Senior Full-Stack Engineer - Java/Spring + React + AI

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

Benefits offered by this job

Private Medical Insurance

Dental Insurance

Life Insurance

Internal mobility program

Job summary

Luxoft in Kraków is seeking a senior Full-Stack Developer (Java + React) to help build a new AI-enabled platform for investment banking. You will design scalable back-end services with Java Spring Boot and build responsive front-ends with React and TypeScript, aligning with agile practices.

You will leverage AI-assisted tools like GitHub Copilot, integrate LLMs, write tests, mentor teammates, and collaborate across QA, product managers, and architects to deliver high-quality solutions.

Qualifications

• 8+ years of professional software development experience, including long-term projects.
• Strong hands-on experience with 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.
• 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.
• Excellent problem-solving and communication skills; familiarity with agile practices.

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 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 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 improve engineering standards, tooling and CI/CD pipelines.
• Write and maintain automated tests (unit, integration, end-to-end).
• Take an active part in agile ceremonies (Scrum/Kanban).
• Work closely with QA, product managers, architects and stakeholders to deliver high-quality work.
• Support and improve existing applications in a fast-paced enterprise investment-banking environment.

Skills

Java (11+)

Spring Boot

Full-stack development

React & TypeScript

AI coding assistants

Generative AI / LLM

SQL / Relational databases

Automated testing

CI/CD pipelines

Agile methodologies

Job description

Luxoft in Kraków is seeking a senior Full-Stack Developer (Java + React) to help build a new AI-enabled platform for investment banking. You will design scalable back-end services with Java Spring Boot and build responsive front-ends with React and TypeScript, aligning with agile practices.

You will leverage AI-assisted tools like GitHub Copilot, integrate LLMs, write tests, mentor teammates, and collaborate across QA, product managers, and architects to deliver high-quality solutions.