I am a highly experienced Senior Front End Developer with a proven track record of leading successful UI design and development across industries, from e-commerce to finance. I thrive in both greenfield projects and complex legacy codebases, and I prioritise maintainability, self-documentation, and the delivery of well-tested, performant code that adheres to design standards and accessibility. From my early days developing in WordPress to my current React/TypeScript focus, I have consistently been selected as a representative for the UI discipline within teams due to strong collaboration with stakeholders. I have been extended or rehired in every contract except one, which was by choice.

Tim Sewell

I am a highly experienced Senior Front End Developer with a proven track record of leading successful UI design and development across industries, from e-commerce to finance. I thrive in both greenfield projects and complex legacy codebases, and I prioritise maintainability, self-documentation, and the delivery of well-tested, performant code that adheres to design standards and accessibility. From my early days developing in WordPress to my current React/TypeScript focus, I have consistently been selected as a representative for the UI discipline within teams due to strong collaboration with stakeholders. I have been extended or rehired in every contract except one, which was by choice.

Available to hire

I am a highly experienced Senior Front End Developer with a proven track record of leading successful UI design and development across industries, from e-commerce to finance. I thrive in both greenfield projects and complex legacy codebases, and I prioritise maintainability, self-documentation, and the delivery of well-tested, performant code that adheres to design standards and accessibility.

From my early days developing in WordPress to my current React/TypeScript focus, I have consistently been selected as a representative for the UI discipline within teams due to strong collaboration with stakeholders. I have been extended or rehired in every contract except one, which was by choice.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
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Language

