Full Stack Engineer

About ONLYQ

ultra-slim, clinical-grade health wearable

Cymetree Projects LLP

We’re assembling a world-class team to launch our Gen-1 wristband and mobile app—designed to compete with WHOOP, Oura, Garmin, and Apple.

Role Overview

Senior Full-Stack Mobile Developer

core team, high-ownership role

You will work closely with our firmware, sensor, and AI teams to deliver a world-class health and wellness experience.

What You Will Build

✔ Native iOS and Android apps for ONLYQ (Swift + Kotlin)

✔ High-stability BLE pipeline for PPG/ECG/EDA/Temp/IMU streaming

✔ Real-time data ingestion, processing, caching & cloud sync

✔ Backend API layer (Node.js or Python)

✔ AI/ML model integration (sleep, HRV, stress, readiness)

✔ Beautiful dashboards and wellness visualizations

✔ Secure user authentication, subscription, and cloud services

✔ CI/CD pipelines & scalable architecture for future V2/V3 hardware

Key Responsibilities

Mobile Development

• Build 

  native iOS

   apps using Swift, SwiftUI, Combine
• Build 

  native Android

   apps using Kotlin, Jetpack Compose
• Implement CoreBluetooth & Android BLE stack
• Optimize MTU, GATT, reconnection logic, and background sync
• Ensure ultra-reliable sensor data capture (5–50 Hz)

Backend & API

• Build REST + WebSocket APIs (Node.js or Python)
• Implement data storage (PostgreSQL/MongoDB)
• Setup cloud infrastructure (AWS/GCP)
• Ensure secure data flow & low-latency analytics

Data & AI Integration

• Integrate physiological AI models (Python/TensorFlow Lite)
• Work with our biosensor engineering team
• Implement signal cleaning, annotation & time-series sync

Architecture & Quality

• Implement MVVM / clean architecture
• Automated testing, CI/CD pipelines
• Optimize for battery life, background execution & stability
• Deliver smooth, polished UI interactions with animation support

Required Skills

Mobile (Mandatory)

• Expert in 

  Swift / SwiftUI / Combine

• Expert in 

  Kotlin / Jetpack Compose

• Strong experience with 

  BLE GATT communication

• Experience with real-time sensor data processing
• Experience with background services & multi-threading

Backend

• Proficient in 

  Node.js

   or 

  Python (FastAPI)

• Database experience: PostgreSQL or MongoDB
• Experience with AWS/GCP/Firebase

Wearable / Health Data

• Understanding of HR, HRV, ECG, IMU, Temp, or other biosignals
• Experience working with wellness, fitness, or IoT devices

Bonus Skills

• Experience with TensorFlow Lite / CoreML
• Experience with time-series data & signal processing
• Experience building subscription-based apps
• Knowledge of Apple HealthKit / Google Fit

Who Should Apply

• You are a 

  top-tier developer

   with a strong engineering mindset
• You’ve worked on 

  smartwatch / IoT / fitness apps

• You want to build a 

  global premium product from Day 1

• You enjoy solving deep Bluetooth, data, and architecture problems
• You want ownership—not just a coding job

What We Offer

·                Work on one of India’s most ambitious consumer health-tech products

·                High autonomy, fast decision cycles, and a world-class vision

·                Competitive compensation + performance-based incentives

Engineering Lead / CTO

·                Direct access to founders and full creative freedom