AI / ML Engineer — Core Product AI

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.

The role

Join AceSpeak as an AI / ML Engineer and help build dependable AI capabilities, evaluation pipelines and data workflows for a better-structured product. You will work across speech, audio, video and multimodal signals, turning experiments into measurable product improvements.

Responsibilities

• Develop and improve AI/ML models and evaluation pipelines
• Analyse clip data and improve automation quality
• Integrate model outputs into the app experience
• Track model and product performance using clear metrics
• Collaborate with product, mobile and backend engineers
• Help establish reliable engineering and experimentation practices

What we are looking for

• 5+ years in AI/ML, ideally with audio, video or multimodal systems
• Strong Python and experience with PyTorch or TensorFlow
• Familiarity with signal processing, computer vision or speech analytics
• A pragmatic, product-driven approach
• Good written English and strong collaboration skills

Nice to have

• App-based AI or on-device inference experience
• Coaching, education technology or speech analytics background
• Privacy-sensitive data handling 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. £65,000–£90,000, depending on experience.

How to apply

Apply here: https://acespeak.uk/careers/ai-ml-engineer-uk/

Questions or adjustment requests: [email protected]

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