G'day! I'm

Sasi.

I build things for your browser, mobile and the cloud.

A field-tested Full-Stack Engineer with a strong focus on frontend development and a passion for AI and ML. Based in Central Coast, NSW. I love creating robust digital solutions that drive growth and improve user experiences.

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About Me

G'day! I'm Sasitha, a Sydney-based senior software engineer with 9 years building full-stack products across energy SaaS and consumer mobile. I care about shipping digital solutions that make a difference: cloud platforms, mobile apps, and APIs.

After graduating from the University of Moratuwa, I started my journey with the engineering team at Sysco Labs, then migrated to Australia to join Tally Group, where I now lead AI-native delivery of their next-generation self-service energy platform.

On the side, I'm the founder of Voqi, an AI language-practice app I designed, built and shipped solo to the App Store and Google Play, with real-time pronunciation feedback powered by speech AI.

Here are a few technologies I've been working with recently:

TypeScript
React & React Native
Expo & Expo EAS
Node.js
C# & .NET Core
Azure & GCP
Supabase & PostgreSQL
Tailwind & Nativewind
Speech AI & WebSockets
LLMs & Agentic Coding

Where I've Worked

Senior Software Engineer @ Tally Group

Dec 2023 - Present

Tariff Optimisation Costing Engine: Architected and implemented a costing engine to estimate annual electricity cost across different tariffs based on usage, and suggest optimal tariffs with projected cost savings. Built using Azure Durable Functions and C#.
Optimisations: Improved costing engine response time by 60% by reducing data retrieval, eliminating database table locking, and applying parallel processing for consecutive tariff calculations.
Bill Reconciliation Workflows: Technical design and implementation of a SaaS electricity billing invoice reconciliation engine using C# and Azure Durable Functions to identify and raise disputes on overcharged bill amounts.
Electricity Network Settlement Platform: Full-stack development of the Network Settlement section of the C&I portal V2 (SaaS) using Blazor, C# and Azure Durable Functions, including bill validation, dispute management and remittance processing across multiple states and formats.
Blazor UI Development: Developer-led UI development of the C&I portal V2 using Blazor and C#, implementing user-focused features in close collaboration with the PM and primary client to ensure alignment with business requirements.
EnergyAustralia C&I Portal: Led the technical development of EnergyAustralia's C&I portal using C#, .NET & Azure Functions, managing a team of 4 offshore developers and delivering the project within the agreed timeframe.
Multi Tenant Mobile Push Notifications: Designed and built an event-driven, multi-tenant push notification platform for white-label React Native apps, processing billing CDC events via GCP Pub/Sub and delivering personalised notifications through Expo EAS (APNS/FCM) with tenant-isolated token management, CMS-managed templates, and automated delivery receipt tracking on Cloud Run (Node.js/Fastify).

Indie Mobile App Founder @ Voqi Labs

June 2025 - Present

Voqi Mobile App: Designed and launched a language-practice mobile app from scratch, featuring vocabulary management, AI-powered practice with real-world dialogues, speech-based pronunciation analysis with feedback, push notifications and social auth. Available on the App Store and Google Play.
Technologies: React Native, Expo, TypeScript, NativeWind, Supabase, Azure Speech AI, Groq AI Cloud, Node.js, Azure Web Apps, WebSockets.

Software Engineer @ Tally Group

Mar 2020 - Nov 2023

Electricity Self-Service Mobile App: Architected and developed a white-labelled, cross-platform mobile app for electricity users using React Native, providing usage statistics, solar exports, cost saving insights and transactions with optimisations for data-heavy usage visualisations. Shipped as part of the "On by EnergyAustralia" digital suite.
Okta Integration: Spearheaded the migration of the "On by EnergyAustralia" platform to Okta authentication, decommissioning a custom-built auth service and delivering enhanced security standards. Developed solutions across React Native, React & Next.js web apps, and a .NET API in collaboration with Okta engineers.
Electricity Self-Service Web Platform: Developed user sign-up journey segments for new electricity plans in the "On by EnergyAustralia" web platform using React.js and Next.js, with integrations to the API, CRM and analytics.
Data Lake and Reporting: Designed and implemented data ingestion ETL jobs for the "On by EnergyAustralia" data lake using Webhooks, AWS Lambda & AWS Glue. Built analytical reports with PowerBI & AWS Athena for SLA, compliance monitoring and customer engagement.
CI/CD Pipelines: Set up CI/CD pipelines using Azure Pipelines, ARM templates and Azure Secrets for config management. Migrated all existing build pipelines from BuildKite to Azure DevOps.

Co-founder @ Ventrek Innovations

Feb 2020 - Apr 2022

Co-founded a company to provide software engineering resources to an Australian client during a COVID-induced resource freeze.
Served as the primary Technical Lead, managing a team of 4 Engineers and ensuring efficient operations.
Successfully delivered a comprehensive digital suite for a Tier 1 Commercial & Industrial energy retailer, meeting the client's strict deadline.

