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Zulquairnain Haider

@zulquairnainhaider

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Senior Ruby on Rails Engineer at Viral Square who delivered a zero-downtime Rails 4-to-7 migration for OpenClosit.

Pakistan

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At Viral Square, I delivered a zero-downtime Rails 4-to-7 migration for OpenClosit while the platform continued processing transactions. I also implemented Stripe-based PSD2/SCA card verification for European markets.

On NoYellingDriving, I integrated Xero reconciliation across Stripe, AfterPay, and bank deposits, and developed booking and payment workflows for the marketplace. At TECHCREA TIX., I integrated card networks and NACHA-compliant ACH flows for QuickCard 2.0, and created an internal Ruby SDK for secure communication across microservices.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Viral Square

Apr 2024 - Present (2 years 7 months)

Spearheaded PSD2/SCA Strong Customer Authentication for European markets via Stripe, achieving 100% compliance with EU payment regulations. Led zero-downtime Rails 4 to 7 migration on a live production platform and engineered Xero accounting integration automating reconciliation across multiple payment channels.

Ruby on Rails Ruby Stripe PSD2 SCA Xero REST APIs HTML5 JavaScript Tailwind Twilio PostgreSQL Sidekiq AWS

Software Engineer

TECHCREA TIX

May 2021 - Apr 2024 (2 years 11 months)

Integrated Visa, Mastercard, and Discover with NACHA-compliant ACH debit flows, ensuring full audit and retention compliance for US merchant authorizations via Stripe. Optimised Sidekiq job queues, eliminated N+1 queries, and implemented a custom Ruby Gem for secure inter-service communication across microservices.