David Hérault, Developer in Paris, France
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David Hérault

Verified Expert  in Engineering

Full-stack Developer

Paris, France
Toptal Member Since
April 27, 2020

David is a full-stack developer with a decade of professional experience. His work for the open-source community earned recognition for front-end development and serverless DevOps. David is detail-oriented, values simplicity and efficiency, and uses cutting-edge technologies while maintaining proper code quality.


SAS ManaSoft
React, Next.js, Material UI, Symphony, Twig, PHP
Plural Labs, Inc
React, GraphQL, Git
React, Material UI, Tailwind CSS, Next.js




Preferred Environment

Amazon Web Services (AWS), Slack, Git, Serverless, React, Node.js, CSS, DevOps

The most amazing...

...app I've developed is an AI-powered strategic consulting app for CEOs. It relies on a semantic knowledge graph of enterprise data and a deep neural network.

Work Experience

React Expert | Next.js Developer

2023 - 2023
SAS ManaSoft
  • Made architectural decisions about the front-end. Collaborated closely with the CTO for this.
  • Helped two junior coworkers with their code as a senior.
  • Created many custom React components for the specificity of the platform.
Technologies: React, Next.js, Material UI, Symphony, Twig, PHP

Full-stack Developer

2022 - 2022
Plural Labs, Inc
  • Built a front-end framework for the specificity of our platform. Launched it as an open-source package.
  • Conducted architectural decisions for the front-end.
  • Worked closely with the design team, implementing a full design system with the front-end team.
Technologies: React, GraphQL, Git

Front-end Engineer

2021 - 2021
  • Developed an application to manage childcare programs and seats. Had to create many components and refactored a few.
  • Enhanced a dedicated component library deployed on npm teams.
  • Worked with complex SQL queries in a new MVP pattern.
Technologies: React, Material UI, Tailwind CSS, Next.js

Front-end Engineer

2020 - 2020
KF Software Solutions, Inc. (via Toptal)
  • Developed an application for the worldwide lumber industry, using cutting-edge technologies.
  • Handled a large amount of data between the client and server, using a caching system to query only relevant data.
  • Used the React Material-UI library to create a unique and inspired interface.
  • Refactored the existing application, deleting thousands of lines in a cleanup state of mind.
  • Generated PDFs for invoices and other documents on the browser.
Technologies: Front-end, Full-stack, Adobe, Material UI, Redux, React

Full-stack Engineer

2018 - 2020
  • Developed an application for civil servants and students to demonstrate their computer skills by answering a series of increasingly difficult questions about information technologies.
  • Rewrote the question-asking engine to use cutting-edge technologies.
  • Wrote the application, which was well-received and highly effective, using Node.js and Ember.js.
  • Implemented complex components with CSS transitions and animations.
Technologies: Full-stack, Ember.js, Node.js, JavaScript

Knowledge Engineer

2015 - 2017
  • Developed an architecture for importing, processing, and outputting semantic data through a deep neural network.
  • Implemented a simple and user-friendly interface for CEOs—busy people with very little time to spend on an application.
  • Oversaw the launch process from a product owner's point of view.
  • Recruited great engineers and business managers to build a talented team.
Technologies: Full-stack, TensorFlow, Node.js, React, JavaScript, HTML, APIs


A serverless plugin that emulates AWS API Gateway and Lambda locally. I wrote it in 2016 and have maintained it ever since with more than 180 collaborators. In 2020, It reached a total of 3,500 stars and 250,000 downloads per week and continues to increase. It's the top serverless plugin in terms of users, downloads, and activity.

Personal Website

I built this website to display my skills in vanilla JavaScript, along with a few pieces of my artwork. The site is the hardest app I've developed in terms of code complexity. It includes famous mathematical wonders such as fractals, polyhedrons, and Fourier series.

Pix: French Ministry of Education

An application to test and assert civil servants' and students' information technology skills. As a full-stack developer, I was part of the second wave of developers and enjoyed every bit of developing the app.

Gourmet: eat, review, love

A web application to explore and review restaurants. Any user can register one or more restaurants. Restaurants can then be reviewed by users, and owners can reply. Restaurant owners can access the restaurant's dashboard to read meaningful information about the reviews and analytics for their restaurant. Administrators can update and delete any data on the app.
2014 - 2016

MBA in Business Administration

Sorbonne Graduate Business School (IAE Paris) - Paris, France

2012 - 2015

Master of Science Degree in Mechanical and Industrial Engineering

Arts et Métiers ParisTech - Paris, France

2013 - 2014

Master of Science Degree in Design and Innovation Management

Lund University - Lund, Sweden


Greedy Algorithms, Minimum Spanning Trees, and Dynamic Programming



Graph Search, Shortest Paths, and Data Structures



Divide and Conquer, Sorting and Searching, and Randomized Algorithms



Machine Learning



React, Node.js, TensorFlow


Git, Slack, Adobe


Serverless Framework, Relay, React Native, Redux, Material UI, Unity3D, Unity, Tailwind CSS, Next.js, Electron, Ember.js, Twig


GraphQL, JavaScript, HTML, CSS, C#, TypeScript, Solidity, PHP


Serverless Architecture, DevOps


Amazon Web Services (AWS), AWS Lambda, Blockchain


Google Cloud


Amazon API Gateway, Serverless, Algorithms, Full-stack, Front-end, Back-end, Data Visualization, APIs, Extended Reality (XR), VR Platform, Cryptocurrency, Mechanical Engineering, Industrial Engineering, Design, Innovation Management, Symphony

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