Senior Full Stack Python Engineer

Do you want to build a great platform that is the core of an innovative health-tech operation and will impact the wellbeing hundred of thousands, if not millions of people? Tell us what you need to make it happen! The more successful we are, there more people we will help lead healthier, happier lives!

Wellis is a fast-growing healthtech scale-up that is reinventing one of the most traditional sectors: healthcare. What started just three years ago has already grown into a company with tens of thousands of customers, and we are only at the beginning. By combining medical expertise with technology and data, we make healthcare smarter, more efficient, and more personal.

Our mission is to improve everyday lives by making care accessible, personal, and seamless. Through our platform, people can take control of their health journey with trusted medical support, smart digital tools, and tailored programs. We move fast, challenge conventions, and build solutions that truly make an impact, because we believe better healthcare should be within everyone's reach.

You will be a core member of the Core Platform & API squad, working directly on the engine that powers every part of the Wellis platform. You'll build and maintain the PostgreSQL database layer, design and implement FastAPI endpoints, write the business logic for prescription and medication workflows, and contribute to the IAM and signing infrastructure that makes our card-free architecture possible.

This is not a role where you build CRUD endpoints and move on. The data you handle is patient medication records. The APIs you build are consumed by pharmacists making clinical decisions. The signing workflows you contribute to have legal force. You need to care about correctness, security, and reliability at a level most backend roles never demand.

• Experience with Supabase or similar BaaS platforms (Firebase, Appwrite) — understanding how managed auth and RLS work at scale.

• Healthcare data standards: HL7 FHIR, MP9, clinical terminologies. Not required at hire, but willingness to learn is essential.

• Experience with integration/orchestration platforms (Workato, Make, n8n, Zapier) — understanding event-driven architectures and data sync patterns.

• Familiarity with HSM-based signing, certificate management, or cryptographic operations.

• Working knowledge of GDPR, NEN 7510, or equivalent data protection frameworks.

• Dutch and/or German language skills (business English is the working language).

• You take ownership of the systems you build — from database schema through API through deployment through monitoring.

• You write code for the next person, not just for yourself. Clear naming, documentation, and testability matter to you.

• You're comfortable working in a small team where your decisions have outsized impact. No hiding behind process.

• You care about data correctness at a deep level. A wrong medication record isn't a bug; it's a patient safety issue.

• You thrive in a fast-paced environment but don't confuse speed with carelessness.

We want the application process at Wellis to be fast, transparent, and personal.