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 — each one owned deep into production.
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.
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.
Oct 2025 — Present ● now
Building a full-stack residential real-estate platform for independent agents and agencies.
Feb 2025 — May 2026
Delivered end-to-end modules for an enterprise manufacturing platform built in Go.
Oct 2024 — May 2025
Designed and built the company's core diagnostics platform for the used-device industry.
Nov 2024 — Mar 2025
Built features for an enterprise cloud property-management platform.
Jun 2020 — Nov 2024
Kept a global real-estate aggregation platform crawling, processing and online.
Nov 2019 — Jun 2020
Ran Linux infrastructure hosting production WordPress sites.
Opinionated where it matters, pragmatic everywhere else.
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.