Md. Mizanur Rahman

Engineered high-concurrency authentication systems, custom database sync automation, and cross-platform identity governance within the global Allianz enterprise ecosystem.

• Authentication Latency: Reduced P99 latency from 4,500ms to <15ms during IdP SAML/OIDC key rotations with Promise Collapsing, collapsing 5,000+ JWKS calls into one fetch.
• Database Automation: Wrote SQL validation and synchronization scripts across unsAccountBInUnsGroupB tables, reducing 10+ daily tickets to zero and automating 84+ checks per ticket.
• API Reliability & Client Support: Engineered authorization state mapping across enterprise Person/Group registries, provided direct client-facing technical support, and resolved complex SSO, MFA, and OIDC access anomalies.

Led a 4-engineer team architecting fault-tolerant microservices, rate-limited queue processing, and Agentic AI integrations for multi-tenant enterprise platforms.

• SQS & DLQ: Prevented order loss during DHL Express downtime with AWS SQS and Dead Letter Queues while preserving instant 200 OK checkout responses.
• Traffic Control: Stopped SMTP bans and socket freezes under 10,000+ concurrent spikes using Redis batch processing capped at 30 emails per 30 minutes.
• Full-Stack Architecture & Product Delivery: Collaborated with Product Managers on user stories and sprint estimates while leading delivery of the RM Auto ecosystem with NestJS, Next.js, MUI/AntD, Docker, Agentic AI tools, and Stripe.

Architected scalable NestJS microservices, optimized database query execution, and implemented Redis caching for a high-traffic digital healthcare platform.

• Tuned MySQL queries and MongoDB Aggregation Pipelines with Redis caching to lower peak read latency.
• Developed multi-tenant NestJS services on AWS EC2/S3 with secure isolation, RBAC, and automated media pipelines.
• Containerized NestJS microservices with Docker and built AWS CI/CD pipelines and automated cron schedulers, ensuring 99.9% uptime.