Background

Where I've worked, what I've done, and what I know.

Resume

Software Engineer L3

Dynamic Solution Innovators Ltd.

Jul 2023 – Present
  • •Led a team of 5 to ship a large-scale B2B product for US banks & credit unions — campaign management, direct mail design, offer management, landing pages, surveys, analytics, with Email & SMS targeting.
  • •Redesigned a message queue-based Express.js + Spring Boot service: cut image generation time by 75%, RAM by 62.5%, CPU by 66.67% — processing 1.2M images/day on a single server.
  • •Engineered an OAuth-based API Gateway (Spring Cloud Gateway) supporting 100+ microservices and 10M+ requests/day using Virtual Threads.
  • •Built an Audience Upload pipeline with Spring Batch to process 1M+ records efficiently.
  • •Delivered a subscription-based expense management platform integrating with Xero — OTP auth, OCR/OpenAI receipt extraction, approval workflows, draft invoice generation, and compliance change logs.
  • •Automated deployment of 10+ microservices via Docker and GitLab CI/CD pipelines.
JavaSpring BootSpring CloudNode.jsReactMongoDBPostgreSQLDockerAWSXero APIOpenAI

Full Stack Developer & AI Consultant

Upwork (Freelance)

Sep 2023 – Present

Top Rated · 100% Job Success · $6K+ earned · 9 jobs · 5.0 avg rating

  • •Delivered 9 client projects across backend, frontend, and full-stack — earning 100% Job Success and Top Rated status.
  • •Built long-term relationships with repeat clients, with 5 projects for a single UK-based client totaling $4,800+.
  • •Also run a Development & IT Consultation service — 7 sessions, all 5-star rated — covering architecture reviews, tech stack selection, system design, and project feasibility.
Node.jsExpress.jsNestJSReactSpring BootPostgreSQLREST APIs

Backend Cleanup & Long-term Development

UK-based SaaS Client (repeat)

$3,8805

Year-long engagement including backend architecture cleanup, feature development, and ongoing maintenance across multiple services.

“Great work, attention to detail, would highly recommend.”

Node.jsExpress.jsNestJSREST APIs
Mar 2024 – Mar 2025

Full-Stack API Integration

International Client

$8005

Currently building full-stack features with multiple third-party API integrations.

Full StackAPI Integration
Mar 2025 – Present

Spring Boot + React + PostgreSQL Website

International Client

$4005

End-to-end development and deployment of a full-stack web application.

Spring BootReactPostgreSQL
May 2024 – May 2025

HIPAA-Compliant React Application

Healthcare Client

$1000+5

Senior React + Spring Boot development for a HIPAA-compliant healthcare platform — 21 hours of hourly work.

ReactSpring BootJavaHIPAA
Feb 2024 – May 2024

Node.js RESTful API Development

UK-based Client (repeat)

$500+5

Designed and built high-performance RESTful APIs with Node.js and Express.js for integration with a Next.js frontend. Two separate contracts.

“Great work provided, I would highly recommend Mehedi.”

Node.jsExpress.jsREST APIsNext.js
Dec 2023 – Mar 2024

NestJS Backend Service

UK-based Client (repeat)

$450+5

Rapid delivery of a NestJS backend service for an existing product.

“Great work as usual.”

NestJSNode.jsTypeScript
Jan 2024

REST API & React Integration

Japan-based Client

$5505

Built REST APIs with Node.js, Express, and Mongoose for a Next.js admin panel with 6 resource types. Deployed on Render.com. Separate contract for React frontend API integration.

“Very well done, definitely will hire again. Fast response as well as good understanding of development in general.”

Node.jsExpress.jsMongooseReactNext.js
Sep 2023 – Nov 2023

Software Engineer L1

Dynamic Solution Innovators Ltd.

Sep 2021 – Jun 2023
  • •Built scalable RESTful APIs with Spring Boot and Express.js; optimized MongoDB and PostgreSQL queries, reducing data fetch time by 30%.
  • •Built a custom React.js drag-and-drop editor using Context API, Redux, and TanStack Query for the B2B banking product.
  • •Developed a Python-based CV/resume parser with 80% prediction accuracy for an ATS system.
  • •Dockerized multiple services and automated deployments via Ansible & Jenkins CI/CD pipelines.
  • •Integrated report generation (PDF, XLSX) with Java iText — reduced HR workload by 20–30%.
Spring BootExpress.jsReact.jsPythonMongoDBPostgreSQLDockerJenkins

Software Engineer (Part-time)

Logiqbits (Startup)

Jun 2020 – Sep 2021
  • •Built the MyBebsha mobile (Android) application from scratch using Flutter for mybebsha platform, onboarding 1000+ sellers. It is a seller e-com application to digitalise their shop.
  • •Implemented design from Figma, work on push notifications with Firebase and used Bloc as well as Cubits for state management while following bloc pattern architecture.
  • •Responsible for managing app testing and release in Google Play Console.
  • •Built RESTful APIs with Express.js — JWT auth, role-based access, and file uploads for a headless CMS.
  • •Implemented a module-based permission system for granular access control in a SaaS blog platform.
FlutterDartExpress.jsNode.jsJWTMongoDB

Skills & Familiarity

JavaSpring BootSpring CloudNode.jsExpress.jsNext.jsReactTypeScriptJavaScriptPythonFlutterMongoDBPostgreSQLDockerCI/CDAWSDigitalOceanLangChainRAGN8NSystem DesignMicroservices

B.Sc. in Software Engineering — Shahjalal University of Science and Technology, Sylhet. Graduated 2023. CGPA 3.39.