Describe a scenario where you had to make trade-offs between data processing speed and accuracy. How did you approach this situation and what was the outcome?

Situation: SLA required 6 AM daily reports; full reconciliation took 12+ hours. Task: Meet SLA while maintaining accuracy for finance. Action: Implemented tiered accuracy: (1) Preliminary report at 6 AM using incremental, approximate aggregates (~95% complete). (2) Final reconciled report by noon. Communicated methodology to stakeholders; documented assumptions. Used HyperLogLog for approximate counts where appropriate. Result: SLA met; users got early signal; finance used final for official reporting. Data-Driven: Defined 'good enough' with business; monitored accuracy drift. Outcome: Aligned on acceptable trade-offs; clear expectations; no surprises.