Senior Mobile Engineer

Seamless; Greater London; Hybrid; GBP 110,000 - 170,000; Full time

Job summary

Seamless in London is seeking a senior mobile engineer to own end-to-end iOS and Android development, setting performance bars and shipping features the customers rely on daily. You will lead architecture and release cadence across platforms, mentor a growing team, and partner with the founder to drive the mobile roadmap.

A track record of shipping native apps and strong design instincts is essential. Production experience on public apps and a passion for pixel-perfect details will help you

Qualifications

• 10+ years of engineering experience with senior production apps.
• Proficient in Swift/SwiftUI and Kotlin/Jetpack Compose.
• End-to-end ownership of mobile projects across platforms.

Responsibilities

• Lead architecture, code quality, and release cadence for iOS and Android.
• Drive offline-first design and performance.
• Own the mobile roadmap with the founder.
• Mentor mobile specialists as the team grows.

Skills

Mobile architecture

Swift & SwiftUI

Kotlin & Jetpack Compose

Performance optimization

Education

Bachelor's degree in Computer Science

Tools

Xcode

Android Studio

Git

CI/CD pipelines

Job description

Own iOS and Android end to end. You will set the bar for performance and craft on the apps our customers use every day. This is a senior role: we expect 10+ years of professional engineering experience.

What you will do

• Lead architecture, code quality, and release cadence across both iOS and Android.
• Drive offline-first design and performance across both platforms.
• Own the mobile roadmap alongside the founder.
• Bring in and mentor mobile specialists as the team grows.

What you will bring

• 10+ years of engineering experience, with senior production experience shipping native iOS and Android apps.
• Deep fluency in modern Swift and SwiftUI, and in Kotlin and Jetpack Compose.
• A track record of owning mobile work end to end, not just contributing to it.
• Strong instincts for design and performance.

Nice to have

• Production experience on both platforms.
• Familiarity with the Salesforce mobile ecosystem.
• A public app on the App Store or Play Store you are proud of.

Who fits

You care about design as much as about code. You have opinions about button spacing, and you are usually right. You notice the misaligned pixel, the animation that is two frames off and the screen that takes a beat too long, and none of it lets you rest until it feels right. You know VoiceOver is not a checkbox but a user. You enjoy building new screens, and you take the same pride in keeping the old ones smooth. You ship every week.