Full Stack Engineer (Java & React)

Quick Facts

• Role: Full Stack Engineer (Java & React)
• Team: Global Asset Servicing Platform

Description

Design, build, and test features end-to-end with full ownership of code quality. Develop backend functionality in Java and modern responsive frontends with React, while contributing to test automation using unit/integration tests and Cucumber end-to-end tests (with Ruby step definitions). The role emphasizes test-first delivery, performance/scalability awareness, and production-ready logging/instrumentation.

Responsibilities

• Design, develop, and maintain features using Java and React
• Build responsive modern frontend applications using React
• Develop and integrate APIs and web services
• Work with relational databases (Oracle, PostgreSQL)
• Write clean unit tests (JUnit or equivalent) alongside implementation
• Contribute to the automated test framework using Ruby and Cucumber
  • Write Ruby step definitions as needed
  • Create and maintain Cucumber feature files for end-to-end testing
• Write automated tests for features developed by other engineers to reduce development bias
• Champion a test-first approach (reliable, maintainable, scalable code)
• Apply performance and scalability considerations; use JMeter or similar tools when required
• Embed instrumentation, configuration, and logging to support monitoring and support
• Analyze and debug issues using logs; propose and implement fixes
• Collaborate in Agile ceremonies to deliver clear sprint goals
• Partner with product managers and analysts to deliver functional and non-functional needs

Requirements

• Proficiency in Java (including strong JUnit testing experience)
• Proficiency in React (including associated unit testing frameworks)
• Familiarity with Ruby scripting for test step definitions
• Experience with Cucumber for end-to-end testing
• Strong understanding of multi-threading, parallel processing, and real-time messaging
• Experience with test-first design and CI/CD practices
• Ability to use JMeter or similar tools for performance testing (plus)
• Practical awareness of cloud services (databases, servers, storage, gateways)
• Use AI-assisted engineering tools (e.g., GitHub Copilot or ChatGPT) while maintaining critical thinking and code quality
• Familiarity with financial markets concepts; corporate actions lifecycle knowledge preferred

Benefits

• Hybrid B2B cooperation, with an option to provide services from the Warsaw office as agreed based on project needs
• Recruitment process: HR interview, technical interview, client interview, feedback and offer