// Full Stack Software Engineer
Mohaiminul
Islam Eraj.
Building scalable systems & high-performance backends
5+ years crafting production-grade web applications — from real-time WebSocket systems and microservice architectures to accounting SaaS and healthcare platforms. Currently at Digiground, Australia (remote).
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About Me
Architect of
Digital Experiences
I'm a Full Stack Software Engineer with deep roots in backend systems. I specialize in building the invisible infrastructure that makes products work at scale — from complex API design and database optimization to real-time communication and cloud deployment.
Currently building at Digiground, Australia (remote). Previously at Neoscoder (Akij Venture Group), and Anchorblock Technology where I shipped AnchorBooks — a multi-tenant accounting SaaS serving real users.
Based in Dhaka, Bangladesh, open to global remote opportunities. CS major from Independent University, Bangladesh (2022).
Core Stack
Node.js
NestJS
TypeScript
React
Next.js
PostgreSQL
Redis
Docker
AWS
Kafka
WebSockets
Open to opportunities
Technical Skills
What I Build With
Backend
Node.js · NestJS · TypeScript
Express.js · REST APIs · GraphQL
Microservices · Kafka · RabbitMQ
Express.js · REST APIs · GraphQL
Microservices · Kafka · RabbitMQ
Frontend
React.js · Next.js · SvelteKit
TailwindCSS · Redux · Zustand
HTML5 · CSS3 · WebSockets
TailwindCSS · Redux · Zustand
HTML5 · CSS3 · WebSockets
Databases
PostgreSQL · MySQL · MongoDB
Redis · InfluxDB · Sequelize
Schema design · Query optimization
Redis · InfluxDB · Sequelize
Schema design · Query optimization
Cloud & DevOps
AWS · Docker · Kubernetes (K3S)
GitHub Actions CI/CD · Nginx
Pulumi IaC · PM2 · VPC Peering
GitHub Actions CI/CD · Nginx
Pulumi IaC · PM2 · VPC Peering
Blockchain
Ethereum · Solidity · Hardhat
Hyperledger Fabric & Besu
IPFS · Smart Contracts · EVM
Hyperledger Fabric & Besu
IPFS · Smart Contracts · EVM
Testing & Tools
Jest · Mocha · TDD
Git · Linux · Agile / SDLC
Arduino · Raspberry Pi · ESP8266
Git · Linux · Agile / SDLC
Arduino · Raspberry Pi · ESP8266
Work History
Where I've Worked
Full Stack Engineer · Remote
- Developed responsive UI components using React and Next.js, improving application usability
- Optimized page load performance through efficient rendering and data fetching strategies
- Designed backend APIs and async workflows supporting real-world product use cases
- Worked cross-functionally with product, design, and support in a remote-first environment
Senior Software Engineer (Backend Focused)
- Owned backend services end-to-end: design, deployment, and production monitoring
- Optimized database queries and indexing strategies for high-load API performance
- Implemented Redis caching and background processing to improve throughput
- Improved CI/CD pipelines and deployment workflows on AWS
- Mentored engineers and conducted architecture discussions on scalability and reliability
Software Engineer · Full Stack & Blockchain
- Built and maintained the AnchorBooks SaaS accounting platform (anchorbooks.ai) with OCR, recurring billing, and PDF generation
- Implemented RBAC access control, JWT authentication, and data security protocols across services
- Deployed backend infrastructure with Docker on AWS using GitHub Actions CI/CD
- Built an LMS platform with AI chat integration, video processing (ffmpeg), and RabbitMQ queuing
- Designed and deployed a CBDC smart contract (Central Bank Digital Currency / CEX protocol) with on-chain data retrieval subgraphs
- Built a DEX Protocol enabling token trading, order creation, cancellation and filling on-chain
- Developed Blockchain Bridges for seamless token transfers between distinct blockchain networks
- Led frontend & backend for a Hyperledger Grid supply chain prototype using Fabric and Besu
- Implemented private multi-node blockchain networks with smart contract deployment pipelines
- Built subgraph data pipelines with GraphQL and Docker for efficient on-chain data indexing
Junior Blockchain Engineer
- Deployed multi-signature crypto wallet (MontyPy) on Polygon Mainnet in Solidity
- Built and launched Indicium NFT Marketplace end-to-end; integrated MetaMask, Coinbase & WalletConnect
- Wrote smart contracts across ERC20, ERC721, and ERC1155 standards; deployed a contract on Solana
- Indexed and queried blockchain data using GraphQL subgraph API, persisting results to PostgreSQL via Docker
- Researched DeFi lending protocols (Uniswap, Aave) and financial derivatives including power perpetual models
- Built an Ethereum Faucet site and an Etherscan-style block explorer using Ethers.js
Junior Software Engineer · Remote
- Built web applications using the MERN stack with Next.js SSR optimization
- Developed a POS desktop application with Electron.js
- Contributed to React Native mobile application features
Selected Work
Projects I've Built
⚙ Full Stack & Backend
AnchorBooks — Accounting SaaS
Multi-tenant bookkeeping platform handling invoices, bills, recurring billing, financial reports,
and PDF generation. Implemented OCR via Tesseract.js for automated document parsing and
integrated open API gateways for invoice/customer management.
