Mobile Native Developer (Swift & Kotlin)

Proof of Skill; Mumbai; On-site; INR 1,200,000 - 2,800,000; Full time

Job summary

Proof of Skill is hiring a Mobile Native Developer to build and ship new features for iOS and Android. You will work with Swift, Kotlin, SwiftUI, Jetpack Compose and modern tooling to deliver high-quality apps.

You’ll optimize performance, security, and offline capabilities while collaborating with design, QA, and backend teams. Join a fast-moving team in Mumbai, take ownership of releases, and help shape the mobile architecture with code reviews and design discussions.

Qualifications

• 2–3+ years building native mobile apps with production apps shipped to users.
• Strong Swift and Kotlin skills across both platforms.
• Experience with SwiftUI and/or UIKit, and Jetpack Compose and/or Android Views.
• Solid grasp of concurrency (Swift Concurrency, Kotlin Coroutines/Flow).
• Understanding of mobile security basics: secure storage, tokens and keys.
• Experience with REST or gRPC APIs, offline-first data and local persistence.
• Git, code review and CI for mobile (Fastlane, Xcode Cloud, GitHub Actions).

Responsibilities

• Build and ship LMN8 features in Swift (iOS) and Kotlin (Android).
• Write clean, testable code with modern UI frameworks: SwiftUI and Jetpack Compose.
• Implement privacy-first patterns: on-device processing, secure storage, minimal permissions and encrypted sync.
• Integrate with our backend APIs and keep apps fast and reliable on poor networks.
• Write unit and UI tests, and work closely with QA on release quality.
• Profile and fix performance, memory and battery issues.
• Own releases through App Store and Google Play, including review guidelines and privacy labels.
• Take part in design and code reviews and help shape our mobile architecture.

Skills

Swift

Kotlin

SwiftUI/ UIKit

Jetpack Compose/ Android Views

Concurrency

Mobile security basics

REST/gRPC APIs

Offline-first data persistence

Git & CI for mobile

Tools

Fastlane

Xcode Cloud

GitHub Actions

Xcode

Android Studio

Job description

2. Mobile Native Developer (Swift & Kotlin) Full-time · 2–3+ years' experience · [Location]

What you'll do

• Build and ship LMN8 features in Swift (iOS) and Kotlin (Android).
• Write clean, testable code with modern UI frameworks: SwiftUI and Jetpack Compose.
• Implement privacy-first patterns: on-device processing, secure storage (Keychain, Android Keystore), minimal permissions and encrypted sync.
• Integrate with our backend APIs and keep apps fast and reliable on poor networks.
• Write unit and UI tests, and work closely with QA on release quality.
• Profile and fix performance, memory and battery issues.
• Own releases through App Store and Google Play, including review guidelines and privacy labels.
• Take part in design and code reviews and help shape our mobile architecture.

What you'll bring

• 2–3+ years building native mobile apps, with production apps shipped to users.
• Strong Swift and Kotlin skills; you're comfortable working on both platforms.
• Experience with SwiftUI and/or UIKit, and Jetpack Compose and/or Android Views.
• Solid grasp of concurrency (Swift Concurrency, Kotlin Coroutines/Flow).
• Understanding of mobile security basics: secure storage, certificate pinning, safe handling of tokens and keys.
• Experience with REST or gRPC APIs, offline-first data and local persistence (Core Data/SwiftData, Room).
• Git, code review and CI for mobile (Fastlane, Xcode Cloud, GitHub Actions or similar).

Nice to have

• Experience with end-to-end encryption or cryptography libraries (CryptoKit, Tink, libsodium).
• Kotlin Multiplatform or sharing logic across platforms.
• Calling Rust from mobile via FFI (UniFFI or similar).
• Accessibility and localisation experience.
• Apps or open-source work you can show us.