Senior Software Engineer - Mobile & Backend

About the role

Zayyh is an Australia-based health technology startup building a mobile app and a connected wearable band, launching on iOS and Android at the same time. Its engineering team works on-site in Islamabad, and the company is small enough that every engineer shapes the product, the architecture and how it is built. The role is not limited to one layer: you will take a problem from an open question to a researched design, then to working software on a real phone, and you will be trusted to choose the approach.

Key responsibilities

• Design systems end-to-end: how data moves from a wearable to the phone to the cloud, and how it stays correct, private and in sync when connections drop.
• Build features across the stack: React Native screens, native modules in Swift and Kotlin, database schemas and migrations, and backend functions and APIs.
• Turn Figma designs into production UI, handling loading, empty, error, offline, long text, large text sizes and reduced motion.
• Research before building: read platform docs and vendor SDKs, compare options, run small experiments and write a short design note with a recommendation.
• Solve hard problems such as wrong, slow or missing data and bugs that only appear on a real device.
• Review teammates' code, raise the bar on quality and testing, shape the architecture as the product grows and mentor other engineers.

Required profile

• 6+ years of professional software engineering, including at least 3 years on mobile apps that shipped to the App Store or Google Play.
• Strong TypeScript and production React Native experience; deep native mobile experience also counts.
• Production code in Swift or Kotlin beyond UI screens, such as native modules, background work or Bluetooth APIs.
• Backend and database design: relational schemas, migrations, APIs, with attention to security, access control and data integrity (Postgres preferred).
• System design you can defend, and research and critical thinking.
• Clear written and spoken English.
• Nice to have: Bluetooth LE, background execution, HealthKit/Health Connect, offline-first apps, Supabase, LLM API features, animation and gesture work in React Native, and experience at an early-stage startup.

What we offer

• A competitive salary in PKR, discussed at the interview.
• A MacBook, plus test iPhone and Android devices and the wearable.
• Real ownership of architecture decisions in a product launching on two platforms.
• On-site at the office in Bahria Town Phase 7, Islamabad, Monday to Friday, 10 am to 6 pm, in a full-time role.

To apply, send your CV and answers to four questions (a published app, the hardest technical problem you solved, a system you designed, and your current and expected monthly salary and notice period) in a single PDF. The role is on-site in Islamabad and open to Islamabad-based candidates only.