Harshana Amuwatte - Mobile App Developer & Software Engineer in Sri Lanka

About

Recently wrapped up a software engineering internship at WSO2, where I worked on migrating the Java-based Micro Integrator XML Language Server to TypeScript to enable browser-based execution (including WebAssembly powered XSD validation).

Alongside university, I ship indie products including a native macOS app with 200+ paying users across 41 countries and mobile apps with 30K+ downloads. Big on developer tools, compilers, and systems performance.

Off-screen: playing cricket, traveling, and riding.

Experience

Feb 2026 – Jul 2026

6 months

Software Engineer Intern · WSO2

Colombo, Sri Lanka

Integration Team, Engineering, WSO2

Designed and developed a cross-platform XML Language Server using TypeScript and WebAssembly (WASM), replacing the JVM-based implementation and enabling browser support (vscode.dev).
Built XML parsing, language intelligence, and XML/XSD validation using a modular TypeScript architecture and WebAssembly.

Nov 2024 – May 2025

7 months

Software Developer (Mobile, Part-time) · Code Craft Apps Ltd

Moratuwa, Western Province, Sri LankaRemote

Built and maintained Flutter applications while studying full-time.

Sep 2023 – Apr 2024

8 months

Software Developer (iOS, Contract) · Tussle Inc.

United States, Remote

Contributed to the iOS engineering team of a live streaming platform supporting interactive PK battles.

Dec 2021 – Nov 2025

4 years

Freelance Software Developer (Mobile Platforms) · Fiverr

Freelance

Delivered 17+ production mobile applications, maintaining 5-star ratings.

Projects

xml-language-ecosystem

a browser-native xml language services, runs in vscode.dev, xsd validation via xerces-c++ compiled to wasm.

xerces-wasm-validator npmApache Xerces-C++ compiled to WebAssembly for browser & Node.js XSD validation with grammar pool caching.
xml-language-service npmCore language intelligence library for XML parsing, AST diagnostics, and autocompletion.
xml-language-serverModular LSP server implementation.
xml-language-clientVS Code extension client connecting editor workspaces to the language server.
Demos & Helpers
xerces-playgroundInteractive in-browser XSD validation playground & demo.
xml-lsp-marketplacePlugin to plug the XML LSP into Claude Code.
xml-review-bot-demoAutomated GitHub PR review bot for XML schema validation workflows.
benchmarksPerformance benchmarks for xerces-wasm npm package.

Synapse Mac App

June 2025 – Present1.5K Downloads, 200+ Paid Users

Built a native macOS productivity app focused on performance and system-level efficiency. Architected modular components for clipboard management, OCR processing, window utilities, and network monitoring. Optimized for a low memory footprint (~100MB RAM) and lightweight binary size (~3.9MB). Distributed as an Apple-notarized application with 1500+ downloads and used by people in 41 countries.

Scaled Consumer Mobile Application

Mar 2021 – Present30k+ Downloads, 1.2k MAU

Designed, developed, and scaled a subscription-based consumer mobile application to 30k+ installs, ~1.2k monthly active users. Owned end-to-end product lifecycle including architecture, analytics integration, monetization strategy, and performance optimization. Focused on retention, growth experimentation, and operational stability in production.

Moderato CMaaS – AI-Powered Content Moderation Platform

Jan 2021 – PresentOpen Source

Designed and built an API-first content moderation platform powered by Retrieval-Augmented Generation (RAG). Architected backend using FastAPI with modular policy engine for customizable moderation rules. Integrated LLM-based contextual evaluation to enhance decision accuracy. Open-source project focused on extensibility, transparency, and scalable moderation workflows.

Chrome Productivity Extension

Jan 2025 – Jan 20251.3k+ Active Users

Built and published a Chrome extension for workflow automation and productivity enhancement. Designed lightweight client-side architecture with privacy-first local data handling. Achieved 1k+ active users and iterated based on user feedback.