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Miami · New York · Remote

Available for senior frontend roles

Marc Mathieu · Senior Frontend Engineer

Complex products,carefully made.

I lead frontend work from early product decisions through production, shaping both the experience and the system behind it.

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Selected work · 01 / 03

Selected frontend work.

Three case studies about the product decisions and frontend delivery behind AG1, Battlefield 2042, and BeautyNexos.

01AG1Frontend lead through Code Particle2023–202502BattlefieldFrontend engineer through Code Particle2020–202103BeautyNexosSenior engineer through Code Particle2025–2026

01AG1

012023–2025Frontend lead through Code Particle

Subscription commerce · Six international markets

AG1

I built the UI and APIs for AG1's subscription service, using Shopify selling plans to power Shop AG1 and the cart. I also helped lead frontend decoupling.

AG1 homepage hero introducing AG1 Pro beside a green travel pack and shaker
Public AG1 homepage, captured August 2026. The live site has continued to change since my 2023–2025 work.
Focus
Global subscription commerce
Ownership
Subscription UI and APIs, Shop AG1, and cart
Stack
React, Next.js, Shopify
View full case studyClose case studyAG1

Full case study

Building AG1's subscription service across UI, APIs, and Shopify.

The product problem

Shopify provided subscription primitives, but not the complete product AG1 needed. The service had to handle product and cadence selection, carry those choices through the cart, and translate them into Shopify selling plans.

My role

I worked across product, design, and engineering to deliver the subscription UI and APIs, Shop AG1, the cart, and the supporting Shopify integration.

AG1 · public behavior map
  1. 01Choose product
  2. 02Choose cadence
  3. 03Resolve market rules
  4. 04Review subscription cart

Selected contributions

What I owned and shipped

  1. 01

    Built the subscription UI and APIs connecting product and cadence choices to Shopify selling plans.

  2. 02

    Implemented Shop AG1 and the full cart experience for subscription and one-time purchases.

  3. 03

    Helped lead frontend decoupling and worked with design on shared interface decisions.

  4. 04

    Shipped product-change flows, Monta pickup-point support, and localized experiences across six international markets.

Public evidence

The product in public.

Current AG1 Pro product page with monthly and three-month delivery options
Public AG1 Pro purchase flow, captured August 2026. The live storefront has changed since my 2023–2025 work.

Outcome

The work powered AG1's subscription shopping journey and supported six international markets.

ReactNext.jsTypeScriptShopifyStatsigRudderStackLaunchDarkly

02Battlefield

022020–2021Frontend engineer through Code Particle

Experience creation · Eighteen-month engagement

Battlefield

I helped build Battlefield 2042's web-based Portal Builder, turning dense game configuration into tools players could use.

Battlefield 2042 homepage hero showing a squad moving through an urban battle
Public Battlefield 2042 homepage, captured August 2026. My work focused on the web-based Portal Builder.
Focus
Battlefield Portal Builder
Ownership
Weapons, equipment, and Experience configuration
Stack
Vue, Observables, CSS Modules
View full case studyClose case studyBattlefield

Full case study

Making custom Battlefield experiences easier to configure.

The product problem

The Builder had to make a dense set of game options understandable while showing players how each choice affected the others.

My role

I owned key Portal Builder configuration tools and contributed to its design system.

Battlefield · public behavior map
  1. 01Define mode
  2. 02Select weapons
  3. 03Select equipment
  4. 04Review Experience

Selected contributions

What I owned and shipped

  1. 01

    Built the weapon and equipment selectors, including the states used to include, exclude, and review available content.

  2. 02

    Implemented the custom Experience configuration interface.

  3. 03

    Contributed reusable UI patterns to the Portal Builder design system.

Public evidence

The product in public.

Official Battlefield Portal Builder interface for choosing available weapons
Weapon selection in the public EA Portal briefing. Official Electronic Arts image, published 2021.
Official Battlefield Portal Builder interface for choosing available equipment
Equipment selection in the public EA Portal briefing. Official Electronic Arts image, published 2021.

Outcome

The configuration tools shipped with Battlefield 2042's Portal Builder and remain documented in EA's public launch material.

VueObservablesCSS ModulesDesign systems

03BeautyNexos

032025–2026Senior engineer through Code Particle

Cross-platform product · Flutter and TypeScript

BeautyNexos

I led cross-platform work on Trade Calendar, payments, and member tools across BeautyNexos's Flutter app and Strapi platform.

BeautyNexos homepage with two editorial stories about beauty innovation
Public BeautyNexos homepage, captured August 2026. My work also includes member and platform areas beyond this public view.
Focus
Cross-platform member platform
Ownership
Calendar, payments, products, and galleries
Stack
Flutter, Strapi, Stripe
View full case studyClose case studyBeautyNexos

Full case study

Building a member product across Flutter, Strapi, and Stripe.

The product problem

BeautyNexos needed one member experience across events, content, and payments.

My role

I led Trade Calendar, payments, and member tools from interface through cross-platform integration.

BeautyNexos · public behavior map
  1. 01Ingest event data
  2. 02Normalize dates
  3. 03Apply filters
  4. 04Present across platforms

Selected contributions

What I owned and shipped

  1. 01

    Built Trade Calendar browsing and filtering across dates, locations, categories, regions, and topics.

  2. 02

    Built product and gallery tools and implemented Stripe payment flows across Flutter and Strapi.

  3. 03

    Delivered responsive homepage and member-dashboard experiences in Flutter.

Public evidence

The product in public.

BeautyNexos Trade Calendar with event filters and a featured event
Public BeautyNexos Trade Calendar, captured August 2026. Private member-management screens are intentionally excluded.

Outcome

Members gained clearer ways to discover events and manage their content and payments.

FlutterStrapiTypeScriptStripeTesting

Experience · 2014 / 2026

Twelve years building frontend products.

2018–2026

Senior Software Engineer

Code Particle

Led frontend delivery for client products across commerce, subscriptions, game tools, security, and financial software.

  • React
  • Next.js
  • TypeScript
  • Vue
  • Flutter
  • Node.js

2015–2018

Lead Software Engineer

SonicLoop Networks

Built responsive products and Node.js services while leading four junior developers.

  • JavaScript
  • Node.js
  • NoSQL
  • Angular

2014–2015

Software Engineer

Spatially

Built frontend experiences for aboutPLACE and other products while serving as Scrum Master.

  • JavaScript
  • Responsive UI
  • Product delivery

About Marc

Good frontend work should make sense to the people using it and the people maintaining it.

I'm a Miami-based senior frontend engineer with more than a decade of experience building consumer and enterprise products. I lead frontend work across disciplines while staying hands-on in the code.

In practice, that means getting the behavior right for users and leaving the frontend clear enough for the next engineer to change. I'm especially interested in how AI is changing both the way we build software and the interfaces we build around it.

Open to senior frontend roles

Need help building something?

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Miami-based · Remote US · Miami or New York hybrid

© 2026 Marc Mathieu