Senior Mobile Engineer — iOS & Android

AceSpeak; Greater London; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

AceSpeak is seeking a Senior Mobile Engineer to build and enhance native iOS and Android experiences. You will work on recording, playback, scoring, and progress-tracking features to help users practise speaking confidently.

Responsibilities include delivering native app features, improving media capture flows, ensuring stability in updates, and collaborating with product, design, and backend teams. Remote/hybrid within the UK, with London preference, and a salary of £60,000–£80,000 per year.

Qualifications

• 5+ years building mobile apps
• Experience with native iOS and Android development
• Experience with native audio/video capture and playback
• Strong English communication and collaboration skills

Responsibilities

• Develop native app features for iOS and Android
• Improve recording, playback and clip-review flows
• Ship app updates with strong stability and performance
• Collaborate with product, design and backend teams
• Support App Store and Google Play release processes

Skills

Swift/SwiftUI

Objective-C

Kotlin/Java

Audio/Video capture

Job description

AceSpeak is looking for a Senior Mobile Engineer to build and improve our native iOS and Android app experience. You will work on recording, playback, scoring and progress-tracking features that help users practise speaking confidently.

Responsibilities

• Develop native app features for iOS and Android
• Improve recording, playback and clip-review flows
• Ship app updates with strong stability and performance
• Collaborate with product, design and backend teams
• Support App Store and Google Play release processes

What we’re looking for

• 5+ years building mobile apps, preferably on both iOS and Android
• Strong Swift/SwiftUI or Objective-C skills, plus Kotlin/Java
• Experience with native audio/video capture and playback
• A user-focused approach and high attention to detail
• Good written English and strong collaboration skills

Nice to have

• App Store / Google Play release experience
• Subscription and in-app purchase experience
• Mobile accessibility and localisation knowledge

AceSpeak candidate exercise

All applicants are required to complete a short AceSpeak practice exercise and achieve a total AceSpeak score above 3,000 before submitting an application.

1. Download AceSpeak on iOS or Android.
2. DM @acespeak.uk on Instagram with the role title to request a complimentary analysis token. The token is issued privately; do not purchase a subscription or share it.
3. Record a 90-second to 2-minute response to: "Describe a product or project you helped improve and what you learned."
4. Practise and re-record until your total AceSpeak score is above 3,000.
5. Send us a screenshot showing your score and display name. Please do not send the recording.

The score is one part of a human-reviewed application process and is not used as the sole hiring criterion. If you cannot use Instagram, the app or the scoring format, need another token, or need a reasonable adjustment, email [e-mail] and we will arrange complimentary access or an equivalent alternative exercise.

Employment: Full time. Location: Remote / hybrid within the UK; London preferred. Salary: £60,000–£80,000 / year.