sushil kumar

I’m a results-driven Full Stack and Distributed Systems Engineer with 6+ years of experience building high-performance microservices, real-time IoT backends, and cloud-native APIs. I take ownership of the complete SDLC—from architecture design to production—especially across security, identity, and IoT domains.

I bring deep expertise in Python, Go, and AWS, with a strong focus on enterprise-grade security. From designing and enforcing an enterprise Content Security Policy (CSP) to implementing tamper-proof OTP authentication and JWT-based practices, I help teams reduce XSS/injection risk and harden identity surfaces.

I’m at my best when scaling real-world integrations. I’ve led a Slack integration that dispatches millions of notification and access requests daily with high reliability, and I’ve built gRPC services and WebSocket-based flash notification systems for low-latency, high-throughput workflows.

I also enjoy tackling complex platform problems end-to-end: architecting resilient IoT backend systems, designing a bidirectional device-sync engine using JSON Patch over MQTT, and coordinating production releases with rigorous code reviews and mentoring. Whether it’s migrating legacy infrastructure to an HA AWS stack or automating CI/CD with GitHub Actions, I aim to ship confidently, measure impact, and keep systems secure.