Resumé

Harrison Liddiard

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Launched new merchant onboarding, cutting required signup fields by 60% and introducing upfront compliance verification, contributing to +$35M ARR.
Redesigned personal-to-business account conversion, reducing reversals 64% (~$4M/yr support cost savings), and driving 68K net-new signups (~$2M/yr incremental revenue).
Designed and ran A/B test inverting the onboarding funnel, letting users create an invoice before signup, doubling signup and activation rates.
Building AI-powered payment integration assistant to agentically crawl merchant sites, assess tech stacks, and create tailored integration guides.

Led experiment implementations on Node.js + React stack that lifted merchant onboarding completion rate and product adoption.
Won internal and external hackathons for PayPal, recruited, helped plan PayPal’s annual developer conference.
Developed software that helped 100s of employees meet each other during Covid WFH.

Increased CMS search speed 10x w/ Elasticsearch, redesigned UI.
Wrote binary search typographic headline balancer that ran on all nytimes.com article pages.

Worked among several departments to prioritize, design, and build web applications to support UCLAʼs largest athletic events.
Created web style guide, worked with website provider to coordinate full site redesign.

Edited and advised 80+ people in web development, videography, podcasting and blogging at UCLA’s student news organization.

Computer Science & Linguistics, B.A.

PRDs, A/B testing, scrum master, cross-functional collaboration, prototyping, UX design, data analytics

Python, JavaScript, SQL, React, HTML/CSS, API design

Jira, Figma, Claude Code & Cowork

TrainTracker: live-updating map for North American passenger rail
Stream Editor: use command-line text manipulation tools interactively on the web
Weather/transit board: colorful, informative LED fridge magnet using HTML Canvas
Slack Meetups: pair people in a channel for 1:1s and generate visual reports