AM
Backend Systems Engineer

Ajay
Mandal

Backend / Distributed Systems / APIs

Architecting high-performance distributed systems, microservices, and APIs that scale to millions. Obsessed with reliability, latency, and elegant code.

View Projects →Get In Touch
ajay@portfolio ~ system.status
Ajay Mandal
UPTIME: 99.99%
P99: 11ms
2+
Years Eng.
TypeScript✦NestJS✦PostgreSQL✦Redis✦Docker✦Kubernetes✦GCP✦AWS✦Prisma✦BullMQ✦Next.js✦Python✦Prompt Engineering✦Vapi✦Puppeteer✦Supabase✦Node.js✦TypeScript✦NestJS✦PostgreSQL✦Redis✦Docker✦Kubernetes✦GCP✦AWS✦Prisma✦BullMQ✦Next.js✦Python✦Prompt Engineering✦Vapi✦Puppeteer✦Supabase✦Node.js✦
2+Years Engineering
YR
5+Projects Shipped
SYS
94.7%Uptime Record
UP
3Countries Served
GEO
01

Core Stack

⬡
Backend Engineering

NestJS, Node.js, Express, Hono. REST. API gateways, rate limiting, versioning, and event-driven architectures.

Expert95%
◈
AI & LLM Systems

OpenAI, Anthropic, OpenRouter. RAG pipelines, vector search, MCP servers, agent-to-agent workflows, and production LLM integration.

Advanced88%
◉
Databases & Storage

PostgreSQL, Redis, MongoDB, Supabase. Query optimisation, vector DBs, indexing strategies, and ORM design.

Expert92%
▦
Cloud & DevOps

GCP, AWS, Docker, Kubernetes. CI/CD pipelines, observability stacks, serverless functions, and infra-as-code.

Advanced84%
⬕
Distributed Systems

BullMQ, pub/sub messaging. Job queues, retry logic, exactly-once semantics, and fault-tolerant service design.

Advanced86%
◫
Security & Auth

OAuth 2.0, JWT, Auth.js, Zod. Input validation, secrets management, RBAC, and zero-trust architecture patterns.

Advanced82%
02

Selected Work

FEATURED · 2026

DryMDF

Production-grade Markdown-to-PDF platform with Next.js and NestJS. Features a rich editor, live PDF preview, async export, Mermaid diagrams, and scalable job queue — engineered for high-quality document workflows.

NEXT.JSNESTJSREDISTAILWINDCODEMIRRORBULLSOCKET.IOPUPPETEER
Markdown
EDITOR
PDF/HTML
EXPORT
Mermaid
DIAGRAMS
Live
PREVIEW
BACKEND · 202402

Youtube Clone

Full-stack video platform built with Next.js, Firebase, and Google Cloud. Features chunked video uploads, adaptive streaming, user authentication, and a recommendation feed — engineered to handle large media pipelines at scale.

NEXT.JSFIREBASEGOOGLE CLOUDFFMPEG
EDGE PLATFORM · 202403

NoteMe App

Edge-native blog publishing platform powered by Next.js, Hono, and Cloudflare Workers. Delivers sub-50ms response times globally with zero cold starts, Markdown rendering, and a clean authoring experience.

NEXT.JSHONO.JSCF WORKERSEDGE RUNTIME
E-COMMERCE · 202504

E-Commerce and Admin Dashboard

Production-grade e-commerce system with a decoupled storefront and a custom admin dashboard. Built on Next.js, Typescript, and PostgreSQL — with Stripe integration, real-time order tracking, analytics, and full product lifecycle management.

NEXT.JSPRISMA ORMPOSTGRESSTRIPEZUSTANDTAILWINDCSS
03

From the Blog

All Posts →
Findings
Dec 10, 2024

Zustand for state management in React.js

Simplify React state management with Zustand - A modern, lightweight alternative to Redux with zero boilerplate, TypeScript support, and atomic state updates for performant applications

Read Article →
Findings
Dec 10, 2024

Google OAuth Service

Master OAuth 2.0 authentication with Google Cloud Platform - A comprehensive guide to integrating GCP OAuth services into your applications with secure credential management and consent flows

Read Article →
Project Blog
Nov 9, 2024

In-house Authentication Using Auth.js v5 in Next.js

Build production-ready authentication systems with Auth.js v5 - Complete implementation guide featuring OAuth providers, JWT sessions, email verification, and Prisma integration for Next.js applications

Read Article →
04

Interactive Terminal

Type a command below to learn more about me — try help

ajay@portfolio:~ — bash
ajay@portfolio:~$ ./welcome.sh
╔════════════════════════════╗
║ Welcome to Ajay's Portfolio ║
╚════════════════════════════╝
Backend Engineer · Distributed Systems · APIs
→ Type help to see available commands
ajay@portfolio:~$
ajay@portfolio:~$
Commands: help · about · skills · experience · contact · whoami · social · clear
05

Let's Build

Drop a line

ajaymandal.work07@gmail.com

→ Response within 24 hours · Open to full-time & freelance

04
22Google Calendar
Book a Slot

No forms, no friction.
Pick a time that works for you and let's talk.

Available · Remote
Schedule a Meeting →

Opens Google Calendar · Free · 30 min