Temporal

Temporal is the heavyweight of durable execution: an open-source platform (MIT-licensed, descended from Uber's Cadence) where workflows are code that literally cannot lose state. Every step is journaled; if a worker, process, or datacenter dies mid-workflow, execution resumes exactly where it stopped — making weeks-long, mission-critical processes (payments, order orchestration, infrastructure provisioning, AI pipelines) writable as straightforward procedural code in Go, Java, TypeScript, Python, .NET, or PHP. Signals, queries, timers, and child workflows compose sophisticated long-running systems, and the battle record is unmatched: Snap, Netflix, Coinbase, and thousands of others run it in production. The trade-off is operational weight — self-hosting means running the server cluster plus a database, and the programming model demands determinism discipline. Temporal Cloud removes the ops burden with consumption pricing. When correctness genuinely cannot be compromised, Temporal is the reference answer.