Fullstack Java & React Developer – Kraków (Hybrid)

🏢 Summary: Hybrid Java Fullstack Developer role focused on building and maintaining scalable web applications using Java and React.js. The position involves developing backend services, modern frontend interfaces, and RESTful APIs while supporting CI/CD processes. Work model includes two days onsite in Warsaw with the remaining days remote. 🗂️ Requirements: Strong experience with Java, Solid experience with React.js, Experience building and consuming REST APIs, Strong knowledge of JavaScript, Strong knowledge of HTML, Strong knowledge of CSS, Experience with Git, Experience with CI/CD pipelines, Familiarity with Agile environments, English proficiency 📃 Skills: Java, React, REST, JavaScript, HTML, CSS, Git, CI/CD, Spring, TypeScript, SQL, Docker 🏢 Description: We are looking for an experienced Java Fullstack Developer to join our development team in Kraków. In this role, you will work on building and maintaining scalable web applications, contributing to both backend services and modern frontend interfaces. This position follows a hybrid working model with two/three days per week onsite in Warsaw . Key Responsibilities Develop and maintain backend services using Java Build responsive and modern user interfaces using React.js Design and implement RESTful APIs Collaborate with product managers, designers, and engineers to deliver new features Write clean, maintainable, and efficient code Participate in code reviews and contribute to development best practices Troubleshoot and resolve technical issues Support integration and deployment through CI/CD pipelines Required Skills and Experience Strong experience with Java Solid experience with React.js Experience building and consuming REST APIs Strong knowledge of JavaScript, HTML, and CSS Experience with Git and modern development workflows Familiarity with Agile development environments Good communication skills in English Nice to Have Experience with Spring Boot Experience with TypeScript Knowledge of SQL databases Familiarity with Docker or cloud platforms Work Model Hybrid: 2 days onsite in Warsaw , remaining days remote.

🏢 Summary: Full Stack Developer role focused on building scalable backend services in Java and modern, responsive front-end applications in React.js. The position involves designing RESTful APIs, collaborating with cross-functional teams, and delivering clean, maintainable, high-quality code in a hybrid work model. 🗂️ Requirements: Commercial experience with Java, Experience with Spring Boot framework, Strong knowledge of React.js, Proficiency in modern JavaScript, Experience designing and consuming RESTful APIs, Experience with relational or non-relational databases, Experience with version-controlled collaborative development, Availability to work onsite in hybrid model (Cracow) 📃 Skills: Java, SpringBoot, React, JavaScript, REST, SQL, NoSQL, AWS, Azure, GCP, Docker, Kubernetes, CICD 🏢 Description: 𝗪𝗲 𝗔𝗿𝗲 𝗛𝗶𝗿𝗶𝗻𝗴: 𝗝𝗮𝘃𝗮 𝗮𝗻𝗱 𝗥𝗲𝗮𝗰𝘁.𝗷𝘀 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 We are currently seeking a skilled and motivated Full Stack Developer with strong expertise in Java and React.js to join our growing team. In this role, you will be responsible for designing and developing scalable backend services using Java, as well as building modern, responsive user interfaces using React.js. You will work closely with cross-functional teams to deliver high-quality, reliable solutions, while ensuring that your code is clean, maintainable, and efficient. 𝗞𝗲𝘆 𝗥𝗲𝘀𝗽𝗼𝗻𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀: Developing robust backend applications using Java, ideally with Spring Boot Creating intuitive and high-performing front-end applications using React.js and modern JavaScript Designing and consuming RESTful application programming interfaces Collaborating with colleagues across engineering, product, and design teams Contributing to code reviews and continuous improvement practices 𝗪𝗲 𝗮𝗿𝗲 𝗹𝗼𝗼𝗸𝗶𝗻𝗴 𝗳𝗼𝗿 𝗰𝗮𝗻𝗱𝗶𝗱𝗮𝘁𝗲𝘀 𝘄𝗵𝗼 𝗵𝗮𝘃𝗲: Proven experience working with Java and related frameworks Strong knowledge of React.js and modern JavaScript standards Experience working with relational or non-relational databases A proactive approach to problem-solving and a strong attention to detail Excellent communication and teamwork skills It would be beneficial if you also have: Experience working with cloud platforms such as Amazon Web Services, Microsoft Azure, or Google Cloud Platform Exposure to continuous integration and continuous delivery pipelines Familiarity with containerisation technologies such as Docker and Kubernetes 📍 𝗟𝗼𝗰𝗮𝘁𝗶𝗼𝗻: Cracow, Poland (Hybrid – 3 days per week onsite) 💼 𝗘𝗺𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 𝗧𝘆𝗽𝗲: B2B If you are passionate about building impactful technology and are looking to take the next step in your career, we would be delighted to hear from you. Please apply or get in touch directly for more information.

