Description

I've been shipping software since 2018, delivering features to over 1,000,000 users across my career. For the past three years I've built multiple revenue-generating, AI-powered mobile apps from scratch as a solo founder: native iOS and Android apps, Flutter cross platform apps, Firebase backends, and the LLM/TTS content pipelines behind them.

I take AI features from idea to the App Store. If you need someone who can own the full stack (mobile app, backend, LLM integration) and deliver it clean, get in touch.

Industry field of expertise

Languages

English
Native or bilingual
Spanish
Basic

Workplace preferences

Can work on-site

Valencia (up to 50km)

AudaTours / Explorer Innovations Ltd
Founder & Engineer
DIGITAL AND IT
January 2023 - Today (3 years and 5 months)
Valencia, Spain
Running my own company full-time. Built AudaTours from scratch: Kotlin/Compose Android app, Swift/SwiftUI iOS app, Angular 20 SSR web platform, and 200+ Firebase cloud functions. 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. Tours served in 2,000+ cities. Also built TTS Audit, a B2B SaaS using PyTorch on serverless GPUs for TTS quality detection.
AI Automation Android iOS
Sky Betting & Gaming
Android Engineer
January 2021 - January 2023 (2 years)
Leeds, United Kingdom
Shipped key customer-facing features for Sky Bet, the UK's #1 sports betting app (4.7 stars, 1 M+ installs). Worked within a large engineering org on a high-traffic Kotlin codebase serving millions of daily active users.
Android Mobile Design Mobile development
Worldline UK&I
Android Engineer
January 2019 - January 2021 (2 years)
Nottingham, United Kingdom
Developed a rail ticketing mobile solution, taking it from a non-working state to production release on the Google Play Store. Progressed from apprentice to mid-level Android engineer over 3 years.
Android Mobile development Mobile Design

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Kes Walker

Android & iOS App Developer | Kotlin Swift Flutter

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