iOS Developer (Native, BLE / Connected Devices)

iOS Developer (Native, BLE / Connected Devices)

Location:	Technopark, Trivandrum
Experience:	8+ Years

About the Role

We are looking for a Native iOS Developer to build and maintain mobile applications for a connected-device platform. The app connects to smart hardware over Bluetooth Low Energy (BLE) and works closely with cloud services that handle access and permissions. You will own feature development, maintenance, and production support, working closely with Cloud, Firmware, DevOps, and QA teams to deliver releases on time.

Key Responsibilities

• Native iOS development using Swift and the current iOS SDK
• Implement new features based on product requirements
• Maintain existing applications, including bug fixes and performance optimization
• Integrate with backend APIs (REST / GraphQL) and cloud services (AWS-hosted)
• Must have: Implement device communication over BLE (CoreBluetooth) — BLE queue management, scanning and scan filtering, ciphering, GATT services/characteristics, and hardware communication protocols for smart devices
• Implement UI/UX following design specifications and Apple Human Interface Guidelines
• Manage app store submission, builds, and release management
• Write unit and UI tests to minimize defects and reproduce intermittent issues
• Diagnose and resolve hard-to-reproduce production issues using analytics and crash data
• Conduct code reviews and maintain technical documentation
• Collaborate closely with the Cloud/Web team on API integration

Required Skills & Experience

Core iOS & Language

• Expert-level native iOS development (Swift, current iOS SDK)
• Strong command of both SwiftUI and UIKit, and sound judgment on when to use each
• Concurrency: async/await, Combine and GCD; thread-safety and race-condition handling; tracing and preventing memory leaks

Architecture & Design

• MVVM and Clean Architecture in depth, including the domain / Use Case layer
• Dependency Injection; designing reusable UI and functional components across the app

APIs, Networking & Security

• RESTful and GraphQL integration (Alamofire); awareness of SOAP and its trade-offs
• API caching, request optimization (reducing redundant calls), and timeout configuration
• Token-based auth: JWT (payload/claims), refresh tokens and expiry handling, SSO, Cognito or similar
• Certificate / SSL pinning and certificate renewal; secure credential storage (Keychain)

Data & Persistence

• Persistence mechanisms (Keychain, UserDefaults, Core Data / local DB) and secure storage of sensitive data
• Handling data migration and integrity issues across app updates

BLE / Connected-Device Communication (core to the role)

• Hands-on CoreBluetooth: full BLE flow (scanning → connection → service discovery → communication → disconnection)
• BLE queue / operation management, scan filtering, GATT/ATT, services and characteristics
• MTU / packet-size handling, response parsing, acknowledgements and reliable byte-level transfer, exponential retry and reconnection
• Ciphering and encrypted device communication; OTA firmware-update considerations

Notifications, Analytics & Observability

• Push notifications (APNS): payload structure, parsing, and payload-driven navigation
• Analytics and crash reporting (Firebase / Crashlytics); using analytics and logs to debug elusive production issues

Quality, Tooling & Delivery

• CI/CD pipelines for mobile (e.g., Fastlane); app-store submission (TestFlight, Apple App Store)
• Build / dependency tooling: Xcode, CocoaPods, Swift Package Manager
• Testing: XCTest, XCUITest; a clear view of meaningful coverage and which layers to test
• Localization implementation and management (incl. tooling such as Phrase); awareness of iOS/Android localization differences

Preferred / Nice to Have

• Experience with IoT / connected-device companion apps (strongly preferred)
• Experience with OTA firmware update flows
• Location features: Geofencing (background and terminated-state behaviour), MapKit
• Siri Shortcuts, AWS service integration, in-app chat SDKs
• Designing a shared codebase across iOS and macOS
• Practical use of AI-assisted development tools in day-to-day workflow
• Good to have: B1 visa

Technical Screening Focus Areas

• Project walkthroughs — architecture decisions, individual contributions, and real production challenges and how they were resolved
• BLE end-to-end — flow, GATT and characteristics, MTU / packet size, reliable transfer and acknowledgements, retry and reconnection, max simultaneous device connections
• Concurrency — async/await vs Combine, thread-safety, race conditions, memory-leak tracing
• Architecture — MVVM / Clean, Use Cases, Dependency Injection, reusability
• Networking & security — REST/GraphQL (and SOAP), caching and optimization, JWT and refresh tokens, SSO, SSL pinning and certificate renewal
• Persistence — Keychain vs UserDefaults, secure storage, data migration across app updates
• Supporting areas — APNS payload handling, analytics-led production debugging, localization, and unit-testing strategy

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