Abhi Sharma.
21y/o backend-obsessed full-stack engineer.Building backend systems, notes, and useful little tools.
I mostly build backend-heavy product work: Node.js services, PostgreSQL schemas, Redis/BullMQ queues, LangGraph workflows, and technical notes on systems I'm learning.
Skills.
TypeScript
JavaScript
Python
React
Next.js
Tailwind CSS
Node.js
PostgreSQL
MongoDB
Redis
Elasticsearch
Supabase
Firebase
Prisma
Sequelize
Kafka
AI SDK
Azure
Docker
Nginx
Cloudflare
Vercel
GitHub Actions
Ubuntu
Playwright
Postman
Express
Socket.io
LangGraphTinkering.
Side projects, experiments, and things I've shared publicly.
BetterMail — the project that lived and died in the best way
Built an AI email client on a borrowed Visa card after getting fired. 100+ users, 1.4K visitors, and a live reaction from Piyush Garg — then killed by a $1,500 Google security assessment. Zero regrets.
Node.js
BullMQElasticsearchLangGraph
Azure OpenAI
Made my PostgreSQL queries 8.5× faster with connection pooling
Dug into how PostgreSQL connections actually work — TCP handshakes, session creation, per-request overhead. Swapped naive connections for a pool and got 8.5× faster queries. Covered PgBouncer and why every production system needs it.
PostgreSQLNode.jsConnection PoolingPgBouncerBackend
Recorded a 45-slide backend development masterclass
45 slides on backend fundamentals — databases, SQL vs NoSQL, ORMs, client-server architecture. Not for the views. Built it to make sure I understood it well enough to explain it.
Node.jsPostgreSQLMongoDBBackend Engineering
Why does Promise.then() run before setTimeout()?
A three-line JS snippet gave me the wrong output and I couldn't explain why. Went all the way down — call stacks, Web Workers, task queues, microtask queues, the event loop. Now I know exactly why Promise.then() always beats setTimeout.
JavaScriptEvent LoopMicrotasksPromises
Browser Internals