Mobile Developer

Wellis Health; Rotterdam; Hybrid; EUR 56,000 - 89,000; Full time

Benefits offered by this job

Pension plan

Learning budget

Monthly personal budget (Alleo)

Hybrid working: Rotterdam office (2d/w

Remote work days: 20 per year

Home office allowance

Job summary

Wellis Health in Rotterdam is seeking a Mobile Developer to shape the next generation of the Wellis app across iOS and Android. You will translate designs into seamless native experiences, integrate health features, and lay the foundation for a scalable, content-rich wellness platform.

Join a fast-growing healthtech team reporting to the CTO, collaborating with UX, backend, and data teams. You will own features end-to-end, focus on performance, localization, and security, and help drive mobile

Qualifications

• 3-5 years hands-on experience in native mobile development.
• Experience shipping complex, content-rich apps beyond e-commerce.
• Experience integrating mobile apps with cloud backends and APIs (GCP preferred).
• Familiar with design tools (Figma) and translating UX/UI to native apps.
• Ability to leverage AI in development.

Responsibilities

• Own the Wellis app end-to-end from MVP to scalable product.
• Translate designs from Figma into native iOS and Android experiences.
• Build features around health, wellness, and coaching—beyond simple checkout.
• Integrate HealthKit, Google Fit, wearables for data-driven journeys.
• Collaborate with backend engineers to connect the app to a GCP-based API-first platform.
• Implement localization and multi-market capabilities for global scaling.
• Ensure performance, reliability, and security of health data.
• Act as sparring partner for product, UX, and mobile strategy.

Skills

iOS Swift

Android Kotlin

Healthtech experience

English fluency

Job description

Introduction

The digital customer journey at Wellis is growing rapidly and becoming more complex. To take it to the next level, we're looking for a Mobile Developer (iOS & Android). You will own everything that touches our mobile experience - from the very first app open to long‑term retention. With your knowledge of native iOS and Android development, mobile UX, and connected health features, you'll make the Wellis app smarter, more personal, and truly engaging. It's time for an experienced mobile specialist to raise our app experience to benchmark level in the healthcare and wellness world.

About Wellis

Wellis is a fast‑growing healthtech scale‑up that is reinventing one of the most traditional sectors: healthcare. What started just three years ago has already grown into a company with tens of thousands of customers, and we are only at the beginning. By combining medical expertise with technology and data, we make healthcare smarter, more efficient, and more personal.

Our mission is to improve everyday lives by making care accessible, personal, and seamless. Through our platform, people can take control of their health journey with trusted medical support, smart digital tools, and tailored programs. We move fast, challenge conventions, and build solutions that truly make an impact, because we believe better healthcare should be within everyone's reach.

About The Role

As a Mobile Developer, you'll take the lead in shaping the next generation of the Wellis app. You'll translate designs into seamless native experiences across iOS and Android, integrate smart health features, and build the foundation for a scalable, content‑rich wellness platform. Your job is to ensure the Wellis app feels intuitive, personal, and genuinely supportive throughout the user's health journey — far beyond a simple e-commerce transaction.

Key Responsibilities

• Take end-to-end ownership of the Wellis app - from first MVP to a mature, scalable product.
• Translate UX/UI designs from Figma into high-quality, native iOS and Android experiences.
• Design, build, and maintain complex app features around health, wellness, and coaching - far beyond a simple e‑commerce checkout.
• Integrate with Apple HealthKit, Google Fit, wearables, and other device capabilities to create smart, data‑driven user journeys.
• Collaborate closely with backend engineers to connect the app to our GCP‑based, API‑first platform.
• Implement localization and multi‑market capabilities so the app can scale across countries and languages.
• Ensure app performance, reliability, and security, especially around sensitive health data.
• Act as a sparring partner for product, UX, and C‑level on mobile strategy, roadmap, and technical choices.

About The Team

You'll report directly to the CTO, who brings deep experience in building scalable digital platforms and high-impact mobile products. You'll work closely with our UX/UI partners, backend engineers, data team, and medical & customer care teams — with plenty of room to take initiative yourself. As we're building our mobile capabilities from the ground up, the product & tech domain is growing fast, and you'll have the opportunity to play a key role in shaping our mobile app vision and future mobile team.

A Week in the Life @ Wellis

• Monday: Review the current iOS and Android app backlog, clarify requirements with Product, and translate new UX/UI designs from Figma into technical tasks.
• Tuesday: Implement new iOS and Android features in Swift and Kotlin, pair with backend engineers to refine APIs, and push an internal test build for feedback.
• Wednesday: Integrate Apple HealthKit, Google Fit, or other device data, improve performance and stability, and fix bugs discovered in recent releases.
• Thursday: Sync with designers and stakeholders on upcoming wellness and coaching flows, refine the app architecture, and improve code quality through refactoring and reviews.
• Friday: Prepare and ship a new TestFlight or App Store build, monitor key app KPIs and crash reports, and share progress, learnings, and next‑steps with the wider product & tech team.

Who You Are

• At least 3‑5years of hands‑on experience in native mobile app development, with proven expertise in both iOS (Swift) and Android (React Native).
• Deep experience building and shipping complex, content‑rich, highly interactive apps (beyond basic e‑commerce/check‑out flows).
• Experienced in integrating mobile apps with cloud backends and APIs (preferably GCP, but AWS/Azure experience is welcome).
• Comfortable working with design tools and workflows (e.g. Figma) and translating UX/UI concepts into smooth native mobile experiences.
• You are an early AI adapter and know how to leverage AI in your work.
• Combine strong engineering craft with a product mindset: you think in terms of user journeys, personalization, and long‑term scalability.
• Strong collaborator and communicator across multiple disciplines (product, design, data, medical/clinical, customer care).
• Fluent in English; experience in healthtech, wellness, or other data‑sensitive domains is a plus.
• We are looking for a builder mindset (Someone who has made his own App)

What We Offer

• Salary range €5.000 - € 8.000 gross per month (depending on experience)
• Pension plan
• Learning budget
• Monthly personal budget (Alleo)
• Hybrid working: partly from our new office in central Rotterdam (2 days)
• 20 days of remote working per year
• Working from home allowance (2 days a week)
• A culture of short lines, speed, and continuous improvement — where pragmatism and impact matter.
• The opportunity to help build a fast‑growing healthtech scale‑up from the inside.