Freelancer profile translated to English.
Back to original languageAbout Romain
Full Stack Web Developer JavaScript / TypeScript
I am a self-employed full-stack developer specializing in the design and development of high-performance web applications and intelligent bots (notably Telegram).
With over 4 years of experience, I notably designed and maintained Spybot, a comprehensive real-time Solana wallet tracking application:
Robust backend (Node.js, Fastify, MongoDB, Redis, BullMQ)
Blockchain processing (multi-protocol decoding, DEX interactions, notifications)
Web App with Telegram authentication and administration dashboard
WebSockets (Socket.io) and real-time architecture
This experience allowed me to master the entire stack: from frontend to infrastructure, including APIs and production deployment.
I can create for you:
Development / redesign of web applications (React, Svelte, Next.js)
Advanced Telegram bots and business integrations
Showcase websites, landing pages, and complex interfaces (pixel perfect & responsive)
Optimization and bug fixing on existing React projects
API integrations, databases, and real-time solutions
Deployment, hosting, and turnkey delivery
Main Stack:
Frontend: React, Svelte, Next.js, TypeScript, TailwindCSS
Backend: Node.js, Fastify, Express, MongoDB, Redis
Other: Telegram Bots (Grammy), Socket.io, Solana/Web3, Claude Code (daily use), Git, Figma
Passionate about technical challenges and AI-assisted development, I am committed to delivering clean, maintainable, and results-oriented code.
Feel free to contact me to discuss your project, whether it's a web application, a bot, a redesign, or a bug fixing/optimization mission.
Available immediately and responsive for short or medium-term projects. Daily rate adaptable according to the technicality and duration of the project.
See you soon! 👋🏻
French
Native or bilingual
English
Native or bilingual
Can work on-site
Ruoms (up to 50km)
Experience
- SpybotLead Developer / Full-Stack Developer — Bot & Web-App SolanaTECHMarch 2024 - Today (2 years and 3 months)Real-time Solana wallet tracking application: Telegram notifications, Web App (same product on the client-side, with Telegram authentication), multi-protocol decoding, application API, in-app trading; design, functional evolutions, performance, and production deployment on dedicated infrastructure.✓ Design and maintenance of a Node.js microservices architecture (blockchain ingestion, parallel workers, REST APIs, real-time).✓ Webhooks + gRPC pipeline, BullMQ queues, Redis cache and sessions, MongoDB persistence (targeted use of PostgreSQL / Drizzle as needed).✓ Decoding of Solana transactions (DEX, NFT, bridges...) via extractors and Anchor IDL, business enrichment for notifications.✓ Telegram Bot (menus, sessions, multi-commands) with sending queues, deduplication, and user rate limiting.✓ Bot-related Web App: "app"-like experience within Telegram, with auth flow based on Telegram (user access aligned with the bot account).✓ Secure Fastify API (JWT) + WebSocket (Socket.io) for the app; dedicated Admin API for a management dashboard (monitoring, product settings, backend control — admin frontend in a separate project).✓ In-app trading module (Jupiter, Pump.fun, latency constraints on the critical path).✓ Operations: multi-process PM2 deployment, dev / production environments, queue and load monitoring.
- EMD-SolarWeb IntegratorENERGY AND UTILITIESApril 2023 - April 2023Web Integrator for a Lead Acquisition Website / Landing Page.✔ 100% Responsive Figma mockup integration with HTML, CSS✔ Creation of dynamic features with JavaScript✔ Setup of a Contact Form received via the Client's email✔ Setup of a Questionnaire received via the Client's email using PHP✔ Website deployment, hosting & Domain Name on Hostinger
- Solset.ioReact DeveloperTECHJanuary 2023 - March 2023 (2 months)Project: Automatic NFT purchase bot on the Solana Blockchain.I am the Frontend Developer for the web application in React Js:✔ 100% Responsive Figma mockup integration✔ Authentication with a Crypto wallet, Web3js & solana/wallet-adapter✔ Route management with React router✔ Component logic creation✔ Connection to various APIs with axios & Postman✔ Connection to Websockets with Socket.io✔ Versioning with Github
Reviews
Benjamin
Benjamin Kaminski
Reviewed on 4/4/2023
Efficiency guaranteed, seasoned developer with a keen eye for detail, proactive, pragmatic, Romain possesses all the qualities you would want in an integrator. I highly recommend him.
I
Irwyn
Solset.io
Reviewed on 3/28/2023
This is the second time we have worked with Romain, and he has managed to exceed our expectations.
Romain has demonstrated his expertise in React.js and worked on complex data visualization and user interactions.
He was proactive and communicative throughout the project, offering functional and elegant solutions. He also collaborated effectively with the backend developers for a smooth and efficient integration.
The final result is a high-quality, responsive, and aesthetically pleasing web application that has received positive user feedback.
We are grateful to have worked with Romain and would not hesitate to recommend him to anyone looking for a talented and reliable frontend developer.
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Certifications
- Learn to program with JavaScriptOpenclassrooms2022
- Create dynamic web pages with JavaScriptOpenclassrooms2022