Guillaume Baelen
Backend & Cloud Engineer | Real-Time Systems
Salaire / Taux journalier
Nantes, France
Freelance
À distance uniquement
Expertises
Langues
À propos
Introduction
Senior backend & cloud engineer specializing in distributed, real-time systems. I help startups and scale-ups build high-performance backends, data pipelines, and AI-powered services. Expertise in Go, Python, Node.js, Kubernetes, Terraform, PostgreSQL, Redis. Full project ownership with focus on reliability and scalability.
Expérience de travail
Freelance Backend & Cloud Engineer
Self-employedFreelance
mars 2024 - Présent
2 ans 8 mois
À distance
Senior engineer delivering backend systems, real-time features, data pipelines, and AI-powered services for startups and scale-ups. I design and implement scalable architectures from scratch, ensuring reliability under high load. I integrate external APIs and AI models, automate deployments, and maintain cloud infrastructure. I collaborate closely with product, data, and frontend teams to translate requirements into high-performance, production-ready systems. Notable freelance missions: Peer: Developed a large-scale metaverse-style platform with AI-powered features. Built real-time voice chat using QUIC, dynamic matchmaking, and map-based interactions. Integrated AI companions capable of autonomous interactions and external data retrieval. Maintained cloud infrastructure for high concurrency and reliability. Main tech: Go, Python, AWS, Kubernetes, Bazel. Other smaller missions: Built MVPs and platforms from scratch, including travel platforms, AI voice companions, and startup backends. Tech: Python, Node.js, Go, React, AWS, Kubernetes, Terraform, PostgreSQL, Redis.
Software Engineer
Lhyfe
nov. 2021 - mars 2024
2 ans 5 mois
Nantes, France
First engineer at a green hydrogen startup, responsible for building the initial backend platform for production planning across multiple factories. Integrated IoT data, weather forecasts, and predictive AI models to optimize factory scheduling and deliveries. Developed automated data pipelines and cloud infrastructure, enabling scalable, reliable, and maintainable systems. Collaborated with operations, production, and delivery teams to align technical solutions with business needs. Main tech: Python, React, PostgreSQL, TimescaleDB, Terraform, AWS.
ProctorExam
janv. 2018 - août 2021
3 ans 8 mois
Amsterdam Area, Netherlands
Software Developer
juil. 2018 - août 2021
3 ans 2 mois
Amsterdam Area, Netherlands
Developed and maintained the backend for an online exam platform with real-time video streaming and remote proctoring. Designed and optimized scalable WebRTC architecture, automated video processing pipelines, and ensured high system reliability under production load. Worked across Ruby on Rails, Node.js, Python, and WebRTC, deployed on Kubernetes and AWS with PostgreSQL backend. Collaborated with small cross-functional teams to deliver new features, improve performance, and maintain production stability.
Intern developer
janv. 2018 - juil. 2018
7 mois
Amsterdam Area, Netherlands
- Researched and designed computer vision algorithms for automating student monitoring and real-time cheating detection - Developed and integrated a new interface for the examination page in React (including video feed of the streams of the student) - Designed and implemented the LTI protocol for integration with leading LMS platforms.
Developer R&D system (Internship)
Stormshield
sept. 2016 - déc. 2016
4 mois
Villeneuve-d'Ascq, France
Study of HTTP2 integration solution for the firewalls' firmware. Creation of POC for the study of the overhaul of the firewall proxy. Created parsing script in PERL for the firewalls' logs.
Developer web (Internship)
SkyLantern Original
janv. 2016 - mai 2016
5 mois
Developed features for prestashop (PHP, HTML, SMARTY). Created modules for prestashop.
Management internship
COURRIER PLUS
juin 2015 - août 2015
3 mois
Helped to the study of the settings up of an ERP. Classified of the company's customers.
Webmaster (Internship)
Leon Paul Equipment Co. Ltd
janv. 2015 - mai 2015
5 mois
Londres, Royaume-Uni
Updated the website leonpauljuniorseries.com to DRUPAL 7. Created web pages with Wordpress for the website sallepaul.co.uk. Edited and published on YouTube presentation videos with Sony Vegas Pro.
Network administrator (Internship)
KOODZA
juin 2014 - août 2014
3 mois
Setting up the proxy Zscaler and navigation rules for the company's stores. Created scripts for the installation of the RFID servers.
Management internship
Banque Populaire du Nord
sept. 2013 - oct. 2013
2 mois
Reliability of savings files. Checked the conformity of the customers' contracts.
Database manager (internship)
Kalyptus Recrutement
juil. 2013 - août 2013
2 mois
Updated the resume of the company's database.
Formation
Télécom Lille
Diplôme d'ingénieur
2012 - 2018
6 ans 1 mois