Senior Full Stack Engineer (all) - TypeScript

Let me introduce...

ith 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 proactive, impact-driven, and ready to shape the future of healthcare, join us.

We’re looking for a Senior Full-Stack Engineer (all) to help us build modern, high-performing web applications. You’ll play a key role in shaping our architecture, mentoring team members, and contributing to the scalability of our product.

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

• Application Development: Design and implement robust, scalable full-stack web applications.
• Code Quality: Write clean, maintainable, and testable code following best practices.
• Architecture: Collaborate on architecture decisions and long-term technical planning.
• Performance: Optimize application performance and improve system reliability.
• Mentorship: Mentor junior developers and support their growth.
• Review & Feedback: Conduct code reviews and share constructive feedback.
• Documentation: Contribute to technical documentation and knowledge sharing.

You’ll thrive in this role if you bring

Must Haves

• Experience: 8+ years of professional software development experience.
• Core Expertise: Strong expertise in TypeScript / JavaScript and Node.js .
• Frontend: Proven experience with React and modern front-end development.
• Fundamentals: Solid understanding of full-stack development principles.
• Database Layer: Hands-on experience with ORM tools, especially Prisma .
• Backend: Experience in backend development with Node.js .
• APIs: Familiarity with RESTful API design and implementation.
• DevOps Foundation: Understanding of CI/CD pipelines.
• Version Control: Proficiency with Git version control.
• Data Modeling: Experience with database design and data modeling.

Nice to Have

• Frameworks: Experience with Remix.run or other server-side rendering (SSR) frameworks.
• UI Libraries: Familiarity with Chakra UI .
• Testing: Experience with testing frameworks (e.g., Playwright, Vitest ).

Why you’ll love working with us

• An engineering-driven culture with modern tools and clean code practices.
• A product-focused environment where quality and performance matter.
• A collaborative team that values learning, pragmatism, and ownership.
• Attractive compensation aligned with your skills.
• Flexible work arrangements.
• 30 days of vacation per year.
• The chance to work on products that directly shape the future of healthcare.

Ready to apply?

If you enjoy building meaningful applications, driving technical excellence, and contributing to the transformation of healthcare, we’d love to hear from you!

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

About us

At Sonia, we’re building more than just a product — we’re building a team that helps doctors succeed with the power of AI. To grow and shape the future of healthcare, we’re looking for people who want to create, challenge, and collaborate — and have fun while doing it.

We believe teams thrive when different perspectives come together and work toward a shared goal. We welcome and respect everyone for who they are, regardless of origin, gender, age, religion, disability, or sexual identity. We’re excited to meet people from all backgrounds who want to bring their unique perspective to our mission.

Are you in?