Hi, my name is

Delphine Poupon.

I design and build modern web experiences.

Senior Frontend Engineer with 8+ years of experience building scalable web applications and design systems. Specialized in React, Next.js, and TypeScript, with a strong focus on performance, maintainability, and user experience. Experienced in leading frontend architecture while contributing across the full stack to deliver high-quality products from concept to production.

Check out my projects!

About Me

I'm a Senior Frontend Engineer with over 8 years of experience building modern, scalable, and user-focused web applications.

My expertise lies in React, TypeScript, Next.js, and design systems, helping teams turn complex ideas into clean, high-performance interfaces. I enjoy working at the intersection of design and engineering, where great user experience meets robust, maintainable code.

Throughout my career, I've worked in both startup and product environments, taking ownership of frontend architecture, improving performance, and building scalable design systems from the ground up. While my primary expertise lies in frontend engineering, I've also contributed across the full stack by designing APIs, structuring application architecture, and delivering end-to-end features when projects required it. I'm comfortable working closely with product teams, with or without dedicated designers, turning ideas into intuitive, polished, and production-ready experiences.

In addition to frontend expertise, I also help clients bring projects to life end-to-end. For simpler needs like landing pages, MVPs, or small web applications, I handle everything from interface design to development and deployment, allowing clients to move fast without compromising on quality.

I care deeply about building products that are not only functional, but also clear, intuitive, and scalable over time.

Here are a few things I care about when building products:

  • ▹Building scalable and maintainable frontend architectures
  • ▹Crafting intuitive experiences that balance user needs and business goals
  • ▹Designing design systems that improve consistency and developer efficiency
  • ▹Delivering production-ready products with a focus on quality and performance
  • ▹Bridging product, design, frontend, and backend to deliver cohesive solutions

Experience

A snapshot of where I've been working recently.

Freelance Full-Stack Developer @ Independent / Freelance

Present

I design and deliver custom web applications from concept to deployment.

Key projects

  • BeEco (custom game server & modding platform)
  • Pokopia Companion (web app & interactive tools)
  • Consulting and custom web applications for clients

Achievements

  • Designed and built a custom Eco server, developing gameplay mods, backend systems, and automation tools to support a live multiplayer environment
  • Built a full-stack web application (Pokopia Companion), including data architecture, API design, and interactive tools such as a map planner
  • Provided UX guidance and design system support to improve product consistency and usability.
  • Designed and delivered custom web applications from concept to deployment.
ReactTypeScriptNext.jsTailwind CSSNode.jsC#UnityGraphQL

Lead Frontend Engineer @ Hyperspread

03.2022 - 01.2025

Led frontend development for a marketing SaaS platform, focusing on scalability, performance, and product quality.

Key projects

  • Led frontend development for a SaaS platform connecting brands and local points of sale.
  • Defined frontend architecture and engineering standards.
  • Managed and mentored developers while coordinating technical initiatives.

Achievements

  • Led a large-scale TypeScript migration and React ecosystem upgrades.
  • Designed and implemented a shared design system to improve consistency and development velocity.
  • Built and maintained the React Native mobile application.
React.jsTypeScriptNext.jsTailwind CSSReact NativeExpoGraphQLNode.js

Lead Frontend Engineer @ canB

03.2021 — 02.2022

Canb is an impact neobank committed to supporting ethical actions. The canB bank card brings rewards to give back to partner associations.

Key projects

  • Rebuilt and maintained core banking features for the canB card and donations platform.
  • Designed and maintained internal tools used by the engineering and operations teams.

Achievements

  • Reinternalized external code and restructured the environment used by the team through different tools.
  • Implemented authentication with 3D Secure v2 for secure online payments inside the canB application.
Flutter

Frontend Developer @ Freelance

08.2020 - 03.2021

Designed and developed a complete digital platform from concept to production for an independent newspaper, delivering a modern and scalable user experience.

Key projects

  • Deliver a fully functional, production-ready product

Achievements

  • Designed and implemented a responsive, user-focused interface optimized for desktop and mobile devices
  • Established a modern frontend architecture using Next.js and TypeScript
  • Ensured maintainability and scalability through reusable components and clean code practices
React.jsNext.jsTypeScriptCSS-in-JS

Frontend Developer & UI/UX Designer @ FacilitaTrip

04.2018 - 09.2020

FacilitaTrip is a platform designed to simplify the creation and management of tailor-made travel experiences for travel agencies and tour operators.

Key projects

  • Centralizes itinerary planning and service bookings into a single platform, allowing agencies to efficiently build and manage complex trips.
  • Provides a comprehensive suite of tools for travel agencies, including itinerary planning, service bookings, and customer management.

Achievements

  • Developed a real-time route visualization system using Google Maps, dynamically updating itineraries based on Rome2Rio data when modifying trip steps
  • Designed and integrated multiple product features and UI flows, improving usability and overall platform experience
  • Built a channel manager to centralize product data, reservations, and operational workflows
React.jsReduxGoogle Maps API

Some Things I've Built

BeEco

BeEco is a custom Eco server where I develop mods and technical systems to extend the game's functionality and improve player experience.

I work on gameplay logic, server-side features, and automation tooling, including Discord bots, data tracking systems, and server management workflows. This project allowed me to combine game modding, backend development, and system design in a real-world environment with active users.

ReactTypeScriptNode.jsC#Unity

Pokopia Companion

Pokopia Companion is a web application I designed and built to enhance the player experience around the game Pokopia.

It combines structured game data (items, habitats, etc.) with interactive tools such as a map planner, allowing players to organize, explore, and plan their creations. The project focuses on performance, scalability, and a clean user experience, with a strong emphasis on data architecture and usability.

ReactNode.jsNext.jsTailwind CSSTypeScript

OniDream

OniDream is a sleep-tech project combining hardware and mobile application to improve sleep quality and enable lucid dreaming.

I contributed to research, prototyping, and mobile development, building an initial system using sensors and a connected mask to analyze sleep cycles. The project explored how to collect, process, and use sleep data to trigger stimuli (light and audio) during specific sleep phases, while also shaping the product direction and user experience.

Java

What's Next?

Get In Touch

I'm currently looking for new opportunities, my inbox is always open. Whether you have a question or just want to say hi, I'll try my best to get back to you!

Say Hello