Full Stack Engineer (Java & React)

Capco

Warsaw, Poland

On-site

Who this role is best for

Best suited to candidates with hands-on Java and React experience working in financial services, particularly in asset servicing and corporate actions.

Best fit for

Candidates with Java and React expertise who can balance immediate delivery with long-term maintainability
— “Build with a product mindset – appreciating client impact, configurability, and long-term supportability.”
Individuals comfortable with test-first development and contributing to end-to-end testing frameworks
— “Champion a test-first approach, delivering code that is reliable, maintainable, and scalable.”
Candidates familiar with financial markets concepts and the corporate actions lifecycle
— “Knowledge of corporate actions lifecycle preferred.”

Things to consider

The role requires in-office presence in Warsaw to some extent based on project needs
— “B2B cooperation in a hybrid model, with the option to provide services from the Warsaw office to the extent agreed based on project needs.”
Candidates must be prepared to write and maintain Cucumber-based end-to-end tests
— “Contribute to and maintain our automated test framework using Ruby and Cucumber.”

How to stand out

Highlight experience with Java and React in the context of financial applications on your resume
— “This role will work across the full stack to build a scalable, reliable, and user-friendly application.”
Showcase your ability to write unit and integration tests alongside your code
— “Write clean, well-structured unit tests (JUnit or equivalent) alongside your code.”
Demonstrate familiarity with financial domain concepts and corporate actions in interviews
— “Familiarity with financial markets concepts.”
Demonstrate your ability to debug and analyze issues using logs and testing tools
— “Analyse and debug issues using logs; propose and implement fixes.”

Pace · Fast PacedCollaboration · HighAutonomy · MediumDecision Impact · Team

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

design, develop, and maintain features using Java and React
build responsive and modern frontend applications
develop and integrate APIs and web services
write clean, well-structured unit tests

Typical background

Java and React development experience

Skills & requirements

Required

Java Backend DevelopmentReact Frontend DevelopmentAPI And Web Services IntegrationUnit And Integration TestingCucumber-based End-to-end TestingAgile Methodologies

Preferred

Ai-assisted Engineering ToolsPerformance Testing With Jmeter

Stack & domain

JavaReactAPI DevelopmentWeb ServicesRelational DatabasesUnit TestingIntegration TestingEnd-to-end TestingRuby ScriptingCucumberPerformance TestingCloud ServicesAi-assisted Engineering ToolsCollaborationProblem-solvingCuriosityProactivityContinuous LearningFinanceTechnology

About the role

Original posting from Capco via Greenhouse

CAPCO POLAND - WARSAW
*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 for step definitions
Cucumber for end-to-end testing
Strong understanding of:
Multi-threading, parallel processing, and real-time messaging
Test-first design, CI/CD practices
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.
Recruitment Process:
HR Interview with the recruiter
Technical Interview
Client Interview
Feedback and offer
#LI-HYBRID

Source: Capco careers (Greenhouse)