Senior Front-end Engineer

London, UK | ramon.polidura.rueda@gmail.com

Senior Frontend Engineer with 16+ years of experience building scalable web and mobile applications using TypeScript, React, and React Native. Experienced leading frontend teams, architecting complex UI systems, and delivering high-impact SaaS products across e-commerce, healthtech, and enterprise platforms.

Passion.io, London | Senior JavaScript Engineer | August 2025 – April 2026

  • Developed a cross-platform mobile UI using React Native and TypeScript, supporting 10k+ creators and millions of users, enabling scalable feature development and consistent user experience across platforms.
  • Engineered an AI-powered onboarding workflow using LLM APIs, personalising the first-time user experience and improving user activation and onboarding efficiency.
  • Designed and implemented a scalable React Native component architecture, improving maintainability and accelerating feature development across the mobile codebase.
React NativeTypeScriptExpo.ioGraphQLJest

Collekt.ai, London | Lead Front-end Developer | October 2024 – May 2025

  • Led a team of 3 front-end developers, managing hiring, sprint delivery, and technical direction, enabling rapid feature delivery and consistent release cycles.
  • Designed and implemented an AI-powered chat interface using React, Remix, and LLM APIs, enabling agents to automate customer interactions and improve operational efficiency.
  • Delivered and scaled three React and Remix applications serving hundreds of thousands of users, refactoring a legacy codebase to improve performance by 40% and enhance user experience.
React.jsTailwindTypeScriptRemix

Silicon Rhino, London | Senior Front-end Developer | July 2020 – September 2024

  • Built web applications for multiple startups using React, Next.js, and Node.js, launching MVPs for e-commerce, investment, and healthcare platforms used by thousands of users.

  • Mentored junior developers and led workshops, improving team productivity and adoption of modern frontend practices.

ReactNext.jsNode.jsMobXMaterial UICypressReact Testing Library

Heydoc, London | Front-end Developer | October 2018 – June 2020

  • Built a React-based clinic management platform used by thousands of doctors across the UK, improving usability and performance in a fast-paced healthtech startup.

AND Digital, London | Front-end developer | June 2017 – August 2018

  • Delivered front-end features for major clients including TalkTalk and House of Fraser, reaching hundreds of thousands of users across high-traffic consumer platforms.

Zappi, London | Front-end Developer | May 2017 – November 2017

  • Developed JavaScript front-end features for a SaaS consumer insights platform used by global brands to evaluate advertising, product concepts, and marketing campaigns.

Playtech, London | Front-end Developer | November 2013 – November 2015

  • Developed JavaScript UI components for online casino and gaming platforms, delivering interactive gambling experiences including slots, bingo, and game animations

Gimo Global Interactive Marketing Online, London | JavaScript Developer | September 2012 – November 2013

  • Developed user-facing JavaScript features for large-scale online betting platforms, supporting sports betting, slot games, and third-party gaming integrations.

TN Solutions, London | JavaScript Developer | December 2011 – November 2012

  • Designed websites for small business including a complete CMS in Joomla with online bookings, invoicing, online orderings, receipts, reports and e-commerce.