Freelancer profile translated to English.
Back to original languageAbout Guillaume
Tech Lead / Senior Fullstack Engineer & AI – TypeScript, Node.js, React, AWS
13 years of experience as a fullstack lead developer, designing and managing complex web products end-to-end, from defining requirements to production deployment.
Last long-term assignment: Tech lead at SNCF, fully remote, delivered two national-scale HR tools, V1 in under 6 months, drastically reduced processing time, secured additional funding based on initial results.
I integrate AI into reliable production architectures: Whisper voice transcription pipeline, distributed asynchronous processing on AWS Batch, LLM API integration.
Tech Stack
How I work
Fully remote for over ten years. Long-term assignments, real technical ownership, complete autonomy. Rigorous, proactive, quick to adapt to existing contexts.
"Flexible, patient, a great trainer, and proactive. Working with him was a very good experience." (SNCF DGEX Solutions, 2.5-year assignment)
What I'm looking for
An ambitious assignment with a true product culture, fully remote, potentially in a context where AI is concretely integrated: transcription, agent orchestration, or LLM integration.
English
Fluent
Spanish
Conversational
Portuguese
Native or bilingual
French
Native or bilingual
Remote only
Primarily works remotely
Experience
- SaaS de sous-titrage vidéo automatiséFullstack / Ops DeveloperFILM AND AVAugust 2024 - November 2024 (2 months)Paris, FranceAutomated voice transcription pipeline (Whisper) with asynchronous distributed processing on AWS Batch, architecture comparable to production Speech-to-Text use cases for healthcare, media, or education.Design, development, and deployment of an automatic subtitling SaaS with custom style overlay, from concept to production architecture.Application: Next.js / TypeScriptAI Processing: Python, Whisper (voice transcription), FFmpeg (video processing)Cloud Architecture: AWS EC2, Batch (on-demand distributed asynchronous pipeline), S3Infrastructure as Code: PulumiDatabase: MongoDBPersonal entrepreneurial project developed with full autonomy: architecture, development, deployment, infrastructure.
- SNCF DGEX SolutionsLead Fullstack Developer Angular / Node.jsTRANSPORTATIONMay 2021 - December 2023 (2 years and 7 months)As Lead Fullstack Developer, I managed the technical aspects and participated in the development of two major HR digitalization projects at SNCF: a scheduling management tool and an integrated HR planning system, both at a national scale.I oversaw the technical aspects from design to implementation, handling architectural choices, development, and deployments.Using technologies like Angular, Node.JS, MongoDB, PostgreSQL, and OPS tools (Jenkins, Helm, Kubernetes), I led these projects with deep commitment, addressing technical and operational challenges.Results: Transition from paper and pencil to a complete digital solution, integrating an automatic planning and scheduling optimization engine. 2.5-year assignment in full remote with a technical reference role. Radical transformation of the job, significant reduction in planning time, and reliable production across the country.
- Les MitronsFullstack Architect Developer Ionic / Angular / Node.jsRESTAURANTS AND FOOD SERVICEFebruary 2021 - March 2021 (2 months)V2 update (backend and frontend) of the Les Mitrons application available on Android and iOS (Ionic / Angular Application).Integration of new views from mockups.Implementation of new features including:- Deep link management- Recipe sharing, via automatic screenshot or deep link (SMS / email, etc.)- Translation support: development of a translation system for database entities, and use of i18n on the app side for in-app wording- Added support for recipe-associated photos (with Amazon S3)- UI / UX improvement (API and request optimization, addition of a filtering system on various entities, etc.)Database updatePublication and deployment of mobile applications and the server.
Reviews
Colette
SNCF DGEX Solutions - Paris - AST&Digital
Reviewed on 1/10/2024
Guillaume just finished a 2.5-year assignment with us. He served as the lead fullstack developer within a small team of 2-3 developers and delivered very high-quality work. Guillaume was 100% remote, and it worked very well. He proved to be flexible, patient, a great trainer, and proactive. Working with him was a very good experience, and I recommend him without hesitation.
Colette
SNCF DGEX Solutions
Reviewed on 7/23/2021
These first two months of the assignment with Guillaume went very well. Guillaume is comfortable in web application development and is proactive. He is attentive, organized, and rigorous; I highly recommend him.
Recommendations
CB
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Education
- Master Software ArchitectInsta Paris2015
- Computer Science DegreeUniversité Diderot (Paris VII)2013
Certifications
- Artificial Intelligence (Introduction: Machine Learning, Neural Networks, Deep Learning)IPCA (Instituto Politécnico do Cávado e do Ave)2024
- Introduction to Corporate Social Responsibility (CSR) for DevelopersSNCF2023