Lumysi is a growing startup serving an international market.
We are building a health wearable inspired by jewelry.
The device continuously and discreetly tracks more than 30 health metrics, including heart rate, HRV, sleep, temperature, recovery, and women's health.
The app transforms this data into useful insights and will be supported by AI.
The first units will be delivered to customers in October .
The Role
We are looking for a Senior Mobile Developer to take primary ownership of the development of the Lumysi application.
Because the device does not have a screen, the app represents the entire user experience, making this a highly influential role within the startup.
The selected candidate will be responsible for the development and security of the application, as well as coordination with the hardware team, which is building the device chipset and firmware.
Some health measurements will need to be calibrated and calculated through software.
The company has strong growth prospects, and we therefore offer a clear career path with genuine opportunities for internal progression.
This role requires an established mobile app development profile.
It is not intended for purely managerial candidates who are no longer involved in hands‐on technical work, early‐career professionals who require continuous supervision, or developers whose expertise is primarily focused on backend development.
We value professional maturity in mobile app development, independent judgment, and the motivation to grow alongside the project.
What You Will Do
Design, develop, and maintain Lumysi's companion app for Android and iOS.
Integrate communication with the bracelet through Bluetooth Low Energy (BLE), including pairing, passive background synchronization of biometric data, reconnection management, and battery consumption optimization for both the mobile phone and the device.
Build the experience that gives meaning to a screenless wearable.
The app is the product's only interface, so fluidity, clarity, and attention to detail genuinely matter.
Present AI-generated insights in a clear and actionable way.
Ensure the privacy and security of customers' health data with the level of responsibility required by the industry.
Maintain the performance, stability, and reliability of the 24/7 synchronization cycle.
As the company grows, support the recruitment, training, and leadership of the mobile development team.
What We Are Looking For
Four to seven years of hands‐on experience building mobile applications that have been released into production and used by real users, not only personal or academic projects.
A strong computer science foundation, including data structures, algorithms, concurrency, and the ability to evaluate and select the right technical solution.
You understand why your code works, not simply that it works.
Strong expertise in React Native and platform‐specific best practices.
Strong product and UX awareness.
You understand that you are building the only visible interface of the product.
Autonomy and sound judgment.
You know how to prioritize, unblock yourself, and identify when an idea or technical approach is not appropriate.
A startup mindset.
You are motivated by ownership, autonomy, fast‐paced environments, and seeing the direct results of what you build.
The ambition to grow into a technical leadership role.
Strong English skills are essential.
Especially Valued
Experience publishing applications on the App Store and Google Play and maintaining them in production.
Experience with React Native.
A strong commitment to customer data security.
An interest in health, wellness, or the quantified‐self space.
What We Offer
A role with genuine long‐term progression and the opportunity to lead the entire mobile development team as the company grows.
Direct impact.
Because the app is the product's primary interface and we are a startup, your decisions will shape the user experience from day one.
You will lead its development.
A growing startup with a funded product and an international market.
Competitive compensation plus equity or company ownership participation.
#J- *-Ljbffr
Sign in
To continue your applicationor continue with email
By continuing you agree to our Terms & Privacy Policy.
