Full-Stack Software Engineer with 5+ years of experience building and operating production SaaS products and high-traffic web platforms with TypeScript, Node.js, NestJS, React, and Next.js.https://m-sinan.netlify.app/https://m-sinan.netlify.app/blog/multi-tenant-ownership-headers/https://m-sinan.netlify.app/blog/multi-tenant-ownership-headers/Trusting tenantId or workspaceId from a POST body is an IDOR waiting to happen. When header-based tenancy scoping is the right call — and how to implement it cleanly.Sun, 15 Mar 2026 00:00:00 GMThttps://m-sinan.netlify.app/blog/cache-stampedes-match-day/https://m-sinan.netlify.app/blog/cache-stampedes-match-day/How single-flight deduplication and stale-while-revalidate caching fixed MySQL connection-pool exhaustion during peak fantasy sports traffic.Mon, 20 Oct 2025 00:00:00 GMThttps://m-sinan.netlify.app/blog/resilient-ai-audit-pipeline/https://m-sinan.netlify.app/blog/resilient-ai-audit-pipeline/How we designed a multi-stage NestJS pipeline with deterministic LLM fallbacks, contract validation, and reproducible audit cycles for a local SEO SaaS.Fri, 15 Aug 2025 00:00:00 GMT