Christopher Walter

Frontend Engineer focused on building performant products that delight end users.

LinkedIn chris@christopherwalter.com GitHub Resume PDF

Selected Experience

My background spans large consumer platforms, developer tooling, internal infrastructure, and early-stage product building. The highlights below mirror the current resume.

Meta

Software Engineer

12/2024 - 04/2026
  • People Data Infra: shipped new APIs for internal AI agents to leverage sensitive workforce data safely, unblocking downstream teams’ AI roadmaps.
  • Built an autonomous AI solution to find and fix root causes of worker data discrepancies across first- and third-party data sources, achieving our org’s 6-month goals in less than two weeks.
  • Led large-scale data migrations to improve data quality and prevent bugs across Meta’s internal tools.

Expo

Software Engineer

05/2022 - 08/2024
  • Product owner for Expo Push Notifications, handling 1B+ notifications per month to millions of devices across tens of thousands of mobile apps.
  • Increased Expo Push Notifications service uptime from <90% to 99.99+ and reduced latency with new async APIs, improved k8s scaling, and automatic regression detection.
  • Designed and shipped V1 of EAS Insights, a plug-and-play analytics service for app developers and a new potential revenue stream for Expo.
  • Built EAS Insights for high performance at scale while being cost-efficient for Expo, via a serverless ingestion architecture built on Cloudflare edge APIs + GCP cloud functions, and scalable ClickHouse OLAP data stores.

Google

Senior Frontend Software Engineer

04/2021 - 04/2022
  • TL of a four-engineer YouTube Ads team, focused on new ads formats and raising user sentiment.
  • Launched new tools to gather user sentiment data from billions of users in production, a P0 goal for the YT Ads org.
  • Oversaw design, execution, experimentation, and launch of new ad formats in feed.
  • Contributed to a refactor of the Android client that reduced TTL for complex ads formats.

Arize AI

Founding Engineer

03/2020 - 03/2021
  • Led engineering of the Arize web product, from whiteboard sketches to paying customers and a Series A in 1 year (built with React, RelayJS, GraphQL, NodeJS, Postgres).
  • Incorporated the latest UX research and frontend technologies, including experimental builds of React (Hooks, Suspense, Concurrent mode), RelayJS (data+resource parallel prefetching), and GraphQL (@stream/@defer).
  • Established the frontend engineering team and grew the team from one engineer to five.

Facebook

Frontend Software Engineer

05/2017 - 03/2020
  • Recruiting Products: launched tools that improved discoverability of high-quality candidates; re-designed employee referrals to improve outcomes for candidates, employees, recruiters.
  • Instagram Core Business: launched features to manage age-restricted advertising on IG; built MVP to show viability of suggested product tags on IG Shopping (a cross-functional effort with IG Core Business, IG Shopping and FB Commerce).

UC Berkeley

B.A. Computer Science & Economics

2012 - 2016
  • President, Debate Society of Berkeley.

For the complete one-page resume, including contact details in PDF form, see christopher_walter_resume_apr_2026.pdf.