Phillip YoungPhillip Young

Building a zero-fee, peer-to-peer men's fashion marketplace as sole engineer — a ~110k-line TypeScript monorepo (React PWA, ~70 Firebase Cloud Functions) with 550+ commits shipped over the last 18 months.

• Pivoted the dormant Betaflops platform into a multi-brand architecture serving two storefronts from one codebase: domain-driven branding, per-brand Vite builds with env-injected PWA manifests, and Firebase multi-site hosting.
• Designed a cross-marketplace listing engine for eBay, Grailed, and Depop — Cloud Functions build canonical payloads, a Firestore-backed queue tracks operations, and a Chrome (MV3) extension executes them through the seller's own logged-in sessions, with exactly-once posting via Web Locks leader election, sync tokens, and server-side claims.
• Implemented marketplace payments on PayPal: partner-referral seller onboarding, instant-disbursement captures with platform fees, and binding offers backed by 48-hour authorizations that capture on acceptance or auto-void via Cloud Tasks; webhook-driven refund and dispute handling.
• Automated listing creation with Gemini structured-output extraction (category, size, brand, color, material, condition from photos) using per-market dynamic schemas, plus voice dictation input.
• Extended Typesense search with per-market facet schemas and semantic similar-item search via auto-embedded listing vectors.
• Built bidirectional inventory sync (weekly/biweekly schedulers) with price mirroring, sold/deleted reconciliation across platforms, and Levenshtein-based relist detection.
• Kept scraping-based importers alive against bot management by iterating from Chrome TLS-fingerprint impersonation to geo-pinned residential proxies, with scheduled per-marketplace health-check canaries.
• Served Open Graph link previews for the SPA with a Cloudflare Worker + KV populated from Firestore triggers.
• Modernized the 2020-era codebase: CRA → Vite 8, Firebase Functions v1 → v2 (Node 24), React Router 7, joi → zod, with 20+ production data-migration scripts.
• Built a streaming image pipeline (busboy → sharp → WebP + thumbnails) with Cloud Vision SafeSearch moderation.

• React
• TypeScript
• Vite
• Firebase
• Firestore
• GCP
• Typesense
• PayPal
• Gemini
• Cloudflare Workers
• Chrome Extensions

One of the first two employees at a venture-backed startup building a modular app and workflow platform.

• Helped establish core engineering practices and technical direction using TypeScript and Solid.js.
• Designed and implemented Postgres integration: schema architecture, frontend bindings with caching, and optimistic updates.
• Built custom Vite plugins to compile user-written JavaScript and bundle Python code for in-browser execution.
• Developed framework-specific libraries for React, Svelte, Vue, and Solid to integrate with the platform.
• Architected a secure iframe-based sandbox for executing user modules with messaging and data syncing.
• Created a granular permissions and sharing model for user-created apps.
• Built modules for integrations including Airtable, Dropbox, Spotify, AI, and crypto APIs.
• Implemented user onboarding with interactive tutorials and demo apps.
• Wrote external developer documentation using Docusaurus.
• Integrated analytics via OpenReplay, PostHog, Clarity, and Umami (with proxying for ad-block evasion).
• Managed deployments with AWS Copilot, Fargate, ECS, and CodePipeline.

• TypeScript
• Solid.js
• Postgres
• Vite
• AWS

Solo-built a peer-to-peer marketplace for buying and selling mechanical keyboards.

• Integrated PayPal Marketplaces API for order and payment handling.
• Built an integrated chat app with support for image sharing, notifications, and tracking orders.
• Developed a fast, full-text search and filtering experience using Typesense and InstantSearch.js.
• Used Google Vision and AI tools to automate content moderation.
• Designed a cost-efficient document-based database schema with built-in redundancy to optimize cloud resource usage.
• Wrote responsive transactional and marketing emails using MJML, and handled delivery via Amazon SES and SendGrid.

• React
• TypeScript
• Firebase
• Firestore
• GCP
• Cloud Functions
• Typesense
• Elastic UI

Contributed to SPARC processor development by building physical design tools and automation workflows.

• Developed algorithms and visualization tools in Perl, Tcl/Tk, and C to optimize floorplanning and routing.
• Created reusable, electromagnetically clean bus-routing patterns later adopted by Synopsys.
• Designed congestion maps and GUIs to visualize ASIC layout constraints.
• Built shape-aware data structures to avoid DRC errors across massive metal/via datasets.
• Optimized tool runtime and memory use via parallelism for 7nm process nodes.
• Led transition from 10nm to 7nm tooling process across the team.

• Perl
• Tcl/Tk
• C