Projects

**What it is.** Full-stack AI meal-planning platform built as a pnpm monorepo and deployed on AWS. NestJS owns business logic while a separate Python FastAPI ai-service runs the AI brain. **AI generation pipeline.** The AI brain is a single tool-using agent orchestrated as a LangGraph StateGraph with a ReAct inner loop that calls a USDA lookup tool but never writes nutrition numbers itself; the server computes every macro from USDA ground truth, a hard anti-hallucination guarantee. Two complementary RAG systems serve different jobs — a lexical USDA RAG (Postgres full-text + Haiku reranker) grounds every macro, while a separate semantic recipe RAG (HyDE → text-embedding-3-small → pgvector HNSW + full-text fused with Reciprocal Rank Fusion → Haiku reranker, seeded from RecipeNLG via a LlamaIndex ingestion pipeline) feeds curated dish ideas into a retrieve_recipes node before generation. **Reliability & quality.** Quality is enforced by a 3-layer validate-and-retry cascade, and typed state is checkpointed to Postgres for crash-resume. Validated meals flow back into the recipe corpus through a guarded data flywheel, an offline eval harness with a CI gate catches regressions, and every generation is traced in self-hosted Langfuse. **Deployment.** Server-Sent Events stream meals live from Python → NestJS → Next.js, all running on AWS — ECS Fargate plus Lambda/OpenNext over RDS, ElastiCache, and CloudFront.

Solana DEX trading platform built as a two-part system: feels-web, a Next.js 16 trading SPA owned end-to-end, and feels-indexer, a Rust real-time indexer over a four-backend storage layer. The frontend ships real-time market data, wallet-connected swaps, and on-chain position management across 30+ components; the indexer deserializes on-chain Solana account and event data and exposes it over a documented REST surface. A two-lane Playwright E2E setup (deterministic test wallet + LiteSVM in-memory RPC) keeps full-stack runs fast and flake-free.

**What it is.** Government contracts intelligence platform over 4.2M federal contracts (PostgreSQL 16 OLTP) and 52M+ award rows (ClickHouse OLAP). **Data pipeline & ETL.** A custom ETL layer — three node-schedule-driven SmartSync services — ingests the SAM.gov Contract Awards API into PostgreSQL via idempotent composite-key upserts, materializes ~20 PostgreSQL materialized views, and mirrors the awards table into ClickHouse on a 6-hour cycle. Three overlapping sync layers plus a daily reconciliation job took SAM.gov restarts from ~3% record loss to zero data loss. **Analytics at scale.** The MV strategy (5 core pre-aggregations — agency, NAICS, geography, award type — covering ~80% of dashboard queries) cut p95 latency 25× (5s → <200ms) with no new infrastructure, while the ClickHouse columnar mirror serves no-filter analytics sub-50ms. **Deployment.** Next.js 15 ships on Cloudflare Workers (OpenNext) with ISR; the Express.js API and 3 SmartSync services run on Komodo bare-metal (Hetzner, Docker) behind 24+ GitHub Actions workflows on a self-hosted runner.

B2B Web3 platform for launching airdrop campaigns with decentralized governance, multi-chain transaction handling, and automated token distribution. NestJS backend manages campaign lifecycle and multi-phase voting, while Ethers.js handles on-chain execution across Ethereum and custom Hub blockchain via a unified Adapter pattern.

AI-powered Chrome Extension (Manifest V3) that automates web form filling using a self-validating multi-agent system. Three specialized agents — Planner, Navigator, and Validator — orchestrated by an Executor with shared AgentContext. Supports 8 LLM providers via LangChain with automatic structured output fallback. Built the VBON Form Explorer agent to reverse-engineer complex government forms (PrimeFaces/JSF) with 10K+ lines of HTML using stable hash-based IDs and deterministic DOM diffing.

Web3 e-commerce platform for brands to create and manage NFT campaigns — minting, secondary sales royalty tracking, and reward redemption via QR codes or wallet connections. Architected as a 7-service monorepo with event-driven workflow engine, 11 background daemons, and Stripe payment integration.

B2B SaaS platform for employee engagement — gamification, pulse surveys, peer recognition (shout-outs), rewards marketplace, and manager insights dashboards. Two codebases: React Native mobile app (Oxygen) with offline-first RTK Query caching and 5 Firebase integrations, and React web dashboard (Uptech) with 19 Ducks feature modules and atomic design component library.

Two enterprise SaaS products for a Canadian client. BIG v2: healthcare benchmarking platform where hospitals submit trial balance data and compare 100+ KPIs against peer groups — schema-driven report constructor, MobX state management, ag-Grid data tables, AWS Cognito auth. DIY Ads v2: self-service advertising platform with Symfony backend, Vue.js frontend, Stripe payments, and Jira ticket integration.

Multi-chain NFT marketplace supporting Concordium and Ethereum blockchains with full auction system, multi-wallet support, and real-time notifications. Go Fiber backend with 37 database entities, Protocol Buffer integration for Concordium smart contracts, STOMP WebSocket auctions, and white-label Universe system for custom marketplace instances.

Enterprise-grade live casino gaming platform with 20+ games, real-time betting via gRPC-Web streaming, and a 505-component design system. Three codebases: 953-file TypeScript business logic engine with Inversify DI, React 18 client with MobX + RxJS reactive state, and Storybook-documented component library with Pixi.js/Konva graphics rendering.