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Abdullah Khalid
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Full-Stack TypeScript Developer

Results-driven Full-Stack TypeScript Developer specializing in building scalable SaaS, HealthTech, and FinTech platforms. Experienced in architecting microservices, designing real-time data pipelines, and developing secure, production-grade systems. Strong background in crypto arbitrage engines, WebSocket-based market data ingestion, and cloud-native infrastructure.

Dhaka, Bangladesh
khalid.code03@gmail.com
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Skills & Expertise

A comprehensive toolkit for building modern, scalable applications

Languages

TypeScript
TypeScript
JavaScript
JavaScript
PHP
PHP
Elixir
Elixir

Frontend

React
React
React Native
React Native
Next.js
Next.js
SvelteKit
SvelteKit

Backend

Node.js
Node.js
Bun
Bun
Elysia.js
Elysia.js
Fastify
Fastify
NestJS
NestJS
Express.js
Express.js
Phoenix
Phoenix

Database & ORM

Prisma
Prisma
Drizzle
Drizzle
TypeORM
TypeORM
Mongoose
Mongoose
PostgreSQL
PostgreSQL
MySQL
MySQL
MariaDB
MariaDB
MongoDB
MongoDB
Redis
Redis

DevOps & Cloud

AWS (RDS, ElastiCache, S3, EC2)
AWS (RDS, ElastiCache, S3, EC2)
Docker & Docker Compose
Docker & Docker Compose
Linux Server Ops
Linux Server Ops
Grafana
Grafana
CI/CD
CI/CD

FinTech / Blockchain

Web3.js
Web3.js
Solana RPC / Anchor
Solana RPC / Anchor
Jupiter DEX Aggregator
Jupiter DEX Aggregator
Binance API
Binance API
KuCoin API
KuCoin API
Coinbase API
Coinbase API

Other

System Design
System Design
Clean Architecture
Clean Architecture
Performance Optimization
Performance Optimization
API Security
API Security
Journey

Work History

A chronology of my professional experience, building scalable solutions across the stack.

Jan 2023 — Present

Full-Stack TypeScript Developer

Interspeed
Remote
Contributing to OrangeSphere (21s2mars), a production-grade crypto arbitrage and analytics platform, and Sofilite, a Laboratory Information Management System (LIMS) and EMR platform.
Engineered a TypeScript-first trading engine using Bun and Elysia.js, processing live market data from Binance, KuCoin, Coinbase, and Solana DEXs (Jupiter / Anchor).
Built an automated cross-exchange arbitrage engine using Redis pub/sub and WebSocket streams, scanning live order books for micro-arbitrage opportunities.
Implemented execution logic accounting for fees, slippage, and latency, enabling autonomous small-volume trades under strict thresholds.
Integrated Grafana dashboards powered by AWS Athena for real-time monitoring and historical analytics.
Developed Sofilite LIMS with a multi-role architecture and dynamic form generation using Next.js, Fastify, and MariaDB.
Contributed to modernizing a large legacy EMR codebase (OpenEMR fork), improving clinician and patient workflows.
Jan 2020 — Jan 2023

Full-Stack Web Developer

Freelance / Contract
Remote
Delivered end-to-end web, SaaS, and e-commerce solutions for clients in tech and retail.
Completed 100+ client projects with consistent 5-star ratings.
Built custom CMS dashboards and multi-vendor e-commerce platforms using Next.js and NestJS.
Integrated payment gateways and third-party APIs.
Deployed and maintained applications on AWS and Vercel.

Featured Projects

A selection of projects that showcase my skills and experience

TypeScriptBunFastifyPostgreSQLRedisWeb3DEX

Algorithmic Crypto Trading Platform

A non-custodial algorithmic trading platform supporting automated and manual swaps across centralized and decentralized exchanges with real-time arbitrage detection.

TypeScript•React•Bun•Elysia.js•+16 more
TypeScriptFastifyNext.jsMariaDBAI

Laboratory Information Management System (LIMS)

A full-featured LIMS for hospitals and diagnostic centers, supporting complete Anatomical and Clinical workflows with strict access control and automation.

TypeScript•React•Next.js•Node.js•+7 more
TypeScriptPHPReactMySQLREST

Electronic Medical Record (EMR)

Modernized legacy modules of a 20+ year open-source EMR, improving clinician and patient experience with new UI and APIs.

TypeScript•JavaScript•PHP•React•+3 more

Services

What I can help you build

Web Development

Building responsive, performant web applications using modern frameworks like React, Next.js, and Vue.js.

  • ✓Single Page Applications
  • ✓Progressive Web Apps
  • ✓Server-Side Rendering

Mobile Development

Creating cross-platform mobile applications with React Native and Flutter for iOS and Android.

  • ✓Cross-Platform Apps
  • ✓Native Performance
  • ✓Push Notifications

Backend Development

Designing and implementing scalable backend systems with Node.js, Express, and modern databases.

  • ✓RESTful APIs
  • ✓GraphQL
  • ✓Microservices

Cloud Solutions

Deploying and managing applications on cloud platforms like AWS, Google Cloud, and Azure.

  • ✓CI/CD Pipelines
  • ✓Auto Scaling
  • ✓Monitoring

UI/UX Design

Crafting beautiful, intuitive user interfaces with attention to detail and user experience.

  • ✓Responsive Design
  • ✓Design Systems
  • ✓Prototyping

Performance Optimization

Analyzing and optimizing application performance for faster load times and better user experience.

  • ✓Code Splitting
  • ✓Lazy Loading
  • ✓SEO Optimization