and security requirements, Experience with power grid management systems, Knowledge of SCADA, IED, and RTU systems 📃 Skills: C++, C#, .NET, Rust, CMake, VisualStudio, Windows, Linux, Docker, Kubernetes, Microservices, SCADA, IED, RTU, STL, RAII, Agile 🏢 Description: Salary: 1100-1400 pln/md on B2B Remote: hybrid from Kraków (1-2 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 Work on cutting-edge technologies supporting the global energy transition Collaborate with international teams and industry experts Project The project is part of the Grid Automation domain, focused on developing innovative solutions for the power systems of the future. The team is responsible for designing and building high-performance, secure, and reliable software applications using modern C++ (C++17/20) , with a strong emphasis on real-time operation, system resilience, and long-term product support. As part of this initiative, engineers develop mission-critical software that supports energy infrastructure worldwide. The solutions are designed to meet demanding requirements for reliability, efficiency, cybersecurity, and continuous operation in real-time environments. The role offers close collaboration with global R&D and technology teams, bringing together specialized expertise and advanced engineering capabilities. Team members have a direct impact on the development of next-generation products that help ensure the stability, safety, and modernization of critical power systems. This is an opportunity to work on complex, cutting-edge technologies while contributing to software that delivers long-term value and supports essential infrastructure on a global scale. Responsibilities you'll have Develop system design in areas like multithreading, synchronization, I/O, and latency requirements for real-time operation Develop high-performance C++ cores to managed runtime services (.NET, RUST) with minimal latency overhead Implement performance optimization and scalability : profile threading behavior, minimizing lock contention, reducing memory allocations in critical paths, and ensure predictable latency at scale Maintain high code quality through code reviews, unit testing, and adherence to SOLID, KISS, DRY and industry best practices Participate in system design, best practices and maintaining code quality in performance-critical sections Participate in technical architecture reviews, design documentation, and roadmaps for feature development, refactoring initiatives, and legacy code modernization, collaborate with engineering, product, and business stakeholders to transform requirements into clear architectural designs Support strategic technology decisions on dependencies, build tooling, dependency management, and secure software supply chain practices, maintain cross-platform support: drive modernization of build systems, ensure consistency across multiple deployment environments, and support Linux/Windows compatibility Practical Linux development and deployment strategies Contribute to achieving business goals by designing, developing, and delivering high-quality software solutions Continuously enhance existing systems and contribute to the creation of new features Work effectively within an agile environment, continually expanding your technical expertise and understanding of the business domain, actively participate in a cross-disciplinary team and contribute to shared objectives Expected competences and knowledge University degree in computer science, engineering, or a related technical field 8+ years of experience in senior technical roles Advanced proficiency in modern C++ (C++17/20) with deep understanding of RAII, smart pointers, STL, concurrency, and memory management Practical knowledge of C# development in plus Strong experience with multithreading, synchronization primitives, asynchronous I/O and real-time system design Proficiency with building systems (CMake, Visual Studio) and cross-platform development for Windows and Linux Experience with containerization technologies (Docker, Kubernetes) and microservices architecture patterns Demonstrated experience with performance profiling, optimization, and low-latency systems Understanding of software architecture principles and secure, scalable system design Excellent problem-solving skills and the ability to tackle complex technical challenges Good understanding of unit and integration testing techniques and testing frameworks Knowledge of non-functional requirements (performance, scalability, security) Practical experience developing systems for power grid management and monitoring Understanding of power grid operations and applicable standards Experience with industrial automation systems (SCADA, IED, RTU) Technologies you'll work with C++ 17/20 RAII, smart pointers, STL C# .NET, RUST CMake, Visual Studio Windows, Linux Docker, Kubernetes Microservices SCADA, IED SOLID, KISS, DRY Agile Client – why choose this particular client from the Jit portfolio? Our Client is an established global technology leader driving the digital transformation and innovation required to accelerate the transition toward a carbon-neutral future . Serving customers across the utility, industry, and infrastructure sectors, they provide cutting-edge solutions and services across the entire energy value chain. The organization is actively evolving the worlds energy systems to make them more sustainable, flexible, and secure, while precisely balancing social, environmental, and economic value. With a proven track record and an unparalleled installed technological base spanning well over 100 countries, the company operates on a massive global scale. 