Java/React Fullstack Developer (Banking)

Capco; Województwo mazowieckie; Hybrid; PLN 180,000 - 300,000; Full time

Job summary

Capco Poland is seeking a hands-on React/Java Full Stack Engineer to join the Global Asset Servicing Platform. You will design, build, and test features end-to-end with full ownership of code and quality.

The ideal candidate will work across backend Java and frontend React, API development, and test automation using Ruby and Cucumber in an Agile squad. The role offers hybrid work with possible Warsaw office collaboration.

Qualifications

• Proficiency in Java and React with strong unit testing experience.
• Familiarity with automation frameworks and languages (Ruby, Cucumber).
• Experience with performance testing tools (JMeter).
• Understanding of cloud services and practical hosting environments.
• Experience using AI-assisted engineering tools to accelerate coding and testing.

Responsibilities

• Design, develop, and maintain features using Java and React.
• Build responsive frontend applications with ReactJS.
• Develop and integrate APIs and web services.
• Write clean unit tests alongside code (JUnit).
• Contribute to automated test framework using Ruby and Cucumber.
• Write Ruby step definitions and Cucumber feature files for end-to-end tests.
• Write automated tests for features developed by others to ensure quality.
• Adopt a test-first approach and ensure scalable, maintainable code.
• Apply performance considerations with tools like JMeter when needed.
• Ensure instrumentation, configuration, and logging for monitoring.

Skills

Java

React

Ruby scripting

Cucumber

JUnit testing

JMeter

Cloud services

Multi-threading

AI-assisted engineering tools

Tools

JUnit testing framework

Ruby

Job description

*We are looking for Poland based candidate.

At Capco Poland, we’re not just another consultancy - we’re the spark behind digital transformation in the financial world. As a global leader in technology and management consulting, we thrive on helping clients tackle the toughest challenges across banking, payments, capital markets, wealth, and asset management.

Role Overview

We are seeking React / Java Full Stack Engineer to join our Global Asset Servicing Platform team. This is a hands‑on engineering role where you will design, build, and test features end‑to‑end – with full ownership of code and quality.

You will work across development and test automation: coding new functionality, writing unit and integration tests, and adding Cucumber‑based end‑to‑end tests – not only for your own work but also for features built by your teammates, to ensure unbiased validation.

The ideal candidate will be skilled in Java backend development and modern UI development using React. This role will work across the full stack to build a scalable, reliable, and user‑friendly application.

Key Responsibilities

• Design, develop, and maintain features using Java and React.
• Build responsive and modern frontend applications using ReactJS,
• Develop and integrate APIs and web services.
• Experience working with relational databases (Oracle, Postgres)
• Write clean, well‑structured unit tests (JUnit or equivalent) alongside your code.
• Contribute to and maintain our automated test framework using Ruby and Cucumber:
• Write new 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, ensuring high‑quality outcomes and reducing development bias.
• Champion a test‑first approach, delivering code that is reliable, maintainable, and scalable.
• Apply performance and scalability considerations; use tools such as JMeter for load/performance testing where required.
• Ensure instrumentation, configuration, and logging are embedded in code to support ongoing monitoring and support.
• Analyse and debug issues using logs; propose and implement fixes.
• Collaborate in Agile ceremonies, helping the squad plan effectively and commit to clear sprint goals.
• Partner with product managers and analysts to understand what is being built, why it matters, and how best to implement it for both functional and non‑functional needs.
• Build with a product mindset – appreciating client impact, configurability, and long‑term supportability.

Skills & Experience

Technical Skills

• Proficiency in:
• Java (with strong JUnit testing experience)
• React (with associated unit testing frameworks)
• Familiarity with automation frameworks & languages:
• Ruby scripting (nice to have) for step definitions
• Cucumber for end‑to‑end testing
• Strong understanding of:
• Multi‑threading, parallel processing, and real‑time messaging
• Ability to use JMeter or similar tools for performance testing (a plus)
• Basic understanding of cloud services: databases, servers, storage, gateways (not at architect level, but practical awareness of hosting environments).
• Experience using AI‑assisted engineering tools (such as GitHub Copilot, ChatGPT, or similar) to accelerate coding, testing, debugging, and documentation, while maintaining code quality and critical thinking.

Functional / Domain Knowledge

• Familiarity with financial markets concepts.
• Knowledge of corporate actions lifecycle preferred.

Soft Skills

• Strong analytical and debugging abilities.
• Clear communicator, able to articulate trade‑offs and solutions to both technical and business audiences.
• Collaborative team player, comfortable working in agile, cross‑functional squads.
• Curious and thoughtful: able to look beyond the ticket to understand requirements, impact, and broader context.
• Product mindset — balancing immediate delivery with long‑term maintainability and client impact.

B2B cooperation in a hybrid model, with the option to provide services from the Warsaw office to the extent agreed based on project needs.