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Michaël Wilfried YAO

@michalwilfriedyao

Senior Software Engineer at KitmanLabs; built Passumo, a loyalty platform syncing Apple and Google Wallet passes in real time.

United Kingdom

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At KitmanLabs, I build production React and React Native features for clients including Major League Soccer. I also architected an interactive football-pitch visualization and won Most Innovative at the internal AI hackathon for a React Native app that turns match and session data into coaching insights.

I founded Passumo, a digital loyalty platform for local hospitality and retail merchants, and designed, built, and operate it end-to-end. Its in-store scanner connects to Apple and Google Wallet, with real-time pass synchronization so counter-side stamps propagate to customers’ devices.

At Uptime App, I built and shipped mobile features, mentored junior developers, and improved app performance through targeted refactors. At Upgrade Pack, I shipped a cross-platform React Native app and web admin portal against live airline and hotel APIs.

Earlier, as a Full-Stack React / Node Developer on contracts, I worked on projects for Société Générale, Canal+ / Ekino, NextRadioTV, and Ad4screen. I build across mobile, web, and backend systems, including the testing and deployment work that keeps production applications running.

Experience

Work history, roles, and key accomplishments

Current

Founder & Full-Stack Engineer

Current

Passumo

Jan 2026 - Present (9 months)

Designed, built, and operate a digital loyalty platform for local merchants, issuing branded cards into Apple and Google Wallet. Implemented real-time state synchronization and the transactional surface for in-store scanning and payments.

React 19 React Native NodeJS Fastify PostgreSQL Supabase Apple PassKit APIs Google Wallet Stripe AWS CI CD PWA

Current

Software Engineer

Current

KitmanLabs

Oct 2022 - Present (4 years)

Build production React and React Native features for clients including Major League Soccer, shipping under tight timelines. Architected an interactive football-pitch visualization and led quality improvements including Enzyme to React Testing Library migration and Playwright E2E.

React React Native React Testing Library Playwright CI CD Husky Git

Mobile Developer

Uptime App

Dec 2020 - Aug 2022 (1 year 8 months)

Built and shipped mobile features across cross-functional product and design teams, driving user engagement and growth. Mentored junior developers and set coding standards that lifted team velocity and quality.

React Native Mobile Development Code Review Mentorship Performance Optimization

Mobile Developer

Upgrade Pack

Jan 2019 - Nov 2020 (1 year 10 months)

Built and shipped a cross-platform React Native iOS/Android app plus its web admin portal against live airline and hotel APIs. Owned end-to-end and unit testing (Detox, Jest) and CI (CircleCI), plus a reusable component architecture and animations.

React Native iOS Android Detox Jest CircleCi API Integration Component Architecture

Full-Stack React / Node Developer

Contracts

Jan 2016 - Dec 2018 (2 years 11 months)

Worked on multiple projects including Société Générale (IFRS16 leasing platform), Canal+ / Ekino (MyCANAL), NextRadioTV (BFM TV, 01Net back-office), and Ad4screen. Used React, Redux, Node/Fastify, GraphQL, and PostgreSQL.

React Redux NodeJS Fastify GraphQL PostgreSQL