Abdullah Khalid

Full-Stack TypeScript Engineer

khalid.code03@gmail.comDhaka, Bangladesh (Remote)github.com/khalids01linkedin.com/in/khalid87

Summary

Full-stack TypeScript engineer who owns applications and complex product workflows from requirements and technical decisions through deployment and production support. Experienced in system design, application architecture, API development, data modeling, third-party integrations, and real-time processing. Builds complete solutions across React and Next.js interfaces, TypeScript backend services, databases, and cloud infrastructure.

Technical Skills

CoreTypeScript, JavaScript, System Design, Clean Architecture

ApplicationsReact, Next.js, Node.js, Bun, Fastify, NestJS, Elysia.js

Data & RealtimePostgreSQL, MariaDB, Redis, Prisma, WebSockets

DeliveryAWS, Docker, CI/CD, Linux, Grafana

AI IntegrationLLM APIs, Streaming Responses, Structured Outputs

Experience

Interspeed

Jun 2023 — Present

Full-Stack TypeScript Developer · Remote

Led delivery of an enterprise Laboratory Information Management System over 2.5 years, personally handling requirements discussions, technical decisions, implementation, deployment, and production support.
Delivered patient and sample workflows, clinical and anatomical laboratory processes, dynamic forms, and reporting across Next.js interfaces, Fastify APIs, and MariaDB models.
Implemented role-based access control across laboratory interfaces and backend services to support different operational responsibilities.
Built real-time crypto market-data pipelines and processing with Bun, Elysia.js, Redis, and WebSockets, including opportunity detection, fee-aware checks, and persistent trade lifecycle tracking.
Built and maintained production infrastructure with AWS, Docker, Linux, CI/CD, Grafana, and cloud-hosted databases; contributed frontend and REST API improvements to an OpenEMR fork.

Freelance / Contract

2020 — Feb 2023

Web Designer & Web Developer · Remote

Delivered client ecommerce work across storefronts, product and order workflows, dashboards, and integrations, handling requirements, revisions, deployment, and maintenance.
Built responsive business websites and interfaces with JavaScript, React, Next.js, and Node.js, progressing from web design into full-stack development.
Delivered 100+ website designs as part of a remote web-design team after an initial Fiverr engagement became longer-term direct work.

Selected Projects

Laboratory Information Management System (LIMS)

Private enterprise HealthTech platform for hospitals and diagnostic laboratories.

Translated clinical and anatomical laboratory requirements into patient and sample workflows, dynamic forms, reporting, and operational automation.
Made technical decisions across Next.js, Fastify, TypeScript, and MariaDB, and handled deployment and ongoing production support.

Ecommerce Applications

Production commerce systems for client and business-owned retail workflows.

Built storefront, product, order, dashboard, payment, and third-party integration workflows used for real customer purchases.
Handled responsive interfaces, business requirements, revisions, deployment, and ongoing maintenance.

Algorithmic Crypto Trading Platform

R&D platform for real-time market intelligence, arbitrage research, strategy validation, and automated execution architecture.

Built real-time market-data ingestion and Redis-backed processing across centralized exchanges and Solana liquidity venues.
Implemented cross-exchange opportunity detection, fee-aware profitability calculations, slippage and liquidity checks, simulation workflows, and trade lifecycle tracking.

Education

Diploma in Computer Science & Engineering

Tangail Polytechnic Institute

Languages

English: Professional Working Proficiency · Bangla: Native