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.
Cost-sensitive classification with an explicit loss table
A classifier threshold encodes a decision trade-off. Accuracy hides that trade-off when false positives and false negatives have different consequences or when a team can act on only a limited number of cases. An explici
COUNT star versus COUNT column in a customer report
COUNT() counts rows. COUNT(column) counts rows where that expression is not NULL. COUNT(DISTINCT column) counts different non-NULL values. The correct choice follows from what you want to count: records, observed attribu
Covariance matrices: detect redundant features
A covariance matrix summarizes how centered numeric features vary together. Exact linear redundancy creates a direction with no variation and makes the matrix singular. That is a property of the feature representation, n
Create a backfill plan with bounded impact
A backfill recomputes historical data after corrected logic, late events or a contract change. The transformation may be simple; the operational risk is not. A large rewrite can overload a source, mix old and new logic,
Create a backup and restore exercise for project data
A backup job can succeed while its output is incomplete, encrypted with a lost key or incompatible with current schema. Recovery evidence comes from restoration.
Create a business-user test script for an AI workflow
Technical unit tests do not show whether an owner can understand, review and recover the process. Business user acceptance testing should exercise outcomes and exception operations.
Create a CI workflow that runs meaningful tests
CI should reproduce the checks that protect the artifact. A green job that only imports one module is weak evidence.
Create a control-evidence matrix for a security review
A policy says what should happen; evidence shows what did happen for a particular system and version. Security review becomes faster when risks, controls, tests and owners are connected in one matrix.
Create a dashboard freshness indicator
A useful freshness indicator says how current the underlying data is, not merely when the report was opened. Source event time, source-loaded-through time, pipeline completion and semantic-model refresh are different tim
Create a disconnected scenario table in Power BI
A disconnected table can hold user-selectable assumptions without directly filtering the transaction model. A measure reads the chosen assumption and applies it to a defined calculation. This separates “which observed re
Create a document intake workflow with duplicate detection
Email retries, users and connectors can submit the same file more than once. Deduplicate before expensive extraction and side effects, while preserving a trace of each received event.
Create a human-review sampling policy
Reviewing only model-flagged cases measures what the model already suspects. Reviewing only random cases can miss rare high-consequence failures. A practical policy combines deterministic risk coverage, uncertainty or no
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