I'm Baran Dursun.
I build and ship data-heavy products.

Fragrance enthusiasts track their collections across scattered notes and spreadsheets, with no single place to identify a bottle, log what they wear, or see what friends are wearing.

Solo end to end: a 58-endpoint Node.js/Express REST backend with Redis caching behind a React Native (Expo) client — ~18K lines of TypeScript. Barcode scanning and free-text lookup run on PostgreSQL trigram (pg_trgm) search with a custom confidence-ranking layer over 63,751 fragrances across 1,772 brands and 1,861 scent notes; a content-based recommender ranks by IDF-weighted scent-note overlap scaled by brand-tier affinity.

Live on the App Store, shipped through CI with 528 automated tests and a schema-drift guard. A self-initiated security audit of the app in production uncovered a PII exposure in its auto-generated REST API — fixed at the Postgres grant/RLS layer with a regression test. Also ships B2B analytics endpoints designed for fragrance houses.

Canadian macro data is scattered across Statistics Canada and the Bank of Canada in incompatible formats, making it slow to combine indicators or reason about scenarios.

Ingests 9 indicators into a PostgreSQL medallion (bronze / silver / gold) warehouse, then runs VAR + XGBoost forecasting with Monte Carlo scenario bands behind a FastAPI + React dashboard. The interesting part was layering RAG natural-language Q&A over the same warehouse the numeric models read from.

Live, serving a composite health score, scenario forecasts, natural-language Q&A, and one-click PDF reports.

Feeds and news sites optimize for engagement, burying the signal under clickbait and the same story duplicated across sources.

A scheduled pipeline polls Finnhub, RSS feeds, and Hacker News, scores every article for relevance and clickbait with the Claude API, and renders a dense three-column broadsheet from Postgres. The whole thing runs as a single Railway service.

Live on Railway, regenerating the front page on a schedule.

Duplicate invoices, creeping vendor prices, and forgotten "zombie" subscriptions quietly drain accounts payable and rarely get caught by hand.

Integrates with QuickBooks and builds 90-day rolling statistical baselines per vendor to flag duplicate invoices, vendor price creep, and zombie subscriptions, with an LLM pass auditing individual invoice line items.

Live at auditap.it.com.