Full stack Developer (Java+React)

🏢 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: Remote B2B opportunity for a Test Automation Engineer focused on designing and maintaining automated test frameworks, performing API and backend testing, and working in a Linux-based environment. The role involves close collaboration with developers, defect analysis, and contributing to continuous improvement of testing practices. 🗂️ Requirements: Minimum 1 year of experience in software testing with focus on test automation, Strong programming skills in Python, Solid knowledge of Linux operating systems, Experience with GIT version control, Proficiency in Bash scripting, Hands-on experience in API testing with RESTful services, Understanding of SDLC, Knowledge of testing methodologies 📃 Skills: Python, Linux, GIT, Bash, REST, API, SDLC, Docker, Kubernetes, CI/CD 🏢 Description: 100% remote B2B: 80-110 zł/h netto + VAT Responsibilities Design, develop, and maintain automated test scripts and frameworks Execute automated and manual tests to validate software functionality, performance, and reliability Perform API testing and validate backend services Analyze test results, identify defects, and work closely with developers to resolve issues Write clear and concise test documentation and reports Participate in code reviews and contribute to continuous improvement of testing practices Work in a Linux-based environment and use command-line tools effectively Requirements 1+ year of experience in software testing with a focus on test automation Strong programming skills in Python Solid understanding of Linux operating systems Experience using GIT for version control Proficiency in bash scripting Hands-on experience with API testing (RESTful services) Understanding of software development life cycle (SDLC) and testing methodologies Nice to Have Experience with Docker Familiarity with Kubernetes Exposure to CI/CD pipelines and cloud-based environments What We Offer 100% remote Private healthcare Multisport card Life insurance PowerYou - e-learning platform

🏢 Summary: Long-term remote B2B contract for a technical leader responsible for guiding a development team in building and maintaining scalable applications within an agile environment. The role combines hands-on .NET development with strategic oversight, technical analysis, and quality management. Focus is on delivering robust, cloud-oriented solutions and improving application delivery speed. 🗂️ Requirements: Proficiency in .NET and C#, Experience in full-stack development, Experience with front-end technologies, Experience with document-based databases, Knowledge of event-based messaging frameworks, Experience with cloud services, Experience with containerization, Ability to lead development team, Experience in building scalable systems 📃 Skills: .NET, C#, Angular, MongoDB, Cloud, Docker, Messaging, SQL 🏢 Description: Work model: 100% remote Start date: 30.06.2026 Rate: 160-180 PLN/h netto + VAT Contract : B2B, long-term cooperation (12-month contract up front + extensions) Recruitment process : 2 stages, including a technical test estimated to take 2-4 hours. Summary: The role focuses on leading the development team to create new solutions and maintain systems within an agile environment, emphasizing the importance of robust applications and strategic direction. Main Responsibilities: Lead the development team in creating and maintaining applications. Adopt wider technology practices and address the speed of new application delivery. Engage in hands-on development while guiding the strategic direction of projects. Collaborate with teams to gather specifications and perform technical analysis. Navigate complex systems and ensure they are built to scale. Manage developer quality and capacity amidst organizational constraints. Key Requirements: Proficient in .NET and C#. Experience with full-stack development, including front-end technologies. Familiarity with document-based databases. Knowledge of event-based messaging frameworks. Experience with cloud services and containerization. Nice to Have: Prior experience in the banking or financial services sector. Familiarity with Angular or other modern front-end frameworks. Experience with MongoDB or similar environments. Other Details: Environment: .NET, C#, Angular, MongoDB, moving towards cloud solutions. Team Structure: Full Stack Developers working closely with Business Analysts.

🏢 Summary: Technical leadership role focused on driving the development and maintenance of scalable .NET-based applications in an agile environment. The position combines hands-on full-stack development with strategic oversight of architecture, quality, and delivery speed. It involves close collaboration with cross-functional teams to build robust, cloud-oriented solutions. 🗂️ Requirements: Proficiency in .NET and C#, Experience in full-stack development, Knowledge of front-end technologies, Experience with document-based databases, Knowledge of event-based messaging frameworks, Experience with cloud services, Experience with containerization, Ability to design scalable systems, Experience leading development teams 📃 Skills: .NET, C#, Angular, MongoDB, Cloud, Docker, Kubernetes, Microservices, REST, Git 🏢 Description: Work model: 100% remote Start date: 30.06.2026 Rate: 160-180 PLN/h netto + VAT Contract : B2B, long-term cooperation (12-month contract up front + extensions) Recruitment process : 2 stages, including a technical test estimated to take 2-4 hours. Summary: The role focuses on leading the development team to create new solutions and maintain systems within an agile environment, emphasizing the importance of robust applications and strategic direction. Main Responsibilities: Lead the development team in creating and maintaining applications. Adopt wider technology practices and address the speed of new application delivery. Engage in hands-on development while guiding the strategic direction of projects. Collaborate with teams to gather specifications and perform technical analysis. Navigate complex systems and ensure they are built to scale. Manage developer quality and capacity amidst organizational constraints. Key Requirements: Proficient in .NET and C#. Experience with full-stack development, including front-end technologies. Familiarity with document-based databases. Knowledge of event-based messaging frameworks. Experience with cloud services and containerization. Nice to Have: Prior experience in the banking or financial services sector. Familiarity with Angular or other modern front-end frameworks. Experience with MongoDB or similar environments. Other Details: Environment: .NET, C#, Angular, MongoDB, moving towards cloud solutions. Team Structure: Full Stack Developers working closely with Business Analysts.

