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Designing interactions across systems can be complex. Microservices, actors, threads: anything involving communication or sharing can lead to complex state machines that are then hard to test and reason about. TLA+ is a formal specification language created by Leslie Lamport (Paxos, LaTeX, Turing award) to design, model and verify systems. With it you can help uncover latent edge cases in our design, as well as prevent deadlocks and race conditions. In this short talk Ruben will share with you how you can model a real system as a PlusCal (pseudocode-like language that can be machine-translated into TLA+) algorithm, and how it compares to roughly equivalent Akka code.

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