Senior iOS Engineer

Quadcode; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Remote work

20 days paid leave

AI tools access

Rewards marketplace

Job summary

Quadcode is seeking an experienced iOS engineer to evolve a widely used trading app through a major redesign and architectural improvements. The role blends platform-level engineering with hands-on development of user-facing features, including adaptive interfaces for various screen sizes and device families.

You will shape architecture, implement high-quality iOS features, integrate REST APIs, and ensure performance with Core Data, concurrency, and testing.

Qualifications

• Strong Swift skills with iOS SDK knowledge including UIKit, Core Data, and Core Animation.
• Experience with Auto Layout, Interface Builder, REST APIs, JSON, and persistent socket connections.
• Background maintaining and improving existing applications, and writing unit and UI tests; XCTest and Quick/Nimble experience is relevant.
• Knowledge of iOS architectural patterns (MVC, MVVM, VIPER) and modular project structure.
• Practical RxSwift experience and understanding of multithreading and async iOS programming.
• Experience with third‑party dependencies; fluent Russian and at least B1 English.

Responsibilities

• Shape application architecture and technical direction in a modular codebase.
• Build and improve iOS features, including programmatic interfaces and adaptive layouts.
• Integrate REST APIs and persistent socket connections.
• Work with Core Data, concurrency, and asynchronous operations for performance and stability.
• Refactor legacy code while preserving behavior and investigate bugs and performance issues.
• Maintain unit and UI test coverage and collaborate with QA, design, product, and engineering teams.

Skills

Swift

iOS SDK

UIKit

Core Data

Core Animation

Auto Layout

REST APIs

JSON

RxSwift

Multithreading

Unit/UI Testing

MVC/MVVM/VIPER

Russian (B1)

English (B1+)

Tools

Xcode

Git

CI/CD

Job description

Role overview

Help evolve a widely used iOS trading application through a major redesign, architectural improvements, and new product features. The role combines platform-level engineering with hands‑on development of user‑facing capabilities, including adaptive interfaces for different screen sizes and device families.

Responsibilities

• Shape application architecture and technical direction in a modular, multi‑module codebase.
• Build and improve iOS features, including programmatic interfaces and adaptive layouts.
• Integrate REST APIs and persistent WebSocket or other socket connections.
• Work with Core Data, concurrency, and asynchronous operations to support performance and stability.
• Refactor legacy code while preserving existing behavior, and investigate bugs and performance issues.
• Maintain unit and UI test coverage and collaborate with QA, design, product, and engineering colleagues.

Requirements

• Strong Swift skills and practical knowledge of the iOS SDK, including UIKit, Core Data, and Core Animation.
• Experience with Auto Layout, Interface Builder, REST APIs, JSON, and persistent socket connections.
• Background maintaining and improving existing applications, and writing unit and UI tests; XCTest and Quick/Nimble experience is relevant.
• Knowledge of object‑oriented design, iOS architecture patterns such as MVC, MVVM, or VIPER, and modular projects.
• Practical RxSwift experience, plus an understanding of multithreading and asynchronous iOS programming.
• Experience with third‑party dependencies; fluent Russian and at least B1 English.

Nice to have

• Experience with fintech, trading, or other high‑load products with large user bases.
• Basic C++ knowledge or experience connecting Swift code with C++.

Benefits and work setup

• Full‑time remote work under a service‑provider contract, with compensation in euros and 20 paid days off annually.
• Corporate access to AI tools and a rewards marketplace that includes products and language courses.
• Opportunity to contribute ideas and influence architecture and technical direction. The team uses two‑week Scrum sprints and AI tools in development, reviews, debugging, and problem‑solving.