Hi, I'mThiyagarajan
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Full-stack lead engineer with 8+ years building secure, responsive and scalable web, backend and mobile apps — from React Native & Flutter to NestJS microservices, multiplayer game servers and AI agents.
01 // about
Engineer. Architect. Player one.
I've spent 8+ years turning ideas into products people use — mobile apps on the App Store and Play Store, logistics platforms handling millions of orders a week, and a multiplayer arena that ran 100+ players on a single map.
Today I lead architecture on SIRU, a hyperlocal commerce platform built on NestJS microservices and React Native. Before that I shipped Web3 node software for iAgent Protocol and built the DOTPVP game engine at RyukLabs.
I care about lean teams, clean systems and shipping fast without breaking things. I review code, mentor juniors and increasingly pair with AI agents to move quicker.
02 // selected work
Things I've built
SIRU
Led the end-to-end architecture: an edge API gateway as the single auth issuer (OTP, Google OAuth, rotating device-bound refresh tokens), an order state machine, token rewards, and AI-chat-first buyer & merchant apps.
DOTPVP
An agar.io-style 2D arena built from scratch with a custom C++ engine handling 100+ players per map, deployed multi-region with Global Accelerator, crypto-wallet login and anti-cheat.
iAgent Protocol
Node software that lets gamers train AI agents from gameplay and earn tokens. Built the uptime-based rewards back-end and MetaMask auth for the $AGNT launch on BASE.
QA Agents
Chat-driven QA agents that run test cases in parallel across remote browsers and write automated test reports. Also explored multi-agent teams on local models via Ollama.
03 // quest log
Where I've worked
Jan 2026 — Present
Senior Software Engineer
Calsoft (California Software Co.)
- Architecting SIRU: NestJS microservices, edge gateway auth, order state machine with money in integer paise.
- Own the React Native / Expo apps with a streaming AI assistant, real-time chat and voice/video calling.
Sep 2024 — Jan 2026
Solutions Architect
Calsoft — iAgent Protocol & RyukLabs
- Lead team for iAgent Protocol: Flutter node software, AWS rewards back-end, $AGNT token launch.
- Lead engineer at RyukLabs: built DOTPVP, hired and mentored devs, ran AI-agent R&D.
Jul 2023 — Sep 2024
Senior Software Engineer
Delhivery
- Core team of Delhivery One — millions of weekly orders for Amazon, Flipkart, Meesho and Nykaa.
- Built read-only roles and cut API latency with Spring Boot, Kafka and RDS.
May 2023 — Jul 2023
Senior Software Engineer
Bitsila (ONDC, acquired by Paytm)
- Rebuilt bitsila.com in Next.js from WordPress; shipped features on the Rails ONDC product.
Sep 2020 — May 2023
Software Engineer
HobSpace (founding team)
- Shipped multiple Next.js apps, CRM dashboards, trainer calendars and a Flutter PWA.
- Built a chess arena against Stockfish bots using service workers.
May 2019 — Sep 2020
Software Engineer
Licious
- Launched the iOS app and the Metopia subscription screens; Firebase & Branch.io integrations.
- Built a React/React Native PWA, ERP tools, Cube.js dashboards and an Electron barcode app.
04 // inventory
Tools of the trade
Languages
- TypeScript
- JavaScript
- Swift
- Dart
- Python
- C#
- C++
- Java
- PHP
- SQL
Frontend & Mobile
- React
- Next.js
- Vue
- React Native
- Expo
- Flutter
- iOS / Xcode
- Redux
- Zustand
- Tailwind
Backend & Data
- Node.js
- NestJS
- Spring Boot
- Django
- PostgreSQL
- MongoDB
- Redis
- Kafka
- TypeORM
Cloud, Games & AI
- AWS Lambda
- EC2
- SNS
- CloudWatch
- Firebase
- Cloudflare
- Phaser
- Colyseus
- Ollama
- Claude Code
05 // press start
Let's build something great.
Hiring for a lead role, need an architect for your next product, or just want to talk games and AI agents? My inbox is open.