Senior / Lead iOS Developer - NYC

Nexiva Inc; New York (NY); On-site; USD 150,000 - 190,000; Full time

Job summary

Nexiva Inc. seeks a Senior iOS Developer to design and optimize enterprise iOS apps for investment banking clients in New York City. You will own advanced Swift-based UI and architecture, delivering ultra-fast, secure mobile experiences for high-frequency data.

The role demands deep expertise in Swift, Combine/SwiftUI, and AWS cloud-native backends, with on-site collaboration and a focus on performance, security, and reliability in a demanding financial environment.

Qualifications

• 6+ years of native iOS development with Swift.
• Experience in investment banking/financial domains preferred.
• Proficient in Swift Concurrency (async/await, Actors) and GCD.
• Proficient with AWS cloud services integration.

Responsibilities

• Architect, build, and maintain native iOS applications adhering to modern patterns.
• Render high-frequency UIs handling real-time market data without main-thread blocking.
• Integrate AWS services and secure network communications.
• Tune performance using Xcode Instruments and optimize memory usage.
• Implement security measures including OAuth2/OIDC and biometrics.
• Lead automated testing and CI/CD workflows.

Skills

Swift

iOS development

High-performance mobile architectures

AWS

Swift Concurrency

Networking

Tools

Xcode Instruments

AWS SDK for Swift

Fastlane

GitHub Actions

Job description

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

Local Only

Zoom and on site interview

3 days on-site in NYC

Must have Investment banking experience - recent

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.