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Data Warehouse — Article
Definition A data warehouse is a centralized store of structured, historical data — typically modeled with facts and dimensions using a star or snowflake schema — organized specifically to support analytical querying and reporting, as opposed to the transacti...
Data Warehouse Use Cases — Needed vs. Overkill
When a data warehouse is genuinely needed BI/reporting — ad hoc slicing across dimensions (region, time, product) at speed; row-stores choke on this at scale. Historical/point-in-time analysis — cohort retention, trend analysis, "what did exposure look lik...
Diagram Types — When to Use Each
Structure & relationshipsArchitecture — Shows the components of a system (services, databases, queues, external APIs) and the connections between them. Use it when someone needs to understand how the pieces of a system fit together at a glance — onboarding a n...
Decision-Making & Thinking Methods — When to Use Each
Elimination-based methodsProcess of elimination — Systematically ruling out options that fail a hard requirement until only viable ones remain. Use it when you have many options and at least one clear disqualifying criterion (budget cap, hard deadline, legal r...
Elasticsearch Engineering – Digest
The short companion to Elasticsearch Engineering: a glossary, then the facts worth memorising for the Elastic Certified Engineer exam (Elasticsearch 9.3), domain by domain. Use it for revision; go back to the full guide for explanations, examples and doc links...
Elasticsearch Engineering
A study guide for the Elastic Certified Engineer exam (Elasticsearch 9.3), organised by the official exam objectives.How to read this guide. Each objective gets (1) a mental model, often an everyday analogy, (2) the APIs you'll actually type, (3) the traps gra...
Delivery AI Software Engineering Senior Manager
About the job Who We AreBoston Consulting Group partners with leaders in business and society to tackle their most important challenges and capture their greatest opportunities. BCG was the pioneer in business strategy when it was founded in 1963. Today, we h...
LangChain — Components Deep Dive
A study guide to building agents with LangChain 1.x (Python), one component at a time: what it is, the code you will actually type, when to use it (and when not to), the traps, and where the official docs live.How to read this guide. Every component has (1) a ...
LangGraph — Components Deep Dive
A study guide to LangGraph 1.x (Python), taken one component at a time: state, nodes, edges, compile and run, persistence, interrupts, fault tolerance, subgraphs, workflow patterns, the Functional API and streaming. Each part says what it is, shows the code, s...
Prefect — Components Deep Dive
A study guide to Prefect 3 (Python workflow orchestrator), one component at a time: what it is, the code you will type, when to use it, the traps, and where the official docs live.How to read this guide. Each component has (1) a mental model, usually an analog...
RustFS — Components Deep Dive
A study guide to RustFS, an open-source, S3-compatible distributed object store written in Rust: what each component is, the commands and settings you will actually use, when to use it, the traps, and where the docs live.How to read this guide. Each component ...