Senior Full-Stack & Blockchain Engineer
at Relymer Group · Islamabad, Pakistan
I ship production React & Next.js applications, Node.js APIs, and audited Solidity smart contracts for clients worldwide.
Sr. Full-Stack & Blockchain Engineer
Started as a freelance web dev in 2019, joined Relymer Group in 2021, grew through Full-Stack Engineer to Head of Development to CTO at Axilaan, and now serve as Senior Full-Stack & Blockchain Engineer at Relymer.
I ship end-to-end across React & Next.js, Node.js + MongoDB or PostgreSQL, Solidity smart contracts, and AI agents — with the same production rigor whether it's a SaaS dashboard or a token launchpad. 50+ projects, 25+ clients, zero exploited contracts.
AI agent backends with Claude 4.7 tool use, multi-tenant SaaS on Next.js 14, and audit-ready Solidity for token launches. Writing about each in the blog.
@ Relymer Group
@ Relymer Group
@ Relymer Group · Axilaan
@ Upwork · Fiverr
6 roles, 6 years. Scroll horizontally to walk through the journey — newest first.
The tech stack is in the About section. These are the senior-engineering practices that compound over years and separate hire-once from hire-again.
I design systems that survive scale — from database schema and caching layers to API contracts and queue/worker patterns. Trade-offs are explicit, not implicit.
Code that ships to mainnet and to real users. Security checklist for every Solidity contract, observability built-in for every Node service, runbooks for the team.
Cut deployment time by 50% on one team. Dropped MongoDB Atlas bills by 60% via index audits. Performance work that maps to dollars, not benchmarks.
End-of-day Slack updates without being asked, written status > short messages, decisions in writing. Time-zone-friendly across PKT, EU, and US clients.
Senior-level reviews that explain the why, not just the what. Mentored mid-level engineers into senior roles. Code review as teaching, not gatekeeping.
Honest milestone-based estimates with a built-in 1.5x buffer. Ship under estimate more than over. Reputation built on under-promise, over-deliver.
Pre-mainnet checklists, pre-launch QA, post-deploy monitoring. The boring engineering hygiene that prevents 80% of incidents.
Read other engineers' code to learn, audit Solidity contracts for security, review architecture decisions across multiple stacks. Critical sense, not destructive.
A selection of 32+ production projects across Web3, MERN, and full-stack engineering. Token launchpads, SaaS dashboards, NFT marketplaces, and more.
Solar Systems Installation, Maintenance, Net-Metering Services
A modern light-UI NFT minting dashboard built. Targets Base Sepolia.
Dapp, in this app you can faucet token then stake and earn daiy reward
IT Services, Software Development, Web Development, Mobile App Development
Presale, Swap, add Liquidity Launchpad UI with admin panel to fianalize presale
Moving Company in USA Services multi pages Website
Professional Videos editor portfolio website
Want to see something specific or discuss a project?
Get in touchA few words from the people I've shipped with — clients, managers, teammates across the years.
Hassan is an exceptional developer who delivered our project ahead of schedule. His attention to detail and problem-solving skills are truly impressive. The final product exceeded all our expectations.
“I am pleased to recommend Hassan for his exceptional proficiency in React JS, React Native, and Next JS. Hassan collaborated with me on designing and developing my website, delivering remarkable results. His technical skills, attention to detail, and dedication were evident throughout.”
“Hassan is a very good programmer and he is a hardworking person. He makes sure all the deadlines meet and gave the best quality. Highly recommended.”
“Hassan is an excellent resource, and a master at embedded programming. He makes sure all the deadlines meet and that also with the highest standards. He is a hardworking and dedicated person. I would recommend and endorse Hassan.”
“You are a gem of #RelymerGroups — you always do your best and a problem solver. Keep it up with the same motivation.”
“Hassan consistently demonstrated a strong work ethic and a drive for excellence. Always eager to take on new challenges and go the extra mile to deliver high-quality work within tight deadlines. Attention to detail and precision in coding is truly exceptional.”
“I have had the privilege of working closely with Hassan as a full stack developer, and I am consistently impressed by his exceptional skills and dedication. His collaborative spirit and willingness to share knowledge have made him a valuable part of our team.”
“It was a great pleasure working with Hassan. He is not only a nice colleague but also an exceptional team leader — humble, dedicated, and a fantastic team player. His commitment and creativity brought joy to our projects.”
Practical write-ups across Web3, React, Next.js, Node.js, MongoDB, and AI automation — distilled from real production work for clients.
When Server Actions are enough, when you need a WebSocket layer, and how to wire Pusher / Soketi / Ably into a Next.js 14 App Router project without breaking SSR.
The 6 generic patterns I use weekly on React + Next.js codebases — typed hooks, polymorphic components, discriminated unions, infer, constraints — without the academic noise.
After shipping auth on 10+ Next.js projects, here's how I decide between NextAuth (Auth.js), Clerk, and custom JWT — with the gotchas each path hides.
After shipping SaaS apps on both Postgres and MongoDB, here's the decision tree I actually use — schema flexibility, JSONB, indexing, costs, and migration pain.
Compared on real client projects: BullMQ vs Trigger.dev vs Inngest for Node.js background jobs. What I pick for what, with cost, DX, and operational trade-offs.
When to use Server Components vs Client Components in Next.js 14, the patterns that survive production, and the foot-guns I keep tripping over after shipping 8+ App Router projects.
Anthropic Academy · Learn how to use Claude Code effectively in your daily development workflow.
Anthropic Academy · Practical walkthrough of using Claude Code to accelerate your development workflow
Coursera · Blockchain fundamentals & distributed systems
Have a project in mind or want to collaborate? Reach out through any channel below.