English
Fluent

Work Experience

Front End Developer at Zest Eco
December 1, 2024 - October 28, 2025
Sole UI specialist responsible for delivering three React/TypeScript apps to MVP status, including desktop consoles for Charge Point Operator and Member Service Provider networks and a React PWA for commissioning engineers. Collaborated with Node/AWS backend engineers on APIs, worked with Product Owners and UX, refactored internal design systems and component libraries, and implemented extensive Playwright and unit tests across the Rush-managed monorepo.
Front End Developer at Zest Eco Sole
December 1, 2024 - Present
Sole UI developer for three distinct React/TypeScript applications compliant with EV industry standards (OCPP and OCPI). Developed consoles for desktop use by Charge Point Operator and Member Service Provider organisations and a React PWA for commissioning engineers. Collaborated closely with backend developers on APIs and contributed to design system refactoring. Technologies used include React, TypeScript, PrimeReact, Tailwind, Tanstack Query, Redux, Azure DevOps, and Rush. Also performed a small amount of NetSuite customization.
Front End Developer at Zest Eco Sole
December 1, 2024 - Present
UI developer across three distinct React/Typescript applications compliant with EV industry OCPP and OCPI standards, including consoles for desktop use and a React PWA for commissioning engineers. Collaborated closely with backend developers on API development and contributed to design system refactoring. Utilized React, TypeScript, PrimeReact, Tailwind, Tanstack Query, Redux, Azure DevOps, and Rush with some NetSuite customization.
Front End Developer at Zest Eco Sole
December 1, 2024 - Present
Sole UI developer across three distinct React/TypeScript applications compliant with EV industry OCPP and OCPI standards, providing consoles for desktop use by Charge Point Operator and Member Service Provider organisations and a React PWA for commissioning engineers. Apps consume a Node backend with close collaboration on API development. Contributions to and refactoring of a design system. Technologies used include React, TypeScript, PrimeReact, Tailwind, Tanstack Query, Redux, Azure DevOps, Rush with some NetSuite customisation.
Lead Front End Developer at Morgan Stanley - Firm Resilience
November 30, 2024 - September 3, 2025
Developed UIs for two internal applications; conducted heavy refactoring in the first app to fully utilize React Hooks, improve maintainability, and increase test coverage by modernizing structure and modularity. Led design and development of MVP UI in the second app, successfully bringing the project to production on target. Participated in module federation switch facilitating staggered/ad-hoc releases. Tools and technologies included React, TypeScript, SWR, JIRA, NPM, BitBucket, and Jenkins.
Lead Front End Developer at Morgan Stanley - Firm Resilience
November 30, 2024 - September 3, 2025
Developed UIs for two internal applications. Performed heavy refactoring of the first app to fully utilize React Hooks, improving maintainability and test coverage. Led design and development of MVP UI for the second app and facilitated module federation for staggered releases. Technologies included React, TypeScript, SWR, JIRA, NPM, BitBucket, and Jenkins.
Lead Front End Developer at Morgan Stanley - Firm Resilience
November 30, 2024 - September 3, 2025
Developed UIs for two internal applications. Led heavy refactoring to utilise React Hooks, improving maintainability and test coverage. Led design and development of MVP UI on second app bringing it to production on target. Participated in switch to module federation to facilitate staggered/ad-hoc releases. Used React, TypeScript, SWR, JIRA, NPM, BitBucket, Jenkins.
Lead Front End Developer at Morgan Stanley - Firm Resilience
November 1, 2024 - November 1, 2024
Lead UI developer on a greenfield application to map Key Business Services assets for regulators; delivered MVP UI on target. Refactored associated app to utilize React Hooks, improving maintainability and test coverage, and contributed to a modular release strategy including module federation.
Front End Developer at DataMinr
September 30, 2022 - September 3, 2025
Played major role in refactoring two applications to consume Dataminr AI events stream and integrate into the platform while adding new functionalities and UI elements. Participated in updating the first app codebase to TypeScript and collaborated closely with UX teams implementing Figma designs and contributing to the design system. Utilized React, TypeScript, React-Query, Redux, Styled Components, MapBox, JIRA, BitBucket, PNPM, Jenkins.
Front End Developer at DataMinr
September 30, 2022 - September 3, 2025
Played a major role in refactoring two applications to consume the Dataminr AI events stream and integrate into the Dataminr platform. Updated existing codebase to TypeScript, worked closely with UX for Figma designs, and contributed to the design system. Used React, TypeScript, React-Query, Redux, Styled Components, MapBox, JIRA, BitBucket, PNPM, and Jenkins.
Front End Developer at DataMinr
September 30, 2022 - September 3, 2025
