Julien JEAN
Fullstack TypeScript Developer
B2B SaaS applications, from front end to microservices, application security
Experience
- Sept. 2025 - present
Sept. 2025 - present Fullstack TypeScript Developer, Architecture & Security
- B2B SaaS architecture: Vue 3 / Nuxt 4 / Next.js front end, NestJS back end, microservices over RabbitMQ and Redis.
- Integration of an LLM (Mistral) for document extraction and classification, GDPR compliant.
- Publication of reusable, maintainable TypeScript npm libraries (service-to-service authentication, semantic versioning, conventional commits), unit tested.
- Security & isolation: HMAC between microservices, Bearer JWT and SSO for users, ACL.
- Infrastructure: setup and administration of Debian VPS servers (hardening); Docker, continuous deployment with GitLab CI/CD.
- June 2025 - July 2025
June 2025 - July 2025 Vue.js Front-end Developer
- Rebuild of Flying Hub (Vue 3.5): migration from the Options API to the Composition API + TypeScript, centralised state with Pinia.
- Vitest tests, Axios API layer (authentication, CSRF), OWASP / ANSSI compliance.
- 2024 - 2025
2024 - 2025 Personal projects & skills development
- Personal web projects in TypeScript (Vue / Nuxt front end, NestJS back end).
- Specialisation in back end, microservices and application security.
- April 2022 - February 2024
April 2022 - February 2024 JavaScript / TypeScript Front-end Developer
- Design and development of Young Learner (Vue 3 + TypeScript) with integration tests.
- Migration of 3 Vue 2 / 3 applications to Nuxt 3; collaboration with the NestJS back end, AWS deployment.
- Oct. 2021 - Dec. 2021
Oct. 2021 - Dec. 2021 Fullstack JavaScript Developer
- Design of an administration and moderation dashboard (Vue + Express API), fine-grained role management through ACL.
- Responsive, secure interface for a community platform.
Skills
Languages
TypeScript
JavaScript
Node.js
Front-end
Vue 3 / Nuxt 4
React / Next.js
Tailwind v4
Back-end & API
NestJS
Express
RabbitMQ
LLM (Mistral)
Security
HMAC
Bearer JWT
SSO
ACL
Data & DevOps
PostgreSQL / MariaDB
MongoDB
GitLab CI/CD
Docker
Debian Linux
Bash