Senior Software Engineer, Python

About the Role

We're on the lookout for an ambitious Senior Software Engineer with focus on Python to join our Engineering team at our office in Berlin. Join us in building the largest AI enabled fintech for healthcare!

About Nelly

We are building the AI-Driven Financial Operating System for European healthcare, solving the biggest challenges for patients and practices. Our all-in-one platform transforms chaotic administrative processes into intelligent, automated workflows, from patient care to billing to next-generation payments. With our Series B funding of over €50 million from world-class investors, we are turning our vision into reality.

Joining Us, You Will

• Build and maintain our Python backend using FastAPI, Pydantic, SQLModel/SQLAlchemy, and PostgreSQL (including pgvector), designing the APIs and data models that power the platform
• Contribute across the stack when needed, working with our TypeScript, React, Next.js, and Node.js applications
• Build AI-powered workflows using modern language models, orchestration frameworks, and evaluation tooling
• Take ownership from development to production by building, deploying, and operating services on AWS with infrastructure managed through Terraform
• Collaborate closely with product, design, and data to ship impactful, user-centric features
• Make a significant contribution to defining, maintaining and improving our architecture and best practices
• Join a driven, highly skilled engineering team

What You'll Bring

• 5+ years of experience in software engineering
• Strong proficiency in Python, ideally with a modern web framework like FastAPI (or Django/Flask)
• Experience with data and API modeling (e.g., Pydantic, SQL/ORMs) and relational databases like PostgreSQL
• Experience with cloud platforms like AWS and infrastructure as code (Terraform a plus)
• Bonus: hands-on experience building with LLMs / AI agents in production
• Knowledge of software engineering best practices for the full development life cycle
• A pragmatic mindset and strong sense of ownership
• Team player attitude with excellent communication skills

What We Offer

• Deutschlandticket or Swapfiets membership
• Urban Sports Club membership
• Flexible working hours and a hybrid setup
• Up to 4 weeks of workation
• A dog-friendly office with great vibes
• Snacks and a fridge full of cold drinks

We welcome applications from people of all genders and backgrounds, regardless of origin or age.