🏢 Summary: B2B FullStack Developer role focused on building and enhancing a Client Onboarding platform for Global Banking and Markets using Java and React in a hybrid Kraków-based environment. The position involves developing REST APIs, working with microservices, improving system performance and security, and supporting production systems. Candidates will collaborate in a fast-paced DevOps-oriented team delivering innovative onboarding solutions. 🗂️ Requirements: Java 8+, React, Microservices, REST APIs, Testing, CI/CD, Debugging, Security awareness, Database schema design, PostgreSQL, DevOps, Problem-solving, Analytical skills, Collaborative environment experience 📃 Skills: Java, React, REST, Microservices, CI/CD, PostgreSQL, DevOps, Testing, Security 🏢 Description: As a FullStack Developer in our Kraków office, you will contribute to the development of a user-friendly Client Onboarding experience for Global Banking and Markets. This role emphasizes innovative thinking and a commitment to improving client experiences through technology. Work model: Hybrid (6 times per month work from office-Cracow) Business trips: n/a Start: ASAP/ one month notice period Assignment type: B2B Budget: 150-190 zł/h Main Responsibilities: Develop and maintain the Client Onboarding solution using Java and React. Debug existing code and extend functionality where necessary. Implement REST APIs in line with microservice architecture. Create and execute tests to ensure the reliability of functionalities and endpoints. Participate in performance and stability improvement initiatives. Contribute to security implementations around services and endpoints. Engage in production support as part of a rotating schedule. Key Requirements: Strong knowledge of Java 8+ / 18+ Proficient in React JS Ability to understand and debug existing code Experience with microservice architecture Experience with writing REST APIs Skill in writing tests to verify code functionality Familiarity with CI/CD tooling Strong security awareness in development practices Self-motivated with rapid learning capabilities Experience in a collaborative and fast-paced environment Strong problem-solving and analytical skills Good understanding of database schema design; knowledge of PostgreSQL is a plus Able to work in a DevOps environment Nice to Have: Familiar with DevOps practices Experience with cloud platforms Other Details: This position is based in Kraków, requiring hybrid work with meetings held online. The role involves substantial collaboration on innovative solutions aimed at enhancing the client onboarding process. Regular coding interviews will be conducted to assess coding skills.

