I build payment systems and the AI agents that run on top of them. Senior backend engineer, 9+ years in Java and Spring Boot, including 4+ years on the billing and payments platform behind a marketplace moving about $4B a year. On Upwork I am Expert-Vetted (top 1% of freelancers) with a 100% Job Success Score.
Payments and fintech. Provider integrations end to end: Adyen, Braintree, Payoneer, PayPal, Wise, Stripe, bank vPOS. Card processing, payouts, 3DS2, network tokens, webhooks, reconciliation, idempotency and double-charge prevention.
AI agents and LLM systems. LangChain, LangGraph, RAG, vector databases, Model Context Protocol, multi-agent orchestration. Built an agentic system that investigates failed payment transactions on its own, reasoning across logs, dashboards, source code and incident tooling.
- Memabooks — my own AI commerce product, built and run solo. A child's photo becomes a personalized illustrated storybook, printed on demand and shipped worldwide. 10K+ books created. Identity-preserving image pipeline (diffusion models, fine-tuned LoRA adapters, serverless GPU) at roughly $0.04 per generated image.
- gner.am — real-estate price map of Armenia. I built the data pipeline behind it, which processed 10,000+ listings a day at peak, plus the map, statistics and trilingual frontend.
- Geoapify SDKs — maintained the public TypeScript SDKs for MapLibre GL, Leaflet and GeoJSON (~55K npm downloads/month), and the API playgrounds at apidocs.geoapify.com.
Stack: Java 17, Spring Boot, Node.js/NestJS, TypeScript, Angular, Python, PostgreSQL, MongoDB, AWS, Docker, Kubernetes, REST, GraphQL.
- Oracle Certified Professional: Java SE 11 Developer
- IBM RAG and Agentic AI Professional Certificate
- Google Cloud Generative AI Leader
- Microsoft Certified: Azure AI Fundamentals
- BSc in Computer Science, American University of Armenia
- Former Java lecturer, Russian-Armenian University
📍 Yerevan, Armenia | English, Armenian, Russian
