Senior Fullstack Developer (Java + React)

Salary: 1200-1500 pln/md on B2B Remote: Elastic hybrid from Gdynia/Warszawa/Rzeszów/Kraków (1-2 days per week from the office)   Why choose this offer? Be part of the digital transformation of financial markets Strong full-stack exposure - ability to work across frontend, backend, and infrastructure layers Quality-driven engineering culture Opportunity to explore AI-assisted development workflows and integrate AI tools into products   Project You will join a Digital Development Team responsible for building and evolving a client-centric platform serving both internal and external users. The platform supports onboarding and membership processes, as well as listing and post-listing activities for issuers. It acts as a central digital framework used across multiple strategic digital initiatives within the organization. As a Senior Fullstack Developer, you will be responsible for designing, developing, and maintaining software products within this digital platform domain.   Expected competences and knowledge At least 4 years of experience as a Full Stack Software Engineer Strong understanding of modern development paradigms: service-oriented architecture, REST APIs, domain-driven design, and event-driven architecture Full-stack mindset with the ability to move across frontend, backend, and infrastructure Quality-oriented approach - unit testing, test automation, and awareness of security, performance, and stability Experience working in DevOps-oriented environments with shared operational responsibility Ability to design and implement scalable and maintainable systems Interest in AI-assisted development and integrating AI tools into engineering workflows   Responsibilities you'll have Design, develop, and maintain full-stack solutions using Java, Spring Boot, React, Redux, and TypeScript Build and evolve RESTful and GraphQL APIs in a service-oriented and event-driven architecture Contribute to cloud-native solutions on AWS (ECS, SQS, SNS, S3, AuroraDB, Lambda, AppSync) Work with relational and NoSQL databases (Oracle, MySQL, PostgreSQL, DynamoDB) Implement messaging and event-driven communication using Kafka, SQS, Solace Apply caching and search solutions (Redis, Hazelcast, Solr, Elasticsearch) Ensure high code quality through unit testing and frontend testing frameworks (Jest, React Testing Library, Playwright) Contribute to AI-assisted development workflows and integration of AI tools into engineering processes Collaborate closely with DevOps in infrastructure, deployment, and operational excellence Participate in architectural discussions and continuously improve scalability, performance, and maintainability   Technologies you'll work with Java Spring Boot and Spring ecosystems React Redux TypeScript Frontend testing AWS APIs (REST, GraphQL) SQL (Oracle, My SQL, PostgreSQL) NoSQL (DynamoDB) Redis, Memcache, Hazelcast Solr, Elasticsearch Protobuf, Avro, JSON, POF   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.