Senior (iOS) Software Engineer

Navan
London, United Kingdom

Who this role is best for

Strong fit for iOS developers with AI integration experience who design conversational interfaces and build stateful, real-time features.

Best fit for

  • Candidates with 5+ years of iOS development experience and a track record of shipping consumer apps
    — “5+ years of professional development experience with strong Swift skills, building high quality iOS apps
  • Individuals who have experience integrating AI and LLM features into mobile applications
    — “Familiarity with LLM-driven features (prompt design, integrating LLM APIs, handling latency, fallbacks, guardrails)
  • Professionals with a background in creating immersive, context-aware UIs using SwiftUI or UIKit
    — “Deep understanding of Swift and the iOS SDK, including SwiftUI for building production UIs

Things to consider

  • The role requires a strong grasp of Swift concurrency and modern APIs, which may demand recent technical focus
    — “Swift concurrency (async/await, Task, actors), structured concurrency, and modern GCD usage

How to stand out

  • Highlight experience with AI/ML integration in mobile apps and your use of AI tools like GitHub Copilot
    — “Use AI tools (e.g., Claude Code / LLM-based coding assistants) to accelerate development
  • Emphasize your ability to design and implement conversational UIs and stateful features
    — “Design and ship innovative UX patterns for conversational interfaces and AI-driven experiences on iOS
  • Showcase your knowledge of iOS architecture like MVVM and Clean Architecture in your portfolio or resume
    — “Strong grasp of iOS architecture (e.g., MVVM, Clean Architecture, modularization)
  • Demonstrate your experience with networking layers, including REST, WebSockets, and offline support
    — “Solid understanding of JSON, REST, WebSockets, streaming APIs and robust networking layers
  • Include examples of how you've used metrics and A/B testing to improve feature quality and user experience
    — “Use metrics, experimentation, and validation (analytics, A/B tests, logging) to iterate on features
Pace · Fast PacedCollaboration · HighAutonomy · MediumDecision Impact · Team

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

  • Design and ship innovative UX patterns for conversational interfaces and AI-driven experiences on iOS
Typical background
5+ years of professional development experience with strong Swift skills, building high quality iOS apps

Skills & requirements

Required

SwiftIos SDKAsync/awaitStructured ConcurrencyCombineMVVMClean ArchitectureJSONRESTWebsocketsOffline StorageBackground ProcessingThreadingPush NotificationsAi/ml IntegrationLlm-driven Features

Preferred

UikitLlm-assisted Development

Stack & domain

SwiftAsync/awaitStructured ConcurrencyModern Ios ApisCombineUikitJSONRESTWebsocketsStreaming ApisOffline StorageBackground ProcessingThreadingPush NotificationsLlm-driven FeaturesPrompt DesignIntegrating LLM ApisHandling LatencyFallbacksGuardrailsC++PythonBayesian StatisticsLeadershipCommunicationAIMobileTravel And Expense (t&e) TechnologyLarge Language ModelsConversational UIImmersive InteractionsAi/mlAutonomous Driving

About the role

Original posting from Navan

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

What We're Looking For: 

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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Source: Navan careers

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