Hello, I'm Mrimmoy H Shimanto. I'm a full-stack software engineer specializing in blockchain and AI - GraphQL APIs, on-chain data, cross-chain DeFi, and AI agents - previously at Hgraph.

About me

I'm a blockchain engineer, most recently at Hgraph, where I worked across the full stack of web3 infrastructure - from data indexing and analytics pipelines on the Hedera network and beyond, to the dApps and developer tooling that sit on top of them. My day-to-day spanned designing GraphQL APIs over indexed chain data, building production-grade backends, and shipping responsive frontends that make on-chain data legible to end users. I'm currently open to new roles.

Before Hgraph I worked across several remote teams on NFT marketplaces, payment platforms, and full-stack web applications, which gave me a product-minded engineering perspective: I care about reliability, clean APIs, and developer experience as much as features. I'm comfortable across TypeScript, Next.js, NestJS, Node.js, GraphQL, PostgreSQL, the Hedera SDKs, and EVM tooling (Solidity, Wagmi/Viem, ethers), with cross-chain experience spanning Ethereum, Solana, and bridge protocols such as LayerZero. I'm equally happy debugging an indexer, scoping a new service, or pairing on a frontend.

Outside of work I read philosophy and Islamic texts, teach Arabic, and spend time with my daughter.

My projects

x402 Agent Data Marketplace

An autonomous AI agent that buys data per-request over the x402 payment standard, settling real micropayments on Hedera within a hard spend budget - every purchase logged on-chain and verifiable on HashScan. Built for the Hedera x402 Bounty.

Hedera
x402
AI Agents
TypeScript
HCS

Hedera Node on n8n

A community node bringing Hedera services into the no-code/low-code automation platform n8n.

hedera-sdk
Node.js
n8n
JavaScript

Team contributions

Built alongside a team, not solo projects - included to show the scope of infrastructure I've worked on.

Hedera Stats

Open-source analytics platform for the Hedera network, built with the team at Hgraph. SQL-based metric engine over mirror node data in PostgreSQL, automated with pg_cron and visualized in Grafana: network performance, NFT analytics, account activity, and economic indicators.

PostgreSQL
SQL
Grafana
Mirror Node
GraphQL

Hedera WalletConnect

The library connecting Hedera dApps and wallets over the WalletConnect network, supporting both native Hedera APIs and Ethereum JSON-RPC. Maintained by the team at Hgraph and used by wallets and dApps across the ecosystem.

TypeScript
WalletConnect
Hedera SDK
Reown AppKit

Eta Finance

DeFi platform on Hedera with a DEX aggregator (EtaSwap) and cross-chain bridge (EtaBridge). Contributed across the platform alongside the team: swap routing over SaucerSwap, Pangolin, and Silk Suite liquidity, HTS token support, and bridge integrations.

Hedera
DeFi
HTS
TypeScript
Smart Contracts

My experience

Universal Phoenix Group LLC

New York, US (Remote)

Built applications with Next.js frontends and Node.js backends alongside senior developers at a technology consultancy working with blockchain products.

Nov 2022 - Mar 2024

BBA Graduate, Bangladesh University of Professionals

Dhaka, Bangladesh

BBA specializing in technology management. Pivoted into web development, web3, and AI.

2024

GoMint

UK-Based Remote

Built PWAs, NFT marketplaces, and dApps integrated with Hedera wallets. Frontend lead with backend contributions.

2024 - 2025

Software Engineer, Hgraph

Remote

Built Hedera data infrastructure at Hgraph (hgraph.com): GraphQL APIs over mirror node data, open-source analytics and wallet tooling. Worked with client businesses on on-chain data layers and cross-chain asset solutions.

Dec 2025 - Jul 2026

Contact me

Please contact me directly at mrimmoys@gmail.com or through this form.