Julien Hairapian
Senior Fullstack Engineer | Node.js | React
Salary / Daily rate
91400 Orsay, France
Freelance
Can come onsite
Skills
Languages
About me
Intro
Senior fullstack developer with extensive experience in TypeScript, Node.js, and React, specializing in clean architecture and scalable solutions. Led multiple high-impact projects including a BNPL payment platform and government energy transition systems. Passionate about knowledge sharing and team leadership, delivering robust solutions with modern tech stacks and DevOps practices.
Work experience
Senior Software Engineer & DevOps | TypeScript | Node.js | React | GCP
HiPayFreelance
Aug 2023 - Present
3 years 3 months
Remote, OR 97458, USA
Senior Fullstack Engineer (2nd dev) | TypeScript | Node.js | React | AWS | Clean Architecture
Hero : La meilleure façon de payer en B2B.Freelance
Dec 2021 - May 2023
1 year 6 months
Paris, France
Crafting a BNPL (Buy Now, Pay Later) payment solution for the B2B market from scratch : - Integrated payment at checkout with plugins (prestashop, shopify, woocommerce) - Payment by link - Risk scoring engine - Dashboard for admins/merchants/clients Architecture : - Clean Architecture Stack : - TypeScript - Node.js (Express) - React - Jest / Cypress (unit + integration + e2e tests) - GraphQL (TypeGraphQL) - PostgreSQL (TypeORM) - CI / CD (Github Actions) - AWS (Kong, Fargate, S3, Cloud Watch, Secrets) - Terraform - Stripe SDK / Swan SDK
Senior Fullstack Developer, Node.js | React | TypeScript | PostgreSQL | Clean Architecture | DevOps
beta.gouv.frFreelance
Nov 2020 - Dec 2021
1 year 2 months
Remote, OR 97458, USA
Helped to create Potentiel, an open source website aimed to ease the monitoring of the french government financial aid to transition to green energies (solar and wind). Its main purpose is to facilitate the communication between the Ministry of Energy and project holders so that more projects go to completion. Stack : - Node.js - React - Postgresql Architecture : - Clean architecture - CQRS - Event Sourcing
Senior Backend Engineer, Node.js | Vue.js | C# | .NET CORE | Azure
ENGIE DigitalFreelance
Nov 2019 - May 2020
7 months
Paris, France
Working on a project aimed to modelize Engie's hot & cold networks all over the world - Node.js - Vue.js - .NET Core - Azure functions
Frontend Developer, DevOps | JavaSript | Vue.js | Git | Netlify
BigKCoachingFreelance
Apr 2020 - May 2020
2 months
Creation of a macronutriments calculator and custom meal plans for the website BigKCoaching - Vue.js - Netlify
Teacher - Software Design and Programming | JavaScript | Node.js | C#
Université d'Evry-Val d'EssonneFreelance
Oct 2016 - Oct 2019
3 years 1 month
Évry-Courcouronnes, France
On my free time, I teach Software Design and Programing at the University of Evry.
Tech Lead and Backend Engineer | Node.js | JavaScript | Node.js | Express | Mongo | RabbitMQ
FONCIA STARKFreelance
Nov 2018 - Aug 2019
10 months
Région de Paris, France
FONCIA STARK is FONCIA's internal startup. We're crafting FONCIA's future information system which is aimed to do big data. I manage a feature team of 5 developers : - Responsible for the team's delivery - Architecture and code quality - Pull requests reviews - Scrum master - Reporting to the CEO I work on the main API built with : - Node.js - Express - MongoDB (with mongoose) - Tests with Mocha / Chai / Sinon
.NET Backend Engineer / LNG Team | C# | SQL Server | Git | Azure
ENGIE GLOBAL LNG
Jan 2018 - Aug 2018
8 months
La Défense
- Implementing business behaviors within Allegro Horizon CTRM (Commodity Trading Risk Management software, C#) - Making Web Apis (REST, .NET Core) - Agile (scrum) methodology - DevOps with Azure cloud
AXA en France
Dec 2014 - Dec 2017
3 years 1 month
Nanterre-Préfecture
Tech Lead | JavaScript | C#
Feb 2017 - Dec 2017
11 months
Nanterre-Préfecture
Software Engineer | JavaScript | Angular.js | C# | TFS 2013
Dec 2014 - Jan 2017
2 years 2 months
Nanterre-Préfecture
In the CTI (Computer Telephony Integration) department of AXA France, I am responsible for : • Conceiving and developing an automatic calling system (based on Genesys OCS) to help telemarketers reaching more potential clients • Developing applications (C# .NET, AngularJS, RESTful APIs, WCF) • Maintaining legacy code (.NET 2) and trying to reduce the technical debt • Organizing code reviews, pair programing, reinforcing TDD and Software Craftsmanship culture • Creating a software factory with Team Foundation Server (TFS)
Bruneau
Oct 2012 - Dec 2014
2 years 3 months
Courtaboeuf
Automation of UI Testing | C# | Ranorex | TFS 2013
Oct 2013 - Dec 2014
1 year 3 months
Courtaboeuf
In a proactive approach, I suggested to automate non-regression UI test cases on Bruneau's homemade ERP (Sinbad). • Planned the project steps and reports, organized meetings • Compared and chose a testing software (C#) • Developped a testing methodology • Trained teams on the new methodology
Automation of patch delivery | C# | TFS 2012
Oct 2012 - Oct 2013
1 year 1 month
Courtaboeuf
I suggested the lead delivery operator to lessen one of his biggest burdens : the patch delivery. • Conception • Documentation • Development of a C# application that deploys patches on Bruneau's environments. The patch delivery automation allowed the project director to secure and quicken urgent fixes.
Education
Université Évry Paris-Saclay
Master of Science - MIAGE - Apprenticeship (CFA-AFIA)
2012 - 2014
2 years 1 month