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Fullstack Developer (Java + React)

Technology
B3 Consulting Poland
Warszawa, Polska2 tygodni temuDo 18.12.2026
Pełny etatHybrydowa

Opis stanowiska

What we offer

  • Work in a Scandinavian culture built on logic, trust, and open dialogue.

  • Health and sports benefits tailored to your needs.

  • Speed Coaching – short sessions designed to provide new perspectives and solutions.

  • Sports training, an internal team, and opportunities to take part in competitions.

Areas of responsibility:
  • Developing a new application processing very large volumes of financial data - building features with Java, Spring Boot and React in a fast-growing internal project

  • Implementing business modules for the investment fund market - handling ETF funds, edge cases such as settlement fees, and payment reconciliation processes

  • Working on both new feature development and maintenance of a live production system - incident handling and support for active users, in self-contained tasks that do not require knowledge of the entire architecture upfront

What you need to join us:

Must have:

  • 5 years of commercial experience with Java, including building applications with Spring Boot

  • 5 years of experience working with React

  • Experience with Docker and hands-on knowledge of SQL and working with large databases

  • Experience working in Agile teams

  • English at B2 /C1 level as the main language of daily collaboration, and readiness for hybrid work in Warsaw (1-2 days per week)

  • Eligibility to work in Poland (citizenship, residence card, visa, etc.)

Nice to have:
  • Experience in the financial domain - investment funds, ETFs, settlements, reconciliation processes

  • Experience in projects with large data volumes and high performance requirements

  • Experience collaborating with a distributed, international team and business stakeholders

  • Experience combining production system maintenance with new feature development

Keywords
JavaSpring BootSQLReactDockerReactOSSpring FrameworkReact.js

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