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.
Portfolio project: an evaluated document-to-decision workflow
A strong portfolio project shows how a decision is supported, tested and operated. A screenshot of a successful canvas run leaves the important questions unanswered.
Power BI accessibility: contrast, labels and keyboard order
An accessible report lets readers find the relevant measure, understand its scope and complete common tasks without depending on precise mouse movement or colour perception. Review navigation, labels and data alternative
Power BI bookmarks: separate presentation state from data filters
A bookmark can capture more than visual visibility. Depending on its settings, it can restore data selections and other report state. If a button is intended only to switch a chart into a table, it should not unexpectedl
Power BI drill-through without losing filter context
Drill-through should help a reader inspect the records behind a selected result. Define which filters travel to the detail page and which measures or eligibility rules must remain consistent. A detail table that opens su
Power BI incremental refresh and historical corrections
Incremental refresh can reduce routine processing by refreshing a recent portion of data while retaining older history. That efficiency creates a policy question: what happens when a record in an older, normally unrefres
Power BI refresh failures: separate credentials from schema changes
A refresh can fail because the service cannot reach the source, cannot authenticate, cannot interpret the returned data or cannot complete model processing. Those failures need different fixes. Repeatedly resetting crede
Power BI relationship cardinality with a duplicate-key example
Relationship cardinality describes how keys repeat across related tables. In a conventional customer-to-sales relationship, each customer key appears once in the customer dimension and can appear many times in the sales
Power BI star schema: define facts and dimensions first
A star schema separates measurable business events from the descriptive tables used to group and filter them. Define the grain of the fact table first, then create dimensions with unique keys and deliberate filter paths.
Power Query merge versus append with reconciled totals
Append stacks compatible records into one table. Merge relates records through matching keys and adds associated information. Choose based on the intended row meaning, then reconcile the result; a successful operation ca
Power Query types: protect identifiers with leading zeros
An identifier that contains digits is not necessarily a number. Customer ID 0012 may need to remain exactly 0012 through import, transformation, lookup and export. Converting it to numeric 12 removes information that a l
Practice a difficult-client roleplay with a scoring rubric
A roleplay improves only when behaviour is observable. Score how the learner handles disagreement and records a decision, not whether they sound confident.
Precision-recall versus ROC curves for rare outcomes
ROC curves compare true-positive and false-positive rates across thresholds. Precision–recall curves show how many positives are found and how many selected cases are actually positive. For rare outcomes, the latter ofte
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