Senior Software Engineer (Python Backend)

Let me introduce...

With Sonia, doctors are successful doctors. We create and deploy AI-enhanced solutions that make doctors’ lives easier, patients’ care better, and healthcare systems more efficient. If you’re an intrinsically motivated self-starter who values impactful work, join us in revolutionizing healthcare.

We’re looking for a Senior Python Software Engineer (all) to take ownership of critical backend components in our AI-driven products. You’ll design and implement scalable architectures, mentor others, and ensure our systems are robust, reliable, and future-proof. Partnering closely with engineering and ML teams, you’ll build APIs and services that enable real-time communication, data processing, and automation at scale—always with clean, maintainable, and high-performing code.

This role can be performed in a hybrid setup from our offices in Luxembourg or Berlin, or remotely from anywhere in Germany or Luxembourg.

This is what you’ll own

Design, development, and maintenance of scalable backend services using Python 3 (async, type hinting).

Architect and implement RESTful APIs and real-time communication via WebSockets.

Drive technical discussions and decisions, shaping backend architecture and coding standards.

Debug and troubleshoot production issues, ensuring resilience, performance, and security.

Advance our CI/CD pipeline and containerized deployments (Docker).

Collaborate with ML engineers to integrate APIs and backend systems with AI/ML services.

Mentor and support other developers, fostering best practices in engineering, testing, and documentation.

Continuously identify opportunities for technical and process improvements.

You’ll thrive in this role if you bring

• 5+ years of professional experience in software development with Python 3.
• Deep knowledge of asynchronous programming, type hinting, and software design principles.
• Solid experience with web frameworks (FastAPI, Django, or Flask).
• Proven track record of designing and scaling APIs and backend architectures.
• Hands-on experience with real-time communication (WebSockets, Socket.IO, FastAPI WebSockets).
• Experience with containerization (Docker) and CI/CD systems.
• Strong debugging and testing skills in production environments.
• Expertise with version control (Git, GitLab, Bitbucket).
• Strong communicator with experience mentoring peers and leading projects.

Nice-to-Haves

Experience working with LLMs (routing, parsing, error handling, guardrails).

Knowledge of message brokers (RabbitMQ, Kafka, Redis Pub/Sub).

Exposure to NoSQL databases (Redis).

Familiarity with Kubernetes or DevOps practices.

Contributions to open-source projects.

Why you’ll love working with us

Full ownership of impactful backend components in a fast-growing AI environment.

A collaborative team that values curiosity, learning, and pragmatic problem-solving.

Flexible working arrangements (remote or hybrid).

Competitive salary depending on experience.

The chance to work on products that directly shape the future of healthcare.

Ready to apply?

If you’re passionate about backend engineering and want to make an impact in healthcare with cutting-edge AI technologies, we’d love to hear from you!

I’m Margarita and will be guiding you through the application process.