Senior, Lead iOS Developer

Connvertex Technologies • New York City, NY

3d

About The Position

We are seeking an exceptionally skilled Senior iOS Developer with deep expertise in Swift, high-performance mobile architectures, and AWS cloud-native backends. In this role, you will lead the design, development, and optimization of enterprise mobile applications servicing institutional clients, investment bankers, and high-frequency traders. The ideal candidate thrives at the intersection of ultra-low latency mobile engineering and complex financial systems—building responsive UIs capable of processing thousands of market ticks per second while maintaining enterprise-grade security and sub-millisecond thread execution.

Requirements

• 6+ Years of professional native iOS development using Swift.
• Investment Banking / Financial Domain Experience: Direct experience developing capital markets, wealth management, or high-frequency trading platforms (handling execution order books, streaming FX/equities/bonds data, portfolio risk analytics).
• Advanced Concurrency Mastery: Expert knowledge of Swift Concurrency (async/await, TaskGroup, Actors) and Grand Central Dispatch (GCD) for lock-free, thread-safe data structures.
• AWS Cloud Infrastructure: Proven experience integrating iOS applications with AWS services (AWS SDK for Swift, API Gateway, AppSync, Cognito, Lambda, S3, DynamoDB).
• Reactive Frameworks: Deep experience with Combine or RxSwift for complex, high-volume event stream handling.
• Instruments & Profiling: Advanced proficiency with Xcode Instruments for tracking allocations, CPU bottlenecks, leaks, and energy impact.

Nice To Haves

• Hands-on experience with streaming message protocols (WebSockets, gRPC, Protobuf).
• Solid understanding of financial compliance requirements (FINRA, SEC, GDPR) and secure audit logging.
• Custom graphics rendering experience using Metal, Core Graphics, or Swift Charts for custom market indicators.

Responsibilities

• Architecture & Native Development: Architect, build, and maintain mission-critical native iOS applications using modern Swift (Swift 5.9+, Combine, SwiftUI, UIKit) adhering to clean patterns (MVVM-C, The Composable Architecture).
• High-Throughput UI Rendering: Engineer high-frequency, responsive interfaces handling real-time tick data, live order book depth, and interactive portfolio analytics without main-thread blocking or frame drops.
• AWS Integration & Networking: Implement robust, resilient networking layers utilizing the AWS SDK for Swift, WebSockets, RESTful APIs via AWS API Gateway, GraphQL (AWS AppSync), and intelligent offline caching.
• Concurrency & Memory Tuning: Utilize Xcode Instruments (Time Profiler, Allocations, Leaks) to eliminate retain cycles, optimize memory usage, manage Swift Actors/async-await pipelines, and ensure maximum execution speed.
• Financial-Grade Security: Implement end-to-end security protocols including OAuth2/OIDC via AWS Cognito, biometrics (FaceID/TouchID), hardware-backed Keychain storage, certificate pinning, and zero-trust encryption standards.
• DevOps & Quality Assurance: Drive automated testing strategies (XCTest, XCUITest) and continuous deployment workflows via Fastlane, GitHub Actions, and AWS Device Farm.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed