Senior Full-Stack Developer (React + Java)

Senior • Hybrid

20,000 - 27,300 PLN

Gdynia, Poland

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 with 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.

Jit Team

Jit Team is a Polish company that operates in the IT industry, focusing on creating highly specialized teams for clients worldwide. With over 700 experienced experts, Jit Team emphasizes the human factor in IT, prioritizing people and their development. The company is deeply committed to its philosophy of "The Human factor of IT," which is reflected in its charitable and educational activities, such as supporting students with learning equipment and offering internships to launch IT careers. Jit Team has been active for over 15 years and is known for its strong relationship with a leading financial group in the Nordic countries, serving as their premier partner in Poland. The company values work-life balance, feedback culture, and international collaboration, often working in teams that provide exposure to the English language. Jit Team is also involved in supporting local initiatives, ensuring the circulation of positive energy within the community.

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