Dananjaya Polwattage

01 · About

Senior Full-Stack Engineer with 6 years of production experience building React and Java Spring Boot applications across banking, ERP, and insurance domains.

I've led frontend architecture for a live banking platform, shipped systems serving 1,000,000+ users at 300 transactions per second, and take on freelance work through Upwork alongside the case studies below.

03 · Selected Work

Four projects, four different problems.

IntelliQuiz

A quiz platform for O-Level ICT students, and the teacher who runs the room.

Role

Full-stack: backend architecture, auth, and the React frontend

Problem: Students needed topic-based practice quizzes with instant feedback, and their teacher needed one place to manage the question bank, roster, and results, without stitching together separate tools.

Solution: Spring Boot 4 backend (JWT auth, rate-limited login, PostgreSQL via JPA) serving a React 19 + MUI frontend, built into a single deployable jar: one artifact, one process, nothing extra to host.

Java 21Spring BootSpring SecurityPostgreSQLJWTReact 19MUI

Lakmal Gardens

A marketing site for a landscaping business, content-driven and CMS-free.

Role

Full build: design system, content architecture, deployment

Problem: The business needed a fast, credible web presence for services and a gallery, without paying for or maintaining a CMS.

Solution: Astro static site with React islands only where interactivity earns its weight, a Tailwind design system, and a photo pipeline into Cloudflare R2 so content updates don't need a redeploy.

AstroReactTailwind CSSCloudflare R2

Live demo →

Plant Shop

An idle greenhouse game: grow, sell, expand, repeat.

Role

Solo build: game design, 3D scene, state architecture

Problem: Wanted to prove out real-time 3D rendering and game-state design running in the browser, not just another CRUD app.

Solution: A react-three-fiber scene (greenhouse, market, terrain, camera controls) driven by a Zustand store handling progression rules and localStorage saves. A real game loop, entirely client-side.

Reactreact-three-fiberThree.jsZustand

Plant Species Studio

A field-catalogue for plant species: fast search, zero backend.

Role

Solo build: data model, UI, search & filter

Problem: Needed a browsing experience for a growing species catalogue that stays trivial to extend, with no database, no admin panel, and no build step to add an entry.

Solution: Every species is one JSON file plus one image; Vite's import.meta.glob loads the whole catalogue at build time, so a new file is a new entry with no manual registration.

ReactTypeScriptVite

04 · Contact

Let's build something worth shipping.

Open to remote full-time roles and freelance engagements with employers and clients worldwide.

© 2026 Dananjaya Polwattage. Built with Astro & GSAP.