Guillaume Lancrenon
Senior Software Engineer at Cockpit
Paris, Ile-de-France
Summary
🤩
Rockstar🎓
Top SchoolGuillaume Lancrenon is a Senior Software Engineer and AI practitioner based in Paris with a decade of experience building full-stack, cloud-native products and founding multiple startups. He blends hands-on backend and frontend work (React, Vue, Node, Python, TypeScript) with product leadership—co-founding Cockpit and shipping two AI-driven products while serving as Senior Software Engineer at Twenty. An active open-source contributor, he has improved backend orchestration and demos in notable projects like deepset-ai/haystack and doccano and helped build a community-driven CRM alternative at twentyhq/twenty. His background spans data-heavy government and industrial projects—from predictive emergency models for the French Interior Ministry to seismic data acquisition at Schlumberger—giving him a pragmatic edge in productionizing ML systems. Trained at CentraleSupélec and Paris Dauphine, he combines rigorous engineering fundamentals with entrepreneurial execution and a knack for turning annotated datasets into usable QA models.
10 years of coding experience
10 years of employment as a software developer
Master of Science (MS) in Engineering Energy Signal processing Advanced Programming, Master of Science (MS) in Engineering Energy Signal processing Advanced Programming at CentraleSupélecLicence Economie appliquée, Licence Economie appliquée at Université Paris Dauphine - PSL
English, Spanish, French
Stackoverflow
1,557reputation
216kreached
10answers
7questions
laravel
top-5%
javascript
top-5%
axios
top-1%
Github Skills (60)
transformers10
api-rest10
python10
api-design10
restful-api10
django10
authentication10
typescript10
user-authentication10
templater10
template-engine10
large-language-models10
axios10
retrieval-augmented-generation10
typescript-types10
Programming languages (13)
Github contributions (5)
twentyhq/twenty
Oct 2024 - Apr 2025
Building a modern alternative to Salesforce, powered by the community.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:1 release, 170 reviews, 148 PRs in 5 months
Contributions summary:Guillaume primarily worked on backend and frontend features, fixing API authentication issues by modifying JWT strategy and improving code. They implemented and updated frontend components for object record functionalities. Additionally, they integrated a search function and added features to settings form selection, contributing to overall improvements in user experience.
crmcrm-systemgood-first-issuegraphqljavascript
deepset-ai/haystack
Jun 2020 - Jun 2021
AI orchestration framework to build customizable, production-ready LLM applications. Connect components (models, vector DBs, file converters) to pipelines or agents that can interact with your data. With advanced retrieval methods, it's best suited for building RAG, question answering, semantic search or conversational agent chatbots.
Role in this project:Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:1 review, 14 commits, 20 PRs in 1 year
Contributions summary:Guillaume primarily contributed to the backend functionality and configuration of the Haystack framework. They made modifications to the REST API, including enabling new features and adjusting the configuration. They also addressed the setup and integration of Docker, and updated tutorial links. Additionally, the user improved the documentation, corrected typos, and made adjustments to configuration settings, showcasing a commitment to improving the overall user experience and maintainability.
pythonbertfinetuningproduction-readyhuggingface-transformers
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