April 8, 2026

Java Fullstack Developer (Java/React)

Senior • Remote

120 - 160 PLN

Warsaw, Poland

Tasks:

  • Designing, developing, and maintaining the server-side logic of web applications. Implementing scalable and efficient server-side components and APIs.

  • Build React/Next.js based applications.

  • Working with relational and/or NoSQL databases to store and retrieve data efficiently. Designing and optimizing database schemas for performance and scalability.

  • Integrating third-party APIs and web services to enhance application functionality. Developing custom APIs to facilitate communication between front-end and back-end systems.

  • Implementing security best practices to protect against common web application vulnerabilities. Conducting regular security audits and implement necessary measures.

  • Optimization: optimizing server-side code for maximum speed and scalability. Monitoring and troubleshooting performance issues.

  • Collaborating with front-end developers, UI/UX designers, and other team members to ensure seamless integration of components.

  • Using version control systems (e.g., Git) to manage and track changes to the codebase.

  • Conducting thorough testing of server-side components to identify and fix bugs.

  • Collaborating with QA engineers for comprehensive testing.

  • Clear and comprehensive documentation for back-end systems and APIs.

Requirements:

  • At least 4 years of experience in a similar position.

  • Proficiency in Java server-side programming.

  • Thorough understanding of React/Next.js core principles along with React router, hooks, Redux (or the like) workflows, Web performance and security.

  • Experience with database systems (e.g., MySQL, PostgreSQL, MongoDB).

  • Proven experience in back-end development and building scalable web applications.

  • Familiarity with cloud platforms (e.g., AWS, Azure, GCP) is a plus.

  • Previous experience in Front-end development with Docker is plus.

  • Experience with NodeJS is a plus.

  • Strong analytical and problem-solving skills with attention to detail.

  • Effective communication skills to collaborate with cross-functional teams.

  • Ability to adapt to changing project requirements and technologies.

  • English at least B2.

Offer:

  • Stable employment. On the market since 2008, 1500+ talents currently on board in 7 global sites.

  • “Office as an option” model. You can choose to work remotely or in the office.

  • Great Place to Work® certified employer.

  • Flexibility regarding working hours and your preferred form of contract.

  • Comprehensive online onboarding program with a “Buddy” from day 1.

  • Cooperation with top-tier engineers and experts.

  • Unlimited access to the Udemy learning platform from day 1.

  • Internal Gallup Certified Strengths Coach to support your growth.

  • Certificate training programs. Lingarians earn 500+ technology certificates yearly.

  • Upskilling support. Capability development programs, Competency Centers, knowledge sharing sessions, community webinars, 110+ training opportunities yearly.

  • Grow as we grow as a company. 76% of our managers are internal promotions.

  • A diverse, inclusive, and values-driven community.

  • Autonomy to choose the way you work. We trust your ideas.

  • Create our community together. Refer your friends to receive bonuses.

  • Activities to support your well-being and health.

  • Plenty of opportunities to donate to charities and support the environment.

  • Modern office equipment. Purchased for you or available to borrow, depending on your location.

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