We’re looking for a Senior Freelance Engineer (Mobile + Backend) to partner directly with the founder in building a scalable, data-driven system in the Digital Health / Femtech space.
This is a long-term, strategic collaboration with real influence on architecture, product direction, and system design with the potential for equity participation.
Tasks
* Analyze and evolve existing systems into a clean, scalable architecture
* Own system design across mobile and backend, including data models and core logic
* Ensure robust integration between mobile and backend systems
* Lay the technical foundation for future features, algorithms, and product growth, and the evolution of business logic
* Communicate decisions clearly and transfer knowledge to founder to enable long-term system ownership
Requirements
* Seniority: 5–8+ years of experience in real product environments with strong engineering standards (testing, code quality, production readiness)
* Strong experience with React Native, TypeScript, and mobile architecture
* Advanced backend expertise ( AWS )
* Proven experience designing scalable architectures and refactoring complex systems, including modeling complex, state-driven systems and data logic
* Experience with data modeling, system design, and data-driven or algorithmic products
* Solid understanding of GDPR and handling sensitive data
* Interest in (female) health and hormonal systems
* Experience in digital health startups
Benefits
* Flexible, remote-first work
* Personal coaching support
* Meaningful work: direct impact on women’s health through product and system design
* Fair, structured compensation and a long-term perspective for strong collaboration
How You’ll Work: Freelance setup (individual or max. 2 people) 10–20 hours/week, working directly with the founder with a collaborative style that includes independent ownership, pair programming, code reviews, and architecture discussions.
Please send:
* Relevant projects (especially refactoring and system design/building)
* A brief description of your approach to working with complex codebases
* GitHub, code samples, or other insights into how you work