Charles David Olivar

Squarespace, Scheduling

• +9.7%more trials became subscriptions after I rebuilt the Scheduling navigation. Modeled at $934K a year.Led implementation of the Scheduling navigation redesign, re-architecting it as a shared React/TypeScript component that replaced 10 menu-schema files and 8+ pieces of manual state with one route-based context, lifting 8-day trial-to-subscription 9.7% ($934K/yr modeled) in an A/B test.
• +20%more visitors subscribed from the new Scheduling homepage, which gets 35K visits a day.Owned the technical planning and implementation of the Scheduling homepage redesign (35K daily visits) lifting landing-to-subscription 20%.
• 87%of a 21.4 second signup was one auth step. I wrote the proposal, another team built it, and 3 products use it now.Traced a 21.4s signup load across 5 services, isolating 18.7s (87%) to one auth step; wrote an RFC for synchronous provisioning that another team built and shipped, now used by 3 product lines.

Priceline, Email

• +123%more bookings from the VIP Monthly Recap email redesign. Net value per send was up 106%.Built 5 A/B-tested email experiments in Handlebars and React across promotional and abandoned-search emails. All 5 lifted bookings and net value per send, with the top result VIP Monthly Recap redesign: +123% bookings, +106% net value per send.
• 97Kemail receipts sent a day.Built a React/TypeScript and Node service rendering 97K daily hotel, flight, rental car, and package email receipts, replacing Iterable to meet a 30-second delivery SLA.
• +7.7%more bookings per million sends from cross-sell deal cards.Updated a deal card service using Express and Puppeteer for dynamic cross-sell email promos using new inventory APIs and updated designs, leading to +7.7% bookings per 1M sends.

Indeed, Job search

• +11.5%more mobile apply starts from the recent-search tabs I built.Boosted mobile apply starts 11.5%, positive outcomes 5.2%, and resume creations 1.7% by building an internationalized tabbed recent-search feature.
• +7%more apply starts, and 4.6% more expected hires, from the homepage job feed. I led it from design doc to launch.Led creation of the homepage job feed, driving +7% apply starts, +4.6% expected hires, and +3% active sessions. Wrote the design doc, aligned partner teams on the plan, delegated tickets, and built key React/TypeScript UI.
• 32accessibility bugs fixed to meet WCAG 2.1 AA. Tested with Axe, VoiceOver and TalkBack.Resolved 32 accessibility (a11y) bugs, meeting WCAG 2.1 AA compliance to mitigate legal risk. Verified outcomes with Axe, VoiceOver, and TalkBack.

Skills

• TypeScript
• JavaScript
• React
• Node.js
• Express
• Redux
• HTML
• CSS
• Tailwind
• Styled Components
• Sass
• Jest
• Testing Library
• Cypress
• Puppeteer
• WCAG 2.1 AA
• i18n
• A/B testing
• Statsig
• LaunchDarkly
• PagerDuty
• Git
• Claude Code

Full-time

1. 2026Senior Software EngineerSquarespace
2. 2024Software EngineerSquarespace
3. 2022Software EngineerPriceline
4. 2021UX DeveloperIndeed
5. 2019Associate UX DeveloperIndeed

Internships and teaching

1. 2018UX Design InternIndeed, San Francisco
2. 2018CS160 ReaderUC Berkeley, UI Development
3. 2017Software Engineering InternWalmart Global Tech
4. 2017CS61B Academic InternUC Berkeley, Data Structures

Talk to me about

• Photography
• Switchfoot
• The Braves
• C.S. Lewis
• DC Comics