Looking for a job

Carlos Jiménez

@carlosjimnez

Principal software engineer focused on frontend product engineering, architecture, and design systems—building end-to-end value.

Spain

Message

What I'm looking for

I’m looking to build real products end-to-end, with strong frontend architecture and design systems. I want a team that embraces testing, coding standards, and clear engineering workflows (feature flags, CI), and lets me push thoughtful change.

I’ve been programming since I was 12, and I’ve always wanted to focus on building products. I started as a web developer and got “caught up in the React wave since the beginning,” so frontend engineering became my primary strength, even though I’ve done backend too.

At Persefoni, I joined as a Senior Software Engineer consultant and was promoted to Principal after two years. I led a product team and was “one of the main contributors and change driver,” concentrating on developing the product and shaping how we work.

My impact shows up in the way we engineered: I helped start unit and end-to-end testing and folded it into our CI with coding standards. I also drove the implementation of a new design system using Storybook and contributed to breaking down a monolithic app into a monorepo with more focused packages.

Before that, at TomTom Telematics (Webfleet), I joined as a Full-Stack Software Engineer and was promoted to Senior. Even in full-stack roles, my frontend expertise consistently surfaced—leading rapid MVP delivery in React Native and teaching teams to adopt React when experience was limited.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Persefoni

Sep 2020 - Sep 2025 (5 years)

Joined Persefoni as a Senior Software Engineer consultant and was promoted to Principal. Led product development for a Next.js/TypeScript React app, driving CI/testing practices, introducing a Storybook design system, improving architecture (monorepo/feature flags), and moving from GraphQL to a simpler REST-based library.

Next.js React TypeScript styled components GraphQL TurboRepo Pnpm Jest Playwright Storybook Datadog Auth0 Go AWS CI CD

Full-Stack Software Engineer

Webfleet

Jun 2017 - Sep 2020 (3 years 3 months)

Worked at TomTom Telematics (later renamed to Webfleet) as a Full-Stack Software Engineer and was promoted to Senior after two years. Built and evolved a fleet management platform with frontend-heavy expertise and helped lead the creation of a mobile MVP in React Native.

React Redux styled components Jest Java Spring Boot NPM REST APIs

Full-Stack Developer

Civiciti

Jun 2016 - Jun 2017 (1 year)

Worked as a Full-Stack Developer on an e-democracy public engagement platform. Developed and supported the PHP (Yii) and jQuery-based application while introducing React and contributing through multiple crisis/rollout efforts.

Yii jQuery React CSS AWS

Frontend Developer

Onfan

Jun 2013 - Aug 2014 (1 year 2 months)

Worked as a Frontend Developer on a social network for foodies. Used AngularJS, PHP, and frontend tooling to implement a growth-hacking workflow that increased organic traffic.

SEO PHP AngularJS CSS JavaScript