🏢 Summary: Remote Senior Java Developer role focused on designing and implementing new functionalities in distributed systems using Spring ecosystem. The position involves developing REST APIs, writing automated tests, and working according to SOLID, GRASP, TDD, and DDD principles. Offered rate is 120–140 PLN/h on B2B contract. 🗂️ Requirements: Minimum 5 years of commercial experience in Java, Very good knowledge of Java, Practical experience with Spring Framework, Practical experience with Spring Boot, Experience in building distributed systems, Knowledge of SOLID and GRASP principles, Practical knowledge of TDD, Practical knowledge of DDD, Experience with REST API development, Ability to create automated tests, Knowledge of coding standards 📃 Skills: Java, Spring, SpringBoot, REST, TDD, DDD, SOLID, GRASP, Microservices, JUnit 🏢 Description: 📍 Lokalizacja: zdalnie 💰 Wynagrodzenie: 120-140 PLN/h Oczekiwania: min. 5 lat doświadczenia komercyjnego w programowaniu w Java, Bardzo dobra znajomość programowania w języku Java, Praktyczna znajomość Spring Framework, Spring Boot, Doświadczenie w tworzeniu systemów rozproszonych, Znajomość i praktyczne wykorzystywanie zasad SOLID, GRASP, Praktyczna znajomość TDD, DDD, Praktyczna znajomość API REST, Samodzielność i nastawienie na realizację celów, Umiejętność współpracy z innymi. Obowiązki: Projektowanie i implementacja nowych funkcjonalności na podstawie wymagań, Tworzenie i aktualizacja dokumentacji projektowej, Szacowanie wymaganego nakładu pracy dla realizowanych zagadnień, Raportowanie postępu w trakcie cyklicznych spotkań, Aktywne uczestniczenie w spotkaniach projektowych, Tworzenie automatycznych testów, Przestrzeganie ustalonych przez Wykonawcę zasad dotyczących standardów kodowania Oferujemy: Stawka do 140 zł/h netto na b2b Przelew w dogodnej formie Krótki 14-dniowy termin płatności faktury Bogaty pakiet usług prywatnej opieki medycznej Dostęp do platformy kafeteryjnej MyBenefit (umożliwiającej zamawianie kart Multisport, kart przedpłaconych do Ikea, Zalando, Notino i wielu innych)

🏢 Summary: 100% remote B2B opportunity to lead a development team in building and maintaining scalable applications within an agile environment. The role combines hands-on full-stack development with strategic technical leadership, focusing on robust system architecture and faster delivery of new solutions. Long-term cooperation with a two-stage recruitment process including a technical test. 🗂️ Requirements: Proficiency in .NET, Proficiency in C#, Experience in full-stack development, Experience with front-end technologies, Experience with document-based databases, Knowledge of event-based messaging frameworks, Experience with cloud services, Experience with containerization, Ability to lead development teams, Experience working in agile environment 📃 Skills: .NET, C#, Angular, MongoDB, Cloud, Docker, Microservices, REST, Git 🏢 Description: Work model: 100% remote Start date: Flexible Rate: up to 215 PLN/h netto + VAT Contract : B2B, long-term cooperation (12-month contract up front + extensions) Recruitment process : 2 stages, including a technical test estimated to take 2-4 hours. Summary: The role focuses on leading the development team to create new solutions and maintain systems within an agile environment, emphasizing the importance of robust applications and strategic direction. Main Responsibilities: Lead the development team in creating and maintaining applications. Adopt wider technology practices and address the speed of new application delivery. Engage in hands-on development while guiding the strategic direction of projects. Collaborate with teams to gather specifications and perform technical analysis. Navigate complex systems and ensure they are built to scale. Manage developer quality and capacity amidst organizational constraints. Key Requirements: Proficient in .NET and C#. Experience with full-stack development, including front-end technologies. Familiarity with document-based databases. Knowledge of event-based messaging frameworks. Experience with cloud services and containerization. Nice to Have: Prior experience in the banking or financial services sector. Familiarity with Angular or other modern front-end frameworks. Experience with MongoDB or similar environments. Other Details: Environment: .NET, C#, Angular, MongoDB, moving towards cloud solutions. Team Structure: Full Stack Developers working closely with Business Analysts.

