Senior Java/React Full-Stack Engineer — AI Platform

Luxoft Germany; Kraków; Hybrid; PLN 240,000 - 320,000; Full time

Job summary

Luxoft Germany is seeking a senior Full-Stack Developer (Java + React) to join a client team building a new AI-enabled application platform in the investment banking domain. You will design and implement scalable back-end services with Java/Spring Boot and rich front-end with React/TypeScript, integrating AI features and maintaining high-quality delivery.

The role emphasizes clean code, agile methods, mentoring, and collaboration with QA, product managers, and architects to deliver end-to-end

Qualifications

• 8+ years of professional software development experience.
• 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.
• Hands-on experience with GitHub Copilot or AI coding assistants.
• Knowledge of generative AI, prompt engineering, and integrating LLM APIs.
• Strong SQL and relational database skills.
• Experience in automated testing (JUnit, Jest, RTL).
• Familiarity with CI/CD pipelines and Git-based workflows.
• Clean coding skills and problem-solving ability.
• Familiarity with agile practices (Scrum, Kanban).
• Good communication across teams.

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 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 on both front end and back end.
• Participate in agile ceremonies (Scrum/Kanban), refinement, planning, reviews and retrospectives.
• Work with QA, product managers, architects and stakeholders to deliver high-quality work.

Skills

Java

Spring Boot

React

TypeScript/JavaScript

HTML/CSS

REST APIs

SQL

Automated testing

CI/CD

Agile practices

AI coding tools

Gen AI / Prompt engineering

Communication

Code reviews

Tools

GitHub Copilot

Job description

Luxoft Germany is seeking a senior Full-Stack Developer (Java + React) to join a client team building a new AI-enabled application platform in the investment banking domain. You will design and implement scalable back-end services with Java/Spring Boot and rich front-end with React/TypeScript, integrating AI features and maintaining high-quality delivery.

The role emphasizes clean code, agile methods, mentoring, and collaboration with QA, product managers, and architects to deliver end-to-end