I build multi-tenant SaaS
Senior Software Engineer with 7+ years shipping production SaaS, backend, cloud and automation systems — owning them end-to-end, from architecture to production operations.
// engineer, shipped to production since 2019
var hasnat = Engineer{
Name: "Hasnat Sajid",
Role: "Senior Software Engineer",
Stack: []string{"Go", "Python", "TS"},
Focus: []string{"AI", "Backend", "Cloud"},
Owns: "architecture → prod",
Coffee: math.Inf(1),
}
func main() {
hasnat.Build("your next platform")
}Trusted to build production software at
I've spent the last seven years building software that real businesses depend on every day — across real estate, manufacturing, device diagnostics and property management.
My home turf is the backend: Go and PostgreSQL, multi-tenant architecture, RBAC, business-critical APIs and the infrastructure that keeps them healthy. I've led a legacy TypeScript-to-Go migration, architected platforms from a blank page, and run the Linux fleets underneath them.
Lately I've been weaving AI into products and operations — LLM-driven content generation, AI-powered analytics and automated documentation — where it removes real manual work, not just where it's trendy.
Four disciplines I bring to every team — usually all at once.
Business-critical APIs and services in Go that stay fast and sane as the product grows.
Practical AI inside real products — generation, analytics and automation that save hours.
Infrastructure that deploys cleanly, recovers on its own and doesn't wake anyone up.
From blank page to production: architecture, data model, UI and operations — owned end-to-end.
Real products with real users — from multi-tenant ERP and diagnostics platforms to an offline-first Quran app I build solo.
A full-stack residential real-estate platform for independent agents and small-to-mid agencies — listings, leads, marketing and day-to-day operations in one place.
The core diagnostics platform for the used-device industry, architected from scratch to serve organizations, facilities, stations and teams.
A modular ERP for Saudi businesses — CRM, sales, projects, procurement, inventory, logistics, fleet and finance in one system, where records flow between modules instead of living in disconnected screens.
A calm companion for prayer, Quran, hadith and daily reflection — works without an account, offline once downloaded, with no ads and no tracking.
A white-label store engine — storefront, checkout and back office in one Go binary — shown here as a specialty-coffee shop. Each client gets their own copy, database, domain and branding, in English and Arabic.
Enterprise manufacturing software covering production monitoring, Andon systems, batch management and work-order analytics.
A large-scale real-estate aggregator crawling and processing property listings from websites across global markets.
Seven years, six companies, newest first. Keep scrolling to rewind.
01 / 06
Building a full-stack residential real-estate platform for independent agents and agencies.
02 / 06
Delivered end-to-end modules for an enterprise manufacturing platform built in Go.
03 / 06
Designed and built the company's core diagnostics platform for the used-device industry.
04 / 06
Built features for an enterprise cloud property-management platform.
05 / 06
Kept a global real-estate aggregation platform crawling, processing and online.
Ran Linux infrastructure hosting production WordPress sites.
Opinionated where it matters, pragmatic everywhere else. Lit skills are traceable: pick one to see where it shipped.
Straight answers to what clients and hiring teams usually ask first.
Yes. I take on remote contract projects — new platforms, Go backends, AI and LLM features, cloud infrastructure, and architecture or code reviews — as well as senior full-time backend, platform and AI engineering roles. Send a short note through the form below or to [email protected]; I usually reply within a day.
Backend-heavy SaaS that a business depends on daily: multi-tenant architecture, RBAC, business-critical APIs in Go and PostgreSQL, and the infrastructure underneath. I've architected platforms from a blank page (Recheck360, Vertex ERP), led work on a TypeScript-to-Go migration (Operational Software), and kept a global crawling platform running for 4+ years (EveryListing).
Yes. I've shipped AI-generated property descriptions and marketing content at Circumz and contributed to AI-powered analytics and automated documentation at Operational Software. I build with the OpenAI and Anthropic APIs, RAG, embeddings and vector search — and only where AI removes real manual work.
Yes. At Operational Software I played a major role migrating a legacy TypeScript codebase to Go for performance, scalability and maintainability, while continuing to ship production features like Andon systems, batch management and work-order analytics.
Mainly Go, Python and TypeScript; PostgreSQL and Redis for data; AWS, GCP, Docker, Kubernetes, Terraform and GitHub Actions for infrastructure; and React, Next.js or HTMX on the frontend.
I'm based in Lahore, Pakistan (PKT, UTC+5) and work remotely with teams worldwide. I've built production software for Circumz, Operational Software, R3 Diagnostics, Accez and EveryListing.
Whether it's a senior role, a platform to architect or AI to wire into your product, I'd love to hear about it. I usually reply within a day.