Major role in refactoring two applications to consume the Dataminr AI events stream and integrating it into the overall platform, adding new functionalities and UI elements. Updated existing codebase to TypeScript. Collaborated closely with UX team implementing Figma designs and contributed to the design system. Technologies: React, TypeScript, React-Query, Redux, Styled Components, MapBox, JIRA, BitBucket, PNPM, Jenkins.
Front End Developer at DataMinr
September 1, 2022 - September 1, 2022
Joined following the acquisition of Watchkeeper and Krizo to refactor and integrate two apps into the DataMinr platform. Refactored Watchkeeper from React/JS to React/TS, added functionality including geospatial features via Mapbox, collaborated with UX to implement Figma designs, and contributed to DataMinr's design system and component library.
Front End Developer at Atom Drinks
September 30, 2021 - September 3, 2025
Sole developer of React micro-UIs for feature pages on the Master of Malt e-commerce site, including updating and extending .Net backend API code. Collaborated closely with UX team from initial Figma design to implementation. Technologies used include React, SASS, .Net, JIRA, Octupus, and TeamCity.
Front End Developer at Atom Drinks
September 30, 2021 - September 3, 2025
Solely responsible for development of React micro-UIs for feature pages on Master of Malt e-commerce site, including updating and extending .Net backend API code. Collaborated with UX team implementing Figma designs from scratch. Used React, SASS, .Net, JIRA, Octupus, and TeamCity.
Front End Developer at Atom Drinks
September 30, 2021 - September 3, 2025
Sole developer for React micro-UIs for feature pages on the Master of Malt e-commerce site; also updated and extended .Net backend API code. Worked closely with UX to build Figma designs from the ground up. Technologies: React, SASS, .Net, JIRA, Octupus, TeamCity.
Front End Developer at Atom Drinks
September 1, 2021 - September 1, 2021
Sole responsibility for developing React micro-UIs for feature pages on the Master of Malt e-commerce site, including updating and extending .NET backend API code. Worked closely with UX to implement designs from the ground up.
Front End Developer at Superdrug / AS Watson
August 31, 2020 - September 3, 2025
Conducted Business As Usual (BAU) work on main Hybris-based Superdrug and Savers e-commerce sites using vanilla JavaScript and SASS. Participated heavily in the evaluation and experimentation with front-end frameworks in preparation for migration to Hybris Spartacus. Technologies included Vanilla JavaScript, SASS, JIRA, Bitbucket, Angular, Lit.
Front End Developer at Superdrug / AS Watson
August 31, 2020 - September 3, 2025
Performed BAU work on main Hybris-based Superdrug and Savers e-commerce sites using vanilla JavaScript and SASS. Played a major role in evaluation and experimentation with front-end frameworks ahead of planned move to Hybris Spartacus technology. Technologies included Vanilla JavaScript, SASS, JIRA, Bitbucket, Angular, and Lit.
Front End Developer at Superdrug / AS Watson
August 31, 2020 - September 3, 2025
BAU work using vanilla JavaScript and SASS on Hybris-based Superdrug and Savers e-commerce sites. Played major role in evaluating FE frameworks ahead of move to Hybris Spartacus. Technologies: Vanilla JavaScript, SASS, JIRA, Bitbucket, Angular, Lit.
Front End Developer at Superdrug / AS Watson
August 1, 2020 - August 1, 2020
BAU work using vanilla JavaScript and SASS on Hybris-based Superdrug and Savers e-commerce sites; led evaluation and experimentation with FE frameworks in preparation for the Hybris Spartacus migration.
Lead Front End Developer at Wundermann Thompson
September 30, 2019 - September 3, 2025
Led development of a React mobile progressive web app (PWA) for delivery drivers, reverse-engineered from a legacy Angular/Cordova native app. Utilized React Context and Hooks, Heroku, ApiGee, SASS, JIRA and AWS SDK (S3).
Lead Front End Developer at Wundermann Thompson
September 30, 2019 - September 3, 2025
Led development of React mobile PWA for delivery drivers, reverse-engineered from a legacy Angular/Cordova native app. Used React, React Context, React hooks, Heroku, ApiGee, SASS, JIRA, and AWS SDK (S3).
Lead Front End Developer at Wundermann Thompson
September 30, 2019 - September 3, 2025
Led development of React mobile PWA for delivery drivers reverse-engineered from legacy Angular/Cordova app. Technologies: React, React Context, React Hooks, Heroku, ApiGee, SASS, JIRA, AWS SDK (S3).
Lead Front End Developer at Wundermann Thompson
September 1, 2019 - September 1, 2019
Led development of a React mobile PWA for delivery drivers, reverse-engineered from a legacy Angular/Cordova native app.
Front End Developer at Superdrug / AS Watson
June 30, 2019 - September 3, 2025
Business As Usual work on main Hybris-based Superdrug and Savers Hybris SAP e-commerce sites using vanilla JavaScript and SASS. Tools included JIRA and Bitbucket.
Front End Developer at Superdrug / AS Watson
June 30, 2019 - September 3, 2025
BAU work on main Hybris-based Superdrug and Savers e-commerce sites using vanilla JavaScript and SASS.
Front End Developer at Superdrug / AS Watson
June 30, 2019 - September 3, 2025
