Yuwei Liang
Summary
Software engineer with 10+ years shipping production e-commerce and marketplace systems at scale. Deep experience in backend services, distributed systems, payments, billing, and full-stack web; day-to-day user of AI-native development workflows (agentic coding, LLM tooling). Currently engineering marketplace billing at Cart.com.
Experience
Cart.com — ShopHouzz MarketplaceFeb 2026 – Present
Software Engineer, Billing & AccountingRemote
- Vendor Payouts: Single-handedly designed, built, and shipped the ShopHouzz vendor payout system end-to-end in a matter of weeks, processing millions of dollars in vendor disbursements shortly after launch.
- Returns: Leading design and implementation of the ShopHouzz return system covering refund flows, financial reconciliation, and vendor-side workflows.
- Vendor Banking: Designed the ShopHouzz vendor banking service (AWS Lambda + DynamoDB + Plaid) for onboarding and ACH flows; live in dev as of Apr 2026.
- Vendor Integration Reliability: Lead responder for the SPS Commerce EDI pipeline processing 1,000+ files daily across 200+ vendors — diagnosing data, mapping, and reliability issues to keep partner integrations running.
- Test Automation: Built the team's E2E automation program from zero — Playwright UI suite plus pytest API and SFTP coverage on sharded GitHub Actions CI with Slack-routed alerts — establishing the deployment-confidence bar across vendor-portal and billing services.
- Observability & On-Call: Built pricing and 846 EDI monitoring dashboards (Terraform-provisioned, Datadog) for billing and vendor-integration services running on Docker; carries on-call rotation for these surfaces.
Houzz, Inc. — Marketplace2018 – Feb 2026
Full Stack Software EngineerLos Angeles, CA
- Checkout & Payments: Re-architected order-creation workflow, cutting API response time by 90%. Integrated Apple Pay Express Checkout for mobile web, contributing to a 20%+ GMV lift on that checkout surface.
- Billing & Accounting: Built TIN/EIN tax-compliance system integrated with NetSuite, helping 3,000+ partners avoid IRS penalties. Recovered tens of thousands in overpaid sales tax via a comprehensive Avalara API integration.
- Payment Terms: Led multi-term payment system that reduced engineering involvement in net-term setup by 80%; shipped a 2% quick-pay incentive generating meaningful contribution margin.
- Product Ads: Diagnosed and fixed a critical Google Ads conversion-tracking bug, improving ROI measurement accuracy by 35% and unblocking data-driven campaign optimization.
- Supplier BI: Led engineering of supplier-insight reporting platform serving 1,000+ active vendors with sales, inventory, and ads analytics.
- Recognized in performance reviews as the go-to domain expert for marketplace accounting; mentored junior engineers across teams.
Zobrist Consulting Group2015 – 2018
Software DeveloperLos Angeles, CA
- Led development of Mobilecom, a SaaS mobile-first storefront for IBM WebSphere Commerce; client deployments saw mobile conversion-rate improvements of ~25%.
- Optimized React/Redux app performance, reducing load time by 35% and improving customer engagement metrics across client sites.
Projects
LoopiiMar 2026 – Present
Festival companion app — Coachella 2026
- Solo-Built & Shipped: Designed, built, and shipped Loopii — a React Native (Expo) iOS app — solo from zero to TestFlight in ~6 weeks, used by a private squad on the ground at Coachella 2026 W2.
- Realtime & Offline: Engineered live-map location sync (Mapbox + Firestore) and group chat with persistent offline cache; designed a Bluetooth-mesh fallback (react-native-ble-plx + custom CBPeripheralManager native module) for when cell signal drops at the venue.
- Server-Side Push: Built the push pipeline on Firebase Cloud Functions (Node.js 20) → Expo Push API → APNs, including a scheduled job that pings each user 30 minutes before their picked artist's set time.
- Claude-Driven UX: Drove the entire UX system — screens, navigation, day/night theming with 4 colorways, component composition — with Claude as the design partner, iterating on AI-generated design previews before translating to React Native.
- AI & Release Engineering: Integrated a Claude-powered in-app FAQ assistant and artist-recommendations engine; automated TestFlight delivery with Fastlane (auto-version bump, build, upload, GitHub release) behind a one-command deploy.
Technical Skills
Languages: Java, Python, JavaScript/TypeScript, PHP, SQL
Backend: REST/GraphQL APIs, microservices, distributed systems, event-driven architectures, query optimization, Node.js
Frontend & Mobile: React, Redux, React Native (Expo), HTML5, CSS3, responsive web
Data & Storage: MySQL, Postgres, Snowflake, Redis, DynamoDB, Elasticsearch, Solr, data pipelines
Cloud & DevOps: AWS (Lambda, DynamoDB, S3, API Gateway), Firebase (Firestore, Cloud Functions, Auth), Kubernetes, Docker, Terraform, CI/CD, Git
Observability: Datadog, Grafana, time-series dashboards, on-call rotation
Integrations: NetSuite, Avalara/AvaTax, Stripe, Plaid, Apple Pay, Google Ads
AI & Developer Tooling: Claude Code, agentic development workflows, LLM-assisted code review, MCP servers
Education
M.S., Software Engineering University of California, Irvine
2015B.S., Information Security Beijing University of Posts and Telecommunications
2013