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: Senior/Expert Java Developer role in an international SaaS project focused on building new AI-driven functionality and modernizing backend systems. The position involves technical ownership, architecture design, and development of scalable microservices-based solutions in a hybrid work model. Candidates will work with Java, Spring Boot, AI technologies, and Microsoft Foundry in a dynamic consultancy environment. 🗂️ Requirements: 8+ years of experience as a Java Developer, Strong knowledge of Java stack, Experience with CI/CD, Experience with Docker, Experience with microservices, Experience building end-to-end solutions, Commercial experience with AI tools, Experience with Microsoft Foundry, Ability to design scalable and maintainable systems, Experience in software house or consultancy environment, Strong understanding of backend architectures, Knowledge of backend development best practices, Strong technical skills, Strong communication skills, Ability to work on multiple projects simultaneously 📃 Skills: Java, Spring, SpringBoot, SQL, Docker, Microservices, CICD, MicrosoftFoundry, AI, Cloud 🏢 Description: Salary: Senior 1000–1300 PLN net / MD Expert/Leader 1300-1600 PLN net / MD (if your financial expectations are higher and justified by your experience, please let us know - we are open to discussing it) Work model: Kraków / Gdańsk  / Warsaw - hybrid work model (2 days per week from the office) Start date: As soon as possible. We can wait up to 1 month if required due to a notice period. Why choose this offer? Real influence on technical decisions and system architecture Dynamic, project-driven environment with diverse challenges Developing new AI-based functionality Project International project focused on building new AI-driven functionality within a modern SaaS platform. This role offers the opportunity to take technical ownership, shape architecture decisions, and contribute to the development of innovative solutions leveraging modern AI technologies, including Microsoft Foundry . Responsibilities you'll have Take technical ownership of the project Design and architect end-to-end backend systems and solutions Supervise and ensure technical quality across projects Support project estimations, including effort, budget, and cost calculations Create and maintain technical designs and documentation Collaborate closely with delivery and business stakeholders Adapt to different client environments, expectations, and technical stacks Work on several projects simultaneously — multitasking is essential Expected competences and knowledge 8+ years of experience as a Java Developer Solid knowledge of the Java stack Solid familiarity with CI/CD , experience working with Docker and microservices Experience in building end-to-end solutions Commercial experience with AI tools Experience with Microsoft Foundry Strong technical and soft skills Proven ability to design scalable and maintainable systems Experience working in a software house / consultancy environment Very good understanding of backend architectures and development best practices Nice to have Experience with cloud platforms (from a developer perspective) Knowledge of modern infrastructure and deployment approaches Technologies you'll work with Java Spring Boot SQL Microsoft Foundry Docker Microservices CI/CD Cloud platforms Client – why choose this particular client from the Jit portfolio? Our client is a leading European SaaS provider specializing in cloud-based solutions for the insurance and pension sector. The cooperation focuses on platform modernization and the development of new AI-based functionality , combining modern technologies with real business impact. 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: Junior-level role in a project building a high-performance, scalable messaging platform for financial institutions, focused on message transport, transformation, routing, and monitoring in a critical environment. The position offers hands-on experience with enterprise financial systems and development toward Java backend or DevOps paths. Work is in a hybrid model with on-call support in a time-sensitive setup. 