बिहार–नेपाल सीमाBIHAR–NEPAL BORDERwhere the line starts

Hi, I'm Abhiraj. I build the backend that keeps working at 3am.

I grew up in a small town on the Bihar–Nepal border, where nobody I knew had internet at home. So as a kid I rooted an old Android phone, figured out how the Wi‑Fi networks around town worked, and got my friends and me online for free. I didn't know it was called hacking. I just knew I'd made something work that wasn't supposed to.

Today I'm a backend-heavy full-stack engineer in Hyderabad. I design systems, direct coding agents to build them, and own the review, testing and rollout myself.

3+ yrsshipping to production
Top 0.16%CodeChef, 38 of 22,573
1,200+students taught live
My route wasn't a straight line. Hop in.
Diyas along the water at Chhath Puja in Jaynagar
Chhath Puja back home in Jaynagar
Abhiraj walking with a backpack
फगवाड़ाPHAGWARA2019 – 2023 · LPU

Four years of computer science, and a lot of contests at midnight.

When I picked a B.Tech in Computer Science, I had never heard the word coding and didn't own a laptop. I got both at Lovely Professional University. Competitive programming taught me to think fast under a timer.

Somewhere along the way I started teaching too: live sessions and tutorials on Code with Newton for 1,200+ students, plus beginner projects and guides on GitHub and YouTube.

Before my final year began, I landed a year-long internship at MAQ Software in Hyderabad, so I spent fourth year shipping software instead of sitting in class.

Scoreboard

  • 0.16%CodeChef July Challenge, rank 38 of 22,573
  • 4.6%CodeChef June Challenge, rank 1,340 of 28,907
  • 8.4%LeetCode Weekly Contest 320 (8.6% in 329)
Looking up at a red-brick LPU hostel block
My LPU hostel block. I captioned it “Home”.
बेंगलुरुBENGALURUJun 2023 – Feb 2024 · Jaza Software

First full-time job: make a React Native app feel fast.

At an early-stage startup I built a TV dashboard for Android TV, a responsive feed and a custom in‑app camera. Then I benchmarked React Native UI libraries and led the migration to a faster one.

  • React Native
  • Android TV
  • Performance
+500%app performance after the UI library migration
−40%rendering time
−30%feed load time
2×faster video processing with a custom camera
हैदराबादHYDERABADMar 2024 – Jan 2025 · Inncircles

Where I moved to the backend.

I designed REST APIs in Node.js and Express with validation, centralized error handling, JWT auth and Mongoose models. On the frontend I built a drag-and-drop form builder that 100+ users relied on.

  • Node.js
  • Express
  • MongoDB
  • React
  • Tailwind
−50%time to build a form
−40%form completion errors
+35%monitoring accuracy, from aggregation pipelines
ज़ेटा जंक्शनZETA JUNCTIONApr 2025 – now · SDE II

Now: the systems SREs use while production is on fire.

I built the LLM pipeline inside Hippo, Zeta's Microsoft Teams incident bot. During a live incident it drafts customer updates on a schedule set by severity. An LLM validator checks each draft and can regenerate it up to 3 times, then an SRE approves it. The update is published exactly once, even with several replicas running.

I also built SaaS Navigator, a multi-tenant SRE console across production zones, frontend and backend, and wrote 80% of the frontend app's commits.

595tests for 37 requirements, 11 bugs caught before release
~50%less load on a shared Postgres, from one index
140 → 8CI failures after fixing 24 bugs in 4 services
10agent skills built for the team's shared repo
Try it: run an incident drill
  1. Incident opens. Next update due in … min
  2. Azure OpenAI drafts the customer update
  3. LLM validator checks the draft
  4. SRE approves in Teams
  5. Published once across replicas
Pick a severity to start.
रात की पालीNIGHT SHIFTthings I build after work

After 7pm I ship my own products.

Each one is in production or close to it, with real infrastructure: auth, payments, migrations, app store releases.

