Senior Software Engineer · Karachi, PK

Zeeshan Habib

I write backend code for industries that don't forgive mistakes — healthcare and money. Multi-tenant SaaS platforms, payment infrastructure, and the queues and migrations that keep them running quietly.

Zeeshan Habib
Zeeshan Habib senior_engineer.php
role
Senior Software Engineer
focus
Multi-tenant SaaS, payments
stack
PHP · Laravel · JS · .NET
based
Karachi, Pakistan
status
@ Invision Custom Solutions
About

What I actually do

I've spent the last 7+ years writing backend systems, most of it in Laravel. Day to day that means building multi-tenant platforms, wiring up payment gateways — Stripe, Authorize.net, PayFast and a few others — and making sure a failed subscription charge doesn't quietly turn into an angry email three weeks later.

I care more about the boring parts than the exciting parts: clean migrations, services that do one thing, config over hardcoding, and systems that fail loudly instead of silently. If something breaks at 2am, I want the logs to tell me why before a customer does.

7+years experience
25+projects shipped
2core specializations
FTat Invision Custom Solutions
Skills

Stack

What I reach for, grouped by what it's for rather than how impressive it sounds.

CategoryTechnologies
Backend PHP · Laravel · .NET · C# · MySQL · PostgreSQL · REST APIs
Frontend JavaScript · HTML5 · CSS3 · jQuery · AJAX · Responsive UI
Specializations Multi-tenant architecture · Payment integrations · Healthcare systems · E-commerce platforms
Tools & Infra Git · Docker · Linux · Apache · Nginx · AWS · CI/CD
Experience

Where I've worked

Four roles, one thread — backend systems for products that can't afford to be flaky.

Jan 2024 — Present

Senior Software Engineer

Invision Custom Solutions Inc. · Karachi

Leading a team of four architecting microservices for system performance. Driving optimization work across apps used by 10,000+ monthly users, and setting up code review practices the team still uses.

Apr 2022 — Dec 2023

Software Engineer

Invision Custom Solutions Inc. · Karachi

Built a Twilio-based video conferencing platform with 1,000+ daily users, and a SaaS billing system handling $500K+ in monthly payments across multiple gateways. Added WebSocket-based real-time alerts and cut response times through caching and query optimization.

Dec 2021 — Mar 2022

Software Engineer

Avancera Solution · Karachi

Ran detailed code reviews and helped enforce coding standards. Worked in an eight-person agile team building CI/CD pipelines and pushing Laravel adoption, cutting the dev cycle by 30%.

Apr 2020 — Nov 2021

Software Engineer

Vital Group · Karachi

Wrote technical documentation for 10+ applications and improved performance by 25% across major projects. Built responsive UIs in HTML5, CSS3 and JavaScript with solid cross-browser support.

Contact

Let's build something

Have a backend that needs fixing, a payment flow that's misbehaving, or a project you'd like a second opinion on? Send a note — I read everything myself.