Each case study starts with the business problem, makes my ownership explicit, and shows the engineering decisions that kept the system correct in production.
Two Next.js web apps and two Expo mobile apps share auth, UI, server actions, and product logic through a Turborepo monorepo.
Versioned prompts and batch jobs across four providers with automatic fallback, validation, and repair. A full-day, 30-person workflow first fell to two reviewers in under an hour and now runs without routine manual handling.
Prevented double-payouts by treating gateway failures by certainty: release funds only on a provable failure; keep ambiguous transfers pending until webhook / status-reconcile / admin resolves them.
Ably multiplayer with scoped client tokens, server-authoritative scoring, atomic double-score prevention, and coordinator failover.
Resumable timed attempts, server-authoritative scoring, section-wise analytics, and disconnect recovery for roughly 500 simultaneous exam takers at peak.
Redis failures made survivable with typed cache keys, singleflight stampede protection, negative caching, and circuit-breaker fallbacks.
Two Expo apps add native push, Face ID app lock, deep links, haptics, store-safe payment handling, and shared hybrid screens over the web products.
Two exam-prep products, AfterBoards for IPMAT and CUET and AfterGrad for CAT, delivered as four production apps on one 17-package monorepo. Used by tens of thousands of learners, with 100,000+ submitted and analyzed exam attempts. Run end to end by one engineer.
A 3D-printing shop that used to price every custom job by hand. Customers upload an STL, the browser works out the volume and quotes it, they pay. Staff run the catalog, pricing and orders without me.
next.js · postgres · three.js · cashfree · r2An open-source platform over the WhatsApp Cloud API. Inbox, broadcasts, templates, flows, analytics. It runs entirely in the browser on encrypted local storage, so your customer conversations never touch my server, or it syncs to your own Postgres. AGPL.
next.js · indexeddb · web crypto · open sourceA family road-transport business that ran on paper LR books and spreadsheets. Now it runs on this: lorry receipts, GST and TDS billing, payments, expenses and a customer portal. Getting the tax and the ledger right was most of the job.
next.js · postgres · puppeteerA pharma wholesaler wanted retailers ordering from their phones, but would not give up ProfitMaker. So a Windows agent reads the ERP, never writes to it, and drafts bills through the same screen the staff already use. The ERP stays the source of truth.
next.js · postgres · tauri/rust · erp syncA Chrome extension and local library that captures saved reels, tags them with AI, and makes them searchable. Built because I kept saving things I could never find again.
mv3 · next.js · groqThis site. A public portfolio and blog, plus a private auth-gated dashboard I use to run my own week.
next.js · velite · drizzleI shipped every entry above solo or as the founding engineer. The 100k+ figure counts submitted and analyzed attempts in the AfterBoards and AfterGrad exam engine, not a portfolio-wide total.
Have a product to build or a difficult system to untangle? Let’s talk.
hi@himture.dev