Engineer Resume

MD. Mizanur Rahman

Full-Stack Software Engineer

Full-stack and backend engineer with 4+ years of experience architecting high-throughput microservices, multi-tenant APIs, enterprise identity security systems, and production AI integrations.

sohanjs.bd@gmail.com +8801609456583 mrsohan.netlify.app linkedin.com/in/mizanurrahman github.com/SohanR

4,500ms to <15ms P99 authentication latency reduction

4+ years IAM, backend, and full-stack engineering

4-member development team led through SDLC

10,000+ concurrent traffic spikes controlled

Summary

Full-Stack & Backend Software Engineer: 4+ years of experience architecting high-throughput microservices, multi-tenant backend APIs, and responsive web applications using Node.js (NestJS/Express), React, Next.js, Modern UI (MUI/AntD), and TypeScript.
Database & Performance Optimization: Deep production expertise in SQL (MySQL/PostgreSQL) and NoSQL (MongoDB) schema design, MongoDB Aggregation Pipelines, Redis caching, event-driven queue architectures (AWS SQS), and high-concurrency request optimization.
Cloud Infrastructure, DevOps & AI Integration: Skilled in Docker, Nginx, automated CI/CD pipelines, AWS (EC2, S3), and Agentic AI tools including Claude Code and OpenAI APIs.
Polyglot & Adaptive Mindset: Enterprise production experience spanning Java (Spring Boot), One Identity Manager, ForgeRock, and cross-platform API integrations, with a proven ability to master new tech stacks on demand.

Technical Depth

IAM & Governance One Identity Manager, ForgeRock, Identity Lifecycle Management, Access Control, RBAC

Distributed Systems AWS SQS, RabbitMQ, DLQ, Promise Collapsing / Singleflight, Redis rate limiting

Frontend Engineering TypeScript, JavaScript, React, Next.js, React Native, MUI, Ant Design, Tailwind CSS

Backend Architecture Node.js, NestJS, Express.js, Java, Spring Boot, REST APIs, Microservices, Multi-Tenant Architecture

Data Engineering MongoDB Aggregation Pipelines, PostgreSQL, MySQL query tuning, Redis caching

Cloud, DevOps & AI AWS EC2, S3, SQS/DLQ, Nginx, Ubuntu, Cloudflare, CI/CD, Agentic AI, OpenAI APIs

Leadership Technical mentoring, Agile/Scrum, systems architecture, cross-functional delivery

Experience

K53 Technology Solution

Full-Stack Software Engineer, IAM Team | Client: Allianz Australia

June 2024 - July 2026

Auth latency: Reduced P99 latency from 4,500ms to <15ms during IdP SAML/OIDC key rotations by implementing Promise Collapsing in Node.js, collapsing 5,000+ JWKS calls into one in-flight fetch.

Database automation: Built automated SQL validation and synchronization across unsAccountBInUnsGroupB tables, eliminating a 10+ daily ticket backlog and automating 84+ non-production 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 anomalies.

Provided direct client-facing technical support across the global Allianz enterprise ecosystem.

Dotpot iT

Technical Team Lead / Full Stack Developer

June 2023 - June 2024

Fault tolerance: Prevented order loss during DHL Express downtime with an asynchronous AWS SQS queue and Dead Letter Queues while preserving instant 200 OK checkout responses.

Traffic control: Eliminated SMTP bans and Node.js socket freezes under 10,000+ concurrent spikes using Redis batch processing capped at 30 emails per 30 minutes.

Full-stack architecture & product delivery: Led a 4-engineer agile team, collaborated with Product Managers on user stories and sprint estimates, and built the multi-tenant RM Auto ecosystem with NestJS, Next.js, MUI/AntD, Docker, Agentic AI tools, and Stripe.

Owned architecture and delivery through the full SDLC for multi-tenant enterprise platforms.

Experience Continued

Zaynax Health

Backend Developer

Feb 2022 - Oct 2022

Database performance: Tuned complex MySQL queries and MongoDB Aggregation Pipelines with Redis caching to reduce latency across high-volume reads.

Cloud architecture: Developed multi-tenant NestJS services on AWS EC2/S3 with secure data isolation, RBAC, and automated media pipelines.

System automation & cloud operations: Containerized NestJS microservices with Docker and built AWS CI/CD pipelines and automated cron schedulers, ensuring 99.9% uptime.

Key Proficiencies

Backend & APIs: Node.js (NestJS, Express.js), REST APIs, Microservices, Multi-Tenant Architecture, Java (Spring Boot), Message Queues (AWS SQS, RabbitMQ).

Frontend & UI: TypeScript, React.js, React Native, Next.js, Modern UI Libraries (MUI, AntD, Tailwind CSS), State Management (Context API, Redux Toolkit, React Query, Zustand).

Databases & Caching: MongoDB (Data Modeling & Aggregation Pipelines), PostgreSQL, MySQL, Redis (Caching & Rate Limiting).

DevOps, Infra & Security: Docker, AWS (EC2, S3, SQS/DLQ), Nginx, CI/CD Pipelines, Ubuntu, Cloudflare Monitoring.

AI & Workflow Automation: Agentic AI Tools (Claude Code, Gemini CLI, OpenAI APIs), Prompt Engineering, Automated Refactoring.

IAM & Governance: One Identity Manager, ForgeRock, Identity Lifecycle Management, RBAC, Active Directory, SSO, MFA, OAuth2, OIDC, SAML, JWT.

Leadership & Operations: Systems Architecture, Technical Team Leadership, Agile/Scrum, Product Manager Collaboration & Sprint Planning.

Education

Stamford University Bangladesh

B.Sc. in Computer Science & Engineering

2018 - 2021

Undergraduate thesis: QUINN, a blockchain-based cryptocurrency case study. Built and deployed a fixed-supply ERC-20 token and ICO crowdsale contract using Solidity and Hardhat.

Language

Fluent in both Bengali and English.