🏢 Summary: Fullstack Developer role focused on building and enhancing an onboarding platform for institutional clients with a strong emphasis on Java backend development and React frontend work. The position involves working in a microservices environment, developing new features, maintaining applications, and collaborating closely with stakeholders while following TDD and high code quality standards. 🗂️ Requirements: 5+ years of software development experience, Strong Java knowledge, Experience with React, Experience with JavaScript, Experience with TypeScript, Experience building component-based applications, Knowledge of CSS3, Knowledge of design systems, Knowledge of design tokens, Experience with JSON, Experience with XML, Experience with Jest, Experience with Testing Library, Experience working with TDD, Ability to deliver high-quality code, Experience working with stakeholders, English level B2 or higher 📃 Skills: Java, React, JavaScript, TypeScript, CSS3, JSON, XML, Jest, TestingLibrary, TDD, Git, IntelliJ, VSCode, ReactNative 🏢 Description: Szukamy Fullstack Developera (70% Java / 30% React) , który będzie rozwijał platformę onboardingową dla klientów instytucjonalnych. Rola wymaga połączenia bardzo mocnego backendu (Java) z doświadczeniem frontendowym (React), pracy w środowisku mikroserwisowym oraz dużego nacisku na jakość (TDD), UX oraz współpracę z biznesem i stakeholderami. Lokalizacja: Kraków, praca hybrydowa (2 dni z biura) . Zadania: Rozwój backendu w Javie (główna część pracy), Rozwój UI w React, Projektowanie i tworzenie nowych funkcjonalności, Testowanie i utrzymanie aplikacji, Współpraca ze stakeholderami i zespołem. Wymagania (must have): M inimum 5 lat doświadczenia w tworzeniu oprogramowania , Bardzo dobra znajomość Java (główna część pracy – backend) , Doświadczenie w pracy z React, JavaScript oraz TypeScript , Budowanie i rozwijanie aplikacji komponentowych (React / React Native) , Znajomość CSS3 oraz systemy designu i design tokens , Doświadczenie w pracy z JSON i XML (marshalling danych), Doświadczenie w testach front-endowych (Jest, Testing Library) , Praca zgodnie z zasadami Test Driven Development (TDD) , Dostarczanie rozwiązań wysokiej jakości i dbanie o standardy kodu, Doświadczenie w pracy ze stakeholderami i zrozumienie potrzeb biznesu, Język angielski na poziomie minimum B2 . Wymagania (nice to have): Doświadczenie w projektowaniu produktów cyfrowych w bankowości lub onboardingu , Doświadczenie z narzędziami developerskimi ( Git, IntelliJ, VSCode ), Doświadczenie w mentoringu zespołu i podnoszeniu standardów technicznych.

🏢 Summary: Fullstack Developer role focused primarily on backend development in Java (70%) with frontend work in React (30%) to build and enhance an onboarding platform for institutional clients. The position involves working in a microservices architecture with strong emphasis on TDD, code quality, and modern UI standards. Hybrid work model based in Kraków. 🗂️ Requirements: Minimum 5 years of software development experience, Strong proficiency in Java, Commercial experience with React, Experience with JavaScript and TypeScript, Experience building component-based applications (React), Knowledge of CSS3 and design systems, Experience working with JSON and XML, Experience with frontend testing (Jest, Testing Library), Practical experience with Test Driven Development (TDD), Experience working in microservices architecture 📃 Skills: Java, React, JavaScript, TypeScript, CSS3, JSON, XML, Jest, TestingLibrary, TDD, Microservices, Git, IntelliJ, VSCode, ReactNative 🏢 Description: Szukamy Fullstack Developera (70% Java / 30% React) , który będzie rozwijał platformę onboardingową dla klientów instytucjonalnych. Rola wymaga połączenia bardzo mocnego backendu (Java) z doświadczeniem frontendowym (React), pracy w środowisku mikroserwisowym oraz dużego nacisku na jakość (TDD), UX oraz współpracę z biznesem i stakeholderami. Lokalizacja: Kraków, praca hybrydowa (2 dni z biura) . Zadania: Rozwój backendu w Javie (główna część pracy), Rozwój UI w React, Projektowanie i tworzenie nowych funkcjonalności, Testowanie i utrzymanie aplikacji, Współpraca ze stakeholderami i zespołem. Wymagania (must have): M inimum 5 lat doświadczenia w tworzeniu oprogramowania , Bardzo dobra znajomość Java (główna część pracy – backend) , Doświadczenie w pracy z React, JavaScript oraz TypeScript , Budowanie i rozwijanie aplikacji komponentowych (React / React Native) , Znajomość CSS3 oraz systemy designu i design tokens , Doświadczenie w pracy z JSON i XML (marshalling danych), Doświadczenie w testach front-endowych (Jest, Testing Library) , Praca zgodnie z zasadami Test Driven Development (TDD) , Dostarczanie rozwiązań wysokiej jakości i dbanie o standardy kodu, Doświadczenie w pracy ze stakeholderami i zrozumienie potrzeb biznesu, Język angielski na poziomie minimum B2 . Wymagania (nice to have): Doświadczenie w projektowaniu produktów cyfrowych w bankowości lub onboardingu , Doświadczenie z narzędziami developerskimi ( Git, IntelliJ, VSCode ), Doświadczenie w mentoringu zespołu i podnoszeniu standardów technicznych.

