At Stonewell, we work with ambitious entrepreneurs around the globe, delivering pragmatic, high-value AI solutions, automation, and smart software products. Our clients move fast and expect excellence, and so do we. We’re looking for a quality-driven, hard-working, and experienced Web- and Mobile App Developer who thrives in high-growth environments and takes full ownership of delivering successful projects for our clients.
Map out project plans and solution architectures, working closely with the Team Lead to translate client needs into scalable, maintainable software solutions.
Design, build, and maintain (AI-feature-enhanced) web applications (portals, etc.) and mobile applications (iOS, etc.).
Integrate and set up the full tech stack/scope, including (vector) databases, AI components (RAG applications, AI/LLM-driven functionality).
Ideally, connect the front end to back-end automation components. This may be within your own expertise or achieved by collaborating with other team members.
Take ownership of app development end-to-end, from concept and implementation to testing, deployment, and iteration.
Document architectures, workflows, and integrations to support long-term maintainability and knowledge sharing.
3-5+ years of experience as a (web-)app developer.
Proven track record in developing AI-enhanced platforms (AI functionality embedded into systems and applications).
Comfortable working with APIs, third-party services, database technologies (including vector databases), and AI components (primarily LLMs; often without extensive fine-tuning or traditional ML).
Able to work during Dutch office hours (08:00–18:00 Amsterdam time).
Fluent in English; Dutch is a plus.
Communicates professionally and clearly with clients, is responsive and reliable, and consistently prioritizes project success.
Proactive, takes ownership, has strong problem-solving skills, and gets things done.
Thrives in a fast-paced, high-growth startup environment, with flexibility and a strong sense of responsibility.
Join a driven team of ~10 developers, working on impactful projects for ambitious clients in the Netherlands and across the globe.
Gain exposure to growth opportunities, including the potential to step into team lead or CTO roles within our upcoming ventures and labels launching in 2026.
Work in a high-performance environment where quality, ownership, and speed are the standard, and where success is shared between you, the team, and our clients.
Work for clients where your solutions actually make an impact. You’re involved in their success from beginning to end, truly providing value, and building deep relationships with top entrepreneurs in the country.
Enjoy a high level of autonomy and flexibility, including the freedom to work from wherever you perform best.
Join a team where the founders actually care about you and your ambitions. We focus on building the life you want, while creating win-win-win outcomes for you, our clients, and the business.
