Senior Backend Developer / GenAI Engineer

I designed and developed a production-oriented Retrieval-Augmented Generation platform for intelligent document processing and knowledge retrieval.

I built backend services with FastAPI, PostgreSQL, pgvector, and asynchronous workflows. I implemented document ingestion pipelines, embedding generation, semantic retrieval, and LLM-powered question answering.

I deployed cloud architecture and delivery workflows using AWS services and Docker. I applied API design, structured logging, error handling, and scalable system-design practices.

I served as a backend engineer for a play-to-earn platform with digital purchases and real-money prize distribution. I designed and scaled payment and transaction systems for a digital marketplace.

I implemented multi-provider payment architecture using Stripe, PayPal, and MercadoPago. I built event-driven workflows with webhooks, Celery, and Redis, including state-based payment lifecycle handling for successes, failures, retries, and updates.

I developed reconciliation mechanisms to maintain consistency across distributed financial operations and deployed backend services on AWS Lambda, S3, and EC2 using Python, Django, PostgreSQL, and FastAPI.

I developed internal case-management and administrative systems for the State of Veracruz.

I designed and optimized SQL queries for large datasets, supported production systems, and provided user training. I worked with Laravel, PHP, Vue.js, jQuery, and MySQL.

I worked on a marketplace platform for on-demand services with real-time validation and payment processing.

I designed a Stripe payment flow with delayed capture triggered by QR validation and built a payout system for service providers that calculated platform fees.

I integrated backend APIs with mobile and webview applications and automated notification and transactional backend processes using PHP, MySQL, Stripe, and Firebase.

I designed and developed an educational website with a custom WordPress theme.

I optimized the site for fast loading and responsive design using WordPress, PHP, JavaScript, and MySQL.

Coursework included Natural Language Processing, Machine Learning Fundamentals, Recommendation Systems, Information Retrieval, and Generative AI Fundamentals. Final project: developed a content-based hotel recommendation system using NLP, TF-IDF vectorization, and cosine similarity for natural-language queries.