Kes Walker

Senior Android engineer with 8+ years shipping production apps to millions of users. I refactored the UK's #1 betting app at Sky Bet, taking test coverage from 50% to 90% and standing up the CI/CD pipelines, then went on to build and ship my own products end to end. Today I run Explorer Innovations, building AudaTours across Android, iOS, and web. 6 apps shipped, 3 platforms, open to anything interesting.

Available for work

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Timeline

2023 - present

Founder & Engineer

AudaTours / Explorer Innovations Ltd

Full-time on my own startup. Building the product, running the business, shipping across Android, iOS, and web.

2021 - 2023

Android Engineer

Sky Betting & Gaming

Led a major refactor of the Sky Bet Android codebase to MVVM/Clean Architecture, drove unit test coverage from ~50% to ~90%, and set up the CI/CD pipelines with automated test gates. Championed early Jetpack Compose adoption on the UK's #1 sports betting app (4.7 stars, 1M+ installs, millions of daily users).

2018 - 2021

Software Engineer (Apprentice to Mid)

Worldline UK&I

Started as an apprentice. Progressed to Android engineer. 3 years of hands-on mobile development.

2019 - 2021

Founder (Side Project)

Speed Languages

Built and published a language learning app across 8 locales, plus a number training app, while working full-time. Early proof I could ship products solo.

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Projects

AudaTours

Founder

★★★★★

4.9

↓ 1,000+

AI-generated audio tour platform covering 2,000+ cities in 40+ languages. An automated content pipeline handles research, script generation, and audio production at scale. The app features GPS-triggered playback, offline-first maps and audio, Mapbox routing, in-app purchases, batch translation across 40+ languages, and an agentic AI support system. Built the full stack solo: Kotlin/Compose Android app, Swift/SwiftUI iOS app, Angular SSR web platform, and 200+ Firebase cloud functions.

Kotlin Compose Swift SwiftUI Angular 20 Firebase LLM Agents ElevenLabs Mapbox RevenueCat Stripe Algolia

Google Play App Store Website

Sky Bet

Engineer

★★★★★

4.7

↓ 1,000,000+

The UK's #1 sports betting app: 1M+ installs, 4.7 stars, millions of daily users. I led a major refactor of the codebase to MVVM/Clean Architecture, drove unit test coverage from ~50% to ~90%, and stood up the CI/CD pipelines with automated test gates. Also championed early Jetpack Compose adoption with a proof-of-concept home page redesign. My strongest engineering work at scale.

Kotlin Clean Architecture Testing 50→90% CI/CD Compose

Google Play

Explorer

Founder

★★★★★

4.6

↓ 10,000+

The original audio tours app that became AudaTours. Designed, built, and launched the original concept end-to-end, from idea to Play Store. Where the journey started.

Kotlin Android Firebase