Technical Co-Founder / CTO

About the role

Kysana is a Swiss digital health startup building software that supports professionally guided ketogenic and metabolic care across mental health, neurology and metabolic conditions. Its platform connects healthcare professionals and patients through a mobile app and a professional dashboard, with personalised nutrition planning, AI-assisted food analysis and health tracking. The company has a functioning platform, an existing technical foundation and early clinical collaboration work, and is looking for a Technical Co-Founder / CTO to take ownership of the technology and help shape its next stage. The role is initially part-time, remote-friendly, equity-based with no initial salary.

Key responsibilities

• Own the architecture and codebase: assess the existing platform, prioritise technical improvements and make pragmatic build-versus-buy decisions.
• Develop across web and mobile: evolve the professional dashboard, backend, APIs and the Flutter app for iOS and Android.
• Build product features such as personalised nutrition planning, meal planning, food analysis and patient-professional workflows.
• Integrate AI responsibly, with attention to accuracy, privacy and human oversight.
• Strengthen engineering foundations: testing, deployment, monitoring, documentation, security and reliability.
• Shape the technology roadmap with the founding team, translating clinical and user needs into focused priorities.

Required profile

• Senior, hands-on engineer who takes responsibility beyond individual tasks.
• Experience taking over an existing codebase and improving it without unnecessary rewrites.
• Sound judgement on architecture, security, delivery speed and technical debt.
• Entrepreneurial mindset: independent, clear communicator, turns uncertainty into practical next steps.
• Experience with AI-enabled products, healthcare software or sensitive personal data is particularly valuable; an interest in nutrition, metabolic health or mental healthcare helps.

Required skills

• Full-stack experience with TypeScript, React/Next.js, backend development and APIs.
• Flutter for iOS and Android.
• PostgreSQL and database design.

What we offer

• 5% equity in Kysana AG, subject to an agreed vesting arrangement.
• Substantial technical autonomy and direct involvement in product and company-building decisions.
• An existing product and technical foundation to develop further.
• Close collaboration with the founding team and healthcare professionals.
• Flexible, remote-friendly working arrangements, initially part-time.
• Possibility of transitioning into a paid role once funding is secured, subject to available resources and agreed terms.

To apply, send a short introduction, your LinkedIn profile and/or GitHub, and one or two examples of products you have built or technically led, explaining why you are interested in Kysana and the level of part-time commitment you can offer.