BAU work using vanilla JavaScript and SASS on Hybris SAP e-commerce sites for Superdrug and Savers. Technologies: Vanilla JavaScript, SASS, JIRA, Bitbucket.
Front End Developer at Superdrug / AS Watson
June 1, 2019 - June 1, 2019
BAU work using vanilla JavaScript with SASS on Hybris SAP e-commerce sites; continued involvement in FE innovations and framework evaluation.
Senior Front End Developer at TAG Worldwide
September 30, 2018 - September 3, 2025
Contributed to and later led UI development of a significant SaaS digital asset/project management single-page application (SPA) serving over 200,000 daily users in global blue-chip corporations. Technologies included Backbone, ES6, jQuery, Grunt, Gulp, NodeJS, Express, LESS, Selenium, and Mocha.
Senior Front End Developer at TAG Worldwide
September 30, 2018 - September 3, 2025
Participated in and later led UI development of a significant SaaS digital asset/project management SPA serving 200,000+ daily users in global blue-chip corporates. Technologies used: Backbone, ES6, jQuery, Grunt, Gulp, NodeJS, Express, LESS, Selenium, Mocha.
Senior Front End Developer at TAG Worldwide
September 30, 2018 - September 3, 2025
Participated and later led UI development of a significant SaaS digital asset/project management SPA serving 200,000+ daily users in global blue-chip corporates. Technologies: Backbone, ES6, jQuery, Grunt, Gulp, NodeJS, Express, LESS, Selenium, Mocha.
Senior Front End Developer at TAG Worldwide
September 1, 2018 - September 1, 2018
Participated in and later led UI development of a significant SaaS digital asset/project management SPA serving 200,000+ daily users in global blue-chip corporates; legacy stack included Backbone, ES6, jQuery, Grunt/Gulp, NodeJS, Express, and LESS.
Full Stack Developer at Estee Lauder Companies
October 31, 2013 - September 3, 2025
Created an iPad Mini SPA POS system for in-store consultants in MAC cosmetics stores and led refactoring of an internal recruitment-tracking application. Used Zend, BackboneJS, jQuery, Apache SOLR.
Full Stack Developer at Estee Lauder Companies
October 31, 2013 - September 3, 2025
Created iPad Mini SPA POS system for in-store consultants in MAC cosmetics stores and led refactoring of internal recruitment-tracking application. Used Zend, BackboneJS, jQuery, Apache SOLR.
Full Stack Developer at Estee Lauder Companies
October 31, 2013 - September 3, 2025
Created iPad Mini SPA POS system for in-store MAC cosmetics consultants and led refactoring of internal recruitment tracking application. Technologies: Zend, BackboneJS, jQuery, Apache SOLR.
Full Stack Developer at Estee Lauder Companies
October 1, 2013 - October 1, 2013
Created iPad Mini SPA POS system for MAC cosmetics in-store consultants; led refactoring of internal recruitment-tracking application.
Full Stack Developer at SceneStealer/Ceemore
June 30, 2013 - September 3, 2025
Led design and development of a system for creating JavaScript advertising capsules with an extensive tracking and analysis subsystem. Technologies included CodeIgniter, JavaScript, CSS, jQuery, MySQL.
Full Stack Developer at SceneStealer/Ceemore
June 30, 2013 - September 3, 2025
Led design and development of system for creation of JavaScript advertising capsules with extensive tracking and analysis subsystem. Technologies included CodeIgniter, JavaScript, CSS, jQuery, MySql.
Full Stack Developer at SceneStealer/Ceemore
June 30, 2013 - September 3, 2025
Led design and development of system for creating JavaScript advertising capsules with extensive tracking and analysis sub-system. Technologies: CodeIgniter, JavaScript, CSS, jQuery, MySQL.
Full Stack Developer at SceneStealer/Ceemore
June 1, 2013 - June 1, 2013
Led design and development of a system for creating JavaScript advertising capsules with extensive tracking and analysis sub-system.
Full Stack Developer at Public-i
October 31, 2012 - September 3, 2025
Designed and developed a white-label streaming/captioning application mainly used by local authorities for web broadcasting of meetings. Technologies included CodeIgniter, JavaScript, CSS, jQuery, Apache, MySQL, AWS SDK (S3, ECS).
Full Stack Developer at Public-i
October 31, 2012 - September 3, 2025
Designed and developed white-label streaming/captioning application used mainly by local authorities for web broadcast of meetings. Used CodeIgniter, JavaScript, CSS, jQuery, Apache, MySql, AWS SDK (S3, ECS).
Full Stack Developer at Public-i
October 31, 2012 - September 3, 2025
Designed and developed white-label streaming/captioning application mainly used by local authorities for web broadcast of meetings. Technologies: CodeIgniter, JavaScript, CSS, jQuery, Apache, MySQL, AWS SDK (S3, ECS).
Full Stack Developer at Public-i
October 1, 2012 - October 1, 2012
Designed and developed a white-label streaming/captioning application primarily used by local authorities for web broadcasts of meetings.

Education

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Qualifications

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Industry Experience

Financial Services, Computers & Electronics, Retail, Software & Internet, Media & Entertainment, Energy & Utilities, Consumer Goods, Transportation & Logistics, Professional Services, Other

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
See more