Eduardo Sanz Martin, Developer in Koumac, North Province, New Caledonia
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Eduardo Sanz Martin

Verified Expert  in Engineering

Front-end Developer

Koumac, North Province, New Caledonia
Toptal Member Since
June 25, 2021

Eduardo is a front-end developer with over four years of varied, international professional experience, including working as a consultant for Accenture in Budapest and as an employee for a small online language education company in Paris. Currently, Eduardo is developing his career as a freelance developer, so he joined Toptal to find intriguing projects where his expertise with JavaScript and React would be impactful.


JavaScript, React, Web Components, Stencil.js, SCSS, HTML, Agile, Scrum, Kanban
React, Redux, SCSS, Git, Storybook, REST
React, HTML, CSS, Less, Redux, Git, Material UI, Firebase




Preferred Environment

Next.js, React, Svelte, Node.js, JavaScript

The most amazing...

...project I've built was a CPU workload monitoring app. It included a small server along with a React-based front end; a sample app can be seen on my website.

Work Experience

Freelance Web Developer

2020 - 2021
  • Tracked and fixed bugs on an existing website using Jira as a reporting tool for my job.
  • Participated in a big merge of different scrum teams acting as a link by transferring information, knowledge, and ways of working between them.
  • Made decisions and advised on code release management and GitFlow processes involving several development teams and big feature releases.
Technologies: JavaScript, React, Web Components, Stencil.js, SCSS, HTML, Agile, Scrum, Kanban

Front-end Lead Architect

2019 - 2020
  • Developed a component library following the provided design system that would serve as the basis for implementing the whole application.
  • Created a clean display of reusable components implemented as part of the base library using Storybook. This showcase would be used by all the other front-end developers within the technical team.
  • Made decisions at an architectural level for the front-end codebase as well as the structure and technologies used in the repository.
Technologies: React, Redux, SCSS, Git, Storybook, REST

Senior Analyst Developer

2017 - 2019
  • Implemented new functionalities for a client's website with thousands of users around Europe.
  • Cleaned up a substantial codebase with a large amount of technical debt and migrated the technology from an outdated stack to React.
  • Took over the implementation process for the front end of an internal application (meant for the client's employees) and redid the UX using a robust component library like Material-UI.
  • Developed a full-stack solution for a social media application (it was Twitter-like) for a client's employees to interact all across the UK.
Technologies: React, HTML, CSS, Less, Redux, Git, Material UI, Firebase

Personal Website | Project Portfolio
During a work break of a few months, I implemented a personal website to promote myself professionally. The original design was taken from the site and the tech stack consisted of HTML, SCSS, and vanilla JavaScript (web components).

Sometime later, I migrated the implementation to SvelteKit ( implement full applications with Svelte. Netlify provides hosting for the site and support for contact form submission:

The site includes a list of small side projects and personal profiles online where my code skills are on display.
2012 - 2016

Bachelor's Degree in Telecommunications

University of Valladolid - Valladolid, Spain


React, REST APIs, Node.js


Git, GreenSock, React Apollo, Stencil.js, Adobe Illustrator


Vanilla JS, Next.js, Svelte, Redux, Material UI


JavaScript, HTML, CSS, HTML5, CSS3, SCSS, TypeScript, GraphQL, Less, Sass


REST, Agile, Scrum, Kanban, Jamstack


Firebase, Netlify, GreenSock Animation Platform (GSAP)


Front-end, SVG, CSS3 Animation, Web Components, Cloud Services, Storybook

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