Learn the work behind Data, AI & Forward Deployed Engineering
Practical explanations, career decisions and reproducible workflows. Read the reasoning, inspect the evidence and follow the next skill into a real programme.
Data freshness checks: stop a stale dashboard release
A dashboard can be generated minutes ago from a source that stopped updating days earlier. Freshness checks should evaluate the data's reporting contract, not just the modification time of the output file.
Data lineage: trace a model feature back to its source
Feature lineage explains where a value came from, which rules transformed it and who owns the source. It supports incident analysis, schema review, privacy assessment and model reproducibility.
Data quality checks at ingestion and before training
Ingestion checks protect the shared dataset; pretraining checks protect a particular model run. Both are needed because transformations and filters can create issues after raw data passes.
Data science interview: choose a metric from business costs
There is no universally best classification metric. The useful question is which error changes the decision, how often it occurs and what constraint the system must respect. Accuracy, ROC AUC or F1 can summarize behaviou
Data science interview: diagnose leakage in a suspicious score
A near-perfect score is a reason to investigate before celebrating. In many business tasks, it can reveal a post-outcome field, duplicates across splits, target-derived preprocessing or a validation set that influenced m
Data science interview: interpret a failed experiment
“The metric did not improve” is an outcome, not an interpretation. A strong interview answer shows what the experiment was expected to change, what acceptance rule was set before seeing the result and what evidence now u
Data scientist versus analytics engineer: choose the work you prefer
Data scientists and analytics engineers can work on the same business problem while producing different primary artifacts. One may evaluate predictions or experiments; the other may turn raw operational data into tested,
Data scientist versus data engineer: compare project ownership
A model depends on data before it depends on an algorithm. Data scientists and data engineers often share the same pipeline, but their primary failure modes and operating responsibilities differ. Compare the handoffs on
Data scientist versus ML engineer: compare day-to-day responsibilities
Titles vary across companies. Compare the decisions and systems a role owns before treating “data scientist” or “ML engineer” as a fixed definition.
Data validation for model inputs with realistic edge cases
Input validation should test failures that can occur in the real pipeline: duplicate identities, non-finite values, impossible counts, unfamiliar categories and extreme but potentially legitimate values.
Data warehouses versus lakes for analytical workloads
A warehouse commonly provides managed tables, SQL performance and governance. A data lake commonly stores files in object storage with flexible formats and engines. Modern platforms blur the labels, so choose from access
DAX calculated columns versus measures with a sales example
A calculated column produces a value for each row; a measure produces a result under the filter context of a query or visual. In an Import model, a calculated column's stored values are established during model processin
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