Senior Java Fullstack Developer

Our client — a global leader in healthcare and diagnostics — is building a new prenatal screening diagnostics product from the ground up.

We are looking for a senior backend‑heavy fullstack engineer who can own features end‑to‑end — from data modeling and APIs to the UI. The role offers real ownership within a highly regulated, impact‑driven product environment.

Using AI tooling as a core part of daily engineering work is expected — not as an experiment, but as a standard way of building and delivering software.

What You'll do:

• Own features end-to-end: design, implement, test, deploy, and maintain across the full stack. Work split ~80% backend, 20% frontend.

• Make foundational architectural decisions on a greenfield codebase — data models, API contracts, service boundaries, test strategy

• Build and maintain the Java/Spring Boot backend that powers the product's core logic

• Contribute to the React/TypeScript frontend when needed — you're backend-primary, but you ship UI when the team needs it

• Integrate AI coding tools into your daily workflow to accelerate delivery while maintaining code quality — and help the team adopt these practices

• Collaborate directly with product stakeholders to refine requirements in a fast-moving, low-ceremony environment

Requirements:

• Strong Java and Spring Boot expertise — clean API design, domain modeling, sound architectural trade-offs. You think in terms of service boundaries, data flow, and maintainability, not just making it work

• Solid grasp of software design principles — object-oriented programming, SOLID, clean architecture, separation of concerns. You write code that the next person can read, extend, and trust. You know when a pattern helps and when it's ceremony

• Working proficiency in React and TypeScript — you can pick up frontend tasks, build components, and integrate with backend APIs independently

• Proven experience integrating AI coding tools (Claude Code, Cursor, or equivalent) into daily development workflow — including prompt design for code generation, output validation, and actively preventing AI-generated technical debt. You can describe concrete examples of where AI accelerated your delivery and where you chose to override it

• Testing as a professional discipline, not a checkbox — you write unit, integration, and API tests as part of delivery, own the test pyramid decisions, and treat untested code as unfinished code

• PostgreSQL — schema design, query optimization, migrations in a production context

• AWS experience — you've deployed and operated production workloads on AWS (ECS/EKS, RDS, Lambda, S3) and can make informed infrastructure decisions

• Comfort working in ambiguous, greenfield settings — you define scope with stakeholders rather than waiting for pre-scoped tickets

Nice-to-Have:

• Infrastructure as Code (Terraform)

• Healthcare, diagnostics, or regulated-environment experience

• Security hardening practice — threat modeling, dependency scanning, secure defaults

• Observability tooling (CloudWatch, Prometheus, Grafana)

• CI/CD pipeline design (GitHub Actions or similar)

Our offer:

• Permanent full-time contract (B2B contract)

• Ability to work entirely remotely or in one of our cool offices around Poland

• International project environment - challenging and rewarding projects

• Access to private medical service, life insurance, and multisport card

• Access to training and certificate courses (including free access to Udemy training platform)

• Cafeteria Benefits System - vouchers for purchases and sevices

• Awesome company events and parties