You are interested in the position as Senior TypeScript / React / React Native Developer (m/f/d) at Fastic GmbH?
On the job platform Instaffo, you can apply for this and other jobs with ease. Create your profile in under 3 minutes and start the application process with just a few clicks.
Please note that this position requires work authorization for Germany.
The language requirements for this position are: English - Fluent, German - Fluent.
The estimated salary range from XING does not necessarily correspond to the salary range of this job offer.

We are building a modern, high-impact digital health platform used by millions of users worldwide. Our product combines mobile excellence, scalable backend systems, and cutting-edge AI-driven features. As a Senior TypeScript / React / React Native Developer, you will play a central role in building and scaling our mobile and backend systems, actively shaping architecture and driving technical excellence.

Activities

• Architect, build, and maintain high-performance React Native applications for iOS and Android
• Develop and maintain scalable Node.js backend services and serverless functions in TypeScript
• Collaborate closely with Product and Design to translate requirements into robust technical solutions
• Take ownership of architectural decisions across frontend and backend
• Ensure high engineering standards through clean code, testing, documentation, and structured peer reviews
• Optimize performance, reliability, and scalability of both mobile apps and backend services
• Improve CI/CD pipelines and deployment workflows
• Drive technical improvements proactively. Refactoring, performance tuning, system redesign where necessary
• Contribute to AI-powered product features where applicable

Requirements

• 5+ years of professional experience with TypeScript and React
• Strong hands-on experience with React Native in production environments
• Experience building Node.js backend systems using TypeScript
• Solid understanding of scalable architectures (REST APIs, serverless, cloud functions, event-driven systems)
• Experience working in cloud environments (GCP, AWS, or similar)
• Strong understanding of performance optimization and debugging complex systems
• Experience with automated testing (unit + integration)
• Familiar with modern AI coding tools such as Codex, Claude, Cursor, or similar AI-assisted development tools
• Strong ownership mindset and ability to work independently in a high-performance team

Team

We are a small team of 20 employees, with our office based in Dresden. You will work closely with our CTO and be able to collaborate with another developer. In addition, you will also work very closely with other stakeholders, including colleagues from Product and Marketing.

Application Process

First interview focused on technical skills and company fit

Assessment of competencies through a test assignment

Hiring decision

Offer stage

Contract signing

Start date / joining the company

About the Company

Lose Weight and Feel Great ⚕️- with Fastic!