Grégoire Jorant-Houzé

Development of various services for web3 mini-games on Telegram.

✔ Design and deployment of a robust and scalable API foundation with NestJS/Node.js, shared packages, and launchers and overlays with Reactjs for mini-games

✔ Design and implementation of payment systems common to the different mini-games:

-> Multi-currency support: TON cryptocurrencies (Telegram blockchain) & Solana, Telegram Stars, and internal virtual currency

-> Asynchronous, atomic, and resilient transactional orchestration (pub/sub, retries, supervision)

✔ Development of a "provably fair" random selection system:

-> Development of a random number generator and verifier via Arbitrum (Ethereum L2) to ensure transparency for players

✔ Deployment & Operations:

-> GCP Cloud, Backend services containerized on Google Cloud Run; Use of ioredis/redis and redlock for caching and distributed locks; PostgreSQL database

-> Reactjs frontends hosted on Firebase Hosting and launched via Telegram Mini-Apps/Bots; CDN & Cloudflare protection

Development of a web portal for generating and accessing virtual metaverse events in a Web3 Ethereum environment.

Main missions:

✔ Development of a platform for generating and managing virtual events:

-> Development of the backoffice platform for creating, configuring, deploying, and managing virtual events.

✔ Development of the portal for accessing events and related communities

✔ Development of an Analytics system:

-> Implementation of real-time sending, aggregation, and conversion of event data into parquet format using AWS Kinesis, AWS S3

-> Classification and preparation of data for querying with AWS GLUE

-> Setup of scheduled queries to establish statistics and leaderboards for events

✔ Payment system with Stripe:

-> Integration of a secure payment system with Stripe to implement a paid/VIP access system for events

✔ Web3 payment and marketplace system:

-> Creation of an NFT marketplace usable by event-related communities

-> Integration of Web3 payments and minting of event-related NFTs to benefit from additional services/privileges

Technical environment:

-> Back: Nestjs, Nodejs, Docker, Redis, ETH Blockchain

-> Front: Reactjs

-> Cloud and CI/CD: AWS

Web3 and FullStack Typescript (NestJs & Svelte) Developer

Concept

-> Creation of a browser-based web3 video game initially built on the Solana blockchain. It is a turn-based strategic card game with a free-to-play model. The game offers the potential for over 1.5 million unique cards that players can generate as NFTs in exchange for in-game resources or rewards.

Version 1: fully on-chain backend

-> 100% on-chain backend design: development of Solana smart contracts/programs in C covering all game functionalities: dynamic generation of character NFTs, creation of user accounts and their teams, marketplace, battles, etc.

-> On-chain storage of player data via cNFTs for reduced creation costs

-> User interface with Svelte and deployed on AWS Amplify

Version 2: Web 2 replatforming, optimizations, and transition to a free-to-play model.

-> Redesign of the backend infrastructure to Web 2 to remove on-chain cost and latency constraints: migration to a NestJS / Node.js backend exposed as a REST API and orchestrated on AWS ECS + Fargate to ensure scalability and high availability. Implementation of CI/CD via AWS CodePipeline and AWS CodeBuild.

-> Setup of a PostgreSQL database via AWS RDS for user data storage and a Redis database via AWS ElastiCache for caching & distributed locks.