Ernesto Valdez

R

Reserhub

April 2025 - Present

Mobile Engineer Tech Lead

I lead the mobile platform squad for the B2B vertical: the architecture, shared code and delivery process Reserhub uses to ship some 20 ticketing apps for bus lines.

• Designed and led the consolidation into a Turborepo and Expo monorepo with shared packages and per-tenant configuration: the core of a platform of some 20 apps across four repositories.
• Moved the enterprise apps’ checkout funnel to a hybrid architecture — a native shell embedding the web funnel, with native bridges for session, payments and deep links — validated with an A/B test and rolled out brand by brand.
• Leading the migration of the Reservamos B2C app to the new platform with screen and analytics parity; split another branded app into its own repository, upgraded to Expo 58 and React 19.
• Consolidated onto Expo and React Native an ecosystem carrying legacy stacks (native Swift and Java, Xamarin.Forms, Flutter, old Expo), brand by brand, with screen and analytics parity, an A/B test, feature flags and staged rollouts so sales never stopped.
• Built and shipped the apps’ remote configuration admin, with an MCP server so AI agents can read and publish configurations.
• Standardized the EAS pipeline and raised monorepo test coverage from 72% to 90%, with every app in it at 100% line coverage.
• Made an AI-assisted development loop (Compound Engineering + OpenSpec) mandatory across the mobile repos, with quality and security gates and human review.
• Coordinate five engineers through weekly 1:1s, design and code reviews, ADRs, seven-week planning cycles and a full-platform learning program.

R

Reservamos

May 2021 - April 2025

Lead Mobile Engineer

Led mobile development for the B2C vertical and the apps for enterprise bus lines, with a team of up to six engineers.

• Maintained and evolved the Reservamos app on Expo and React Native, with the native Adyen and Riskified integrations wrapped in internal native libraries with React Native bridges, and brought it into the unified codebase for enterprise clients as one more brand.
• Automated builds and store publishing with EAS and scripts shared across apps, adopted OTA updates and kept the Expo SDK current on the way to the React Native New Architecture.
• Co-built Bus Tracker, a multi-tenant fleet tracking platform with a Rails backend, web dashboard and driver app.
• Built the Vanda and Roll&Bits passenger and driver apps with Flutter.
• Wrote the mobile team’s career ladder and interviewed candidates for the team.

C

Chib

July 2020 - May 2021

Tech Lead

Built new iOS and Android apps in Flutter for CHIB MX and CHIB USA for instant remittance transfers; developed and maintained the landing page and CMS admin in Angular 11; built microservices on Node.js/Express and Python/Flask; configured the Kong API Gateway; deployed the microservices to AWS with Jenkins and Docker; maintained a WhatsApp bot on Twilio; and handled app releases to Google Play and the App Store.

B

BUSSI

October 2019 - March 2020

Flutter Mobile Developer

Developed and maintained the BUSSI and BUSSI Driver apps, cross-platform applications built with Flutter. Worked with Dart, Swift, Java and Kotlin; GraphQL, Redux, Fastlane, Firebase and WebSockets; and released the apps to the Google Play Store and Apple App Store.

C

CANTEC

January 2019 - September 2019

Sr. Mobile App Developer

Built cross-platform mobile apps with Xamarin Forms and React Native, supported the FamilyCard, MediChat and Multidoctores apps, designed UI/UX and programmed in .NET, JS, Java and Objective-C for iOS, Android and UWP. Released the apps to the Google Play Store and Apple App Store, and managed Microsoft Azure for app operations.

S

SkyAlert

July 2017 - January 2019

IoT Hardware Engineer / Production Leader

Developed hardware and software using technologies such as the Internet of Things (IoT), cloud infrastructure and data analytics, along with seismic-study tools applied to the SkyAlert Network and to the evolution of the EPICENTER early-warning devices. I also led device supply efforts for commercial and corporate customers, building tools to make production and manufacturing resource planning more efficient.

SM

Service Management Solutions

June 2017 - July 2017

Motherboard Engineer Level 3

Repaired HP and Asus laptop and all-in-one motherboards at the surface-mount component level (BGA, QFN, SOD and SOT) using specialized equipment. Diagnosed faults and delivered fixes for commercial and enterprise warranty products, and handled quality control, inspection and testing of new electronic devices and the return of working units to the field.

GA

Grupo Avatecsys

September 2009 - March 2017

Head of Information Technology

Head of Technology at Grupo Avatecsys S.A., designing and planning projects that deliver solutions built on automated or remotely controlled electronic devices for production, security, disaster prevention and civil protection, which resulted in patent MX311249B for the Integrated Seismic Early Warning System. Other responsibilities included team management, voice and data network administration, technical support, staff training, customer service and electronic device repair.

UT

Universidad Tecnológica Fidel Velázquez

August 2009

Associate Degree (T.S.U.) in Mechatronics

Professional license 7133679

I learned to apply specialized technologies (robots, CNC lathes, programmable logic controllers, industrial computers) to implement partial or full automation solutions in manufacturing systems, ensuring their safe operation and the efficiency of their industrial processes.

CD

Colegio de Estudios Científicos y Tecnológicos del Estado de México

July 2006

Technician in Business Information Systems

Professional license 538848

I learned to propose information-system and database solutions, adopt new technology developments in administrative areas and evaluate their implementation within the organization, supporting executive decision-making and the productive and social development of the country.