Hi, I'm Rayhan. A Senior Backend Engineer and SaaS Architect

Building backend infrastructure that scales — for startups and enterprise clients worldwide.

I architect backend systems that businesses can depend on, from multi-tenant SaaS platforms and custom ERP solutions to payment infrastructure and AI-powered automation. I've contributed to 10+ commercial products used by 8,700+ businesses globally. When your tech needs to work harder, that's where I come in.

Let's Work Together ->
Elias
Currently working with International Clients

#projects

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School Express
CodeigniterPHPMySQL
#saas #erp #education
School Express

Comprehensive school management system streamlining daily operations from admission and fee col...

FoodKing
LaravelPHPFlutterMySQL
#saas #restaurant #pos
FoodKing

Single and multi-branch restaurant food delivery system with admin panel, Flutter delivery man ...

ShopKing
LaravelPHPFlutterMySQL
#ecommerce #pos #saas
ShopKing

Single vendor eCommerce platform with Flutter mobile app, Laravel admin panel, full POS system ...

iTest
PHPLaravelMySQL
#saas #education #examination
iTest

Online quiz and examination system for educational institutions with question banks, bulk impor...

#about-me

I'm Rayhan Abdullah — a Senior Software Engineer and Engineering Lead based in Dhaka, Bangladesh.

For 4+ years I worked at iNiLabs, one of Envato's most active SaaS product studios. I contributed to 10+ commercial software products that collectively reached 8,700+ sales and 4.31 stars from 600+ verified global buyers.

The products I worked on are deployed in real businesses worldwide — a school management system running in 2,300+ institutions, a restaurant delivery platform used by 1,000+ outlets, hospital ERPs, eCommerce POS systems, and hostel management tools.

Read more ->

#skills

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Languages
PHP JavaScript TypeScript Python C
Frameworks
Laravel Codeigniter InertiaJS ReactJS VueJS ExpressJS AlpineJS NuxtJS NodeJS
Databases
MySQL PostgreSQL MongoDB SQLite Redis Firebase
DevOps & Tools
Git GitHub_Actions CI/CD Docker Laradock Linux Apache Nginx Postman NPM Yarn Composer
Others
HTML CSS SCSS Bootstrap TailwindCSS REST_API JSON WebSockets WebRTC
/ worldwide-sales

8,700+

Total Products Sold

/ infrastructure

2,363+

Schools on ERP

/ client-rating

4.31★

Avg. Envato Rating

/ architecture

10+

SaaS Products

#services

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Backend

SaaS & Platform Architecture

I architect multi-tenant SaaS platforms built to handle thousands of concurrent users without breaking. From subscription logic and role-based access to co...

  • 01/Multi-tenant architecture with separate database per tenant
  • 02/Subscription and billing logic with Stripe or SSLCommerz
  • 03/Role-based access control with Spatie Permissions
Development

Custom Business Systems (ERP, CRM, POS)

I build custom ERPs, CRMs, POS systems, inventory tools, school management platforms, and hospital systems that replace manual chaos with clean automated i...

  • 01/Custom ERP and CRM systems built around your exact workflows
  • 02/POS systems with inventory, reporting, and multi-branch support
  • 03/School, hospital, and institution management platforms
Backend

Backend Rescue & Refactoring

If new features take weeks to ship, bugs appear out of nowhere, or your system slows under load — your foundation needs work. I specialize in strategic ref...

  • 01/Full codebase audit to identify bottlenecks and technical debt
  • 02/Modular refactoring using Laravel service and repository patterns
  • 03/Automated test suites to eliminate regression risk