🗂️ Requirements: Basic experience in Java, Interest in DevOps, Good command of English (spoken and written), Availability for on-call support (rotational shifts), Ability to work in time-sensitive environments, Problem-solving skills, Willingness to work on-site 2 days per week 📃 Skills: Java, Spring, SpringBoot, Kubernetes, OpenShift, Docker, ActiveMQ, IBMMQ, Elasticsearch, PostgreSQL, DB2, ArgoCD, GitOps, Incentage 🏢 Description: Salary: 252 - 350 PLN/ day net + vat (B2B/Civil contract) Remote: elastic hybrid from our office in Gdynia/Gdańsk (2 days per week on-site) Why choose this offer? International working environment High level of autonomy and collaboration within the team Scandinavian organizational culture supporting real work-life balance Opportunity to learn how financial products and markets operate Project You’ll join a project focused on building a robust, scalable, high-performance messaging platform for financial institutions. The system handles message transport, data transformation, routing, validation, sequencing, and monitoring. It’s a critical, high-throughput environment where reliability matters and attention to detail makes a real impact. Expected competences and knowledge Junior level with strong learning mindset): Basic experience in Java (commercial or solid personal projects) Interest in DevOps, with an eagerness to learn Good command of spoken and written English Problem-solving mindset and ability to react quickly to issues Responsibility and readiness to work in time-sensitive environments Openness to collaboration and knowledge sharing (tech + business teams) Availability for on-call support (morning/evening shifts on rotation) Nice to have: Spring Boot Kubernetes / OpenShift Docker Messaging systems (Apache ActiveMQ, IBM MQ) Elasticsearch Databases (PostgreSQL, DB2) GitOps (ArgoCD) Experience with low-code platforms (e.g., Incentage IMS) What you gain: Exposure to real-world, large-scale financial systems Fast learning curve in a complex enterprise environment Supportive team that helps you grow (no “figure it out alone” culture) Development path toward Java backend / DevOps / Site Reliability Engineer Technologies you'll work with Spring Boot Kubernetes / OpenShift Docker Messaging systems (Apache ActiveMQ, IBM MQ) Elasticsearch Databases (PostgreSQL, DB2) GitOps (ArgoCD) Low-code platforms (e.g., Incentage IMS) Client – why choose this particular client from the Jit portfolio? Jit Team is proud to partner with one of the leading European financial groups responsible for the registration, ownership records, and financial settlement of securities traded on financial markets in Norway and recently extended to other European markets. Jit Team has been a strategic partner to our client in the area of software development since 2017 . Over the course of the partnership, Jit Team's dedicated team working for our client has grown from three to over 30 people , who have worked on the modernization of legacy applications, the implementation of new systems, and the development of a private cloud-based platform to host a variety of financial systems . 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 .NET Developer role on a remote or flexible-hybrid contract, building cloud-native, data-intensive platforms for intelligent heating and hot-water management. The work focuses on event-driven services, scalable analytics, distributed event processing, cloud infrastructure, and user-facing applications for sustainable energy solutions. 🗂️ Requirements: 5+ years of commercial C#/.NET experience, Kubernetes experience, Basic Azure knowledge, Python experience, PostgreSQL experience, Event-driven architecture experience, Asynchronous messaging systems experience, English proficiency at B2 level or higher, Ability to work independently, Ability to work in a cross-functional engineering team 📃 Skills: C#, NET, Kubernetes, Azure, Python, PostgreSQL, Kafka, Iceberg, GreptimeDB, React, TypeScript, SpiceDB, ReBAC, ETL 🏢 Description: Salary: 1250–1500 PLN/MD + VAT Remote: 100% remote or flexible hybrid from Gdańsk, Kraków, or Warszawa Why choose this offer? - Develop and improve a software tool that provides customers worldwide with tailor-made heating and cooling solutions. - Help create more sustainable, cost-efficient, and environmentally friendly heating and cooling solutions. - Participate in regular integration meetings. Project We are looking for an experienced Senior .NET Developer to join a team developing modern software solutions for the energy and smart building industry, focused on intelligent heating and hot-water management systems. You will join a team building modern, data-intensive, cloud-native software platforms focused on scalable analytics, distributed event processing, and real-time operational insights. You will work closely with backend, frontend, and platform engineers to design and develop event-driven services, cloud infrastructure, and user-facing applications. Expected competences and knowledge - Strong C#/.NET experience, including at least 5 years of commercial experience. - Hands-on Kubernetes experience and basic Azure cloud knowledge. - Practical Python experience. - Strong practical PostgreSQL experience. - Experience with event-driven architecture and asynchronous messaging systems. - English proficiency at a minimum B2 level. - Ability to work independently and as part of a cross-functional engineering team. Nice to have - Experience with migration and platform transformation projects. - React and TypeScript skills. - Python skills focused on data engineering, analytics, ETL, and data processing. - Hands-on Kafka experience. - Experience with modern data platform ecosystems. - Experience designing and developing cloud-native architectures. Technologies you'll work with - C#/.NET - Python - Apache Kafka - Apache Iceberg - PostgreSQL - GreptimeDB / time-series databases - React - TypeScript - Kubernetes - Azure Cloud - SpiceDB / ReBAC - Event-driven microservices architecture

