Christophe Le Bars, Developer in Paris, France
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Christophe Le Bars

Verified Expert  in Engineering

Software Architect and Developer

Location
Paris, France
Toptal Member Since
November 6, 2018

Christophe has more than two decades of experience in web technologies, blockchain, and AI, so he knows how to speak to machines, and scalable architectures are his stomping ground. Christophe specializes in projects using open source software, and the last iteration of his preferred stack includes LangChain, Solidity, JavaScipt/Node.js, and Redis.

Portfolio

docAnalyzer
Redis, JavaScript, LangChain, OpenAI GPT-3 API, System Architecture...
The Rouge Project
Solidity, Ethereum, Svelte, System Architecture, Software Architecture...
Tribe Global, Inc.
Solidity, Ethereum Smart Contracts, Blockchain, APIs, Cloudflare, Back-end...

Experience

Availability

Part-time

Preferred Environment

Svelte, Solidity, Redis, Node.js, Linux, JavaScript, Decentralized Finance (DeFi)

The most amazing...

...thing I’ve made was a blockchain protocol to manage any kind of voucher; blockchain immutability and adversarial context are not forgiving!

Work Experience

AI Expert / Architect

2023 - 2023
docAnalyzer
  • Led a team of five in designing from scratch and developing a SaaS AI online tool to analyze customer documents using LLM and allow ChatGTP-like conversations with the data.
  • Designed the service's unique value proposition—a collection of AI-independent agents to improve the classic prompt/answer efficiency and relevance.
  • Onboarded more than 5,000 users in less than 60 days.
Technologies: Redis, JavaScript, LangChain, OpenAI GPT-3 API, System Architecture, Software Architecture, Architecture, Data Architecture, Code Architecture, Svelte, Full-stack, Docker, APIs, JSON API, Functional Programming, ChatGPT, CTO, Python, Microservices, Microservices Architecture, CI/CD Pipelines, Integration Testing, Leadership, Technical Architecture, CSS, HTML, Asynchronous Programming, Web Development, Startups, OpenAI GPT-4 API, Proof of Concept (POC), REST APIs, Full-stack Development, Artificial Intelligence (AI), Back-end, Back-end Development, GPT, Generative Pre-trained Transformers (GPT), Webhooks, NoSQL, Language Models, Prompt Engineering, Hugging Face, Chatbots, REST, Natural Language Understanding (NLU), Natural Language Processing (NLP), OpenAI, Large Language Models (LLMs), Vector Databases, Retrieval-augmented Generation (RAG), Front-end Development, Back-end Performance, Design Language

Architect

2017 - 2023
The Rouge Project
  • Led a team of six and developed the Rouge blockchain protocol's concept, white paper, and architecture.
  • Built a token bridge between POA and Ethereum and Implemented the blockchain protocol for voucher-type objects on the Ethereum and many L2-like Arbitrum blockchains with Solidity.
  • Spoke as a technical speaker at a conference. Acted as a pre-sales technical engineer.
  • Led the development of many DApps using Ethereum and Svelte.
Technologies: Solidity, Ethereum, Svelte, System Architecture, Software Architecture, Serverless Architecture, Architecture, JavaScript, Blockchain, Full-stack, Docker, JSON API, Web3.js, Ethereum Smart Contracts, Microservices, Microservices Architecture, CI/CD Pipelines, Integration Testing, Leadership, Technical Architecture, CSS, HTML, Asynchronous Programming, Web Development, Startups, Proof of Concept (POC), Smart Contracts, Truffle, REST APIs, Full-stack Development, Back-end, Back-end Development, NoSQL, Game Development, REST, Front-end Development, Back-end Performance, Design Language

Back-end and Smart Contracts Senior Developer

2021 - 2022
Tribe Global, Inc.
  • Developed all smart contracts that represent asset classes in a car racing game.
  • Developed lean back ends for authentication, onboarding, and game assets management using Redis, Cloudflare, and Node.js.
  • Created a blockchain-based system for game characters' skill tracking.
Technologies: Solidity, Ethereum Smart Contracts, Blockchain, APIs, Cloudflare, Back-end, REST, Google Cloud Platform (GCP), Front-end Development

Contractor

2020 - 2021
Gensler
  • Refactored a content/files synchronization framework in Node.js to improve its reliability and flexibility.
  • Built an engine to dynamically and automatically create GraphQL schemas and relevant queries from third parties' CMS and a choice of entry points.
  • Added CI using npm packages and Git modules and integrated the new framework with the ELK stack.
Technologies: Node.js, GraphQL, ELK (Elastic Stack), System Architecture, Software Architecture, Architecture, Data Architecture, Code Architecture, JavaScript, Microservices, Integration Testing, Technical Architecture, CSS, Asynchronous Programming, Back-end, Back-end Development, Front-end Development, Design Language

Contractor

2019 - 2020
Sora
  • Designed the general architecture of an API automation platform from scratch (ZapierTray.io like) using Node.js and Redis. Built a GraphQL interface to interact with the platform.
  • Designed an abstract language to describe the orchestration of any complex third-party API events and actions with advanced control flow (loop, concurrence, call, and more). Built a compiler for that language.
  • Built a scheduler/worker daemon to handle the secure execution of automation workflows of many third-party APIs.
Technologies: React, GraphQL, Redis, Node.js, System Architecture, Software Architecture, Automation Tools, Architecture, Data Architecture, Code Architecture, JavaScript, API Integration, APIs, Amazon Web Services (AWS), Asynchronous I/O, Microservices Architecture, CI/CD Pipelines, Integration Testing, Technical Architecture, CSS, HTML, Asynchronous Programming, Web Development, Startups, Proof of Concept (POC), REST APIs, Workflow Automation, Full-stack Development, Back-end, Back-end Development, Slack API, Webhooks, Microsoft Teams, NoSQL, WebSockets, REST, Google Cloud Platform (GCP), Front-end Development, Back-end Performance, Design Language

