Full-stack engineer · SaaS architect · Solo, no agency

I build secure, multi-tenant SaaS platforms — and I write every line myself.

Independent engineer specializing in Next.js, React and Node.js, with a focus on secure database architecture — Supabase, PostgreSQL and Firebase. I take 100% technical ownership: pixel-perfect frontends from Figma, robust backends underneath.

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Currently taking on new projects

Mahmudul Hossain, full-stack engineer and SaaS architect

In production right now

What I build with

Core technical capabilities

Five areas I own end to end on every engagement — no handoffs, no subcontracting.

Mahmudul Hossain reviewing technical capabilities on a dashboard

High-performance frontend

React, Next.js (App Router), TypeScript, Tailwind CSS, shadcn/ui and Framer Motion — pixel-perfect from Figma.

Robust backend & APIs

Node.js, Express, NestJS, and REST / GraphQL API design built for scale and clean boundaries.

Database & security hardening

PostgreSQL, Supabase with Edge Functions, MongoDB, and strict RLS policies for full multi-tenant isolation.

Advanced integrations

Stripe / Mollie subscriptions & webhooks, Twilio / Resend messaging, and OpenAI / Claude RAG pipelines.

Mobile & web hybrid

Cross-platform, installable Progressive Web Apps built straight from a single Next.js codebase.

AI-native velocity

Cursor IDE and Claude Code accelerate scaffolding and boilerplate — freeing time for business logic and edge cases.

Beyond code

The full growth stack

Development is the foundation — but launch also needs marketing, creative, and infrastructure. I handle the full stack solo.

Digital Marketing

Strategy-first growth plans that connect your product, audience, and channels.

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SEO (Search Engine Optimization)

Technical and content SEO that helps the right people find you on Google.

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Landing Page Development

Fast, conversion-focused pages — coded, deployed, and ready for ads.

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Facebook Ads Management

Meta campaigns built for leads and sales — structured, tracked, and optimized.

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How I build fast

AI-native workflow, not AI-generated output

I use Cursor IDE and Claude Code to scaffold schemas, write migrations and generate UI boilerplate — eliminating manual coding latency. Every feature still gets shipped at production quality, because the saved time goes straight into custom business logic, authorization layers and edge-case testing, not corner-cutting.

Mahmudul Hossain using AI-native development workflow on laptop

policies/tenants_rls.sql

-- row-level security: strict tenant isolation
alter table invoices enable row level security;

create policy "tenant_isolation"
  on invoices
  for all
  using (tenant_id = auth.jwt()->>'tenant_id');

-- deploy status
vercel deploy --prod
✓ build complete (14s)
✓ 0 leaked rows across 2,400+ tenants

build.log

$ scaffold database schema✓Tables, relations and indexes generated from the data model.

$ generate migrations✓Versioned, reversible migrations ready for staging.

$ harden rls policies✓Manual pass: tenant isolation, auth edge cases, abuse limits.

$ ship production feature✓Deployed at roughly 2x standard market speed.

Shipped, not mocked up

Production projects

Five platforms I designed, built and deployed solo — from schema to UI to launch.

Mahmudul Hossain presenting production SaaS projects

socialmediacaring.com/bariowala

Property Management SaaS

Bariwala Pro

Multi-tenant B2B workspace management with automated utility billing ledgers and role-based access, isolated with PostgreSQL RLS.

Next.jsPostgreSQL RLSMulti-tenant

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tidewayshipping.com

Tide Way Shipping maritime logistics dashboard on multiple screens

Maritime Logistics Platform

Tide Way Shipping OPC

Maritime logistics website with an instant freight rate estimator, plus a custom SVG vessel tracking map with simulated fleet movement in a role-based operations demo — responsive Tailwind UI.

SVG vessel mapRate estimatorTailwind

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proactivesecuritybd.com

Proactive Security BD

Brand Identity + Corporate Platform

Proactive Security Services BD

End-to-end digital branding and a responsive React / Node.js platform integrated with secure request-for-quote workflows.

Brand identityReact / Node.jsRFQ workflow

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socialmediacaring.com

4-Portal Installable PWA

School Management ERP

Four secure, isolated role-based portals — Admin, Teacher, Parent, Student — built on Firebase Custom Claims and Firestore Security Rules.

FirebaseCustom claimsInstallable PWA

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private client build

B2B Quote & Lead-Gen Portal

Lead-Generation Portal

B2B Quote & Lead-Generation Portal

An interactive, multi-step lead-capture wizard with dynamic question routing that validates client metrics and securely saves qualified leads.

Multi-step wizardDynamic routingLead capture

Private build — demo on request

From the build log

Notes on shipping SaaS

Practical writing on engineering, growth, and the stack I use to ship client work — no fluff, no content-mill filler.

Oct 14, 20267 min read

Shipping Management Software Case Study: Vessel Tracking Map & Portals

How I built shipping management software with a vessel tracking map, role-based portals, container tracking and instant freight quotes: a case study.

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Mar 1, 20264 min read

What a Client Should Ask Before Hiring a 'Full-Stack Freelancer'

Most hiring guides protect agencies. This one protects you — the client — with the technical questions that reveal whether a solo engineer can actually own your product.

Freelancing Client Guide SaaS

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Feb 10, 20264 min read

Next.js App Router vs Pages Router: What I Actually Use in Production

The App Router is not a religion. Here is how I choose between App Router and Pages Router on real client projects — and what I default to in 2026.

Next.js React Architecture

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Watch it happen

Workflow showcase

A short look at how I write code, connect databases, and deploy secure Next.js applications on Vercel and Cloudflare in real time.

Mahmudul Hossain demonstrating workflow and deployment process

1-minute walkthrough

How I write, connect and deploy — live

A short, unedited look at how I write code, manage database connections, and deploy secure Next.js applications on Vercel and Cloudflare in real time.

About

Solo by choice, not by limitation

I'm Mahmudul Hossain, an independent full-stack engineer and SaaS architect. I don't run an agency, and I don't outsource — every line of code across every project above was written by me.

That means no handoffs between a designer, a backend developer and a project manager who has never opened the codebase. You brief one person, and that person owns the architecture, the database security, and the pixel-perfect frontend, from the first migration to the production deploy.

I'm looking to become a reliable, long-term technical partner — not a one-off contractor. If that sounds like what your project needs, let's talk.

100%

Self-written code

Build speed, AI-native

Production SaaS platforms