Only a tiny fraction of the code your application runs was written by you or your team. How do you know you can trust the code that was written by other people? Where would you even start? This piece is part of a larger series on [Engineering for Site Reliability](/series/engineering-for-site-reliability/), specifically _balancing stability against the edge of technology_. What do I mean by “trust”? Movies and TV shows have given us a version of trust which essentially boils down to “Do you trust me?