Guillaume Pierson - Senior Full Stack Developer

Summary

Full Stack Developer with 7+ years of experience crafting robust, scalable web applications. Adept at transforming vague concepts into functional products, with a strong focus on code quality, performance, and team collaboration. Recognized for technical expertise and pragmatic problem-solving, with a proven track record of optimizing performance and developer experience. Looking to contribute to a product-focused company with long-term impact.

Experience

Marmelab – Full Stack Developer

February 2022 – Present

Built a performant search engine indexing millions of records (Coutot-Roehrig), with response times under 200ms for simple and <750ms for complex queries.
Designed a graph visualization tool to explore genealogical data for internal users.
Developed a web chatbot using OpenAI's API to automate form-filling workflows.
Refactored e2e testing for Mitsubishi, reducing key test durations from 7 minutes to 30 seconds.
Known internally for deep technical expertise and mentoring peers.
Contributor to hackdays and blog author on AI, frontend and tooling topics.

Versumind – Full Stack Developer

September 2017 – February 2022

Delivered backend and frontend features across client projects.
Built shared authentication and deployment modules for microservices.
Created reusable Angular components for high-performance UIs.
Maintained APIs and data flows with Java, Spring Boot, RabbitMQ.

Education

Master's Degree – Computer Science (MIAGE)

Université de Lorraine, Nancy – 2017

Specialization: Distributed Information Systems

Technical Degree – Computer Science (DUT)

IUT Nancy-Charlemagne – 2014

Technical Skills

Full Stack Development

TypeScript & React

Backend Architecture

Performance Optimization

Languages

TypeScript JavaScript Java SQL

Frontend Technologies

React Remix Angular React-Admin Tailwind CSS HTML5 CSS3

Backend Technologies

Node.js NestJS Spring Boot PostgreSQL RabbitMQ REST APIs

DevOps & Tools

Docker Kubernetes NGINX Git DNS Cypress Playwright

Concepts & Methodologies

TDD Agile Microservices CI/CD LLM prompt engineering OpenAI API

Involvement

Founder & Tech Lead – MIAGE Junior Informatique Nancy (JIN)

Set up and maintained infrastructure for a junior enterprise. Managed deployments and toolchains.