AJA is an early-stage startup from Berlin founded by three business students. We are building an experimental test chain for changed AI models: when a model is quantised, reconfigured or retrained, does the original evaluation still hold? Criteria and test cases are sealed in advance, the old and new model are compared pairwise, and the result is a signed evidence package that third parties can verify independently, even offline. Our first field of application is defence. We are looking for a technical co-founder who wants to shape this from the start.