Back-end Software Engineer

About the Role 
We're looking for a  Backend Developer to design and build the backend of our products - REST APIs, services, and AI integrations from data model to production. You'll own features end-to-end, contribute to architectural decisions, and occasionally jump into the React frontend when it makes sense.

What You'll Do

• Design, build, and maintain backend services and REST APIs for our products - from data model through to production.
• Integrate AI / LLMs into product features.
• Design and implement clean, well-documented REST APIs (contract-first where it fits).
• Write maintainable, testable code with strong unit and integration test coverage.
• Take part in code reviews, both giving and receiving constructive feedback.
• Collaborate closely with product managers, designers, frontend engineers, and QA in an Agile team.
• Investigate and resolve bugs, and help improve performance and reliability.
• Contribute to technical and architectural decisions.
• (A plus) Occasionally contribute to the React frontend when a feature spans the stack.
   

What We're Looking For

Must-have (backend):

• 3+ years of commercial backend development experience in Java.
• Strong Java Core; hands-on experience with Spring Boot (Spring MVC, Spring Data JPA, Hibernate), Spring Security, and Spring AOP.
• Familiarity with MapStruct for entity-to-DTO mapping and Lombok.
• Practical experience designing and consuming RESTful services.
• Good SQL skills with a relational database (PostgreSQL); schema migrations with Flyway.
• Understanding of OAuth2 / JWT-based authentication and role-based access control.
• Comfortable with Docker and Docker Compose.
• Confident with Git and a standard branching workflow; familiarity with Gradle.
• Experience writing unit and integration tests (JUnit, Testcontainers).
• Genuine interest in integrating AI / LLMs into product features.
• Solid understanding of OOP, web fundamentals, and clean-code principles.
• English at Upper-Intermediate (B2) level - able to communicate in writing and on calls.
   

A big advantage:

• Frontend experience with React - JavaScript/TypeScript, HTML, CSS/SCSS, and the modern React ecosystem: client state (Zustand), server state / data fetching (TanStack Query), routing (React Router), and a modern build tool (Vite).
• Hands-on experience integrating AI / LLMs into real product features.
• Contract-first / OpenAPI workflow - OpenAPI 3 with code generation (openapi-generator).
• Experience integrating an identity provider such as Keycloak.
• AWS exposure (EC2, RDS, CloudWatch) and structured (JSON) logging.
• End-to-end testing with Playwright.