Open to opportunities

Ervin Halmi

@ervinhalmi

Message

I build scalable AI, data, and full-stack platforms with Python and cloud services.

Hungary

Message

At Google, I lead backend delivery for production microservices, real-time APIs, AI chatbot integrations, and data pipelines using Python, Vertex AI, OpenAI APIs, Airflow, Spark, Pub/Sub, and BigQuery. I've reduced backend latency by 45%, improved automated support resolution by 40%, and delivered 99.99% service uptime.

Across Cognizant, Capgemini, and NTT DATA, I've built geospatial rental platforms, EV charging systems, secure payment workflows, and web products. I bring 10 years of hands-on experience across Python, Elixir, Go, Django, FastAPI, React, cloud-native architecture, LLM/RAG systems, IoT, and reliable CI/CD practices.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Google

Jan 2023 - Present (3 years 7 months)

Led a cross-functional backend team delivering production-grade microservices and real-time APIs. Architected AI integrations using Vertex AI and OpenAI APIs, improving automated support resolution by 40%.

Full Stack Engineer

Cognizant

Jan 2020 - Dec 2023 (3 years 11 months)

Developed a national rental exchange platform for the UAE using Python, React, and GIS. Engineered geospatial features and integrated AI/LLM services for market analytics and automated pricing.

Python React GIS OpenLayers Mapbox PostGIS Django fastAPI OpenAI API Pinecone Redis AWS GCP GitHub Actions CI CD Microservices REST GraphQL

Software Engineer

Capgemini

Jan 2017 - Dec 2020 (3 years 11 months)

Implemented OCPP 1.6J communication services in Node.js for charger management. Developed EMS/CMS microservices and secure payment workflows, reducing failed settlements by 30%.

Node.Js Development Microservices Docker React Payment Processing PCI Compliance Anomaly Detection Alerting Event Driven Architecture

Backend Developer

NTT DATA

Jan 2014 - Dec 2017 (3 years 11 months)

Developed RESTful APIs using Node.js, Express.js, and Python (Django/FastAPI) for authentication, billing, and reporting. Optimized database schemas and implemented JWT-based auth.