Mid/Senior iOS Developer

NOWATCH is a beautiful piece of wearable jewellery capable of measuring a range of different vital signs and analyses. Being a screen-less device, the product comes with an app to monitor data and foster habit change. Whilst most other wearable focus on optimisation and performance for fitness, NOWATCH focuses on helping people restore balance in daily life.

We are looking for a Mid/Senior iOS Developer to join our team and play a crucial role in building and enhancing our iOS app, ensuring it delivers a seamless and intuitive user experience. If you’re passionate about creating innovative health-focused applications, working with sensor-based data, and pushing the limits of what iOS can do, we’d love to hear from you!

As our new Mid/Senior iOS Developer, you’ll play a vital role in shaping the future of our iOS app. In this role, you will:

• Build high-quality, scalable, and efficient iOS applications using Swift and SwiftUI.

• Work closely with our Bluetooth-enabled wearable to ensure accurate and efficient data transmission and synchronization.

• Ensure smooth real-time data processing, low latency, and power efficiency.

• Work with designers, backend engineers, and firmware developers to create a seamless product experience.

• Design and implement clean, modular, and maintainable code with best practices in mind.

• Write unit and UI tests, debug issues, and optimise app performance.

• Keep up with Apple’s latest technologies, APIs, and best practices to continuously improve the NOWATCH iOS experience.

We’re looking for someone who resonates with our values and brings:

• Expert in Swift & SwiftUI. Proficiency in UIKit.

• Deep understanding of Swift concurrency (async/await, Task, actor, Sendable), including structured concurrency and best practices for managing asynchronous workflows efficiently.

• Expert in performance optimisation, including profiling with Instruments to analyse CPU, memory, and energy usage.

• Deep understanding of SwiftUI performance, view diffing, and reducing unnecessary recomputations to ensure smooth and efficient rendering.

• Strong proficiency in Combine framework including publisher design, scheduler injection, share/replay semantics, and debugging race conditions in reactive pipelines.

• Strong expertise in Core Data, including data modelling, migrations, relationships, delete rules, multi-context concurrency, batching, migrations, and performance tuning.

• Strong understanding of Bluetooth (BLE) communication and handling sensor-based data.

• Experience working with Core Bluetooth, HealthKit, or similar frameworks is a plus.

• Solid knowledge of MVVM or Clean Architecture.

• Experience with real-time data processing and integrating with backend APIs.

• Ability to write efficient, maintainable, and testable code.

• Passionate about health-tech, wearable devices, and improving well-being through technology.

• Comfortable with high-complexity, multi-layer architectures.

• Bonus: Experience with ML models on-device, background processing, or low-power optimization.

Above all, we value a mindset that aligns with our mission.

• Entrepreneurial spirit with a “founder’s mindset” – authentic, proactive, resourceful, and ownership-oriented.

• Comfort with ambiguity and an ability to pivot strategies as needed.

• Passion for health technology and excitement to contribute to a mission-driven startup.

When you join our team, you’re not just taking a job—you’re embarking on a journey with like-minded individuals who care deeply about:

• Collaboration: We thrive together in our Amsterdam office.

• Growth: Opportunities to learn, evolve, and challenge yourself.

• Impact: Contributing to something bigger than ourselves.

At NOWATCH, we believe in supporting our team with:

• A MacBook and a NOWATCH (Model X).

• A competitive salary.

• A great office in the heart of the Jordaan, Amsterdam.

• Hybrid working environment

• 27 holiday days

• Team events: We celebrate the new seasons four times a year and host multiple events throughout the year.

Are you ready to help us inspire a more mindful world? Send us your CV and a short note about why this role excites you.

Application Deadline: February 15th, 2026

Let’s build something extraordinary together.