🏢 Summary: Backend Developer role focused on maintaining and enhancing an existing Java-based system, ensuring stability and working with a legacy codebase in an Agile environment. The position involves designing backend services, developing REST APIs, and supporting ongoing system maintenance. Hybrid work model with collaboration in international teams. 🗂️ Requirements: Experience with Java 7/8, Experience with Maven, Experience designing backend services, Experience developing REST APIs, Ability to write unit tests, Experience working with legacy codebase, Experience working in Agile environment, Fluency in English, Experience with version control systems 📃 Skills: Java, Maven, JSP, Git, REST, Agile, UnitTesting 🏢 Description: Salary: 1000-1200 PLN/day on B2B Work model: hybrid from Gdańsk / Warszawa / Łódź (2/3 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 Scandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit) The Jit community will bring you a nice time during regular integration meetings Project You will join a team working on an existing system that requires ongoing maintenance and support . The current focus is on ensuring system stability, maintaining functionality, and working with a legacy codebase. Work is carried out in an Agile environment, with a strong emphasis on collaboration and code quality. Responsibilities you'll have Designing and implementing backend services based on given specifications Developing and maintaining REST APIs Writing and maintaining unit tests Working with and analyzing legacy codebase Contributing to the ongoing maintenance and stability of the existing system Collaborating in an Agile environment Using version control and supporting development workflows Expected competences and knowledge Experience with Java 7/8 Experience with Maven Experience in designing and implementing backend services Experience in writing REST APIs Willingness to work with and analyze legacy systems Experience working in an Agile environment Good communication skills Fluency in English Technologies you'll work with Java 7/8 Maven JSP Git REST APIs Client – why choose this particular client from the Jit portfolio? Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client's premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer's work atmosphere is epitomized by the Scandinavian culture , which is conducive to people who place emphasis on work-life balance and feedback culture . Furthermore, all projects are executed in international teams, giving constant exposure to the English language. 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: Senior .NET Developer role focused on building cloud-native, data-intensive platforms for intelligent heating and energy management systems. The position involves developing scalable event-driven services, real-time analytics solutions, and distributed systems in a modern cloud environment. You will collaborate with cross-functional teams to design and deliver robust backend and cloud infrastructure components. 🗂️ Requirements: Minimum 5 years commercial experience with C# and .NET, Hands-on experience with Kubernetes, Basic knowledge of Azure cloud, Strong practical experience with PostgreSQL, Experience with event-driven architecture, Experience with asynchronous messaging systems, English proficiency at B2 level or higher, Ability to work independently and in cross-functional teams 📃 Skills: C#, .NET, Kubernetes, Azure, PostgreSQL, Kafka, Python, React, TypeScript, Iceberg, GreptimeDB, SpiceDB 🏢 Description: Salary: 1000 - 1500 PLN/MD + VAT Remote: flexible hybrid from Gdynia / Kraków / Warszawa / Rzeszów Why choose this offer? You will have the opportunity to develop and improve a software tool which helps provide customers all over the world with tailor-made heating and cooling solutions Your work will help create more sustainable, cost-efficient and environment friendly heating and cooling solutions The Jit community will bring you a nice time during regular integration meetings Project We are looking for experienced Senior .Net Developer who will be part of a team developing modern software solutions for the energy and smart building industry, focused on intelligent heating and hot water management systems. You will join a team building modern data-intensive and cloud-native software platforms focused on scalable analytics, distributed event processing, and real-time operational insights. You’ll work closely with backend, frontend, and platform engineers