Sydney, Australia

Platforms built to scale.
AI engineered to ship.

Hi, I'm Shreejai, a Senior Software & AI Engineer based in Sydney with 7+ years building scalable platforms, AI agent systems, and component ecosystems adopted across engineering teams.

Shreejai Raj

Experience

Work History

Software Engineer

Decidr AI

Nov 2024 – PresentCurrent
  • —Leading end-to-end development of real-time voice capabilities for AI agents using WebSockets and the Gemini Multimodal Live API, engineered robust stream management handling speaker echo and interruptions gracefully, achieving sub-600ms response latency.
  • —Evaluated and benchmarked top-tier AI models (Gemini, OpenAI, ElevenLabs, Amazon Nova Sonic), establishing Gemini as the optimal cost-performance solution and strategically managing TTL for context caching to maximise efficiency at scale.
  • —Designed and built a reusable TypeScript/React/Next.js component ecosystem adopted by 4 engineering teams, applying Atomic Design and modular architecture principles.
  • —Architected foundational platform for a No-Code AI Agent Builder, enabling configurable tools, dynamic tool calling, and multi-agent workflows.
  • —Built a company-wide interactive live playground for reusable UI components, used by engineering, QA, and design teams to discover and validate functionality.
  • —Led end-to-end re-engineering of core conversational AI agents from BotPress into a custom TypeScript/Next.js architecture, owning the full migration from design through deployment, replacing platform constraints with an extensible internal system with greater control over agent behaviour and tooling.
  • —Contributed to an AI-driven No-Code Page Builder and a personalised AI job-seeker assistant integrating AI workflows with a partner platform.

Full Stack Developer

Sherpa Delivery

May 2021 – Nov 2024
  • —Architected reusable React/TypeScript components and a custom design system enabling consistent functionality across multiple regions.
  • —Designed and launched a drag-and-drop Page Builder that enabled non-technical teams to create and publish branded pages through configurable layouts.
  • —Refactored core microservices from legacy implementations toward modular, scalable architectures supporting increasing platform volume.
  • —Identified and resolved frontend performance bottlenecks through profiling, component optimisation, and Core Web Vitals improvements.

Full Stack Developer

Rotapix Interactive

Jan 2020 – May 2021
  • —Delivered 25+ end-to-end web applications using React, TypeScript, WordPress, MUI, and Tailwind CSS.
  • —Implemented and integrated REST APIs, relational and NoSQL databases, and headless CMS platforms across diverse client projects.
  • —Mentored junior developers on modern engineering practices, reusable architecture, and performance optimisation.

Front End Developer

The Tax Institute

Aug 2019 – Nov 2019
  • —Built and launched the organisation's first production conversational decision-tree chatbot, streamlining member support workflows.
  • —Developed reusable frontend components and integrated REST APIs, HubSpot, and CMS functionality across public-facing platforms.

Skills

Technical Expertise

AI & LLM Engineering

AI AgentsVoice AgentsReal-Time AIMulti-Agent SystemsTool CallingLLM IntegrationsOpenAI APIGemini APIModel BenchmarkingContext CachingAI Workflow DesignConversational AI

Languages & Frameworks

TypeScriptJavaScript (ES6+)ReactNext.jsNode.jsExpress.jsPHPRuby on Rails

Software Architecture

Scalable System DesignModular ArchitectureMicroservicesAPI DesignComponent ArchitectureSOLID PrinciplesCode Reusability

Frontend Engineering

ReactNext.jsViteReduxTailwind CSSGSAP AnimationsWeb PerformanceCore Web VitalsThree.jsReact Three Fiber

Backend & Data

Node.jsREST APIsWebSocketsDrizzle ORMPrisma ORMActive RecordPostgreSQLMySQLMongoDBSupabaseAirtableRedis

Developer Experience

Component LibrariesDesign SystemsLive PlaygroundsDeveloper ToolingGit

Projects

Personal Builds

Conversational AI Platform Migration

Led end-to-end migration of production AI agents from BotPress into a custom TypeScript/Next.js architecture, designed and built solo, replacing third-party constraints with a fully extensible internal system.

AI Content Generator

An experimental AI-powered blog-writer and content generator that generates buyer personas, discovers keywords, and writes SEO-optimized blogs and content.

Interactive 3D Fitness App

Interactive 3D fitness app for visualizing and tracking muscle groups and workouts.

Posture Scan

Web app that scans your posture against a reference pose and gives real-time feedback using computer vision.

Contact

Get in Touch

Open to new opportunities. Whether you have a role in mind or just want to connect, feel free to reach out.