Freelance Full Stack DeveloperIndia · Remote

Web platforms
that hold up
under load.

Six years building and rescuing production systems — a deep-tech AI platform, a state education board serving 3,000 schools, and founders who needed one developer who could handle all of it. I take on the parts that are measured: page speed, query times, payment flows that have to clear.

Years building
06+
Projects shipped
20+
Start a projectSee the work
4.5s improved to 0.6s
Largest Contentful Paint — Bert Labs
60s improved to 1.2s
Query time on 1M+ records — BSMEB
+38%
Successful transactions — Hotel Patliputra

Selected work

All work →

Three problems, measured

Each of these started as something that was too slow, too fragile, or too manual to keep running. Full write-ups, not thumbnails.

2024Bert Labs · Deep-tech industrial AI

Bert Labs

A marketing site that loaded in under a second — and started ranking

4.5s0.6sLargest Contentful Paint

  • NextJs
  • Chakra UI
  • Contentful CMS
  • Vercel
Read the case study
Bert Labs interface
2022Bihar State Madrasa Education Board · Government

BSMEB Academic Portal

A results portal for 3,000 schools that stopped timing out

60s1.2sCore query response time

  • ReactJs
  • MySQL8
  • HTML5
  • CSS3
Read the case study
BSMEB Academic Portal interface
2025Dr. Ramesh Potnuri · Academic portfolio

Ramesh Potnuri Portfolio

A publication list a researcher can maintain without a developer

  • NextJs
  • Contentful CMS
  • Tailwind CSS
  • Vercel
Read the case study
Ramesh Potnuri Portfolio interface

Services

What I get hired for

Most engagements start with one of these five. If yours is a mix, that is normal — say so and I will scope it.

  • Web application development

    You need something built, and built to last.

    Production React and Next.js applications — the full thing, from data model to deploy. Scalable structure so the second year of changes costs what the first did.

  • Performance rescue

    Your site is slow and it is costing you traffic.

    Core Web Vitals work with a measured before and after. This is the one with the strongest track record: 4.5s to 0.6s LCP, and a 32% lift in organic traffic that followed it.

  • Platform and payments

    Transactions fail, and support absorbs the difference.

    Payment gateway integration and the reliability work around it — inventory that stays accurate, failures that release cleanly, and instrumentation so you can see which is which.

  • Security and compliance

    Procurement is asking questions you cannot answer yet.

    Authentication, encryption, secure session handling, and accessibility conformance — WCAG 2.1 AA, GDPR, SOC 2, CFR 21 — built in rather than retrofitted.

  • DevOps and CI/CD

    Deploying is a thing you dread.

    Dockerised pipelines, infrastructure as code with Terraform or Ansible, and a deploy that runs without you watching it.

  • Not sure which?

    Most projects are more than one of these.

    Describe what is going wrong and I will tell you what it actually needs — including when that is nothing I sell.

    Describe your project

References

People who hired me

Four clients and colleagues, named, with the roles they held when we worked together.

  • Keshav is a smart, dependable, and technically strong professional with sharp troubleshooting skills and up-to-date development knowledge. He's a fast learner who consistently delivers precise, solution-oriented results.
    Dr. Ramesh PotnuriLead Research Scientist, Bert Labs
  • Working with Keshav has been an inspiring experience — his deep technical knowledge and design sensitivity consistently elevate our UI/UX outcomes. He brings clarity, speed, and innovation to every collaboration.
    Nipun KrishnanUI/UX Designer, Bert Labs
  • Keshav was instrumental in building our IT infrastructure and developing our web systems from scratch. His technical expertise and dedication greatly enhanced our digital capabilities.
    Dr. Md. Noor IslamController of Examinations, Bihar State Madrasa Education Board
  • I was impressed by how quickly he understood our business needs and translated them into an intuitive web application. The custom features he developed have significantly streamlined our home automation system.
    KirsCo-founder, Homifii

About

Six years, three kinds of client

A deep-tech company, a government board, and founders. The through-line is systems that had to work while people were using them.

Keshav Kumar

I am a full stack developer working mostly in React, Next.js, and Node. What I am actually good at is the part after the build: finding why a page takes four seconds to render, why a query that was fine last year now times out, why a payment flow drops one transaction in five.

That work is measurable, so I measure it and publish the numbers. Every case study on this site leads with a before and after, and says where the figure came from.

I take on freelance engagements — new builds, performance rescues, and the platform work in between.

Experience

  1. Sep 2024 — Jun 2025

    Research Engineer II

    Bert Labs Bangalore

    • Built the frontend platform on Next.js 15 and Chakra UI; engagement rose 40% and session duration 25%.
    • Took Largest Contentful Paint to 0.6s and Lighthouse above 95.
    • Cut client-side vulnerabilities by 60% and reached WCAG 2.1 AA.
    • Held test coverage above 95% with Jest, deployed through Dockerised CI/CD.

  2. Aug 2021 — Aug 2024

    Full Stack Developer & Team Lead

    Bihar State Madrasa Education Board Patna

    • Led the team building web systems for 3,000+ schools.
    • Reduced query time on 1M+ record tables from 60 seconds to 1.2.
    • Integrated payment gateways: 30% higher success rate, 20% fewer failures.

  3. Aug 2019 — Jul 2020

    Full Stack Developer & IT Support

    Hotel Patliputra Continental Patna

    • Built the booking platform in PHP and MySQL; booking efficiency up 70%.
    • Improved database performance 35%, absorbing 3× the traffic.
    • Integrated CCAvenue payments; successful transactions up 38%.

  4. Jan 2016 — Dec 2020

    Integrated BCA & MCA

    Indira Gandhi National Open University Patna

    • Won the CSI State Level Web Development Competition.
    • Technical Head of the institution's coding club.

Stack

Frontend

  • React
  • Next.js
  • TypeScript
  • JavaScript
  • Chakra UI
  • Tailwind CSS
  • SASS

Backend & data

  • Node.js
  • Express
  • MongoDB
  • MySQL
  • REST
  • Contentful

Infrastructure

  • Docker
  • Kubernetes
  • Azure
  • Vercel
  • Terraform
  • CI/CD

Practice

  • Jest
  • React Testing Library
  • Core Web Vitals
  • WCAG 2.1 AA
  • Git

Writing

All posts →

Notes from the build

Contact

Tell me what
you're building.

I read every enquiry myself and reply within two working days. If the project is not a fit I will say so, and point you somewhere better where I can.

Or reach me directly