Engineering leadership / web systems / product teams

Hi, I'm Haris. I build strong teams, durable systems, and seller-facing products.

I currently lead product engineering for Square's Customers and Staff web teams, shaping org-wide web strategy and seller-critical systems from Toronto, Canada.

Portrait of Haris Mahmood in Antarctica, March 2023
antarctica, march 2023photography: @harisaurus

I’m a Senior Engineering Manager with 12+ years of experience leading web, mobile, and platform teams across Shopify and Square. My work has spanned consumer products, seller-facing systems, and financial infrastructure in regulated domains.

At Square, I lead product engineering for the Customers and Staff web teams, overseeing org-wide web strategy and execution across a team of engineers ranging from junior developers to tech leads. I’ve led large-scale re-architecture efforts for seller-critical systems, improved reliability and operational rigor, and helped teams move faster while raising the quality bar.

I care deeply about organizational design, technical judgment, and developing strong senior talent. I’ve built high-trust, high-performing teams, supported promotions and career growth, and embedded AI into engineering workflows to improve execution, code review, and delivery quality.

Previously at Shopify, I led and built teams across some of the company’s highest-traffic product surfaces and was part of the foundational growth of the Shop app and early React Native adoption. If you’re looking for an engineering leader focused on durable systems, strong teams, and meaningful product outcomes, please email me or reach out on LinkedIn.