Jeffrey Yang — Resume

Jeffrey Yang

Los Angeles, CA jeffreydavidyang@gmail.com github.com/jeffreyyang3 linkedin.com/in/jeffreyyang3
Resume PDF

Senior software engineer with 5+ years of full-stack experience across consumer and enterprise products.

Experience

Celonis

Los Angeles, CA

Senior Software Engineer

Software Engineer

  • Owned the Celonis Knowledge Model backend: a user configuration store, and business semantic layer powering all data queries throughout the platform in non-legacy products
  • Led planning, design, and implementation for product features and engineering initiatives. Coordinated discussion, work and prioritization across multiple engineering teams, product areas, countries
  • Reduced latency in main product (Celonis Studio) query execution path from ~600 to ~200ms over a quarter through instrumentation, caching, eager fetching, and cross-team investigation + prioritization
  • Primary technical lead for foundational Knowledge Model Object-Centric event logs feature, creating a base framework and philosophy for virtual table use, built upon by other teams in later products.
  • Heavily utilized Claude Code and Codex for spec-driven agentic engineering, company-wide codebase research, large scale refactoring / codebase maintenance, MCPs (Datadog, Slack, Jira, and more). Created coding standards, reusable scaffolding plans, business context summaries for agents
  • Direct technical advisory and implementation for enterprise customers; developed custom migration tooling to enable successful retirement of a legacy product
  • Created Jest based API testing framework with strongly typed clients, authentication, automated setup and cleanup actively used and contributed to by multiple teams
  • Frontend feature development for Q&A based business data explorations Angular application
  • Gave tech talks for LA, Bay Area, Munich audiences: Playwright integration testing, Latency investigations, custom integration testing framework, virtual table product / engineering philosophies

Opendoor

Los Angeles, CA

Software Engineer

  • Full stack engineer on home browsing experience, and ops-focused internal tooling
  • React Native mobile app (React Native) and web feature development for home browsing, tour scheduling, home unlocks
  • Rails / MongoDB backend work in operational and marketing SMS, email using Twilio, Litmus
  • Monitoring, analytics, and analysis using Datadog, Amplitude, Optimizely, Snowflake

Poshmark

Redwood City, CA

Software Engineer

  • Primary frontend engineer for features including bulk closet actions, seller clienteling tools, mobile-web listing creation, and listing tags using Vue.js and Node
  • Wrote documents for technical implementation, scoping, rollout plans.
  • Post-launch + continuous monitoring using clickstream data, Kibana, and Datadog
  • Developed web features to run inside native mobile webviews
  • Migrated web and mobile features from Rails/jQuery SSR frontend to Vue.js

Technologies

Java, JavaScript/TypeScript, Spring Boot, React, Angular, Vue, Ruby on Rails, MongoDB

Education

University of California, Santa Cruz

B.S. Computer Science

Santa Cruz, CA