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Mikael Guillin
Actively searching
Application developer
New York
Fixed term, Freelance, Permanent contract
100% Remote work
Technologies
About
Mikael Guillin
Senior Software Engineer | React | Vue | TypeScript | 12+ years experience
Application developerNew York
developer avatar
Description

Software engineer with over 12 years of professional experience delivering web solutions across various industries including B2B event management, insurance, and different types of structure such as startups, web agencies and international organizations.
With a focus on web performance and accessibility, I aim to create optimized user interfaces and contribute to the success of web development projects.

Professional experiences
12 years of experience as Application developer (or similar)
Senior Software Engineer
United Nations Office on Drugs and Crime - ViennaJun 2024 - Feb 2025 · 8 months

• Successfully migrated a drug monitoring platform from Vue 2 to Vue 3 utilizing the Composition API.

• Transitioned from Webpack to Vite.js which dramatically shortened build times.

• Implemented TypeScript and set up unit tests with Vitest and Vue Test Utils.

• Automated TypeScript types generation from backend models, reducing manual work.

• Optimized, refactored components for maintainability and performance.

• Refactored authentication by implementing Microsoft Authentication Library (MSAL) as a Vue composable.

• Contributed to adding Rest API endpoints with FastAPI.

Software Engineer
Inwink - ParisJan 2022 - Apr 2023 · 1 year 3 months

• Implemented React, TypeScript, Redux, and .NET framework to develop key features such as post feed, forum, sub-community, partner workspace for Community, a product used by VivaTech (Europe's biggest tech event).

• Designed and built an event invitation system, enabling managers to send event tickets and track participation.

• Reduced Event platform tickets by 80% by resolving legacy bugs, improving customer satisfaction.

• Used WordPress and Page Builder plugin to boot Inwink’s website, allowing the marketing team to edit content in a simple manner.

• Leveraged Playwright for end-to-end testing to enhance product reliability.

• Utilized Flutter framework to contribute to VivaTech’s mobile application aimed to guide users during events.

Software Engineer
Infinite Square - ParisSep 2019 - Dec 2021 · 2 years 3 months

• Worked with React, Angular, TypeScript, Redux, NgRx, and Jest to architect and develop business applications for customers including French national companies such as EDF Energy and SNCF.

• Developed a gamified HR application using React and Material UI aimed to improve employee career development.

• Built a food supply management platform using Bootstrap and jQuery, helping companies achieve zero waste.

• Used WordPress, Twig, and ACF plugin to redesign Women’s Forum website, wrote user guides and trained the customer to use the back-office.

• Led knowledge-sharing sessions, conducting presentations on best practices and lessons learned.

• Worked with Azure DevOps in an agile environment including user stories, daily meetings, retrospective
meetings, client demonstrations, code reviews.

Frontend Engineer
LeLynx.fr - ParisMar 2017 - Sep 2019 · 2 years 6 months

• Worked with WordPress, Twig, Sass, ES6 to redesign France's leading insurance comparison website generating thousands of daily visits.

• Transitionned from Gulp to Webpack to build and process frontend assets, analyze code syntax and automatically eliminate unused code with the tree shaking feature.

• Implemented lazy-loading, critical CSS, assets minification, WP-Rocket plugin and used analysis tools such as Google PageSpeed and Dareboost to maintain high performances.

• Built a design system to ensure seamless UI/UX consistency across comparison applications.

• Led a team as a Product Owner for the health insurance comparator focused on enhancing user experience to increase comparisons and business income.

• Used Angular to develop a new energy supplier comparator, contributing to LeLynx's business growth.

• Deployed to India for two international assignments to collaborate with the local team and share best practices.

Frontend Engineer
Actualys - Neuilly-sur-SeineNov 2012 - Feb 2017 · 4 years 3 months

• Developed Drupal websites for key account clients such as UNESCO, Monnaie de Paris, Berluti, Carrefour, ensuring web accessibility, standards compliance, and Internet Explorer 7 support.

• Used Gulp to automate tasks such as compilation, minification, archiving, browser testing.

• Worked with jQuery to develop complex user interfaces for open-source business applications for the wine industry.

• Trained and supervised trainees, fostering a strong development team.

Schools
5 years of higher education
Baruch College
Master's Degree2026
Technologies
Skills
Interested by...Rust
Languages
  • French
  • English
Tests
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