Full-Stack Engineer
AI-Powered Products

I ship complete products end-to-end — frontend, backend, and infrastructure — and I'm focused on building AI-powered systems, with deep blockchain experience across Ethereum and Solana.

View ProjectsDownload CV
Years building
5+
Projects delivered
85+
Freelance rating
4.8★

About

Engineer who builds the whole thing

Computer Engineering graduate from NUST with 5+ years building real products: full-stack foundations, a focused push into AI, and deep blockchain experience on top.

I ship products

85+ delivered projects across 3 companies and freelance. I build end-to-end — frontend, backend, deploy — not just prototypes.

Building with AI

Integrating AI into real products — RAG, LLM integration and agentic workflows — on top of solid full-stack foundations and system design.

Blockchain depth

Smart contracts handling real value on mainnet, across both Ethereum (Solidity) and Solana (Rust/Anchor).

Projects

Selected work

Full-stack product work first, then the blockchain builds. Each one highlights the hardest problem I solved, not just the tech used.

Roomy Hotels logo

Full-Stack · Product · Mobile

Roomy Hotels

Direct hotel booking across web, iOS and Android

Hard problem: Built the PHP + MySQL booking backend for the website and iOS/Android apps — date-range availability, two-way channel-manager sync so travel-site bookings never double-sell, and online pre-check-in.

Next.jsReact NativePHPMySQL+1 more
Live site
Boomingo logo

Full-Stack · Product · Payments

Boomingo

Digital loyalty platform with Apple & Google Wallet

Hard problem: Shipped a multi-tenant SaaS end to end — Apple/Google Wallet passes, a cron campaign engine for customer segments, Stripe + RevenueCat billing via webhooks, and a React Native app.

ReactReact NativePHPMySQL+3 more
Live site
Mango DeFi logo

DeFi · Blockchain · Full-Stack

Mango DeFi

Multi-chain token swap with tax token & 5-level referrals

Hard problem: Wrote Rust/Anchor programs that swap through Raydium via CPI with an on-chain fee, a Token-2022 tax token, and a Solidity referral system splitting fees 40/25/15/10/10 across 5 levels.

ReactSolidityRust / Anchorethers.js+6 more
AIChainCoin Staking logo

DeFi · Blockchain

AIChainCoin Staking

Solana staking for a token with a built-in transfer fee

Hard problem: Built Rust/Anchor staking for a Token-2022 fee token: applies the epoch's active fee, stakes only what reaches the vault, and reallocates accounts so a wallet can hold unlimited stakes.

Rust / AnchorSolanaToken-2022React+1 more

More projects

Skills

Tools I build with

A full-stack foundation, an active focus on AI, and deep blockchain experience across two ecosystems.

Frontend

ReactNext.jsTypeScriptJavaScriptAngularReact NativeFlutterTailwind CSSSCSS

Backend

Node.jsExpress.jsPHPREST APIsMySQLPostgreSQLMongoDBFirebase

AI

Currently building
RAG (Retrieval-Augmented Generation)Agentic AILLM IntegrationAnthropic / OpenAI APIsVector DatabasesPrompt Engineering

Blockchain & Web3

EthereumSolanaSolidityRust / Anchorethers.jsweb3.jsSmart ContractsIPFSUniswap / Raydium SDKs

Cloud & DevOps

AWS (EC2, ECS, Lambda, RDS, S3, CloudFront)DockerGitCI/CDBash scripting

Experience

Where I've worked

Three companies and an active freelance track record — full-stack product work with deep Web3 engineering along the way.

Full-Stack Developer · Roomy Technologies

Jul 2023 — Present

Islamabad, Pakistan

  • Built Boomingo, a digital loyalty platform with Apple Wallet & Google Wallet support.
  • Developed automated messaging campaigns based on user activity (inactive users, birthdays, visit history).
  • Built the Roomy Hotels booking backend (roomy.pk): availability, two-way channel-manager sync and online pre-check-in for the website and iOS/Android apps.
  • Built the full stack with PHP, MySQL, React and React Native, plus marketing landing pages.
  • Worked on the ChowPOS frontend; split its sales-report API into progressively loaded sections and added missing indexes.

Full-Stack Web3 Developer · Moaice Pvt Ltd

Aug 2022 — Jun 2023

Islamabad, Pakistan

  • Built NFT minting platforms & marketplaces with React/Next.js, Ethereum/Solana contracts, and Node.js backends.
  • Integrated DEX SDKs (Uniswap, Raydium) and Web3 wallet connectivity via ethers.js and web3.js.
  • Built Flutter ride-sharing apps (driver + customer) with Firebase real-time tracking and auth.

Full-Stack Web3 Developer · Troon Technologies

Nov 2021 — Jul 2022

Islamabad, Pakistan

  • Built NFT minting platforms for clients on Ethereum and Solana.
  • Built a Solana blockchain game's Rust contracts and worked on its Node.js backend for transaction co-signing.
  • Created token, NFT, staking and airdrop contracts on both chains with integrated DEX functionality.

Freelance Blockchain Developer · Fiverr

Nov 2021 — Present

Remote

  • Completed 85+ orders across DeFi, NFT and Web3 with a 4.8/5.0 rating from 61 reviews.
  • Built ERC-20/721/1155 and SPL tokens with custom tokenomics and transfer restrictions.
  • Created staking platforms, swap interfaces and DeFi protocols integrating Uniswap and Raydium.

BS, Computer Engineering

National University of Sciences & Technology (NUST) · 2017 — 2021 · Islamabad, Pakistan

Let's build something

I'm open to full-stack and AI engineering roles, and select freelance work. The fastest way to reach me is email.

Based in Islamabad, Pakistan

saadqayyum794@gmail.com