வணக்கம்

Thiyagu
Arunachalam

Your friendly neighborhood developer.

From Theni, Tamil Nadu — building in Japan

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About

I'm a full stack engineer with 4+ years building secure, high-performance web applications in TypeScript across Vue, Angular, and React — with measurable wins like 25–40% gains in rendering, page load, and API response times.

My path runs from Theni, in the foothills of the Western Ghats, through Coimbatore and Goa, to Tokyo — where I now build a research-institute management platform end-to-end with Vue 3, TypeScript, Spring Boot, and PostgreSQL.

Ask my teammates: I'm the friendly neighborhood developer. I review code kindly, debug production calmly — from rendering bugs to connection-pool exhaustion — and clarify specs in Japanese and English every day.

Theni Coimbatore Goa Tokyo

  • Tamil Native
  • English Business
  • Japanese Conversational — daily at work

Skills

Languages & Core

  • TypeScript
  • JavaScript (ES6+)
  • HTML/CSS
  • Java
  • Python

Frontend

  • Vue 3 (Composition API)
  • React
  • Angular
  • RxJS
  • PrimeVue
  • Angular Material
  • Bootstrap

State Management

  • NgRx
  • Vue provide/inject
  • Composables
  • Config-driven patterns

Performance

  • Lazy loading
  • AOT compilation
  • Tree-shaking
  • Render optimization
  • API caching

Security

  • JWT
  • OAuth 2.0
  • RBAC
  • XSS/CSRF/CORS mitigation
  • Security audits

Backend & APIs

  • Node.js
  • Express.js
  • Spring Boot
  • RESTful design
  • PostgreSQL
  • SQL

Testing & Tooling

  • Cypress
  • GitHub
  • CI/CD
  • i18n
  • Webpack
  • Figma

Experience

  1. Tomato Co., Ltd

    Shibuya, Tokyo, Japan

    System Engineer Nov 2025 — Present

    • Building a research-institute management platform end-to-end — from Figma-style mockups to production — with Vue 3, TypeScript, Spring Boot, and PostgreSQL.
    • Type-safe multi-step forms with dynamic question types, discriminated union typing, and schema-based validation.
    • Config-driven state architecture with provide/inject and composables, replacing brittle switch-case logic.
    • Daily collaboration with the client in conversational Japanese and English.

  2. CodeMax IT Solutions

    Goa, India

    Software Developer Apr 2024 — Sep 2025

    • Angular modules with dynamic components — cut redundant re-rendering by 25%.
    • Node.js REST APIs 40% faster through query optimization and caching.
    • RBAC with JWT and OAuth 2.0; security audits fixing XSS, CSRF, and CORS issues.

    Angular Developer Apr 2023 — Apr 2024

    • Lazy loading, AOT compilation, and tree-shaking — 30% faster initial page load.
    • White-label Angular architecture enabling multi-brand customization.
    • Modular NgRx onboarding workflow — 30% fewer form submission errors.

  3. Centiyent

    Coimbatore, India

    Full Stack Developer Jun 2022 — Mar 2023

    • SIEM web application for monitoring, analyzing, and visualizing security events.
    • 40+ reusable Angular components, cutting development time ~30% across projects.
    • 20+ RESTful Node.js APIs backed by PostgreSQL; JWT + bcrypt authentication.
    • Unit and UI testing with Cypress.

Education

Master of Science — Physics

Gandhigram Rural Institute, Dindigul, Tamil Nadu · 2019 — 2021

Award

Software Developer of the Quarter (Q2, 2024)

CodeMax IT Solutions — Recognized for exceptional performance, technical excellence, and key contributions.

Projects

Individual projects, apart from my day job.

Suvadu — Version Control for Artists

Version control built for artists — manage and revisit artwork revisions the way developers manage code.

  • Next.js
  • Tailwind
  • Cloudflare R2
  • PostgreSQL
  • Chart.js
  • Excalidraw

Kitsune Chaos

Interactive STEM tools you can learn by doing — open source, no sign-ups, no friction.

  • STEM
  • Open source
  • Interactive tools
  • Next.js
  • React
  • Canvas

@kitsunechaos/use-outside-click

A tiny React hook to detect clicks outside an element — SSR-safe, TypeScript-native, zero dependencies. Built for modals, dropdowns, and popovers.

  • React
  • TypeScript
  • npm package
  • Zero dependencies

ElementPin — Local Sticky Notes

Chrome extension that pins sticky notes to specific page elements — notes survive reloads and SPA navigation. 100% local, zero data collection.

  • Chrome extension
  • IndexedDB
  • MutationObserver
  • Privacy-first

Beyond the code

Life outside the editor.

Pencil drawing

Graphite sketches — slow, quiet, and fully analog.

Book reading

On the shelf lately:

  • Frankenstein — Mary Shelley
  • The Metamorphosis — Franz Kafka
  • A Man Called Ove — Fredrik Backman

Writing fiction

I write and publish fiction online — currently Blood Trails.

Read on Royal Road Read on Substack

Get in touch

Got a project, a role, or just want to say vanakkam? My inbox is open.

athiyagu6@gmail.com
GitHub LinkedIn

Kawasaki, Japan · Roots in Theni, Tamil Nadu, India