GermanyManufacturing2025 – ongoing

BMW Group

AI-assisted test creation for mainframe modernization

BMW reduced test-case creation from 10 days to hours, according to AWS

WorkingVendor case studyVendor ↗

Problem

BMW needed to modernize legacy systems. Creating test cases took 10 days and slowed that work.

Approach

BMW partnered with AWS Transform on an AI-powered migration factory. AWS reported that test-case creation fell to hours and test coverage increased. BMW presented the work at AWS re:Invent 2025.

Results

hourstest-case creation time, down from 10 days, according to AWSVendor case study[1]

60%increase in test coverage reported by AWSVendor case study[1]

Takeaway

The reported testing gains concerned work within a larger modernization program. They did not measure the return on the entire migration.

Sources

BMW Group on AWS
Amazon Web Services2025Vendor publication

Source summaries

[1]Amazon Web Services2025

AWS recounted BMW's re:Invent 2025 presentation on mainframe modernization with AWS Transform. It reported test-case creation falling from 10 days to hours and test coverage increasing by 60%.

Full details are in the original sources.

Added 1 Nov 2026 · Updated 1 Nov 2026