Senior Mobile Engineer — iOS & Android

About AceSpeak

AceSpeak is an AI-powered interview and public-speaking coach for iOS and Android. It helps users practise interviews and presentations through structured feedback. AceSpeak is a product brand operated by Wistkey UK Limited.

The role

Build and improve AceSpeak's native iOS and Android app experience. You will work on recording, playback, user feedback and progress-tracking features while helping turn an early MVP into a reliable, well-structured product.

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, backend and AI teams
• Support App Store and Google Play release processes
• Help establish maintainable engineering practices as the product grows

What we are looking for

• 5+ years in mobile engineering
• Strong native iOS or Android development experience, with willingness to work across both platforms
• Experience shipping and maintaining production mobile apps
• Solid API integration, debugging, testing and performance skills
• A pragmatic, product-minded approach
• Good written English and strong collaboration skills

Nice to have

• Audio or video capture and playback experience
• Flutter or React Native experience alongside native development
• Subscription, analytics or mobile accessibility experience
• Experience helping an MVP mature into a structured product

AceSpeak candidate exercise

All applicants are required to complete this 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. Include a screenshot showing your score and display name with your application. 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 [email protected] and we will arrange complimentary access or an equivalent alternative exercise.

Location and package

Full-time remote or London-based role for candidates in the United Kingdom. £60,000–£80,000, depending on experience.

How to apply

Apply here: https://acespeak.uk/careers/senior-mobile-engineer-uk/

Questions or adjustment requests: [email protected]

Explore AceSpeak careers: https://acespeak.uk/careers/