to design and develop event-driven services, cloud infrastructure, and user-facing applications. Expected competences and knowledge Strong experience with C# / .NET – min. 5 years of commercial experience Hands-on experience with Kubernetes and basic Azure cloud knowledge Experience with Python Strong practical experience with PostgreSQL Experience with event-driven architecture and asynchronous messaging systems English proficiency at a minimum B2 level Ability to work independently and as part of a cross-functional engineering team Nice to have : Experience with migration and platform transformation projects React / TypeScript skills Python skills focused on data engineering, analytics, ETL, and data processing Hands-on experience with Kafka Experience with modern data platform ecosystems Experience designing and developing cloud-native architectures Technologies you'll work with C# / .NET Python Apache Kafka Apache Iceberg PostgreSQL GreptimeDB / Time-series databases React, TypeScript Kubernetes Azure Cloud SpiceDB / ReBAC Event-driven microservices architecture Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. 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: Full-stack role focused on building and maintaining scalable web and mobile applications using React/React Native on the frontend and Java-based backend services within a microservices architecture. The position involves end-to-end feature development, REST API design, and ensuring performance, security, and scalability in a production environment. You will contribute to CI/CD, deployments, and continuous platform improvements in a modern tech stack. 🗂️ Requirements: 6+ years full-stack development experience, Strong experience with React or React Native, Strong command of Java, Experience building REST APIs, Experience with HTTP protocols, Understanding of frontend architecture and state management, Experience with SQL and NoSQL databases (PostgreSQL, MongoDB, Redis), Knowledge of CI/CD pipelines and deployment processes, Experience with microservices architecture 📃 Skills: Java, React, ReactNative, Node.js, REST, HTTP, SQL, PostgreSQL, MongoDB, Redis, Microservices, CI/CD, AWS, Azure, GCP, Docker, Kubernetes 🏢 Description: Salary: 1000-1300 pln/md on B2B Work mode: Elastic hybrid from Gdynia/Gdańsk (1-2 days per week from the office) Why choose this offer? End‑to‑end ownership w ith a modern tech stack Stability combined with continuous growth Autonomy and high‑quality collaboration Project The project focuses on building and maintaining scalable web and mobile applications used by a large and diverse user base. It involves developing modern, user‑friendly interfaces with React or React Native and integrating them with robust backend services built in Java . The system is based on RESTful APIs and microservices architecture, ensuring high performance, security, and scalability. You will work closely with product, design, and QA teams to continuously improve the platform and deliver high‑quality features to production. Responsibilities you'll have Design and develop responsive web and mobile applications using React or React Native Build and maintain backend services and APIs using Java (preferred) or Node.js Develop reusable components, modules, and libraries Design and implement RESTful APIs and microservices Integrate front-end applications with backend systems and third-party services Ensure application performance, scalability, and security Collaborate with cross-functional teams including designers, product managers, and QA Participate in code reviews and maintain code quality standards Support deployment, CI/CD pipelines, and production releases Expected competences and knowledge Over 6 years of experience in full-stack development Good experience with React or React Native Strong command of Java Experience building REST APIs and working with HTTP protocols Understanding of frontend architecture, state management, and component-based design Solid level of SQL / NoSQL (Postgres, Mongo, Redis) Knowledge of CI/CD pipelines and deployment processes Strong problem-solving and analytical skills Good command of AI-powered coding and trust in AI Strong communication and collaboration skills Ability to work independently and within a team Attention to detail and commitment to quality Ability to manage multiple tasks and priorities Adaptability and willingness to learn new technologies Nice to have Experience with microservices architecture Familiarity with cloud platforms (AWS, Azure, or GCP) Experience with containerization (Docker, Kubernetes) Knowledge of testing frameworks and automated testing Experience with mobile app deployment (App Store / Google Play) Technologies you'll work with Java React React Native REST APIs HTTP SQL (PostgreSQL) NoSQL (MongoDB, Redis) Node.js Microservices CI/CD pipelines AWS/Azure/GCP Docker Kubernetes App Store/Google Play AI Client – why choose this particular client from the Jit portfolio? Our client is an international financial services organization operating in the capital markets domain, focused on processing and analyzing large volumes of transactional data. The company develops modern data platforms that support trading, operational efficiency, and regulatory reporting. It operates in a fast-paced, highly regulated environment with a strong emphasis on scalability, data quality, and advanced analytics. 