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Avanish Jha · Portfolio · Volume 04 · MMXXVI
● Java Full Stack Developer · Mumbai

@Singleton dev.
Does it all.

I build software the way it should've been built the first time. No duct tape. No shortcuts. No "we'll fix it later."

From system architecture to the last edge case, I own the whole thing. Give me a complex requirement — fintech, government, whatever — and I'll give you something that scales, holds up, and doesn't embarrass you at 2am.

View work ↗ Get in touch ↗ View CV
i A real Java backend booting from cold start in about a second — what an API looks like the moment it wakes up.
2026 · Vol. 04 · Mumbai
~30%Faster APIs
4Live products
0Prod incidents
02 · How a request travels

Backends I'd trust at 3am.

What lives behind every API call on Fifty Villagers — TLS termination, RBAC checks, indexed queries, HMAC-verified webhooks, and an audit log that never lies. Animated below, in real time.

p99 · 142ms · uptime 99.96%
POST /api/payment/verify · live trace
Browser Nginx · TLS Spring Boot @RestController · JWT · RBAC PostgreSQL Razorpay HMAC
— Status200 OK
— Latency14ms
— AuthJWT · RBAC
— VerifiedHMAC SHA256
03 · Index

A short note on how & why.

I build scalable enterprise systems with Spring Boot and ship modular UIs in Angular, React, and Next.js — backend logic first, UX a close second.

— Profile

Java Full Stack Developer based in Mumbai. By day I architect REST APIs and security layers at CMS Computers India on the Incident Management System and Energy Meter Configuration Portal. By night I freelance — most recently a PERN-stack education SaaS for Fifty Villagers and a production site for Prince Ambulance Services.

I care about the same things on every project: clean RBAC, indexed schemas, predictable APIs, and a frontend that doesn’t ship a megabyte of JavaScript when 30kb will do.

B.Tech in Electrical & Computer Engineering from Amrita Vishwa Vidyapeetham. Currently in the IIT Madras AI/ML Foundation Program. Open to freelance and full-time roles in 2026.

04 · Selected Work

Recent chapters.

Tap to call · 24×7
02 / Healthcare · Web2026 · New
Prince Ambulance Services — a fast booking site for emergency response.

Mobile-first, sub-second LCP, click-to-call front-and-centre. Built to convert in seconds when seconds matter.

Mobile-firstSEOClick-to-call
princeambulanceservices.in.net
06 / Open source & side projectsOngoing
More on GitHub — Spring Boot starters, MERN experiments, and small tools that scratch a real itch.
JavaTypeScriptPythonBashSQL
github.com/avanishjha  ·  browse repos
05 · Technologies

Tech I reach for, daily.

Over five years across enterprise and freelance work, this is the kit I trust to ship — tools that survive production, not just demos. Hover any badge.

Languages / 04
Java
TypeScript
JavaScript
Python
Backend / 04
Spring Boot
Hibernate
Node.js
Express
Frontend / 04
React
Next.js
Angular
TailwindCSS
Databases / 03
PostgreSQL
MySQL
MongoDB
DevOps & CI/CD / 05
Docker
Nginx
Jenkins
GitHub Actions
Git
Tools & Services / 05
Keycloak
Razorpay
Postman
Maven
IntelliJ IDEA
25tools, daily 5+years shipping 4live products
…and a few more I haven't bothered listing.
06 · Engagements

How we'd work together.

I take on a small number of projects each quarter so I can stay hands-on on each one. Three shapes work best — pick the closest fit, and we'll tailor it on the call.

A·J
01 / Backend4 — 8 wks

Spring Boot APIs, built right.

From a clean slate or grafted into your existing platform — designed, hardened, documented, and handed over with tests and a Postman collection.

  • REST API design, JWT / Keycloak auth, RBAC
  • Postgres / MySQL schema with migrations
  • Docker + CI/CD on your VPS or cloud
  • Razorpay / Stripe / HMAC-verified webhooks
Fixed scope · 4 — 8 wksOn request
02 / Full-stack6 — 12 wks

End-to-end MVP build.

Backend + frontend + deploy, shipped solo. Right when you need to validate something fast and don't want a four-person consultancy on the budget.

  • Spring Boot or Node API + Postgres
  • Next.js / Angular frontend, designed too
  • Auth, payments, basic admin, audit log
  • Production deploy + handover doc
Project · 6 — 12 wksOn request
03 / Audit1 wk · fixed fee

Performance & security audit.

A focused week on your existing API or app. You get a written report, prioritised fixes, and the option to retain me to land the top three.

  • API latency profile · query plans
  • Hibernate / ORM N+1 hunt
  • Auth + RBAC + secret hygiene check
  • Quick-win patch list, ranked by effort
Fixed scope · 1 wkOn request
A kind word
Avanish shipped a real product, not a prototype. He thought about the audit log and refresh-token edge cases on his own — that's rare in a freelance hire.
F
Founder · Fifty Villagers Education NGO · Mumbai
— A short note Vol. 04 · MMXXVI
07 · Path

A short résumé, in plain English.

Aug 2024 — NowMumbai

Java Full Stack Developer — CMS Computers India

Building enterprise modules under the Incident Management System. Owned Designation Management, Escalation Report, Hierarchy and Zone Mapping with full RBAC. Hardened SecurityConfig.java and reduced API response times by ~30% through query and serialisation fixes.

Spring BootAngularHibernateMySQLKeycloakJasperReports
2024 — LiveFreelance · Remote

Freelance Full Stack — Fifty Villagers

Shipped and now maintain a production PERN-stack education SaaS with multi-tier RBAC. JWT refresh-token auth, rate limiting, HMAC-verified Razorpay webhooks, and a 17-migration Postgres schema with audit logs — running on a hardened VPS via Docker, Nginx, SSL and GitHub Actions CI/CD.

PERNPostgreSQLJWT · RBACRazorpayDockerNginx · CI/CD
2026Freelance · New

Freelance Web — Prince Ambulance Services

Designed and shipped princeambulanceservices.in.net — a fast-loading, mobile-first booking surface for an emergency healthcare service that needs to convert in seconds, not minutes.

Mobile-firstSEOClick-to-callSub-second LCP
2020 — 2024Coimbatore

B.Tech Electrical & Computer Engg. — Amrita Vishwa Vidyapeetham

CGPA 7.86 / 10.00. Currently extending the foundation with the IIT Madras AI/ML Foundation Program, plus certificates in Java Full Stack Development and Spring Boot Microservices.

CGPA 7.86IIT Madras AI/MLJava · Spring certs
Open to freelance & full-time roles · 2026

Let’s build
something solid.

avanishjha2011@gmail.com
Book a 15-min call Download CV (PDF) — Replies within 24h IST

Elsewhere

GitHub ↗ LinkedIn ↗ Fifty Villagers ↗ Prince Ambulance ↗

Based

Mumbai, Maharashtra

Remote-friendly · IN/Worldwide

UTC +05:30

+91 8010 701 354

Engagements

Spring Boot APIs · 4–8 wks

End-to-end MVPs · 6–12 wks

Performance audit · 1 wk

See full breakdown ↗

Currently

Building: PoolUp v2.0

Shipping: IMS modules @ CMS

Maintaining: fiftyvillagers.org

Studying: IIT Madras AI/ML