romainc

Contributed to the maintenance and optimization of a large-scale backend system aggregating marketplace data flows for major companies such as Total, Veepee, and other high-volume partners. The platform handled millions of live orders, products, and merchant interactions, with strict requirements for uptime and scalability. 🔹 Platform Maintenance • Ensured production-level security, performance, and availability • Proactive resolution of incidents and anomalies • Continuous system updates to maintain large-scale stability 🔹 Data Management & Scalability • In-depth database analysis to identify performance optimizations • Data cleanup and archival strategies for cost and efficiency control • Large data volume handling to ensure responsiveness and cost-effectiveness 🔹 Tech Stack • Python / Django, SQL, high-volume big data environment

🔹 Web3 Wallet Design and development of a Web3 wallet aimed at a mainstream audience. I expanded the initial product vision to include an integrated messaging system and community hubs inspired by Discord (public and private). • Built a basic messaging system (SQL storage, prototype version) • Community hubs: creation, management, interface • Secure authentication via JWT signed by external wallets (Metamask or Phantom) or password • Functional prototype tested internally • Initial frontend development (POC), later handed off to a dedicated team 🔹 Crypto Swapper Design and development of an integrated crypto swapper. Originally based on Uniswap V3 and forks (e.g. Pancake), with an extensible architecture allowing computation of optimal swap paths (customizable number) across multiple DEXs. • Custom algorithm to compute top swap paths (no overlap), handling gas and hop constraints (Dijkstra and A* unsuitable) • Developed a Rust module for high-performance route computation • Price extrapolation using optimized sampling on a logarithmic scale to model Uniswap V3 liquidity curves • Real-time blockchain monitoring for pool price changes • Automatic detection of newly created pools • Fine-tuned RPC query optimization • Smart contracts in Solidity: multi-DEX swap with fee capture in a single transaction • Handling of atypical tokens and unstable price behaviors 🔹 Shared Tech Stack • Frontend: Angular (TypeScript), Metamask & Phantom integration (provider, account/chain switching), POC implementation • Backend: FastAPI (Python) + REST API, SQLAlchemy • Blockchain: web3.py · Solidity · Hardhat · deployed on Ethereum Reference: Bertrand Perrin — linkedin.com/in/bcperrin

Design and development of a blockchain-based game platform — https://www.orilys-conquest.com Players and early investors could buy the game's cryptocurrency and NFTs, with resale directly available on the platform. An affiliate system was integrated to boost visibility. The UI was specifically designed to remain accessible for crypto newcomers, while offering a smooth and ergonomic blockchain experience. 🔹 Frontend • Angular (TypeScript) • Metamask integration: provider, account and chain switching • Game-oriented components focused on conversion and onboarding 🔹 Backend • Django (Python) + REST API, SQL database • Blockchain interaction via web3.py • Management of users, in-game resources, and rewards 🔹 Blockchain • Smart contracts in Solidity: ERC20, ERC721, marketplace, minters • Development with Hardhat & Remix IDE • Deployment on Mumbai (testnet), then Polygon (mainnet)

Design and development of a full training environment for a neural network aimed at detecting fake ID cards from image analysis. 🔹 AI Modeling & Training • Dynamic preprocessing, multi-dataset management • Optimization for constrained servers (multi-network setups, memory tuning) • Architectures: ResNet, EfficientNet • Training with PyTorch Lightning on Docker server 🔹 Web Demo • Web app allowing users to test the AI by uploading images • User authentication, confidence score display for each analysis 🔹 Fullstack Tech Stack • Frontend: Angular • Backend: Django (Python), PostgreSQL • Deployment: AWS EC2

Full design and development of a crypto-enabled e-commerce platform, accepting cryptocurrencies (ETH, USDT, etc.) with automatic conversion to euros for supplier payments. Included multi-chain support, floating exchange rates, and an optimized user experience. 🔹 UX/UI • Optimized checkout: group purchases, bundles, discounts • Smooth and simplified user journey for non-technical profiles 🔹 Frontend • React (TypeScript) • Metamask integration (provider, account/chain switching) • UI management of multiple blockchains and cryptocurrencies 🔹 Backend • Django (Python) + REST API • Robust database architecture • Blockchain integration using web3.py 🔹 Blockchain • Smart contracts in Solidity: ERC20 • Development with Hardhat & Remix IDE • Deployment on Mumbai (testnet), then Polygon

Design and development of an e-commerce platform specialized in the sale of resin-printed figurines. Users could submit their own models to expand the catalog, promoting a creative and community-driven approach. 🔹 UX/UI • Optimized checkout flow: fewer steps, bundles, special offers • Smooth, conversion-oriented navigation experience 🔹 Frontend • React (TypeScript) • Responsive layout with catalog and product detail views 🔹 Backend • Django (Python) + REST API • Full database architecture: product, user, and order management