In the context of increased merger and acquisition (M&A) activity, particularly in the tech sector, ensuring the reliability of systems is crucial for the success of these deals. Evaluating and improving reliability practices during the M&A process can mitigate risks and enhance post-acquisition integration. This involves assessing the target company's reliability practices during scouting and due diligence, and incorporating resilience testing, such as GameDays, during integration to ensure system robustness and synergy realization. Emphasizing system reliability not only protects the brand and maintains customer trust but also optimizes financial outcomes by reducing operational redundancies and avoiding costly outages. Chaos Engineering and structured resilience exercises help teams understand and improve system dependencies, ultimately facilitating a smooth transition and maximizing return on investment in M&A activities.