Software Engineer @ Sysco LABS

Mar 2017 - Jan 2020

Developed report segments in Enterprise Reports project (SPA) and worked on the entire technology stack consists of React/Redux based FE, NodeJS BFF and Java WebFux API
Full-stack Development of CAKE Shop based on EmberJS and JavaScript, the e-commerce application of the company where customers can buy or lease CAKE POS (Point of Sale) devices and services
Designed and developed DocGen API based on NodeJS as a solution for generating exportable reports in PDF and Excel formats which currently used by multiple applications
Held the ownership of CAKE Shop and DocGen API and provided production support when necessary
Improved SalesForce connector API which written in Golang with new functionalities to suit the requirements of the consumers which acted as a proxy API for SalesForce
Dockerized existing applications and configured them to run on AWS ECS environment including best deployment practices such as remote configuration management and log forwarding
Initiated build pipelines and code quality analysing jobs for the team owned components with Jenkins
Introduced PM2 process manager for NodeJS applications as an alternative solution for upstart jobs
Mentored and supervised intern software engineers and new team members to achieve the project goals swiftly
Worked on multiple agile teams across the organization with diverse technology stacks and projects

Some Things I've Built

Featured Project

Voqi App

AI language-practice app designed, built and shipped solo to the App Store and Google Play — vocabulary management, AI-powered dialogue practice, and real-time speech-based pronunciation analysis with per-word feedback ~2s after speech ends.

Full production stack: streaming pronunciation pipeline (WebSockets, Azure Speech AI, Groq-hosted LLMs, Node.js), Supabase backend, RevenueCat subscriptions, Sentry + PostHog observability.

React Native
Expo
TypeScript
Supabase
Azure Speech AI
WebSockets

Featured Project

Hevy MagicMirror Module

Open source plugin for MagicMirror platform to display strength training workout details & muscle split from Hevy App using SVG and Node.js.

Hevy is a free weight lifting workout tracker that lets athletes log their workouts, analyze progress.

REST API
NodeJS
SVG

Featured Project

On By EnergyAustralia Mobile App

On by EA App is a customer-centric mobile application using React Native for both Android and iOS. The app provides On by EnergyAustralia customers self-service capabilities and live chat with customer support.

ReactNative
Redux
ES6
Styled Components

Featured Project

Enterprise Reports

Enterprise Reports is a cloud application to provide comprehensive reports for restaurants who are using CAKE POS (point of sale) devices.

Users can view data of Sales, Transactions, Payroll, Taxes and more on selected dates and use advanced filtering options to analyze or narrow down data.

React
Node.js
Express
JavaScript ES6
Redux
Java WebFlux
Docker
AWS ECS
Webpack

Featured Project

Cake Shop

CAKE shop is the E-commerce site where potential customers can purchase CAKE POS (point of sales) devices, CAKE software subscriptions and other hardware accessories. Project consists of 3 components which are SCAT (sales contract assist tool), Cake Shop FE & Cake Shop BFF.

Ember
NodeJS
Express
Handlebars
ES6
MongoDB
Docker
AWS ECS
Webpack

Featured Project

WireMe IoT Platform

WireMe is an IoT development platform based on Scratch with plug and play customizable hardware modules.

This platform facilitates users to Deploy their IoT systems without writing a single line of code with the block-based visual programming language inherited from Scatch.

Users can plug their desired hardware modules to WireMe hub and use the WireMe desktop app to program the sensors and actuators plugged in.

React
NodeJS
Lua
ActionScript
Raspberry Pi
NodeMCU
Scratch

Recent Tech Talks & Articles

Other Noteworthy Projects

View the archive

DocGen API

DocGen API aka Document Generator API can generate PDF and Excel reports based on either A web URL or data set. Uses a Chrome headless browser (Puppeteer) to load the web page and rasterize it as a PDF.

Project MinuteMan

Project Minuteman is an automated unified build/deploy pipeline for repository components that bind in to a single release.

This centralized pipeline will ease the build, deployment tasks and minimize environmental issues that may come up as it maintains all dockerized components.

Communicator API

API to facilitate outgoing SMS, voice & Emails with a dashboard to view contents for internal testing. This application was re-written with new versions of the same technology stack. API incorporates queuing and failure notification features.

SalesForce Connector

A proxy API to communicate with SalesForce which supports multiple types of SalesForce request types (SOQL / Apex / REST). Used across the organization as the main API to talk with SalesForce.

Sinhala OCR Neural Net

Project to train and recognize Sinhala characters based on LeNet convolution neural network and came up with 91% accuracy in recognizing untrained characters. Done for my Machine Learning course.

Educate Lanka Charity Platform

Educate Lanka charity foundation web platform is built with modern fundraising and portfolio advertising methods using MERN stack as a replacement for the legacy platform.

What's Next?

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My inbox is always open whether for a potential opportunity or just to say hi, I'll try my best to answer your email!

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