SaaS & business applications
Product dashboards, portals, internal tools, authentication, payments, APIs, and dependable data workflows.
Discuss this service ↗Available for remote roles & focused projects
Senior Full-Stack & Product EngineerSaaS × Product Engineering × Commerce
From complex ideasto reliable products.
I build reliable SaaS platforms, business applications, and high-converting commerce experiences—from product interfaces and APIs to integrations and deployment.
8+Years building
for production
for production
100+Projects
delivered
delivered
5International &
remote teams
remote teams
const delivery = {
product: "clear",
architecture: "pragmatic",
experience: "responsive",
production: true
};● available for the right project
PRODUCTReact + Next.js
DELIVERYAPI · Cloud · CI/CD
Shopify
WordPress
REACT✦NEXT.JS✦NESTJS✦PYTHON✦FASTAPI✦PHP✦LARAVEL✦POSTGRESQL✦AWS✦SHOPIFY✦WORDPRESS
What I deliver
One partner from idea
to production.
Focused engineering for businesses that need a capable product builder—not layers of handoffs.
Full-stack & backend engineering
React and Next.js products backed by NestJS, FastAPI, PostgreSQL, and MongoDB—with secure APIs, authentication, webhooks, and scalable data workflows.
Discuss this service ↗Shopify & WordPress
Custom Shopify storefronts, Liquid sections, and WordPress experiences with WooCommerce, Elementor, custom themes, integrations, and conversion-focused improvements.
Discuss this service ↗Production client work
Built for real products,
brands, and users.
Selected public work from international SaaS, AI, healthcare, and commerce engagements. Each card states the area I contributed to.
01SaaS · Norway
PropCloud Platform
Property technology experiences spanning a public product website and an application interface built for real operational workflows.
DeliveredFrontend implementation · responsive UI · application workflows
- SvelteKit
- JavaScript
- Python
- Flask
02Hospitality · Dubai
TRPS Vacation Rental Platform
A production booking platform for luxury vacation homes, connecting property discovery, live availability, reservations, payments, and location experiences.
DeliveredBuilt for a ScaleBridger client · Guesty API · Stripe checkout · Mapbox integration
- React
- Guesty API
- Stripe
- Mapbox
- Node.js
- Azure
03Product · AI
Softwrd.ai
A modern product experience for an AI-focused technology company, translating product positioning into a clear and responsive interface.
DeliveredFrontend delivery · component UI · responsive implementation
- SvelteKit
- JavaScript
- Python
- Flask
04Commerce · International
GOOD GOOD®
Shopify delivery for an international consumer brand, including responsive storefront implementation, Liquid components, and commerce UX.
DeliveredShopify theme development · Liquid · storefront UI
- Shopify
- Liquid
- JavaScript
- Commerce UX
Engineering case studies
Depth beyond
the interface.
Projects that demonstrate data processing, visual editing, financial logic, relational modelling, and full-stack delivery.
05Data engineering
Large CSV Import System
A resilient pipeline designed to process 2GB+ CSV files without blocking Node.js, with persisted progress and efficient large-list rendering.
DeliveredStreaming pipeline · background processing · progress tracking
- Node.js
- React
- MongoDB
- Prisma
06Interactive product
Sticker Editor
A production visual editor covering synchronized canvas transformations, die-cut generation, history, image processing, and consistent SVG output.
DeliveredCanvas architecture · complex interaction · export workflows
- React
- TypeScript
- Fabric.js
- SVG
07Fintech
Bond Yield Calculator
Full-stack fixed-income analytics with validated inputs, a numerical YTM solver, cash-flow schedules, and a responsive interface.
DeliveredFinancial logic · REST API · validated product UI
- React
- NestJS
- TypeScript
- REST
08Business software
Accounting Application
Double-entry workflows with chart-of-accounts management, balanced journal validation, and type-safe relational data.
DeliveredFull-stack workflows · relational data · domain validation
- Next.js
- Prisma
- PostgreSQL
- Zod
How I work
Clear progress.
No mystery.
A practical delivery process designed for remote collaboration, visibility, and dependable handover.
- 01
Understand
Clarify the problem, users, scope, risks, and definition of done.
- 02
Plan
Break delivery into visible milestones with pragmatic technical decisions.
- 03
Build
Ship working increments, communicate progress, and test critical flows.
- 04
Launch
Deploy, document, hand over cleanly, and support the next iteration.
Experience
Built across products,
teams, and time zones.
From complex frontend systems to API-backed SaaS features, I work across product requirements, architecture, implementation, and production delivery.
Senior Frontend Engineer
Omnistra (Private) Limited · Remote
AI dashboards, client-portal flows, calculators, reusable interactions, and performance work with React, Next.js, and TypeScript.
Senior Full-Stack Developer · Contract
Scalebridger · Austin, USA · Remote
End-to-end SaaS features spanning authentication, CRM workflows, automation, and integrations with Next.js and NestJS.
Full-Stack Developer · Contract
Woztell · Valencia, Spain · Remote
APIs, webhooks, integrations, and automation for a production conversational platform.
Shopify Theme Developer
Saibbyweb · Remote
Responsive Shopify storefronts, custom Liquid sections, theme components, product-page features, and conversion-focused UI improvements.
Senior Software Engineer
Xpertsolvers · Bangladesh
React/Next.js architecture, NestJS services, PostgreSQL, RBAC, monitoring, integrations, and CI/CD.
Senior Full-Stack Engineer · Contract
Getonnet Sweden AB · Remote
A browser-based sticker editor with synchronized canvas transformations, die-cut paths, history, and SVG export.
Senior Frontend Engineer
Softwrd Ltd · Bangladesh
Enterprise dashboards and analytics interfaces with React, TypeScript, TanStack Query, and FastAPI integrations.
Shopify Theme & App Developer
Aiva Labs Inc · Ontario, Canada · Remote
Custom Shopify themes, reusable Liquid sections, app and API integrations, and responsive commerce experiences.
2017–Present · Freelance Full-Stack Developer100+ production projects through Upwork and Fiverr across SaaS, e-commerce, APIs, Shopify, and WordPress.
Core stack
Broad enough to deliver.
Focused enough to lead.
My strongest work sits at the intersection of complex frontend systems, dependable APIs, and clear product thinking.
01
Frontend
React · Next.js · TypeScript · TanStack Query · Redux Toolkit · Zustand · Tailwind CSS
02
Backend
Node.js · NestJS · Python · FastAPI · PHP · Laravel · REST · GraphQL · WebSockets · OpenAPI · Webhooks
03
Data
PostgreSQL · MySQL · MongoDB · Redis · Prisma · TypeORM · Query optimization
04
Quality
Jest · React Testing Library · Vitest · Cypress · Docker · GitHub Actions · CI/CD
05
Commerce
Shopify · Liquid · WordPress · WooCommerce · ACF · Elementor · Headless CMS
06
Cloud & DevOps
AWS · Azure · GCP · Vercel · Docker · GitHub Actions · Nginx
About
Business context with an engineer's discipline.
I'm Md. Tanjir Mahabub, a senior frontend-focused full-stack engineer based in Chattogram, Bangladesh. I turn complex requirements into maintainable, responsive, and reliable web products.
My background combines international SaaS delivery with 7+ years of WordPress/WooCommerce and 5+ years of Shopify development—from enterprise dashboards and APIs to interactive editors and conversion-focused storefronts.
Clear communicationPragmatic architectureCommerce expertiseProduction ownership
Start a conversation
Have a product to build
or a difficult problem to solve?
Share what you are building, what is currently blocking progress, and your preferred timeline. I'll respond with the clearest next step.