Available for projects · London / remote

Senior engineer for product teams

React, Next.js, React Native, Node.js. I own the product end to end, ship it, and get the rest of the team up to speed.

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Ramón Polidura · London, UK

Ramón Polidura, senior frontend engineer

Proof

Recent outcomes from product work, not a list of responsibilities.

+20%

revenue

at Collekt.ai, from the agent-facing chatbot

10k+

end users

on the LLM onboarding flow at Passion.io

Led 3

frontend engineers

remote, across a multi-product platform

More on how I work with teams

How I work

I join product teams, take ownership, and leave the frontend and the people around it stronger.

Contract

Typically product teams, 3 to 6 months. I join as a senior frontend, not a ticket mill.

London or remote

UK-based. Hybrid in London, or fully remote with overlap that works for the team.

Architecture, delivery, pairing

I own the frontend, ship it, and get the rest of the team up to speed.

How I work with a team

Stack I ship with

TypeScript-first React across web and native, plus the testing and delivery tools I actually use on contracts.

Core

  • TypeScriptTypeScript
  • ReactReact
  • Next.jsNext.js
  • ExpoExpo

Delivery

  • RemixRemix
  • Node.jsNode.js
  • TailwindTailwind

Testing

  • Testing LibraryTesting Library
  • JestJest
  • CypressCypress
  • StorybookStorybook

Tools

  • CursorCursor
  • GitHubGitHub
  • FigmaFigma
  • JiraJira

Recent contracts

The last two product contracts, plus the agency work that came before.

Passion.io, LondonSenior Frontend Developer (contract)August 2025 – April 2026

  • Designed and delivered an LLM-powered creator onboarding flow: chatbot-guided AI avatar setup with voice recording, colour picking, and UI generated dynamically from user input and model output.
  • Architected the frontend, wrote delivery tickets, and mentored three senior developers through daily pair programming.
  • Delivered product UI across Android, iOS, and desktop for a mobile app builder serving 10k+ creators.
React NativeTypeScriptExpoGraphQLJest

Collekt.ai, LondonLead Frontend Developer (contract)October 2024 – May 2025

  • Increased collections and revenue by 20% by shipping an agent-facing chatbot for live end-user conversations.
  • Led a team of three remote frontend engineers, setting architecture, component conventions, and test coverage standards across the platform's product suite.
  • Built a dynamic agentic campaign generator with AI analysis of results, giving non-technical managers one UI to launch and tune campaigns.
  • Built the end-user chatbot experience, lifting engagement across the collections journey.
ReactRemixTailwindTypeScript

Silicon Rhino, LondonFrontend DeveloperJuly 2020 – September 2024

  • Most senior frontend engineer across five client products, owning component libraries, routing, server-side rendering, and deployment from MVP to production.
  • Shipped an e-commerce platform, a healthtech clinic management system, and a cross-platform adventure sports app for iOS and Android.
  • Migrated the shared codebase to the Next.js 13 app router behind new client projects, onboarding the wider team and pair programming to apply it to live work.
ReactNext.jsNode.jsMobXMaterial UICypressReact Testing Library

Full CV available

Available for senior frontend contracts

London or remote. I join product teams, own the frontend, and integrate APIs into it.

Hire meNeed a website instead?