Lead Full Stack Engineer

Introduction

At Wellis, we believe healthcare should be more accessible, personal, and stigma-free. Too often, people hesitate to seek help for certain health concerns. Our mission is to lower those barriers and make it simple for people to connect with the right care — now, and for the long term.

We’re building more than just a website: our ambition is to launch a mobile app that integrates with existing health apps and devices, giving people continuous support and insights that fit seamlessly into their lives. This is your chance to help shape a product that will improve healthcare for thousands of people — and eventually millions.

Why Wellis

Wellis is a young, fast-moving healthtech scale-up with a clear mission: combine medical expertise, technology, and data to make healthcare smarter, more efficient, and more personal. We started only 2 years ago, but experienced amazing traction and success leading us to the point where we are now creating structures, expanding teams with top talent and setting up our product for growth.

We’re focused on lowering the barriers to care, especially for health concerns people don’t always feel comfortable seeking help for. Our treatment portfolio is expanding rapidly, and our ambition is to build long-term, digital-first solutions that support people across different stages of their health journey.

You’ll join an ambitious, international team where ownership is encouraged, collaboration is key, and impact is visible from day one. We’re opening our new office in Rotterdam this year, where the team will meet 1–2 days per week to brainstorm, build, and grow together.

About the Tech Team

This is a unique moment to join Wellis. Up until now, much of the product foundation has been built externally — but now we’re bringing everything in-house. As one of the very first hires, you’ll be taking the lead on frontend and working side-by-side with our CTO, Anthony Ioannou as he builds the team and architecture from the ground up.

Anthony has scaled engineering teams from 0 to 300 people and combines hands-on technical expertise with a passion for building healthcare products that make a real difference. Together with him, you’ll set the standards, shape the architecture, and lay the foundation for a scalable digital platform both web and app.

Over the coming months, we’ll be hiring more engineers and specialists — growing into a team of around 10. This is your chance to get in early, influence key decisions, and help define not just the codebase, but also the culture and ways of working that will carry Wellis forward.

About the Role

As our Lead Fullstack Engineer, you’ll be responsible for our platform. You’ll take ownership of our platform after its initial launch (developed by an agency) and shape it into a long-term, scalable product. From architecture and code reviews to building intuitive, mobile-first experiences, you’ll be at the center of how patients interact with Wellis.

This role is ideal if you’re ~5 years into your career, eager to step into a lead position, and excited about building technology that makes healthcare more human and connected.

Responsibilities

• Lead the frontend development of the Wellis platform.

• Build and improve user journeys across website and app with a mobile-first mindset.

• Take over the codebase from an agency and make it your own.

• Work closely with Product, Design, and Backend on a seamless multi-channel experience.

• Mentor intern engineers and help shape the growing tech team.

• Ensure scalability, performance, and security through technical best practices.

• Contribute ideas for the new Wellis app, including integration with external healthcare apps and devices.

Who You Are

• ~5+ years of frontend engineering experience in product-driven environments.

• Strong knowledge of React, API-first integrations (REST/GraphQL), and modern frontend practices.

• Strong experience in modern development pratcises . GitHub , Gitflow , Ci/CD

• Wide exposure to multiple modern proigramming languages ( PolyGlot )

• Strong cloud native and architecture experience ( GCP,Aws,Azure,Vercel etc )

• Exposure to AI assisted code development

• Familiarity with intergations with a variety of SaaS and IPaS plartforms

• A true team player: collaborative, adaptable, and empowering others.

• Excited to grow into a leadership role without needing a big hierarchy.

• Able to work in our office in Rotterdam 1-2 days a week.

What We Offer

• A key role in building the digital foundation of Wellis, with direct impact on people’s health journeys.

• The chance to work closely with an experienced CTO and ambitious founders.

• A young, international team where ideas move fast and ownership is real.

• Hybrid working: mostly remote, with 1–2 days per week in our new Rotterdam office.

• A culture of collaboration, experimentation, and meaningful impact.

Hiring Process

We keep it simple and transparent:

1. Intro Call – a quick chat with our Talent Acquisition to learn about you and share more about Wellis.

2. Interview with Anthony (CTO) – a deep dive into your technical skills, experience, and ambitions.

3. Case & Technical Discussion – a practical case to discuss your approach and technical thinking.

4. Final Conversation with the Founders – meet the people behind Wellis and explore the bigger vision.

👉 This is a rare opportunity to join at the very start of building our tech team. You’ll help define not only the product, but also the way millions of people will experience healthcare in the future.