Arsalan S.

I build production systems that hold up under real load — platforms serving thousands of active users and processing hundreds of thousands of transactions daily. Over 8 years I've delivered full-stack applications and on-chain infrastructure for clients across the US, Europe, Mexico, and Australia. On the web, I architect with React/Next.js and Node.js/Express against MongoDB, with an emphasis on the parts that break at scale: authentication, dynamic role-based access control, transaction integrity, and API design that stays fast as data grows. On-chain, I work in Solidity/Hardhat — writing, testing, and deploying smart contracts, including a wallet-signed deployment architecture that keeps private keys out of the codebase entirely. Infrastructure runs on AWS, DigitalOcean, and Vercel. Recent work includes a high-volume transaction platform handling six-figure daily throughput, an AI-powered smart contract auditing SaaS built on Node.js and the OpenAI API, and multi-codebase products spanning a Node.js backend, Flutter mobile app, and React admin dashboard with granular permission systems. What you get: phased delivery with reviewable commits at each step, clear communication, and an engineer who designs for the failure cases — concurrency, security, and data consistency — not just the happy path. I specialize in complex builds where architecture is the difference between a system that scales and one that stalls. If you have a web or blockchain project that needs to be built to production standards the first time, send me a message and let's talk through it.