Full-Stack Software Engineer specializing in AI Orchestration & HealthTech Interoperability.

Giannis Roussos

Building resilient, clinical-grade systems with a 'zero-fail' mindset forged in the Special Forces and ICU Nursing.

Now

Engineering Mission-Critical Systems

Currently based in North Carolina (US Citizen) and engineering AI-driven clinical interfaces and FHIR-compliant data systems. I specialize in **LLMOps and High-Availability AI Orchestration**, focusing on bringing 'zero-fail' reliability to the HealthTech sector.

Recent

Engineered a high-availability AI Clinical Context Agent featuring a multi-model 'waterfall' architecture (Gemini/Gemma). Achieved 100% uptime across 429/503 API error states by automating failover, maintaining sub-2-second latency for acute care synthesis. Integrated RAG via Supabase pgvector and live FHIR R4 data ingestion for production-grade decision support.

Approach

I approach software as a unified system of code and human workflow. My background as a Special Forces Veteran and ICU Nurse allows me to architect full-stack solutions with a 'zero-fail' mindset—prioritizing reliability and security in high-stakes environments. Today, I specialize in AI Agent Orchestration and HealthTech Interoperability, translating complex clinical requirements into resilient, production-grade code. I thrive at the intersection of cutting-edge technology and real-world impact, building tools that empower users and drive meaningful change.

Capabilities

⚡ Full-Stack & AI Engineering
Next.js 15, TypeScript, Python, SQL
LLMOps: Multi-model orchestration & automated fallback systems
RAG: Vector database architecture (Supabase pgvector) and semantic search
Three.js, WebGL & interactive experiences
Design systems & component libraries
🎯 System Architecture and Implementation
Resilient Infrastructure: 429/503 error handling & graceful degradation
Product vision, roadmapping & UX strategy
Go-to-market planning & execution
Stakeholder management & cross-functional leadership
📈 Technical Communication & Stakeholder Management
Digital marketing campaigns & conversion optimization
Sales strategy, pipeline management & client relations
Brand development & story-driven content
🏥 Healthcare Expertise
Clinical workflow optimization & compliance
Healthcare Interoperability: FHIR R4 / HL7 integration and clinical data synthesis
ICU and ER Registered Nurse with a decade of experience

Technology Stack

Core Infrastructure & Systems

TypeScript

Next.js

Node.js

PostgreSQL

Prisma

React

AI/LLM

AWS

Tailwind

Three.js

Python

Git

Docker

Firebase

GraphQL

Selected Projects

2023 - 2026

AI Clinical Context Agent

Next.jsLLMOpsRAGFHIRGemini 2.0SupabaseHealthcare

Project Details

High-Availability Clinical Intelligence & LLMOps Platform. A production-ready agent designed for acute care settings. Features a resilient multi-model fallback "waterfall," real-time FHIR R4 integration, and a custom benchmarking suite. Built by an ICU Nurse to solve clinical explainability and system uptime challenges.

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FHIR Pulse: Clinical Interoperability

HL7 FHIRNode.jsAWSHealthcare

Project Details

A production-grade interoperability dashboard architected to aggregate HL7 FHIR R4 data streams via secure Node.js middleware. I engineered a low-latency visualization layer for real-time vitals tracking, implementing custom schema validation and HIPAA-compliant data handling for high-stakes clinical environments.

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Skinstric: AI Biometric Interface

MediaPipeComputer VisionTypeScriptAI

Project Details

An AI-driven capture interface using MediaPipe for real-time 3D biometric landmark tracking. I developed a telemetry feedback loop to gate data ingestion based on image fidelity, ensuring medical-grade data quality for downstream AI diagnostic analysis.

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Summarist: AI SaaS Architecture

AI OrchestrationNext.jsStripePostgreSQL

Project Details

A full-stack SaaS platform featuring LLM orchestration for automated content summarization. I engineered a robust architecture integrating Firebase Auth for identity management and a tiered Stripe subscription system, focusing on high-concurrency API handling.

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Enterprise API Governance & Security Sentinel

PythonOpenAPIGitHub ActionsCI/CD

Project Details

Engineered a Python-based static analysis engine to enforce OpenAPI 3.0 security and compliance. Integrated with GitHub Actions to create an automated CI/CD "gatekeeper" that blocks insecure protocols (http) and ensures 100% auditability for enterprise API specifications. Transformed manual governance into a "fail-fast" automated pipeline.

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Interactive 3D Engine

Three.jsWebGLAPI ArchitectureGenerative UI

Project Details

A high-performance 3D visualization engine built with Three.js and WebGL. I optimized custom shaders to maintain a fluid 60fps on mobile devices and architected a modular AI-integration interface designed for generative asset creation. This project demonstrates the ability to bridge immersive 3D environments with extensible API layers, focusing on performance-first digital twin rendering.

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Ultraverse: Asset Marketplace

Next.jsWeb3 APIState Management

Project Details

A scalable marketplace architecture built with Next.js and integrated blockchain API endpoints. I focused on state management and ownership verification logic, ensuring a performant and secure interface for high-volume digital asset browsing.

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QuickStay: Booking Logic Engine

TypeScriptAPI DesignSaaS

Project Details

A full-stack reservation engine emphasizing type-safe architecture and complex state synchronization. Built with React and TypeScript, it features a robust search algorithm and managed mock-API interactions to simulate enterprise booking lifecycles.

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Firebase Auth & System Architecture (Netflix)

Firebase AuthFirestoreReact

Project Details

A deep dive into secure identity management and real-time database synchronization. I used this project to master Firebase Auth and Firestore, building a subscription-style interface with a focus on protected routing and secure user-session persistence.

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Blinkin: API Integration & SPA Logic

ReactAPI IntegrationState Management

Project Details

An exploration of Single Page Application (SPA) architecture and third-party API consumption. This project focuses on efficient data fetching from the TMDB API, custom search filtering logic, and managing global state for user watchlists in a clean React environment.

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