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Articles
dbt Macro Interview Questions: Jinja, Parse-Time Errors, and Compiled SQL
Practice dbt macro interviews with a failing run_query example, execute guard, compiled SQL checklist, and warehouse side-effect checks.
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dbt Model Contract Interview Questions: Types, Breaking Changes, and Versioned Models
Practice dbt model contracts with type-check failures, adapter-specific constraints, versioned refs, and a staged consumer migration.
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dbt Python Model Interview Questions: DataFrame Returns, Runtime Boundaries, and Incremental Logic
Practice dbt Python DataFrame returns, Snowpark execution, remote packages, and incremental filters with a late-update ledger and five interview exercises.
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dbt Semantic Layer Interview Questions: Entities, Metrics, and Join Paths
dbt Semantic Layer interview questions: study realistic examples, debug common failures, and explain trade-offs with a clear verification plan.
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dbt Snapshot Interview Questions: Change Detection, Hard Deletes, and History Gaps
Practice dbt snapshot interview questions with executed timestamp/check examples, hard-delete policies, validity times, and missing-history cases.
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dbt State Selection Interview Questions: Defer, Changed Models, and Safe CI
Practise dbt state selection interviews with manifest baselines, defer resolution, stale CI parents, cross-environment tests, and separate freshness checks.
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dbt Testing Interview Questions: Unit Tests, Data Tests, and CI
Practice dbt testing questions with unit-test fixtures, data tests, CI selection, SQL edge cases, and incremental-model testing limits.
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Debezium Snapshot Interview Questions: CDC Cutover, Offsets, and Duplicate Recovery
Practice Debezium snapshot interview questions with a CDC cutover timeline, three offset boundaries, duplicate recovery, and a version-aware sink exercise.
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Debugging Interview Practice: Read Logs, Form Hypotheses, and Fix a Small Repository
Build debugging interview skills with a runnable Python repository, log analysis, testable hypotheses, a focused cache fix, and clear regression evidence.
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Decision Tree Interview Questions: Split Calculations, Pruning, and Unstable Predictions
Practice decision-tree interviews with an eight-row Gini split calculation, verified cost-complexity pruning path, and prediction-stability checks.
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Deliveroo Frontend Interview: React Coding and UI Architecture Preparation
Prepare for Deliveroo frontend interviews with React coding, save and retry behavior, UI architecture, testing differences, accessibility, and AI rules.
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Deliveroo Infrastructure Interview: Terraform Debugging in an AWS Environment
Prepare for Deliveroo infrastructure interviews with Terraform debugging, an AWS health-check scenario, required tools, AI rules, and repair verification.
Articles · Salesforce
Deliveroo Salesforce Engineer Interview: Apex Code Review and Problem Solving
Prepare for Deliveroo's Salesforce interview with an original Apex review exercise, bulkification checks, test cases, and a timed solution walkthrough.
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Delivery ETA Data Scientist Interview Case: Calibration, Late Deliveries, and Dispatch Bias
Practice a delivery ETA data scientist case: compare MAE and late arrivals, check p90 calibration, prevent feature leakage, and explain dispatch selection bias.
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Deloitte Technology Case Interview: Structure an Architecture and Implementation Recommendation
Prepare for a Deloitte technology case with architecture options, migration gates, business constraints, and a defensible implementation recommendation.
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Delta AI Engineering Intern Assessment 2027: Is the OA Automatic, Questions, and Next Steps
Learn whether the Delta AI Engineering Intern 2027 assessment is automatic, what questions may appear, how to prepare, and what happens next.
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Delta Lake Change Data Feed Interview Questions: Update Images, Checkpoints, and Retention
Practice Delta Lake Change Data Feed interview questions on update images, inclusive versions, checkpoint recovery, sink deduplication, and retention limits.
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Delta Lake MERGE Interview Questions: Duplicate Matches, Schema Changes, and Retry Safety
Practice Delta Lake MERGE interview questions with duplicate-match examples, runtime-specific schema rules, deterministic source cleanup, and retry checks.
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Delta Method Interview Questions: Ratio Metrics and Covariance
Practice Delta Method interview questions with ratio metrics, covariance, a worked CTR variance example, and approximation limits.
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Demystifying Event-Driven Architecture: Pub/Sub, Event Sourcing, and Surviving Eventual Consistency
This guide explains event-driven architecture topics including pub/sub messaging, brokers, producers and consumers, event sourcing, asynchronous event…
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Design Engineer Interview Preparation: Connect Your Portfolio to Production UI Code
Prepare a design engineer portfolio walkthrough that links visual choices to production UI code, accessibility checks, component boundaries, and user feedback.
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Design System Interview Questions for Frontend Engineers: Tokens, APIs, Accessibility, and Governance
Practice design system interview questions on tokens, component APIs, accessibility, testing, versioning, adoption, and governance.
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Design WhatsApp: the presence and receipt problems most candidates ignore
Design WhatsApp-style chat with WebSockets, offline inboxes, Kafka partitions, presence TTLs, receipts, and reliable delivery.
Articles
Designing a News Feed: Who Pays for the Delivery?
Learn how hybrid feed systems use fan-out, outboxes, ranking, and read-time merging to handle celebrity posts at scale.