Senior iOS Engineer

OSSTAP; Kolkata District; Remote; INR 2,500,000 - 4,000,000; Full time

Benefits offered by this job

MacBook Pro hardware

Learning & conference allowance

Medical insurance

Remote-first work environment

Job summary

Osstap is seeking a Senior iOS Engineer to lead the design and development of mission-critical mobile apps for startups and enterprises. You will champion best practices, architect fluid 120Hz interfaces, and build offline-first synchronization layers.

You will deliver high-performance apps using Swift/SwiftUI, collaborate with backend teams on REST/GraphQL, and ensure robust persistence with SwiftData/CoreData/SQLite. Remote-first, top-tier learning and medical benefits offered.

Qualifications

• 5+ years of professional native iOS development experience.
• Deep proficiency with modern Swift, SwiftUI, Combine, and modern Swift Concurrency (async/await, Actors).
• Strong understanding of architectural patterns (MVVM, Clean Architecture, Composable Architecture).
• Proven track record shipping multiple top-rated apps to the Apple App Store.
• Solid understanding of memory management, Instruments profiling, and battery/network optimization.
• Excellent communication skills and ability to operate effectively in an asynchronous, remote-first team.

Responsibilities

• Architect, develop, and maintain high-performance native iOS applications using Swift and SwiftUI
• Collaborate with backend architects to design clean, high-throughput REST and GraphQL contracts
• Implement robust local persistence and offline sync engines using SwiftData, CoreData, or SQLite
• Write comprehensive unit and UI test suites achieving high code coverage and reliability
• Automate build, code signing, TestFlight distribution, and App Store releases via Fastlane and CI/CD
• Conduct thorough code reviews and mentor intermediate mobile developers

Skills

Native iOS development

Swift

SwiftUI

Combine

Modern Swift Concurrency

MVVM / Clean Architecture / Composable

REST & GraphQL

SwiftData / CoreData / SQLite

Xcode

Testing (unit/UI)

CI/CD / Fastlane

Open-source / blogging

React Native

Flutter

Kotlin Multiplatform

APNs / Live Activities

Tools

SwiftData

CoreData

SQLite

Xcode

TestFlight / CI/CD

Job description

About The Role

As a Senior iOS Engineer at Osstap, you will spearhead the design and development of mission-critical mobile applications for ambitious venture-backed startups and established enterprises. You will champion modern iOS engineering best practices, design fluid 120Hz gesture-driven interfaces, and build resilient offline-first synchronization layers.

Key Responsibilities

• Architect, develop, and maintain high-performance native iOS applications using Swift and SwiftUI
• Collaborate with backend architects to design clean, high-throughput REST and GraphQL contracts
• Implement robust local persistence and offline sync engines using SwiftData, CoreData, or SQLite
• Write comprehensive unit and UI test suites achieving high code coverage and reliability
• Automate build, code signing, TestFlight distribution, and App Store releases via Fastlane and CI/CD
• Conduct thorough code reviews and mentor intermediate mobile developers

Qualifications & Requirements

• 5+ years of professional native iOS development experience
• Deep proficiency with modern Swift, SwiftUI, Combine, and modern Swift Concurrency (async/await, Actors)
• Strong understanding of architectural patterns (MVVM, Clean Architecture, Composable Architecture)
• Proven track record shipping multiple top-rated apps to the Apple App Store
• Solid understanding of memory management, Instruments profiling, and battery/network optimization
• Excellent communication skills and ability to operate effectively in an asynchronous, remote-first team

Nice to Have

• Experience with cross-platform frameworks (React Native, Flutter) or Kotlin Multiplatform
• Familiarity with iOS background tasks, Push Notifications (APNs), and Dynamic Island / Live Activities
• Active contributor to open-source Swift packages or tech blogging

What We Offer

• Competitive global compensation package with annual review
• Top-tier MacBook Pro M-series hardware setup
• Annual $2,000 learning & conference allowance
• Comprehensive medical insurance coverage for you and family
• Flexible, remote-first work environment