Contractor

2019 - 2019
Mati
  • Built a Node.js daemon serving tokens able to circumvent a captcha-protected web page.
  • Created a microservice, using OpenCV, that's able to rotate automatically random low-quality photos to realign a barcode.
  • Implemented Docker containers for multi-stage builds and deployment.
Technologies: OpenCV, RabbitMQ, Docker, Node.js, Software Architecture, Architecture, JavaScript, Elasticsearch, CI/CD Pipelines, CSS, Startups, Proof of Concept (POC), Back-end, Back-end Development, Webhooks, Front-end Development

CTO

2004 - 2017
Spill
  • Acted as the architect and lead developer for over 100 websites, mobile apps, and eCommerce platforms.
  • Architected four iterations of the online "trendiest store in the world" (according to Forbes): Colette.fr.
  • Developed one of the very first online streaming platforms for classical music.
  • Worked as the digital innovation strategist of the company.
  • Created an in-house customer eShop framework using Catalyst and DBIx::Class.
Technologies: Catalyst, Perl, Nuxt.js, Vue, Node.js, System Architecture, Software Architecture, Serverless Architecture, Architecture, Code Architecture, JavaScript, Full-stack, JSON API, Functional Programming, eCommerce, CTO, Leadership, Technical Architecture, CSS, HTML, Web Development, Proof of Concept (POC), Content Delivery Networks (CDN), Video Streaming, REST APIs, Full-stack Development, Back-end, Back-end Development, Webhooks, NoSQL, WebSockets, REST, PHP, Front-end Development, Back-end Performance

Gensler

I refactored a content/file synchronization framework in Node.js to improve its reliability and flexibility. I specifically built an engine to dynamically and automatically create GraphQL schemas and relevant queries from third parties' CMS and a choice of entry points.

The Rouge Project | Voucher and Note Protocol

An open-source and multi-blockchain protocol to be able to securely transfer any kind of certificate of financial value between market participants (discount coupons, tickets, vouchers, and more).

Shakespeare and Company | Online Bookstore

Shakespeare and Company is the name of an independent English-language bookstore that has existed on Paris's Left Bank for a number of years now. Now, they are also selling millions of books online.

Colette.fr | eStore

Colette is a constantly evolving and on the edge of the technology eStore with millions of visitors. For example, the website was one of the first in the world to be fully AJAX-based in 2005.

Medici.tv

http://medici.tv
The world's leading classical music channel, Medici.tv, has offered access to the best of classical music to viewers worldwide since 2008.

Languages

JavaScript, Solidity, Perl, GraphQL, HTML, Bash, SQL, CSS, C, PHP, OCaml, Reason ML, Python, Caml

Frameworks

Nuxt.js, OAuth 2, Truffle, Serverless Framework, Svelte, Koa, JSON Web Tokens (JWT), Catalyst

Libraries/APIs

JSON API, Node.js, Web3.js, Vue 2, REST APIs, Vuex, Slack API, Vue, OpenCV, React, Google APIs

Tools

Git, KVM/Qemu, Makefile, Remix IDE, NGINX, Microsoft Teams, Mercurial, Exim4, Squid Proxy Server, NativeScript-Vue, Babel, RabbitMQ, ELK (Elastic Stack)

Paradigms

Automated Testing, Requirements Analysis, REST, Asynchronous Programming, Microservices Architecture, Functional Programming, Serverless Architecture, Microservices, Agile Workflow

Platforms

Blockchain, Ethereum, Linux, Moose, Debian, KVM, Vercel, Google Cloud Platform (GCP), Apache2, AWS Lambda, Docker, Amazon Web Services (AWS)

Storage

Databases, Redis, Elasticsearch, MySQL, PostgreSQL, NoSQL, SQLite, Memcached, SQL Functions

Other

Software Architecture, API Integration, Automation Tools, Cryptocurrency, Information Security, Architecture, APIs, System Architecture, Data Architecture, Code Architecture, Full-stack, eCommerce, Ethereum Smart Contracts, Smart Contracts, Non-fungible Tokens (NFT), Web 3.0, OpenAI GPT-3 API, OpenAI GPT-4 API, CTO, ChatGPT, Artificial Intelligence (AI), Asynchronous I/O, CI/CD Pipelines, Integration Testing, Leadership, Technical Architecture, Web Development, Startups, Proof of Concept (POC), Web3, Decentralized Finance (DeFi), Content Delivery Networks (CDN), Video Streaming, Workflow Automation, Full-stack Development, Back-end, Back-end Development, GPT, Generative Pre-trained Transformers (GPT), Webhooks, Prompt Engineering, Chatbots, OpenAI, Vector Databases, Retrieval-augmented Generation (RAG), Front-end Development, Back-end Performance, Design Language, Interpreter Design, Web UX, Debian Packaging, Serverless, Cloud, Domain Name System (DNS), Servers, Server Migration, Payment Security, Encryption, WebSockets, Game Development, Language Models, Hugging Face, Large Language Models (LLMs), Natural Language Understanding (NLU), Natural Language Processing (NLP), Mojo.js, Compilers, SSH, Proxy Servers, Iptables, SSL, Payment Gateways, BuckleScript, LangChain, Storybook, Cloudflare

1994 - 1995

Master's Degree in Computer Science

Paris-Sud University - Orsay, France

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