Vaani

Chrome extension · reads any page aloud

An LLM rewrites a page into natural speech and explains code instead of reading out symbols, with highlighting synced to the voice. It speaks English, Hindi and Hinglish. It has a backend with Google sign-in, usage metering and a shared Postgres cache.

  • Chrome MV3
  • TypeScript
  • Node
  • Postgres
  • LLM + TTS

Omoi

Mobile app · private notes with memory

A private notes app with a biometric vault and AI memory that finds what you meant, not only what you typed. Built for both iOS and Android, with over-the-air updates.

  • React Native
  • Expo
  • NestJS
  • Prisma
  • Postgres

Vyana

Mobile app · cycle health

A menstrual-health app that is live with real users. I built the Expo app and the Node backend, and I run its production database, releases and incident fixes.

  • Expo
  • Node
  • Postgres
  • Supabase

Heatwave

Open source · checks AI-written code

A protocol for AI-written code: plan, build, review and prove, with the planner, builder and reviewer kept as separate agents so no agent grades its own work. It works with Claude Code, Codex, Gemini CLI and Cursor.

  • Agents
  • Claude Code
  • MIT

Rapi Labs

Game studio · casual mobile games

Small, bright mobile games such as Ice Smash, Egg Catcher and Duck Rescue. I handle ads, analytics and store releases. Ice Smash is live on the App Store.

  • React Native
  • Firebase
  • AdMob
खिड़की वाली सीटWINDOW SEATthe view between stations

When I log off, I go somewhere with bad network.

Mountain roads in Himachal and Kashmir, islands in Thailand, and every dog that wanted to be in the photo. Scroll sideways for the view.

Abhiraj smiling in a snowy valley
Me, very happy to have no signal
Kashmir, the valley road
Kashmir, the valley road
Road to Rohtang. Two locals ran the checkpoint.
Road to Rohtang. Two locals ran the checkpoint.
Himachal, last light on the peak
Himachal, last light on the peak
Senior engineer, on a break
Senior engineer, on a break
Prayer flags, Himachal
Prayer flags, Himachal
Sun going down behind the pass
Sun going down behind the pass
Evening lights by the river
Evening lights by the river
Longtail boats, Phi Phi Islands
Longtail boats, Phi Phi Islands
Thailand, by speedboat
Thailand, by speedboat
Abhiraj scuba diving next to a clownfish and anemone
Deep breaths and deeper dives, Phi Phi
सिग्नलSIGNALShow a change reaches production

Agents write a lot of my code. Nothing ships until it's proven.

I work AI-native: I write the design, coding agents build and test it, and I own the review and the rollout. Every change has to pass these signals in order.

Backend

  • Node.js
  • TypeScript
  • Express
  • NestJS
  • REST
  • WebSockets
  • Microservices

Data and infra

  • PostgreSQL
  • MongoDB
  • Prisma
  • Docker
  • Kubernetes
  • RDS Performance Insights

Frontend and mobile

  • React
  • React Native
  • Expo
  • Redux
  • Tailwind

AI

  • Azure OpenAI
  • Claude Code
  • MCP
  • LLM-as-judge
  • Multi-agent workflows
  • LLM cost modelling
  1. 1

    Plan

    A written design with acceptance criteria, before any code.

  2. 2

    Review the plan

    A separate reviewer reads it. Gaps go back to the planner.

  3. 3

    Build and test

    Agents implement against the plan, with tests for every requirement.

  4. 4

    Prove it, then ship

    Evidence for each requirement, a final review, and a rollout I watch.

One-way ticket, valid for one hire

Abhiraj Sinha
HYDYour team
Passenger
Abhiraj Sinha
Class
SDE II · Backend and AI
Boarding from
Hyderabad, open to remote
PNR 2026-HIRE Seat confirmed, if you want it. Last station of this site. The next one is your team.

Thanks for riding the whole line. The next stop is your team.