🏢 Summary: Hybrid Java Full Stack Developer role focused on modernizing enterprise systems and building scalable, cloud-native microservices and web applications using Java and React. The position involves migrating legacy platforms to API-driven architectures, enhancing automation, and improving system efficiency and scalability. Work includes backend and frontend development within containerized and Kubernetes-based environments. 🗂️ Requirements: Strong experience with Java 11+, Hands-on experience with Kubernetes, Experience with containerized environments, Proficiency with Git, Strong Unix/Linux command line skills, Experience with SQL databases, Knowledge of RESTful APIs, Understanding of microservices architecture, Familiarity with HTTP, Familiarity with JavaScript 📃 Skills: Java, React, Kubernetes, Git, Unix, Linux, SQL, Oracle, REST, HTTP, JavaScript, Spring, SpringBoot, Microservices, Docker 🏢 Description: We are looking for a skilled Java Full Stack Developer to join our team in Kraków. This is a hybrid role requiring 2 days per week onsite , offering the opportunity to work on modernizing enterprise systems and building scalable, cloud-native solutions. Key Responsibilities Design, build, and support scalable services, microservices, and applications (both backend and frontend) using Java (11/17/21) and modern web technologies such as React Contribute to the modernization of legacy systems, including migration from mainframe and IBM WebSphere to API-driven and microservices-based architectures Help reduce operational costs and system complexity through modern engineering practices Improve testing efficiency by implementing and expanding automated testing frameworks Enhance Straight-Through Processing (STP) capabilities across services and platforms Required Skills & Experience Strong experience with Java (11 or higher) ; experience with Java 17+ is highly preferred Hands-on experience with Kubernetes and containerized environments Proficiency with Git for version control Strong command of Unix/Linux systems and CLI tools Solid experience with databases and SQL (Oracle preferred) Good understanding of RESTful APIs and microservices architecture Familiarity with HTTP/web technologies and JavaScript Nice to Have Experience with Reactjs for frontend development Background working in a DevOps-oriented delivery team Knowledge of application monitoring and observability tools Experience with Spring / Spring Boot

🏢 Summary: Fullstack Developer role focused on building and maintaining web applications using Java on the backend and React on the frontend. The position involves API design, database integration, and unit testing to deliver robust, high-quality software. Candidates will work across the full stack, contributing to both development and code quality processes. 🗂️ Requirements: 2+ years of Java programming experience, Strong knowledge of SQL, Experience with API definition, Proficiency in Git, Experience with JUnit testing, Proficiency in React, Proficiency in Next.js 📃 Skills: Java, React, Next.js, SQL, API, Git, JUnit 🏢 Description: Introduction & Summary: We are seeking a skilled Fullstack Developer specializing in Java and React. The ideal candidate will have over 2 years of experience in Java programming along with a solid understanding of modern frontend frameworks. The role requires proficiency in SQL and API definition, as well as experience with Git and Junit, making it essential for creating robust applications. Main Responsibilities: The Fullstack Developer will take on a pivotal role in our development team, responsible for both backend and frontend tasks. Develop and maintain web applications using Java and React. Define and implement APIs for seamless integration. Collaborate with cross-functional teams to design and deliver software solutions. Conduct unit testing to ensure high-quality code. Utilize Git for version control and collaboration. Key Requirements: 2+ years of experience in Java programming. Strong knowledge of SQL. Experience with API definition. Proficiency in Git. Experience with Junit testing. Proficient in frontend frameworks - React and Next.js. Nice to Have: Experience with Kafka and Spring Kafka (very nice to have). Some experience in microservices development. Familiarity with MongoDB. Experience with Spring Data JPA.

