Freelancer profile translated to English.

Description

NestJS / TypeScript backend developer with 4 years of experience in a demanding multi-client environment, I design APIs and integration architectures built to last in production.

For 4 years, I have been integrating and maintaining NestJS APIs for e-commerce, retail, and restaurant clients on an iPaaS platform — up to 45 active accounts in parallel, each with its own third-party systems to connect (ERP, POS, logistics, pricing).

Technically, my daily playground: NestJS REST API, queues, databases, Elasticsearch search, Kubernetes deployments on GCP, GitLab CI/CD. I work on new projects as well as existing codebases to stabilize or evolve them.

I primarily work with product teams or IT departments that need a solid backend to interconnect third-party systems without having to hire a full-time senior profile.

My approach: the first week is dedicated to understanding the context and the existing system before writing any code. Incremental and documented deliveries. Available remotely, with a response time of < 4 hours during the day.

Industry field of expertise

Languages

French
Native or bilingual
English
Conversational

Workplace preferences

Remote only

Primarily works remotely

Apizr
CI/CD & E2E Tests Playwright — Quality Automation
January 2025 - Today (1 year and 6 months)
Lille, France
Implementation of the Playwright E2E testing strategy integrated into the GitLab CI/CD pipeline for the Ecosystem front-end. Testomat.io integration (Mixed Run). Automated tests covering critical multi-client workflows.
Playwright Automated Tests end-to-end tests Gitlab CI/CD E2E Tests
Apizr
NestJS Backend Developer – Integrations & APIs
June 2022 - Today (4 years and 1 month)
Lille, France
Development and maintenance of NestJS / TypeScript APIs on a multi-tenant iPaaS platform. Integration of third-party systems (ERP, e-commerce) for 45+ clients.
NestJs Typescript Node.js REST API Elasticsearch
Apizr
Kubernetes Infrastructure Migration — vSphere / Tanzu
April 2022 - April 2023 (1 year)
Lille, France
On-prem Windows migration → vSphere/Tanzu Kubernetes cluster post-security incident. Dockerization and deployment of 12 heterogeneous services: Gravitee APIM, MongoDB, RabbitMQ, NestJS, Elasticsearch. Full GitLab CI/CD pipeline with staging and production.
Kubernetes Docker Gitlab CI/CD Microservices Software Architecture

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Full Stack Web Developer
O'Clock
Formation intensive full stack de 6 mois — JavaScript, Node.js, React, bases de données SQL/NoSQL, API REST, méthodes agiles. Reconversion depuis 5 ans de dessin technique ferroviaire (Catia V5) — apprentissage de zéro, en accéléré, en production immédiate.
Continuing education — Backend Specialization
Self-Taught · @LeDevNovice
2026
NestJS avancé, TypeScript strict, architecture microservices, Kubernetes/GCP, Elasticsearch, tests E2E Playwright. Apprentissage documenté publiquement depuis 2021 sous @LeDevNovice (~8 500 abonnés) — chaque concept maîtrisé est partagé, expliqué, débattu.

Grégory Saison

NestJS / TypeScript Developer – Integrations

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