Senior iOS Developer (Swift)- US Only (no agencies)

Job Objective

We are looking for a Senior iOS Developer to join an existing project where we have end-to-end ownership of both backend and mobile features. This is not a typical CRUD application. The role requires strong expertise in native Swift development, concurrency/thread safety, real-time networking, and working closely with AWS serverless backends.

You will be working on an existing codebase with significant technical debt and will be expected to troubleshoot, enhance, and explain complex code changes to stakeholders.

Requirements

Extensive experience with native iOS development using Swift

Strong understanding of Swift concurrency, thread safety, race conditions, GCD, and async/await

Experience debugging complex production issues in large codebases

Strong networking architecture experience (REST APIs, WebSockets, offline sync, retries, background processing)

Experience integrating mobile applications with AWS-based backend services

Working knowledge of AWS Lambda, S3, API Gateway, and serverless architectures

Ability to understand and troubleshoot backend workflows written in Node.js

Experience working with PostgreSQL or Aurora PostgreSQL databases

Experience working in existing/legacy codebases with significant technical debt

Experience building real-time calling features in iOS apps using WebRTC, including both one-to-one calls and group calling functionality.

Ability to perform root-cause analysis and explain technical changes to stakeholders

Comfortable taking ownership of features from mobile client through backend services and database layers

Technology Stack

Native iOS (Swift)

AWS Lambda (Node.js 24)

Aurora PostgreSQL

S3

Serverless Framework

Note: Experience with agentic AI development tools (especially Claude) is strongly preferred; candidates must be willing to quickly adopt AI-assisted development workflows.