50% lower AWS spend while scaling tax compliance across 25 jurisdictions

Compliance coverage was expanding faster than the infrastructure budget could absorb. We separated the compute profile of filing from the profile of calculation and right-sized each independently.

Lumen PaymentsData & Platform Engineering

-50%
infrastructure cost: 25
European jurisdictions live: 3x
filing throughput

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The constraint

Every new jurisdiction added a fixed infrastructure cost, so compliance coverage and the cloud bill grew together. Leadership had started treating expansion as a cost decision rather than a product one.

What we changed

Filing and calculation had been deployed as one service because they shipped together in 2021. Their load profiles are nothing alike: calculation is bursty and CPU-bound, filing is scheduled and IO-bound. Splitting them let each scale on its own terms.

Separate compute profiles for burst and scheduled work
Spot capacity for calculation, reserved for filing
Per-jurisdiction cost attribution so the next decision has data

Where it landed

Infrastructure spend halved while throughput tripled, and the marginal cost of a new jurisdiction stopped being a blocker.

We assumed the cost curve was the price of compliance. It turned out to be the price of one scheduling decision made three years ago.

David Miller

Chief Technology Officer

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