🏢 Summary: 100% remote B2B contract (up to 170 PLN/h) for a Backend Developer focused on building and evolving microservices-based systems in Java and Spring Boot. The role involves designing REST APIs, implementing secure and reliable inter-service communication, and working with distributed system patterns. You will also contribute to CI/CD pipelines, automated testing, and selected backend components in Node.js within an Agile team. 🗂️ Requirements: Java 17/21 proficiency, Experience with Spring Boot, Ability to design and develop REST API, Knowledge of Node.js, Understanding of microservices architecture, Knowledge of reliability patterns (retry, timeout, circuit breaker), Experience with Docker, Ability to write unit and integration tests (JUnit 5, Mockito, Jest), Experience with relational databases, SQL proficiency, Experience with Git version control 📃 Skills: Java, Spring, SpringBoot, REST, Node.js, TypeScript, Docker, SQL, Git, JUnit, Mockito, Jest, GitHubActions, Microservices 🏢 Description: 100% remote B2B do 170zł/h Start ASAP/do ustalenia Responsibilities: Projektowanie, budowa i rozwój backendu w oparciu o Java 17/21 oraz Spring Boot. Tworzenie i rozwój REST API oraz implementacja mechanizmów bezpieczeństwa. Udział w projektowaniu i utrzymaniu architektury mikroserwisowej. Implementacja komunikacji między serwisami (REST, messaging/event-driven) oraz wzorców niezawodności (retry, timeout, circuit breaker). Praca nad aspektami systemów rozproszonych, takimi jak idempotency, eventual consistency, observability. Konteneryzacja aplikacji za pomocą Docker oraz utrzymanie konfiguracji (Dockerfile, docker-compose). Rozwój wybranych komponentów backendowych w Node.js (TypeScript). Tworzenie i utrzymanie pipeline’ów CI/CD (GitHub Actions). Pisanie testów jednostkowych i integracyjnych (JUnit 5, Mockito, Jest) oraz dbanie o jakość i pokrycie kodu. Współpraca w modelu code review, praca z Git i PR. Udział w pracy zespołu Agile. Must Haves: Znajomość Java 17/21. Doświadczenie z Spring Boot. Umiejętność tworzenia REST API. Znajomość Node.js. Znajomość mikroserwisów oraz wzorców niezawodności. Doświadczenie z Docker. Umiejętność pisania testów jednostkowych i integracyjnych (JUnit 5, Mockito, Jest). Umiejętność pracy z relacyjnymi bazami danych i SQL. Znajomość systemów kontroli wersji (Git). Nice to Haves: Doświadczenie z Adobe AEM 6.5 i integracją backendu z AEM.

