Full Stack Engineer (Java, React)

Project Description:

We're looking for a senior Full-Stack Developer (Java + React) to join our client's team and help build a new AI-enabled application platform. The team works with modern AI-assisted tools such as GitHub Copilot and generative AI, and cares about clean code, agile methods and high-quality delivery. The client is in the investment banking industry, and the platform supports collateral and margin management.

Responsibilities:

Design, develop and maintain scalable back-end services and APIs using Java (Spring Boot)

Build responsive, high-performance front-end applications using React and TypeScript

Use AI-assisted development tools such as GitHub Copilot to speed up delivery while keeping quality and security high

Design and integrate generative AI features into business applications, including prompt engineering, LLM integration and evaluation of model outputs

Define and consume RESTful APIs, and communicate requirements and constraints clearly across teams

Advise and guide the team on architecture, design decisions and best practices, including the responsible use of AI tools

Mentor developers and raise the team's technical level through code reviews and pair programming

Translate business and product requirements into robust end-to-end technical solutions

Apply clean code principles and help improve engineering standards, tooling and CI/CD pipelines

Write and maintain automated tests (unit, integration, end-to-end) on both front end and back end

Take an active part in agile ceremonies (Scrum/Kanban), including refinement, planning, reviews and retrospectives

Work closely with QA, product managers, architects and business stakeholders to deliver high-quality work that fits business needs

Support and improve existing applications in a fast-paced, enterprise investment-banking environment

Mandatory Skills Description:

At least 8 years of professional software development experience, including long-term projects

Strong hands-on experience with Java (Java 11+) and Spring / Spring Boot

Strong hands-on experience with React, TypeScript/JavaScript, HTML and CSS

Proven experience delivering full-stack features end to end, from UI to back-end services and the database

Hands-on experience with GitHub Copilot or similar AI coding assistants in daily development

Practical knowledge of generative AI and prompt engineering, including integrating LLM APIs (e.g. OpenAI, Azure OpenAI) into applications

Strong SQL skills and experience with relational databases

Experience in automated testing (JUnit, Jest, React Testing Library or similar)

Familiarity with CI/CD pipelines and Git-based workflows

Clean coding skills

Excellent problem-solving skills

Familiarity with agile practices (Scrum, Kanban, etc.)

Good communication skills and the ability to state requirements clearly to other teams

(Opportunity for Poland-based candidates)

Benefits:

💼 Tax-deductible costs on a contract of employment for all development roles

🔒 Stable employment based on an employment contract

🩺Private Medical & Dental care & Life Insurance

💰 Paid Referrals

🏋🏽 MyBenefit program (sports card, well-being program etc.)

🌎 Internal Mobility program - possibility of rotation between projects, locations, accounts

🎓 LuxTalent platform (webinars, training, courses)