Senior (iOS) Software Engineer

Navan
London, UK
28 days ago
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Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Experience level
Expert
Experience required
5 years minimum
Working hours
Regular working hours
Job source

Tech stack

Multitier Architecture A/B Testing Application Programming Interfaces (APIs) Artificial Intelligence Data Analysis App Store (IOS) Software Quality Push Technology IOS SDK JSON Machine Learning Model View ViewModel
+15 more
Data Streaming Systems Integration WebSocket Data Logging Uikit GitHub Copilot Swiftui Large Language Models Prompt Engineering Offline Storage Backend Modularization Information Technology Low Latency Restful APIs

Job description

We’re building the next generation of travel and expense (T&E) technology using AI and large language models. Our mobile platform blends cutting-edge AI with strong product and UX so travelers get an intelligent companion, not just another booking app. The app should understand needs, anticipate requests, and deliver personalized help through conversational UI and rich, immersive interactions.

You’ll work at the intersection of AI and mobile, helping define how travelers interact with this kind of product on iOS.

What You’ll Do:

  • Design and ship innovative UX patterns for conversational interfaces and AI-driven experiences on iOS
  • Architect and build Swift-first, production grade features using async/await, structured concurrency and modern iOS APIs
  • Lead implementation of context-aware experiences using behavior, preferences, and app state with an emphasis on performance and privacy
  • Use metrics, experimentation, and validation (analytics, A/B tests, logging) to iterate on features and improve quality over time
  • Turn complex AI/ML capabilities into simple, intuitive mobile interactions
  • Use AI tools (e.g., Claude Code / LLM-based coding assistants) to accelerate development while maintaining a high-quality, well-tested codebase
  • Collaborate across product, design, and backend in a fast-moving environment

Requirements

  • 5+ years of professional development experience with strong Swift skills, building high quality iOS apps
  • Deep understanding of Swift and the iOS SDK, including: *

  • Swift concurrency (async/await, Task, actors), structured concurrency, and modern GCD usage
  • SwiftUI for building production UIs; familiarity with UIKit and interoperability is a plus
  • Experience with Combine or other reactive patterns, and when to prefer them vs. async/await
  • Strong grasp of iOS architecture (e.g., MVVM, Clean Architecture, modularization) suitable for AI-powered, stateful, and real-time features
  • Solid understanding of JSON, REST, WebSockets, streaming APIs and robust networking layers (error handling, retries, offline support)
  • Experience with offline storage, background processing, threading and push notifications
  • Curiosity about new interaction models (chat, agents, multimodal UI, etc.)
  • Experience using AI development tools (e.g., Claude Code, GitHub Copilot, etc.) as part of your workflow, with good judgment about code quality and security
  • Familiarity with LLM-driven features (prompt design, integrating LLM APIs, handling latency, fallbacks, guardrails) and/or conversational UX
  • Track record building consumer-facing apps; ideally you’ve shipped to the App Store and iterated from user feedback and metrics
  • BS in Computer Science or related technical field

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Good distractions

Talks and stories from around this role — technically off-topic, practically not.

4:12 min

Shifting from AI features to AI-assisted iOS development

MIlan Todorović MIlan Todorović · World Congress 2026 Europe

2:32 min

Refactoring bulk frontend operations into scalable backend methods

Noam Honig · LIVE

2:49 min

Adding a custom long press gesture to the tab bar

Moh’d Abualhuda +1 · World Congress 2023

3:47 min

Exploring JSON, CBOR, and JOSE for data serialization

Aaron Russell · LIVE

1:38 min

Transitioning into backend engineering from web development

Stefan Lingler Stefan Lingler +1 · Coffee With Developers

1:12 min

Choosing TypeScript for complex backend applications

Maximilian Otto Maximilian Otto · World Congress 2024

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