🏢 Summary: Hybrid Java & React.js Developer role focused on building and maintaining scalable web applications, covering both backend services and modern frontend interfaces. The position involves developing RESTful APIs, implementing responsive UIs, and supporting integration and deployment through CI/CD pipelines. 🗂️ Requirements: Strong experience with Java, Solid experience with React.js, Experience building and consuming REST APIs, Strong knowledge of JavaScript, Strong knowledge of HTML, Strong knowledge of CSS, Experience with Git, Experience with CI/CD pipelines 📃 Skills: Java, React.js, JavaScript, HTML, CSS, REST, Git, CI/CD 🏢 Description: We are looking for an experienced Java & React.js Developer to join our development team in Kraków. In this role, you will work on building and maintaining scalable web applications, contributing to both backend services and modern frontend interfaces. This position follows a hybrid working model with two/three days per week onsite in Kraków . Key Responsibilities Develop and maintain backend services using Java Build responsive and modern user interfaces using React.js Design and implement RESTful APIs Collaborate with product managers, designers, and engineers to deliver new features Write clean, maintainable, and efficient code Participate in code reviews and contribute to development best practices Troubleshoot and resolve technical issues Support integration and deployment through CI/CD pipelines Required Skills and Experience Strong experience with Java Solid experience with React.js Experience building and consuming REST APIs Strong knowledge of JavaScript, HTML, and CSS Experience with Git and modern development workflows Familiarity with Agile development environments Good communication skills in English Nice to Have Experience with Spring Boot Experience with TypeScript Knowledge of SQL databases Familiarity with Docker or cloud platforms Work Model Hybrid: 2 days onsite in Kraków , remaining days remote.

🏢 Summary: Senior Fullstack Engineer role focused on designing and developing scalable, user-centric applications using Java and React in a hybrid Krakow-based environment. The position involves software architecture design, UI improvements, backend development, and DevOps-driven automation to enhance application stability and operational efficiency. The role supports digital transformation through robust system design and continuous service improvement. 🗂️ Requirements: Minimum 5 years of experience in Java production application development, Experience with front-end development using React, Strong proficiency in Java and Web API development, Experience in building secure and scalable backend services, Expertise in database design with PostgreSQL, Experience with T-SQL scripting, query optimization, performance tuning, Hands-on experience with CI/CD pipelines, Strong understanding of SDLC, Fluent English, Legal right to work in the European Union 📃 Skills: Java, React, WebAPI, PostgreSQL, T-SQL, SQL, CI/CD, DevOps, SDLC, AWS, Azure 🏢 Description: Unleash innovation by shaping the future of software architecture and user experience! Krakow-based opportunity with hybrid work model, offering flexibility and dynamic collaboration. As a Senior Fullstack Engineer – Java and React Development , you will be working for our client in the technology industry, focusing on designing scalable, efficient, and user-centric applications. You will contribute to creating cutting-edge solutions that enhance UX, application stability, and operational efficiency, supporting the digital transformation journey. Your main responsibilities: Participating in software architecture design to build robust systems. Leading UI enhancements and improvements to elevate user experience and application stability. Implementing solutions following best Design Patterns for maintainability and scalability. Analyzing requirements to fully understand solutions and recommending data-driven improvements. Creating comprehensive documentation for developed solutions to ensure clarity and knowledge sharing. Developing and testing application prototypes to validate concepts and designs. Managing changes through the Service Management lifecycle, ensuring smooth transitions. Contributing actively to automation initiatives and Service Management process improvements. Providing exceptional customer support by addressing issues promptly and effectively. Communicating with customers to understand needs and deliver tailored solutions. You're ideal