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 .NET Developer role focused on building cloud-native, data-intensive platforms for intelligent heating and smart building systems. The position involves developing event-driven services, scalable analytics, and real-time operational insights using modern backend, cloud, and data technologies. Flexible hybrid work is available from multiple Polish cities. 🗂️ Requirements: 5+ years commercial experience with C#, .NET experience, Experience with Kubernetes, Basic Azure knowledge, Practical Python experience, Strong PostgreSQL experience, Experience with event-driven architecture, Experience with asynchronous messaging systems, English level B2 or higher, Ability to work in cross-functional teams 📃 Skills: C#, .NET, Python, Kafka, Iceberg, PostgreSQL, GreptimeDB, React, TypeScript, Kubernetes, Azure, SpiceDB, Microservices 🏢 Description: Salary: 1250 - 1500 PLN/MD + VAT Remote: flexible hybrid from Gdynia / Kraków / Warszawa / Rzeszów Why choose this offer? You will have the opportunity to develop and improve a software tool which helps provide customers all over the world with tailor-made heating and cooling solutions Your work will help create more sustainable, cost-efficient and environment friendly heating and cooling solutions The Jit community will bring you a nice time during regular integration meetings Project We are looking for experienced Senior .Net Developer who will be part of a team developing modern software solutions for the energy and smart building industry, focused on intelligent heating and hot water management systems. You will join a team building modern data-intensive and cloud-native software platforms focused on scalable analytics, distributed event processing, and real-time operational insights. You’ll work closely with backend, frontend, and platform engineers to design and develop event-driven services, cloud infrastructure, and user-facing applications. Expected competences and knowledge Strong experience with C# / .NET – min. 5 years of commercial experience Hands-on experience with Kubernetes and basic Azure cloud knowledge Practical experience with Python Strong practical experience with PostgreSQL Experience with event-driven architecture and asynchronous messaging systems English proficiency at a minimum B2 level Ability to work independently and as part of a cross-functional engineering team Nice to have : Experience with migration and platform transformation projects React / TypeScript skills Python skills focused on data engineering, analytics, ETL, and data processing Hands-on experience with Kafka Experience with modern data platform ecosystems Experience designing and developing cloud-native architectures Technologies you'll work with C# / .NET Python Apache Kafka Apache Iceberg PostgreSQL GreptimeDB / Time-series databases React, TypeScript Kubernetes Azure Cloud SpiceDB / ReBAC Event-driven microservices architecture Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. 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: Senior .NET Developer role focused on building scalable, cloud-native platforms for intelligent heating and energy management systems in the smart building industry. The position involves developing event-driven services, cloud infrastructure, and user-facing applications supporting distributed energy devices. The project centers on sustainable, efficient heating and cooling solutions. 🗂️ Requirements: Minimum 5 years experience with C# and .NET, Experience with Azure cloud ecosystem, Experience with MongoDB, Experience with event-driven architecture, English proficiency at B2 level or higher, Ability to work independently and in cross-functional team 📃 Skills: C#, .NET, Azure, MongoDB, PostgreSQL, Kafka, Kubernetes, React, TypeScript, Python, Microservices 🏢 Description: Salary: 1000 - 1500 PLN/MD + VAT Remote: flexible hybrid from Gdynia / Kraków / Warszawa / Rzeszów Why choose this offer? You will have the opportunity to develop and improve a software tool which helps provide customers all over the world with tailor-made heating and cooling solutions Your work will help create more sustainable, cost-efficient and environment friendly heating and cooling solutions The Jit community will bring you a nice time during regular integration meetings Project We are looking for experienced Senior .Net Developer who will be part of a team developing modern software solutions for the energy and smart building industry, focused on intelligent heating and hot water management systems. The project involves building scalable cloud-native platforms that support monitoring, optimization, and automation of distributed energy devices used in residential and commercial environments. You’ll work closely with backend, frontend, and