Fivetran and BigQuery are leveraged to build a data engineering pipeline for fraud detection, addressing challenges such as scale and complexity, administrative effort and maintenance, and steep learning curves. Fivetran automates the process of ingesting and moving data from various sources to a cloud data platform, while BigQuery provides advanced analytics and machine learning capabilities. The combination of both tools enables real-time insights generation, scalability on demand, and democratized machine learning for fraud detection. By leveraging these tools, businesses can streamline their data integration and improve their ability to detect fraudulent transactions.