Athanasios Voivodas

Sole architect and engineer of a multi-tenant food delivery SaaS platform for independent merchants in Greece. Designed and implemented a Go microservices architecture (auth, restaurants, orders, delivery, billing, notification, rating) using gRPC with full event sourcing via KurrentDB. Built multi-tenant scalability through event-driven services and real-time event propagation, and implemented Stripe Connect for subscription lifecycle management and multi-vendor payouts with webhook synchronization. Added observability from scratch using OpenTelemetry (tracing, structured logging, metrics). Also built a React + TypeScript frontend with TailwindCSS for authentication, menu management, and order tracking. Additionally developed a real-time Voice AI restaurant management agent using the LiveKit SDK with low-latency conversational interfaces backed by LLM pipelines.

Led a 7-person cross-functional team while remaining deeply technical, owning architecture decisions, code reviews, and complex backend implementations. Designed and built an automated tutor replacement system integrating scheduling, availability, and notification workflows, delivering major cost savings. Directed migration of communication channels (SMS to push/email) to reduce infrastructure costs. Drove delivery across Group Sessions, VR Lessons, and other learning features, spanning backend APIs, real-time infrastructure, and frontend integration. Built the Safety Center from scratch with careful data modeling and compliance-aware design. Maintained IC-level contributions throughout while owning product roadmap and technical delivery quality.

Built backend services for a regulated European fintech providing PSD2 payment initiation and KYC identity verification. Developed PSD2-compliant payment flows and KYC onboarding pipelines handling high-volume regulated transactions across EU jurisdictions. Created integration middleware connecting banking, identity verification, and compliance systems with complete audit trail support. Extended the Probanx core banking system for high-volume, low-latency transaction processing.