Shahab U.

Senior backend engineer. 7+ years building web products. 3+ years as the core backend dev on a production B2B SaaS CRM. I work with SaaS founders and product teams who need someone to own the backend — not just complete tickets. ──────────────────────── WHAT I'VE BUILT IN PRODUCTION ──────────────────────── ✦ CRM backend Contact & deal lifecycle, stage management, custom fields, activity tracking, advanced search and filtering. ✦ Scheduling & calls system Booking flows, calendar sync, reminders, call outcomes — integrated with Google Calendar and Zoom. ✦ Real-time features WebSocket-based live updates, notifications, and event delivery. ✦ Background processing Async job queues and scheduled tasks for reminders, data syncing, and time-sensitive workflows. ✦ API controls Rate limiting, scoped API keys, pagination, OpenAPI documentation. ✦ Billing & user management Subscriptions, role-based access, multi-tenant isolation, admin controls. ✦ Security hardening Session fixes, unauthorized access remediation, abuse protection. ──────────────────────── INTEGRATIONS I'VE SHIPPED ──────────────────────── Zapier · Stripe · Google Calendar · Gmail · Zoom · RingCentral · WhatsApp Business · Calendly · Pipedrive · Close ──────────────────────── TECH STACK ──────────────────────── Node.js · TypeScript · PostgreSQL · Prisma · Redis · React · Redux · AWS (EC2, SQS, Lambda) · MongoDB · WebSockets · REST APIs · OpenAPI ──────────────────────── If you're building a SaaS product and need a backend engineer who takes real ownership — let's talk.