samdeguzman

BrandSnap • Built the core engine behind BrandSnap, turning a seller's campaign brief and product SKU into a full marketing pack, strategy, rollout plan, ad copy, and key visuals via an eight-agent Gemini pipeline on Vertex AI, with a declarative dependency graph resolving into parallel execution waves in 60–120s end-to-end. • Designed the serverless GCP backend—Cloud Run, Cloud Tasks with OIDC auth, Firestore, GCS, Secret Manager—with the execution worker on internal ingress, reachable only by Cloud Tasks for secure task orchestration. • Built the React/Express/PostgreSQL application, streaming multi-minute runs to the browser via Server-Sent Events over Firestore real-time listeners, replacing polling entirely. • Shared type contracts across Python workers and TypeScript clients with Pydantic schemas, cutting mismatches at service boundaries. Digital Agency • Evolved a Google AI Studio proof-of-concept into H2V2, a multi-tenant catering operations platform, setting the agency’s build standards and domain-driven design architecture. • Engineered the core sales-to-fulfillment pipeline using explicit state machines, snapshot-immutable quotes for billing integrity, and real-time WebSocket sync to kitchen terminals. • Refactored prototype flat files to PostgreSQL with Drizzle ORM across 11 schema migrations, decoupling domain queries into modular services and establishing a Playwright E2E and unit test suite for code quality

• Built two DeFi vault protocols (GLASS and DROP) for real-world asset investments, architecting Solidity smart contracts, backend APIs, and frontend dashboards from the ground up. • Implemented dual-token vault architecture (rebasing DROP + transferable wDROP wrapper) using UUPS upgradeable proxies, with granular role-based access control across admin, operator, capital deployment, and treasury functions. • Designed a cursor-based redemption queue for gas-efficient batch processing, paired with comprehensive Hardhat and Foundry fuzz test suites covering deposit, redemption, and admin flows. • Developed wallet-integrated frontend flows for deposits, redemptions, and transaction signing, with viem/ethers handling contract interactions. • Built a Ponder-based event indexer to sync on-chain vault state with off-chain databases, powering real-time portfolio views and admin reporting. • Built admin interfaces for capital deployment, reporting, and access control across both vault systems. • Accelerated smart contract development and testing using AI-assisted workflows and multi-agent tooling.

• Sole developer on Taxolio SaaS platform for US sales tax compliance—architected product, backend, frontend, Stripe payments, and marketing site from the ground up. • Designed and built the core Nexus Checker, a rules engine evaluating sales tax obligations across all 50 US states + DC, based on economic thresholds, transaction types, and filing requirements. • Built an interactive frontend with a D3-powered US states map, multi-step workflows, and responsive design using Next.js, Tailwind CSS, and shadcn/ui. • Designed and extended Supabase data models for tax thresholds, historical rule changes, and audit tracking. • Integrated Stripe for subscription billing, payment management, and webhook-driven state syncing. • Built the marketing site with CMS integration, SEO optimization, and analytics tracking. • Extended CI/CD pipelines with automated testing across unit, E2E, and database layers. • Shipped MVP to production as sole developer using AI-assisted workflows (Claude Code with multi-agent setups).

• Built tournaments, leaderboards, player progression, and quest systems serving 200 concurrent players using Next.js, TypeScript, and NestJS, ensuring high availability through real-time state sync and API orchestration across game sessions. Migrated Arcadia frontend from React to Next.js, reducing page load time by 50% and improving availability through server-side rendering and optimized code splitting. • Reduced leaderboard API response times and server load by 70% under high traffic by designing a Redis caching layer, cutting redundant calls during peak tournament activity. Designed and built a role-based CMS enabling non-technical teams to independently manage games, tournaments, and platform content, cutting developer dependency by 80% and reducing content deployment latency from hours to minutes. • Implemented hybrid authentication supporting traditional login and blockchain wallet connections (MetaMask, WalletConnect), serving both Web2 and Web3 users; later led the migration to RainbowKit to modernize the connection UX. • Built ERC-20 tournament gating and on-chain prize distribution flows using ethers.js, and integrated Biconomy for gasless transactions to reduce onboarding friction for non-Web3-native players. • Built marketplace interfaces for digital asset listings, transactions, and user inventory management using React and Ethers JS. • Built a gamified NFT character customization interface for Arcadians, enabling users to equip traits, preview combinations, and mint personalized characters; integrated the contract migration to ERC-1155 to support equippable marketplace items.