Senior Backend Developer

Senior Backend Developer

Location: Rotterdam
Hours: 32 – 40 hours per week
Work model: Hybrid (office & remote)

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About the role

At TodayTomorrow we investigate what makes technology truly healthy. We develop digital products that help people live healthier lives while ensuring the technology itself remains ethical, sustainable, and human‑centred. Together with a compact, engaged team of designers, strategists and developers we build reliable, user‑friendly solutions for the health and sport sector.

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Responsibilities

• Own the technical setup of our projects.
• Collaborate with other developers, designers and product owners in multidisciplinary (scrum) teams.
• Make technical choices, keep track of feasibility and scope, and deliver scalable backend solutions.
• Lead the creation of new technical foundations or architecture.
• Share knowledge, mentor colleagues, and contribute directly to backend development.
• Help integrate AI technology responsibly (e.g., rapid prototyping, personalization, smart feedback, data processing).
• Guard and improve code quality, security and maintainability.
• Communicate technical decisions clearly to clients, enabling them to understand and contribute.

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Requirements / Profile

• Approximately 5 years experience as a developer, comfortable with technical responsibility.
• Experience designing software architecture and building projects from the ground up.
• Familiarity with various hosting solutions and server setups.
• Strong knowledge of Node.js and databases.
• Awareness of frontend frameworks such as Next.js or Flutter.
• Interest in or experience with AI tools/techniques (machine learning, generative AI, smart interfaces).
• Preference for clear, well‑documented, transferable code and thoughtful system/process design.
• Ability to realistically assess project feasibility and avoid unnecessary technical complexity.
• Up‑to‑date with privacy and security regulations (including the AI‑Act); ISO 27001 knowledge is a plus.
• Affinity with healthcare and sport; experience in this sector is a plus.

Education level: HBO
Career level: Ervaren (experienced)

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About TodayTomorrow

At TodayTomorrow you get the chance to make a real difference in people’s lives. We focus on meaningful, long‑term projects rather than fleeting assignments. As a backend developer you will play a key role in shaping our growth and positioning within the health niche.

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What we offer (Benefits)

• Open & relaxed work atmosphere where you can be yourself, within a creative, integrity‑driven team with little ego and hierarchy.
• A pleasant office in the heart of Rotterdam, walking distance from Central Station; hybrid work with fixed office days on Monday and Thursday.
• Plenty of space for relaxation and socialising with colleagues.
• Autonomy over your own growth path and a competitive salary (€4 500 – 5 900 gross per month, depending on experience).
• MacBook Pro with accessories and a monitor for your home‑office setup.
• Phone allowance, home‑office allowance, and public‑transport or mileage reimbursement.
• Pension contribution.