Senior Full-Stack Developer (f/m/x)

Data4Life; Berlin; On-site; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Flexible working models — work from  

30 days vacation

Private supplementary health insurance

Public transport ticket

Job summary

Data4Life seeks a Senior Full-Stack Engineer to help build a medical image annotation app in collaboration with Mount Sinai Health System (New York). You will design, implement, and ship robust frontend and backend features that scale for clinical researchers handling real patient data.

You will own end-to-end quality, participate in architecture discussions, and collaborate with a diverse, international team across multiple locations. Security and data protection are central to the role.

Qualifications

• 3+ years of professional experience as a software engineer or full-stack developer.
• Frontend: HTML, CSS, JavaScript/TypeScript, React.
• Backend: Go, Kubernetes, Docker.
• Relational databases experience; PostgreSQL used.
• Professional written and spoken English; German a plus.

Responsibilities

• Design, build, and ship high-quality frontend and backend features — accessible, performant, maintainable, and well-tested code.
• Contribute to software design and architecture decisions, and participate in code reviews across the full stack.
• Collaborate with designers, QA, and product management to deliver well-crafted, user-centered software.
• Engage directly with customers and users — joining feedback sessions and user research to understand problems.
• Design with security at the core — authorization concepts and data protection architecture.

Skills

HTML

CSS

JavaScript/TypeScript

React

Go (Golang)

Kubernetes

Docker

PostgreSQL

English proficiency

German language skills

Education

Bachelor's degree in Computer Science / Software Engineering

Tools

Git

Job description

At Data4Life, we develop secure, standards-compliant digital health solutions that empower researchers and public health institutions to advance evidence-based medicine. As a nonprofit supported by the Hasso Plattner Foundation, we build scalable research infrastructures - supporting international standards such as FHIR and OMOP, and collaborate with some of the world's leading clinical institutions.
As a Senior Full-Stack Engineer, you will work on a medical image annotation application built in collaboration with Mount Sinai Health System in New York, one of the largest and most respected academic medical centers in the United States. Your code will support clinical researchers working with real patient data at scale.

Your future role

• Design, build, and ship high-quality frontend and backend features — writing accessible, performant, maintainable, and well-tested code.

• Contribute to software design and architecture decisions, and take part in code reviews across the full stack.

• Work closely with designers, QA, and product management as part of an integrated team to deliver well-crafted, user-centered software.
• Engage directly with customers and users — joining feedback sessions and user research to build a deep, end-to-end understanding of the product and the problems it solves.

• Design with security at the core — shaping authorization concepts and data protection architecture from the ground up, including the documentation that supports review and sign-off by our clinical partners.

What you need to succeed

• A university degree in Computer Science, Software Engineering, or a related discipline.

• 3+ years of professional experience as a software engineer or full-stack developer, or equivalent experience.

• Strong frontend skills: deep fluency in HTML, CSS, and JavaScript/TypeScript, with hands‑on experience in React or equivalent.
• Solid backend experience: proficiency in Go (Golang), Kubernetes, and Docker, or equivalent.
• Experience with relational databases; we use PostgreSQL.

• Professional written and spoken English, German language skills a plus.

Why you will love working with us

• High level of personal responsibility and creative freedom
• Work on socially impactful projects in the healthcare sector
• Collaboration with leading partners from research, technology, and healthcare
• A diverse, interdisciplinary, and international team working across three locations (Potsdam, Berlin, and Singapore)
• Flexible working models with the option to work from home
• Permanent employment contract with 30 days of vacation
• Attractive employee benefits, e.g. private supplementary health insurance, public transport ticket

Good to know

We particularly welcome applications from members of the LGBTQI+ community, individuals with a migration background, people of color, and people with disabilities or chronic illnesses.
If you require any accommodations or specific assistance during the application or interview process due to a disability, please let us know. We will do our best to support you.
Please include the relevant documents with your application (CV/résumé, certificates if applicable, earliest possible start date, and your current notice period).