platform engineers to design and develop event-driven services, cloud infrastructure, and user-facing applications. Expected competences and knowledge Strong experience with C# / .NET - min. 5 years of experience Knowledge of Azure cloud ecosystem Experience with MongoDB Experience with event-driven architecture English proficiency at a minimum B2 level Ability to work independently and as part of a cross-functional engineering team Nice to have : Experience with Kafka Experience with Kubernetes Familiarity with React / TypeScript Familiarity with PostgreSQL Experience with migration and platform transformation projects Technologies you'll work with C# / .NET Azure Cloud React, TypeScript MongoDB, PostgreSQL Kafka Python Kubernetes Event-driven microservices architecture Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. 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: Remote B2B role focused on building and expanding a large-scale analytical and operational data ecosystem delivering campaign performance insights and investment decision support. The position involves developing high-throughput data pipelines, reporting engines, and attribution systems using a modern cloud-based stack. You will work on production-grade data models and scalable systems supporting millions of users. 🗂️ Requirements: Minimum 3 years commercial experience with Java or Kotlin or Scala, Experience with distributed data pipelines, Experience with data processing and analytics systems, Knowledge of GCP cloud environment, Experience with large-scale data systems, Understanding of microservices architecture, Understanding of event-driven systems, Knowledge of data modeling, Willingness to participate in on-call duties, Availability for monthly visits to Warsaw 📃 Skills: Java, Kotlin, Scala, GCP, BigQuery, PostgreSQL, Airflow, Composer, Spark, Spring, Kafka, Microservices, Avro, Terraform, Analytics, DataModeling 🏢 Description: Salary: 600-960 pln/md on B2B Work mode: Remote (with visits to Warsaw once a month and w illingness to participate in on-call duties) Why choose this offer? Work on a high-impact data ecosystem Exposure to large-scale data processing , advanced analytics, and production-grade data models Modern tech stack (GCP, Spark, Airflow, Kafka, microservices) Project Development and expansion of an advanced analytical and operational ecosystem . The project focuses on delivering precise campaign performance data (Insights & Performance) and building tools that support large-scale investment decision-making. It includes creating reliable reporting systems, data attribution models, and scalable data pipelines, ensuring high-quality data availability for professional users. Expected competences and knowledge At least 3 years of commercial experience with Java / Kotlin / Scala Solid understanding of data processing and analytics systems Experience with distributed data pipelines and orchestration tools Knowledge of GCP cloud environment Experience working with large-scale data systems (e.g. BigQuery, Spark) Familiarity with microservices architecture and event-driven systems Understanding of data modeling and data productionization Nice to have Knowledge of Apache ecosystem, Avro, Terraform Responsibilities you’ll have Designing and developing reporting engines and attribution systems (Insights & Performance) Building and maintaining high-throughput data pipelines Collaborating with Data Science teams to productionize advanced data models Ensuring scalability, reliability, and performance of data systems Developing internal tools (bulk management, agency panels, RBAC systems) Supporting complex account structures and permissions management Willingness to participate in on-call duties Technologies you'll work with Java / Kotlin / Scala GCP (BigQuery) PostgreSQL Apache Airflow / Composer Apache Spark Spring Boot Kafka Microservices architecture Apache, Avro, Terraform Client – why choose this particular client from the Jit portfolio? Our Client dominates the Polish e-commerce arena as the market leader since 1999 . With a user base of over 20 million and growing, this well-established platform is at the forefront of e-commerce, constantly striving for growth through market expansion and investment. As a major player in technology, our Client boasts a talented IT team of over 1,000 employees who focus on developing their own cutting-edge technologies. Jit Team has had a successful partnership with our Client since spring 2021 , with multiple software development teams dedicated to our Client's platforms. These teams operate autonomously, designing platform components through micro-services. Working with our Client offers a chance to contribute to a solution used by millions on a daily basis and to tackle the challenge of delivering software at a massive scale , where even a single second of delay can have a significant impact. This project provides a unique opportunity to work with state-of-the-art technologies and tools, making it a rare and valuable experience. 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.