🏢 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: Fullstack Developer role focused on building and evolving Java-based microservices and modern Angular Single Page Applications within an event-driven architecture. The position emphasizes backend development with Spring Boot, Kafka integration, and secure, scalable solutions, while contributing to CI/CD pipelines and frontend best practices. Work involves close collaboration on solution design, security implementation, and continuous improvement in an Agile environment. 🗂️ Requirements: Strong hands-on experience with Java 17–21, Strong experience with Spring Boot 3.x, Experience with microservices architecture, Experience with Kafka in event-driven or messaging systems, Strong practical experience with SQL and Oracle, Experience or strong understanding of Redis, Experience with Domain Driven Design, Experience with Node.js, Experience with TypeScript, Experience building Single Page Applications with Angular, Strong knowledge of Angular architecture and best practices, Strong understanding of web application security, Practical knowledge of OIDC and OAuth2, Experience with Git, Experience working in Agile methodologies 📃 Skills: Java, Spring, SpringBoot, Microservices, Kafka, SQL, Oracle, Redis, DDD, Node.js, TypeScript, Angular, SPA, Security, OIDC, OAuth2, Git, Agile 🏢 Description: Location: Hybrid work model – 2-3 days per week from the Warsaw office Salary: 160 – 170 PLN net/h (B2B via Experis) Tasks: •    Design, develop, and maintain fullstack applications with a strong emphasis on backend and modern frontend architectures •    Build high-quality, maintainable, secure, scalable, and testable software aligned with business requirements •    Develop and evolve Java-based microservices using Spring Boot •    Contribute to Single Page Applications development ensuring frontend best practices •    Collaborate with business and technical stakeholders to clarify and refine functional and non-functional requirements •    Participate in solution design pre-project studies and technical decision-making •    Integrate systems using event-driven architectures and streaming platforms •    Optimize and maintain existing codebases •    Implement execute and maintain automated tests and CI/CD pipelines •    Ensure application security including identity management and secure authentication flows •    Maintain and update technical documentation •    Participate in internal and external developer communities to share best practices •    Continuously improve skills in modern technologies and software engineering practices Requirements: Backend & Architecture •    Strong hands-on experience with Java 17–21 focusing on modern Java •    Strong experience with Spring Boot 3.x and microservices architectures •    Required experience with Kafka in event-driven or messaging-based systems •    Strong practical experience with SQL using Oracle •    Experience or strong understanding of Redis •    Experience with Domain Driven Design Frontend •    Required experience with Node.js •    Required experience with TypeScript •    Solid experience building Single Page Applications using Angular •    Strong knowledge of Angular best practices architecture and maintainability •    Experience with SPA development •    Webpack knowledge is a nice to have Security •    Strong understanding of web application security •    Practical knowledge of OIDC and OAuth2 protocols •    Experience with identity management platforms as a strong advantage •    Awareness of OWASP principles certifications are a plus DevOps & Tooling •    Required experience with Git •    Experience with CI/CD pipelines GitLab CI and Jenkins as a nice to have •    Maven knowledge as a nice to have •    Docker and Kubernetes knowledge as a nice to have •    Experience with IntelliJ and VS Code •    Knowledge of Jira and Confluence •    Python knowledge as a nice to have •    Practice with AI based code generation tools as a nice to have Methodologies & Ways of Working •    Experience working in Agile methodologies such as Scrum and Kanban •    DevOps mindset and practices •    Ability to collaborate in distributed international teams Offer: •    Multisport card •    Private healthcare •    Access to an e‑learning platform •    Group life insurance

🏢 Summary: Senior Frontend Developer role focused on stabilizing and developing a complex cross-platform application built with React and Electron, integrating web, desktop, and embedded environments with hardware devices via proprietary protocols. The position involves architectural contributions, code refactoring, and close collaboration with backend and hardware teams in a technically demanding environment. Remote work with occasional on-site presence in Rzeszów. 🗂️ Requirements: Senior-level experience as Frontend Developer, Advanced knowledge of React, Advanced knowledge of JavaScript, Experience with Electron, Experience integrating applications with hardware or devices, Understanding of cross-platform systems (web, desktop, embedded), Ability to work with low-level or proprietary communication protocols, Experience analyzing and refactoring complex systems, Good understanding of backend architecture and collaboration 📃 Skills: React, JavaScript, TypeScript, Electron, IoT, Embedded, Protocols, Web, Desktop 🏢 Description: Salary: 1100-1150 PLN/day on B2B Remote: remote / hybrid Rzeszów (2 days from the office per week) Why choose this offer? Development and maintenance of a frontend application based on React and JavaScript Support in stabilizing the existing solution and identifying architectural issues Working with system–device communication (client’s proprietary protocol) Development of a desktop application based on Electron Collaboration with backend and hardware/embedded teams Analysis and refactoring of code shared across web, desktop, and embedded environments Contribution to designing the solution architecture in a cross-platform environment Supporting the team in making technical and architectural decisions Project We are looking for an experienced Senior Frontend Developer to support the team in stabilizing and further developing an existing web application that integrates with hardware via a dedicated network protocol. The project is complex in nature—the application communicates with hardware devices, and part of the codebase has been designed in a universal way, enabling its use across web, desktop, and embedded environments. Therefore, a strong understanding of such systems and experience working at the intersection of software and hardware are essential. Expected competences and knowledge Very strong experience as a Frontend Developer (Senior / Lead) Advanced knowledge of React and JavaScript (TypeScript is a plus) Experience working with Electron Experience working with applications integrating with devices / hardware (e.g., IoT, embedded systems, device communication) Understanding of challenges related to cross-platform systems (web / desktop / embedded) Ability to work with more “low-level” system communication logic (proprietary or similar protocols) Experience in analyzing and refactoring existing, complex systems Good understanding of backend (in terms of collaboration and architecture) Ability to work in a highly complex technical environment Technologies you'll work with React JavaScript TypeScript Electron 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 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.