Sachin Kizhakkepurath

I’m a Full-Stack Software Engineer with 2.5+ years of experience building production fintech systems and multi-tenant business platforms. I focus on ownership across system design, implementation, and iteration—especially where performance, reliability, and security matter.

At Paywint, I scaled an Angular 18 standalone SPA to 330+ components and 25+ lazy-loaded modules using signals-first architecture and OnPush change detection. I built a multi-modal payment engine supporting 6 channels and 24 transaction lifecycle states, with real-time updates via WebSockets (Pusher), consolidating fragmented tools into a single auditable workflow.

I’ve also shipped embeddable fintech products: a white-label embeddable SDK (iframe + JS snippet) using a secure postMessage bridge for cross-origin communication. Integrating Plaid for bank linking and ACH origination, I abstracted OAuth and iframe flows into reusable Angular services while hardening authentication with JWT silent refresh, device fingerprinting, rate-limited auth, and defense-in-depth for financial transactions.

Beyond fintech payments, I build admin and operational platforms end-to-end. I developed a real-time fuel inventory dashboard and shift-based reconciliation that reduced audit time by 30–40, and I’ve automated reporting workflows with Puppeteer. My Tesseract project pairs a NestJS/Prisma backend with an Angular 21 analytics admin and a Flutter outlet app, including real-time Socket.IO events, transactional billing, and multi-stage warranty lifecycle tracking.