--- title: "From Labor Law Headaches to Scalable Constraints" url: https://daily.dev/posts/from-labor-law-headaches-to-scalable-constraints-28dkdedfe source_url: https://timefold.ai/blog/complex-labor-laws-to-scalable-conditional-constraints type: article source: "Timefold" published: 2026-03-31T12:27:43.755Z updated: 2026-03-31T12:37:49.183Z reading_time: 3 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # From Labor Law Headaches to Scalable Constraints **[Timefold](https://daily.dev/sources/timefold-blog)** · 3 min read · 0 upvotes · 0 comments ## Summary A Timefold engineer walks through implementing a complex conditional labor law constraint: an employee must not exceed 40 hours every 7 days if they worked a night shift. The solution uses rolling windows to group shifts, the `ifExists` constraint node for conditional evaluation, and a clean JSON-based API design that is extensible and readable. The post highlights how framing the problem correctly ('if ... exists ...') leads to both scalable performance and maintainable code. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Disruption in employee schedules](https://daily.dev/posts/disruption-in-employee-schedules-p9dooohhc) · Timefold · 0 upvotes · 0 comments - [When the human is the Workflow: Durable Execution in harsh physical field operations](https://daily.dev/posts/when-the-human-is-the-workflow-durable-execution-in-harsh-physical-field-operations-hp301go68) · Temporal · 0 upvotes · 0 comments - [A Monthly Addition](https://daily.dev/posts/a-monthly-addition-do1dwfenb) · The Daily WTF · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/from-labor-law-headaches-to-scalable-constraints-28dkdedfe)