Senior Full Stack Developer

Luxoft Poland; Kraków; On-site; PLN 180,000 - 240,000; Full time

Job summary

Luxoft Poland is seeking a Senior Full-Stack Developer (Java + React) to help build an AI-enabled application platform for an investment banking client. You will design scalable back-end services with Java/Spring Boot and craft responsive front-end with React and TypeScript.

You'll leverage AI-assisted tools like GitHub Copilot, implement generative AI features, and contribute to robust CI/CD pipelines while mentoring teammates and aligning with agile practices.

Qualifications

• At least 8 years of professional software development experience.
• Strong hands-on experience with Java (Java 11+) and Spring / Spring Boot.
• 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 into applications.
• Familiarity with CI/CD pipelines and Git-based workflows.
• Excellent problem-solving skills.
• Familiarity with agile practices (Scrum, Kanban, etc.).
• Good communication skills and the ability to state requirements clearly to other teams.

Responsibilities

• Design, develop and maintain scalable back-end services and APIs using Java (Spring Boot).
• Build responsive front-end applications using React and TypeScript.
• Use AI-assisted development tools to speed up delivery while maintaining quality and security.
• Design and integrate generative AI features, including prompt engineering and LLM integration.
• Define and consume RESTful APIs and communicate requirements across teams.
• Mentor the team on architecture and best practices, including responsible AI use.
• Lead code reviews and pair programming to raise technical level.
• Translate business requirements into end-to-end technical solutions.
• Apply clean code principles and improve CI/CD pipelines and tooling.
• Write and maintain automated tests (unit, integration, E2E).
• Participate in Scrum/Kanban ceremonies and collaborate with QA and product teams.

Skills

Java

Spring Boot

React

TypeScript

REST APIs

GitHub Copilot

AI/Generative AI

Agile

Scrum

Kanban

Tools

GitHub Copilot

OpenAI

Azure OpenAI

Job 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

Must have

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

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

Familiarity with CI/CD pipelines and Git-based workflows

Excellent problem-solving skills

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

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

Nice to have

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

Experience in investment banking or capital markets

Exposure to RAG architectures, vector databases or AI agent frameworks

Working knowledge of Unix/Linux and shell scripting