for this role if you have: At least 5 years of professional experience in production applications development in Java, including front-end development with React. Strong proficiency in Java and Web API development, with a focus on building secure, scalable backend services. Expertise in database design, particularly with PostgreSQL, T-SQL scripting, query optimization, and performance tuning. Hands-on experience with DevOps practices like CI/CD pipelines. Deep understanding of the Software Development Life Cycle (SDLC), from requirements gathering to deployment and maintenance. Exceptional problem-solving skills with keen attention to detail, ensuring high-quality deliverables. It is a strong plus if you have: Experience with cloud platforms (e.g., AWS, Azure). Certifications in Java, React, or DevOps tools. Language Required for the role: Fluent English, with excellent communication skills. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: B2B role for an experienced Full-stack Developer (Java/React) to build and maintain Data Lake, Data Warehouse and "chat with data" solutions, covering both backend services and frontend components. The position involves designing data models, building data pipelines (on-prem and GCP), optimizing SQL queries, and developing conversational web applications end-to-end. Work is performed in a DevSecOps model with responsibility for CI/CD, monitoring and production support. 🗂️ Requirements: Experience with React, Experience with Java and API development, Experience building conversational web applications (chat, streaming, history, feedback, sources), Knowledge of BigQuery and SQL, Experience in data modeling (logical and physical), Experience building data pipelines (on-prem and cloud), SQL query optimization skills, Experience with Git and code review, Experience writing unit, integration and e2e tests, Experience with CI/CD pipelines, Experience with monitoring and logging, Experience in incident handling and production support, Ability to design data-focused UI (tables, charts, drill-down, export) 📃 Skills: Java, React, SQL, BigQuery, GCP, CloudRun, PubSub, Docker, Kubernetes, Git, CI/CD, DevSecOps, APIs, DataLake, DWH 🏢 Description: Poszukujemy doświadczonego Full-stack Developera (java/react), który dołączy do zespołu rozwijającego nowoczesne rozwiązania w obszarze Data Lake, DWH oraz „chat with data”. Praca obejmuje zarówno rozwój backendu, jak i współpracę przy projektowaniu interfejsów oraz komponentów frontendowych. Oferujemy Długoterminowa współpraca w oparciu o kontrakt B2B Prywatna opieka medyczna Karta multisportowa Udział w nowoczesnych projektach Praca hybrydowa – min. 1 dzień w tygodniu w biurze (Poznań lub Warszawa) Obowiązki Budowa i rozwój rozwiązań Data Lake i Data Warehouse (online/offline) Projektowanie i implementacja procesów zasilania danych Modelowanie danych (logiczne i fizyczne) Optymalizacja zapytań SQL (on-prem i GCP) Tworzenie pipeline’ów danych (on-prem oraz chmura GCP) Rozwój narzędzia „chat with data” (end-to-end) Współpraca przy projektowaniu rozwiązań IT zgodnych z wymaganiami biznesowymi Obsługa incydentów i rozwiązywanie problemów produkcyjnych Wsparcie testów i wdrożeń Utrzymanie i serwisowanie systemów Praca w modelu DevSecOps Wymagania Znajomość frontend’u: React Doświadczenie w budowie aplikacji webowych z elementami konwersacyjnymi (chat), w tym: streaming odpowiedzi historia rozmów feedback użytkownika prezentacja źródeł i uzasadnień Doświadczenie backendowe: Java – projektowanie i rozwój usług API Podstawowa znajomość BigQuery / SQL Umiejętność projektowania ergonomicznego UI dla danych: tabele, wykresy, drill-down, eksport wyników Doświadczenie w pracy zespołowej: Git, code review, standardy jakości, dokumentacja testy (unit / integration / e2e) Doświadczenie produkcyjne: CI/CD, monitoring, logowanie reagowanie na incydenty Gotowość do współpracy z AI Engineerami i zespołami data: kontrakty API, formaty danych, walidacje, optymalizacja kosztów Mile widziane Znajomość rozwiązań typu semantic / metrics layer (caching, pre-aggregations, governance metryk) Doświadczenie z narzędziami „conversational analytics” / „chat with data” Znajomość bibliotek UI i data visualization GCP: Cloud Run, Pub/Sub Docker / Kubernetes Doświadczenie w środowisku regulowanym (np. bankowość) Ta rola nie jest dla Ciebie, ale masz znajomego, który by się sprawdził? Poleć go i zgarnij nawet 5000 zł. Referral Program: Talent from your network Nie zwlekaj i zaaplikuj już teraz! Nr ref.: 30/4/2026/r/3382