Bluetooth-connected sport-tracking apps

Overview

Two iOS apps for a confidential client, one for running and one for walking. Both collect activity data from a hardware Bluetooth module and GPS, and sync it with the cloud. I worked on them as a senior iOS developer and managed the iOS side of the team.

Responsibilities

• Built and improved the apps: BLE communication with CoreBluetooth, the UI for device control, error handling, and data sync with the cloud.
• Set up error monitoring through a private web dashboard and Firebase Crashlytics crash reporting.
• Delivered the apps to the App Store and kept them updated.
• Managed the iOS team members and worked with Product, Design, backend, and QA.

Selected engineering work

• Architected and delivered both apps around custom gyroscope wearables connected through CoreBluetooth, with BLE reconnection logic.
• Built GPS pipelines with CoreLocation, offline-first data handling, and on-device analytics, and visualised the data for user activity analysis.
• Worked with the team behind the private SDK module framework on its integration.
• Defined the technical roadmap for the iOS apps.

Technologies