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ETL vs ELT

ETL transforms data before it lands; ELT loads it raw and transforms inside the warehouse. Cheap elastic compute made ELT the default, but ETL is still correct when data must never land in raw form, which is exactly the situation in most regulated customer environments an FDE deploys into.

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RELATED CONCEPTS

Idempotent Data Pipelines Data Quality and Validation Change Data Capture (CDC)Parsing Messy, Real-World Data From Proof-of-Concept to Production

LESSONS THAT TEACH THIS

Foundations of Forward Deployed EngineeringNobody budgets for the data reconciliation, and it is most of the work13 min→

PRACTICE THIS IN REAL QUESTIONS

RAG & Agent System DesignWalk me through a RAG pipeline end-to-end, and tell me where it usually breaks→ML Infrastructure & GPUsExplain how the CUDA execution model maps to hardware, grids, blocks, warps, SMs.→ML Infrastructure & GPUsWalk me through the GPU memory hierarchy, registers, shared memory, L2, HBM. What lives where and why?→ML Infrastructure & GPUsWhat is warp divergence and why does it hurt performance?→RAG & Agent System DesignWhen is an agent the wrong answer? Argue against building one.→ML Infrastructure & GPUsHow do you determine whether a kernel is memory-bound or compute-bound?→