NestJSReact
PostgreSQLRedis
AWSDocker
Tesseract.js
LMS with AI Integration
Video-based learning management subscription platform with integrated AI chat assistant.
Handled video processing pipelines with ffmpeg, async job queuing via RabbitMQ,
and scalable deployment on AWS with Nginx reverse proxy.
NestJSReact
PostgreSQLMongoDB
RabbitMQffmpeg
AWS
HRMS — HR Management System
Enterprise HR platform with split leave management, promotion and increment request workflows,
payroll management, and RESTful API architecture. Enforced strict data security
and role-based access control throughout.
NestJSReact
MySQLRedux
DockerAWS
CI/CD
Indicium — NFT Marketplace
Full-stack NFT marketplace enabling users to discover, mint, and trade digital collectibles.
Integrated MetaMask, Coinbase, and WalletConnect. Built smart contracts in Solidity,
deployed on Polygon Mainnet, with GraphQL blockchain data querying.
SolidityMERN Stack
GraphQLPostgreSQL
Ethers.jsTruffle
Polygon
CareForYou — Healthcare Platform
Healthcare platform enabling real-time patient-doctor interaction, expert content verification
to prevent medical misinformation, and specialist consultation booking. Built with Socket.io
for live chat features.
Node.jsReact
Next.jsMongoDB
Socket.ioRedux
bKash Remote Debug Tool
Desktop application built with Electron.js to remotely debug the Android bKash fintech app
on customer devices — reducing field support time and enabling engineers to diagnose
production issues without physical device access.
Electron.jsNode.js
HTMLCSS
Android Debug Bridge
⛓ Blockchain & Web3
CBDC — Central Bank Digital Currency
Wrote and deployed smart contract implementation for a Central Bank Digital Currency protocol
(CEX protocol). Implemented on-chain data retrieval subgraphs for efficient state querying,
enabling auditable, transparent monetary operations on a permissioned chain.
SolidityHardhat
GraphQL SubgraphEthereum
DockerHyperledger
DEX Protocol — Decentralized Exchange
On-chain decentralized token exchange where users can trade ERC-20 tokens, create limit orders,
cancel and fill orders — all enforced by smart contracts. Includes a React trading dashboard
with real-time WebSocket order data, PnL tracking, and terminal CLI responsiveness.
SolidityReact
Ethers.jsWebSockets
HardhatERC-20
SCM Prototype — Blockchain Supply Chain
Multi-platform blockchain supply chain management prototype built across Hyperledger Fabric,
Hyperledger Besu, and Hyperledger Grid. Implemented private multi-node network architecture,
chaincode deployment, and a full-stack management UI for tracking goods end-to-end.
Hyperledger FabricHyperledger Besu
Hyperledger GridNode.js
ReactDocker
POLYGON MAINNET ✓
MontyPy — MultiSig Shared Wallet
A shared on-chain treasury wallet built on an M-of-N signature scheme
— N owners are registered at deploy time, and any inbound transaction requires at least M of them to
approve before the funds move. Any owner can propose a transaction; the contract stores it
in a pending queue on-chain. Co-owners then independently sign via MetaMask,
and once the approval threshold is met the contract auto-executes — no trusted third party,
no single point of failure. Eliminates the risk of a single compromised key draining the wallet,
making it ideal for team treasuries, DAOs, and joint crypto payment flows.
Deployed live to Polygon Mainnet for production-grade,
low-fee EVM transactions.
SolidityPolygon Mainnet
MetaMaskHardhat
Ethers.jsReact
EVM
FAQ
Common Questions
01 What is Mohaiminul's primary technology stack?
His core stack centers on Node.js, NestJS, and TypeScript for backend development,
paired with React and Next.js on the frontend. For data, he works primarily with
PostgreSQL, MongoDB, and Redis, and deploys on AWS using Docker and CI/CD pipelines
via GitHub Actions.
02 Is he available for remote work with international teams?
Yes. He is based in Dhaka, Bangladesh (GMT+6) and currently works full-time remote
for a team in Australia. He's open to full-time, contract, or freelance Full Stack,
Backend, or Blockchain Engineering roles with teams anywhere in the world.
03 Does he have professional blockchain and Web3 experience?
Yes — over three years building production blockchain systems, including Solidity
smart contracts on Ethereum and Polygon Mainnet, NFT marketplaces, a decentralized
exchange (DEX), multi-signature wallets, and Hyperledger Fabric/Besu supply chain
networks.
04 How many years of professional experience does he have?
5+ years across four companies, progressing from Junior Software Engineer to
Senior Software Engineer (Backend Focused), with hands-on experience in both
startup and enterprise environments.
05 What kinds of projects has he built?
Production SaaS platforms including an accounting and bookkeeping system used by
real businesses, an AI-integrated learning management system, an HR management
system, healthcare platforms with real-time features, and multiple blockchain
projects including NFT marketplaces and DeFi-adjacent protocols.
06 What's the best way to get in touch about an opportunity?
The fastest way is email at eraj471@gmail.com, or connect via LinkedIn and GitHub —
both linked in the contact section below.
Contact
Let's build something remarkable.
Open to senior backend, full-stack, and remote engineering roles globally. Always happy to discuss interesting technical challenges.