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Haseeb Ullah

@haseebullah2

Full Stack Developer at Karma Software Solutions who integrated Fiserv CardConnect payments handling $300K+ in monthly transactions.

Pakistan
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At Karma Software Solutions, I built a Fiserv CardConnect payment integration for Accountant Blue Book, covering merchant onboarding, transactions, and refunds, with $300K+ in monthly transaction volume. I also integrated Stripe subscriptions across 1,000+ tenants and built billing calculations to match Stripe invoices.

I built the backend of Impact Academy, a multi-tenant learning management system at United Tissue Network, serving 500+ tenants with role-based access and real-time progress tracking. I developed REST APIs and optimized SQL Server queries and indexing, delivering 30% faster response times.

As a Full Stack Developer Trainee at ProgrammerzHub, I contributed to a POS system used by 100+ stores. I implemented transaction handling, finance reporting, and inventory management modules that reduced manual errors by 40%.

Experience

Work history, roles, and key accomplishments

KS
Current

Full Stack Developer

Karma Software Solutions

Sep 2025 - Present (1 year 1 month)

Built a Fiserv CardConnect payment integration from scratch, covering merchant onboarding, transactions, and refunds, with $300K+ in monthly transaction volume. Integrated Stripe for subscriptions across 1,000+ tenants and fixed billing mismatches by building in-system tax, package, and add-on calculations that match Stripe invoices.

UN

Full Stack Developer

United Tissue Network

Nov 2024 - Aug 2025 (9 months)

Built the backend of a multi-tenant LMS from scratch, serving 500+ tenants with role-based access and real-time progress tracking. Developed 10+ modules with RESTful APIs in .NET Core, EF Core, and CQRS, enforcing rules such as unique course-user mapping and due date validation.

PR

Full Stack Developer Trainee

ProgrammerzHub

Feb 2024 - Nov 2024 (9 months)

Contributed to an end-to-end POS system using .NET Core and SQL Server. Implemented transaction handling, finance reporting, and inventory management modules, reducing manual errors by 40%.

Education

Degrees, certifications, and relevant coursework

Virtual University of Pakistan logoVP

Virtual University of Pakistan

Bachelor's, Computer Science

Bachelor's in Computer Science from Virtual University of Pakistan, completed in 2025.

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