Acquiring & Payments Engine
Amazon Payments
Co-designed and launched merchant acquiring pipelines in Japan, managing integration with external banking networks. Developed serverless transaction systems capable of handling peaks of 18,000 requests/minute (300 TPS) under strict sub-second SLA bounds.
Java / AWS Lambda / Fargate / SQS / DynamoDB
Deterministic RAG Agent Workflow
Open Source Blueprint
An isolated Python/FastAPI semantic search pipeline implementing an Agentic ETL ingestion sandwich (strict regex parsing + LLM chunking + validation schemas) and a bounded Verify-Loop to evaluate and correct hallucinated citations against raw database source segments.
Python / FastAPI / Elasticsearch / Pytest / Ollama
High-Scale Document Ingestion
Search Index System
A Maven-based multi-threaded document crawler and parser employing graph cycle checks, Redis Bloom filters for O(1) duplicate checks, and a Kafka messaging stream to route high-frequency crawl events safely into Postgres.
Java / Maven / Spring Boot / Apache Kafka / PostgreSQL