Backend developer for APIs that stay fast under load

I design and build the backend that apps depend on: APIs, microservices, databases, queues, data pipelines and the monitoring that keeps them healthy. I've cut API latency by 30% and database load by 40% on a coffee chain's high-traffic apps.

Discuss your project WhatsApp +91 94145 84444 contact@gajrajshekhawat.com

01 What I do

How I can help

APIs & microservices

REST APIs and services in Node.js (Express, Fastify, NestJS) or Python (FastAPI), with authentication, rate limits and tests.

Databases & performance

PostgreSQL, MySQL and MongoDB schema design, indexing and query tuning, plus Redis caching when speed matters.

Queues, jobs & integrations

Background jobs with BullMQ/Redis, payment gateways (Razorpay, Cashfree), WhatsApp and SMS OTP, GST invoices, webhooks.

Data pipelines & dashboards

Apache Airflow pipelines into BigQuery and Metabase dashboards, so your team can finally see its numbers.

  • Node.js
  • Express
  • Fastify
  • NestJS
  • Python
  • FastAPI
  • PostgreSQL
  • MongoDB
  • Redis
  • BullMQ
  • Airflow
  • BigQuery
  • OpenTelemetry
  • Kubernetes

02 Proof

Recent work in production

Real products for real organisations. See all work →

Pickup Coffee · 500+ stores

Data platform (Airflow, BigQuery, Metabase) and backends for the customer app, barista tablet app and back office. 30% lower API latency.

pickup-coffee.com

Equiti · global trading platform

Engineering for Equiti Group's multi-asset trading platform, at Shuru Technologies.

www.equiti.com

Competishun · JEE/NEET coaching

Backend of an online learning platform used by thousands of students at once: live classes, tests, payments.

competishun.com

Neem Karoli Sales · ordering platform

Two Android apps, web admin and API for a wholesaler, built solo: OTP sign-in, Cashfree payments, GST invoices, 1,290+ tests.

neemkarolisales.in

03 Process

How we'll work together

  1. 01Call

    We talk through the problem and I suggest the simplest thing that solves it.

  2. 02Plan

    A clear scope, timeline and fixed quote. No surprises.

  3. 03Build

    Weekly demos on a live link, so you see progress as it happens.

  4. 04Launch

    Deployed, monitored, documented, and supported after launch.

04 FAQ

Common questions

Which backend languages does Gajraj use?

Mainly Node.js/TypeScript (Express, Fastify, NestJS) and Python (FastAPI), with PostgreSQL, MongoDB, MySQL and Redis.

Can he make a slow API faster?

Yes. On Pickup Coffee's apps he cut API latency by 30% and database load by 40% with query tuning, indexing and Redis caching, and set up tracing to find bottlenecks.

Can he build data pipelines and dashboards?

Yes. He built Pickup Coffee's data platform: Airflow pipelines from Google Cloud Storage into BigQuery and Metabase dashboards for the marketing team.

Let's talk about your project

Tell me what you need. I usually reply within a day.

Send a message WhatsApp +91 94145 84444