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Alex Hernandez Prat

@alexhernandezprat

Senior Software Engineer at UserTesting building reliable browser-based recording systems with React, TypeScript, and Chrome Extensions.

Spain

Message

At UserTesting, I build and maintain participant recording systems across Chrome Extensions MV3, service workers, offscreen documents, and participant-facing interfaces. I contribute to extensionless recording and a runtime-agnostic recording core, and improve reliability across screen and audio capture, recovery, and upload lifecycles.

Previously, I modernized UserZoom’s platform with React, TypeScript, and microfrontends, and led frontend development for the first release of a cross-platform fintech application at Rand App. At Tenkai, I delivered internal platforms with React, Python, and Django, owning delivery through deployment.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer - Frontend & Browser Platform

Current

UserTesting

May 2023 - Present (3 years 5 months)

Build and maintain participant recording systems using TypeScript, React, Lit, Chrome Extensions MV3, and modern Web APIs. Improve reliability for screen/audio capture, stream loss, and recording lifecycles.

TypeScript React LIT Chrome Extension MV3 Web APIs Service Workers Offscreen Documents MediaRecorder GetUserMedia GetDisplayMedia Document Picture in Picture Dependency Injection Datadog Rum Accessibility

Senior Frontend Engineer

UserZoom

Jun 2022 - May 2023 (11 months)

Modernized the platform and supported its integration into UserTesting using React, TypeScript, and microfrontend architecture. Built accessible, reusable frontend capabilities and improved maintainability through code reviews and modern tooling.

React TypeScript Microfrontends Accessibility Code Review Modern Tooling

Frontend Lead

Rand App

Jun 2021 - Jun 2022 (1 year)

Led frontend development of the first release of a cross-platform fintech application built with React Native. Defined frontend architecture and reusable UI patterns, collaborating with design and backend teams to integrate distributed-ledger services.

React Native Frontend Architecture UI Patterns Distributed Ledger

Senior Full Stack Developer

Tenkai

Jul 2020 - Jun 2021 (11 months)

Designed and delivered internal platforms using React, Python, Django, and relational databases. Owned delivery from requirements and architecture through implementation and deployment on DigitalOcean.

React Python Django Relational Databases DigitalOcean

Full Stack Developer

IndianWebs

Sep 2018 - Sep 2020 (2 years)

Maintained and extended an internal intranet with PHP and MySQL, adding modules, strengthening authentication, and improving database functionality. Collaborated with stakeholders to translate operational needs into reliable internal web features.

PHP MySQL Authentication Databases