Square Installments, Square's first consumer lending program.I led the team responsible for loan servicing which covers loan origination, interest accrual, fee assessment, payment processing, and borrower dashboard. I collaborated with the servicing PM to set OKRs and team roadmap. I oversaw a reimplementation of the main Installments servicing logic, working with domain experts to a simplified system.After a series of issues were discovered in the Installments code base, I led an effort to catalog, triage and fix issues while simultaneously improving system reliability, correctness and time to recovery. When issues negatively affected borrowers, I led analysis and borrower remediation. This was done in collaboration with Legal and Finance teams to ensure all issues were thoroughly documented for regulators.I took on engineering projects to improve loan payment rates, implemented underwriting experiments for the risk team, and improved the customer support dashboard for borrowers.I provided technical direction and led the project to report borrower behavior and standing to credit reporting agencies.

Co-founding engineer of Developer APIs team. In this role I designed and implemented a lot of Square's initial developer APIs. I collaborated on API infrastructure including the OAuth service, the backing store for the Items Catalog API, and rate limiting. Worked with product engineering teams to define API principles which guide all developer APIs. Launched partnership with Intuit to retrieve a Square Merchant's transaction data into Quickbooks using the Developer APIs. Promoted to Engineering Manager responsible for Developer APIs and App Marketplace engineering teams (10 engineers). Decided strategy, roadmap and staffing. Collaborated with Partnerships team to identify and support API partners. Championed a Developer API First strategy to company leadership and across engineering teams. Internal teams started to use the Developer APIs for simplified access to other internal services.

Localized Square's main monolith codebase to handle multiple languages, currencies and countries. Advised other engineering teams how to became locale aware. Fixed numerous issues in other Square codebases that assumed all merchants were located in US and spoke English.Designed and implemented a new activation service that would allow Square to rapidly build, test and deploy per-country activation flows. Implemented activation flows for Canada and Japan on the new service. Integrated with multiple external vendors and banking partners for identity verification and KYC compliance.Successfully moved identity verification service into the new datacenter with zero downtime, becoming the first non-payment and non-Java service to make the transition. This required working with NetEng to understand traffic routing differences, and supporting two different datacenter specific deployment systems.

Implemented a single entry ledger to track all operations affecting a merchant's balance. The ledger provided a means to reconcile balances, while replacing adhoc methods and resolving multiple issues.Designed and implemented Mobile Staff, a product feature that allows field employees to take payments on behalf of a merchant.Designed, implemented and supported a private external API used for presidential campaign fundraising, and two national charities.

Part of the team that did a ground up rewrite of Google Maps for mobile devices in Javascript, replacing the existing Java based version.Implemented a new map panning system for desktop and mobile web users that added momentum to panning. As part of this work I measured and optimized the core panning logic of Google Maps, and worked with SREs to prepare for the increased demand on map tiles.Identified multiple sources of confusion in the codebase that resulted in logic bugs. Led a team effort to cleanup the confusion and fix the bugs.

Text ad overlays on videos, new YouTube specific targeting mechanisms in AdSense. By the time I left the team they had reached a $1B ARR.

Founder of team. Successfully monetized several Flash games with AdSense ads and improved ad mixer to allow advertisers to target Flash games with video ads. Performed technical due diligence of a technical acquisition target. Went on to lead acquisition engineering team, integrated them into Google engineering systems and culture, delivered integration milestones ahead of schedule.

Helped team port Google Desktop to Vista which was launching a few months later. Detect the Vista gadget sidebar and modify the visual behavior of its gadgets to clearly message the user that they could not be docked to the Google Desktop sidebar. Tech Lead of search quality team before moving off team.

Substantial contributions to Visceral's tools and pipelines. Primary maintainer of pipeline that processes all assets into a game ready state. Designed and authored two studio-wide visual effects systems; budgeting system that enforced technical limits on asset usage and performed report generation; various tools to interrogate dependency graphs.

Memory and performance optimization. Mentored junior engineers. Member of the engineering council tasked with bringing the game to completion.

Brought in to help team ship. Lead a team of 4 engineers to fix the UI.

Designed and implement the visual effects system from ground up: runtime, tools and pipelines. Worked closely with visual effects art team and art director.

Worked on location at third party developer (Page 44) to help ship. Implemented PS2 audio engine from ground up with no prior experience at audio programming. Designed and implemented music streaming and commentary systems.

Supported in-game scripting system, extended graphics shading engine. Worked closely with artists and level designers to achieve look and gameplay goals. Together with a level designer, responsible for two of the games major levels. Contributed crucial fixes to reduce memory footprint, optimization and bug fixes.