Senior / Lead iOS Developer

Stellent IT LLC; New York (NY); Hybrid; USD 140,000 - 190,000; Full time

Job summary

Stellent IT LLC in New York City is seeking a Senior/Lead iOS Developer to design, build, and optimize enterprise mobile apps for investment banking and high-performance cloud solutions. You will work on ultra-low latency mobile architectures, real-time data streams, and secure, scalable client experiences.

The role requires deep Swift expertise, proficiency with SwiftUI/UIKit, Combine, and AWS cloud-native backends.

Qualifications

• 6+ years of native iOS development with Swift.
• Investment Banking/Financial domain experience preferred (capital markets, high-frequency trading).
• Advanced Swift Concurrency (async/await, TaskGroup, Actors) and GCD mastery.
• AWS cloud infrastructure experience with iOS integration.

Responsibilities

• Architect, build, and maintain mission-critical native iOS apps using Swift, SwiftUI, UIKit.
• Render high-frequency UI with real-time tick data and analytics without main-thread blocking.
• Integrate AWS backend services (AppSync, API Gateway, Cognito) and networking layers.
• Profile with Xcode Instruments to optimize memory, CPU, and energy impact.
• Implement strong security using OAuth2/OIDC, Keychain, and pinning.

Skills

Swift

Swift Concurrency

GCD

Xcode Instruments

AWS integration

Combine

Architecture

Tools

AWS SDK for Swift

GraphQL AppSync

RESTful APIs

WebSockets

Fastlane

GitHub Actions

AWS Device Farm

Job description

Job Title: Senior/Lead iOS Developer Investment Banking & High-Performance Cloud Solutions

Location: NYC, NY (3 days onsite, 2 days remote in a week_ Local only)

Duration: Long term contract

Interview Process: Zoom and Onsite Interview

Position Summary:

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.

Key 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.

Required Qualifications:

• 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.

Preferred Qualifications:

• 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.

Dheeraj Galav

Senior Technical Recruiter

Email:
[e-mail]

Address:
505 Knolle Court
Saint Augustine, FL 32092

Telephone:
201-778-9266

www.stellentit.com