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Mridul Kumar

@alphainfinitus

Full-Stack Engineer | Scaled a Platform from 0 to 92M+ API req/mo TypeScript, React, Next.js, Node.js | AI Search & LangGraph

India

Message

What I'm looking for

I want to keep building from zero to scale, owning architecture, performance, and product impact.

I’m excited to apply LangGraph/LangChain to AI-augmented search and reasoning while collaborating with teams that value engineering excellence and fast iteration.

I’m a full-stack engineer with 5+ years shipping products from zero to scale. As the first engineer, I’ve architected end-to-end platforms and built the reliability, performance, and observability needed to grow rapidly.

At Polkassembly, I built the entire platform from scratch—API, database, and frontend—and scaled it to 97K monthly active users and 92M+ API requests/month. I implemented distributed Redis caching to cut response times from 2.3s to 0.4s, led migration of the full stack from Vercel/DigitalOcean to GCP with Docker, and delivered a real-time notification system with 3M+ alerts/month across five channels.

More recently, I’ve been focused on AI-augmented search and reasoning—designing multi-hop reasoning engines and hybrid retrieval systems with LangGraph. I’ve also led cross-functional teams of up to 12 engineers, built an AI-powered content moderation system to improve signal-to-noise, and negotiated $200K in GCP credits to extend runway.

Experience

Work history, roles, and key accomplishments

Current

Founding Full-stack Engineer

Current

Polkassembly

Jan 2021 - Present (5 years 5 months)

Built Polkassembly from scratch (API, database, and frontend) as first engineer, scaling to 97K monthly active users and 92M+ API requests/month with 99.98% crash-free sessions. Architected real-time notifications (3M+ alerts/month, 99.9% delivery) and distributed Redis caching that reduced API latency from 2.3s to 0.4s; led GCP migration and CI/CD standards.

TypeScript React Next.js PostgreSQL Google Cloud Platform Redis Docker Prometheus Grafana

Founding Lead Full-Stack Developer

PlusMinusedu

Jul 2020 - Dec 2020 (5 months)

Built an EdTech exam preparation platform from zero, handling database architecture, CI/CD, REST APIs, and a mobile-first frontend, scaling to 76,000+ users. Developed a custom CMS for LaTeX-rendered, multi-language question banks and integrated Stripe with dynamic pricing and discount logic for tiered subscriptions with real-time sales tracking.

Database Architecture CI CD REST APIs LaTeX Rendering Stripe Dynamic Pricing

React Web Speech Package Maintainer

React Web Speech

Created and maintained a production-ready React speech-to-text npm package with composable hooks for microphone permission management and cursor-aware text insertion. Shipped a tree-shakeable TypeScript-first (~5KB gzipped) implementation with zero dependencies, SSR safety, and cross-browser auto-recovery compatible with React 18 Strict Mode.

React TypeScript Mic Permission Management Cursor Aware Text Insertion SSR Safety Cross Browser Auto Recovery React 18 Strict Mode

Technical Founder (AI Data Explorer)

Blockpedia

Architected a multi-hop reasoning engine using LangGraph that converts natural-language queries into executable plans across static assets and REST/GraphQL. Built a hybrid retrieval system combining BM25 and vector search with Reciprocal Rank Fusion, and delivered a reactive Next.js UI streaming agent reasoning, token usage, and citations via Server-Sent Events.

LangGraph RAG BM25 Vector Search Reciprocal Rank Fusion Next.js GraphQL Server Sent Events