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C# Async Coordination: Cancellation, Timeouts, and Bounded Concurrency
A practical interview and production guide to cooperative cancellation, timeout boundaries, bounded fan-out, failure handling, and observability in modern C#.
.NET Runtime and Concurrency
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Reliable Workflow Design: Eight Failure Cases
Eight original worked interview cases covering timeouts, duplicate requests, cleanup, outbox delivery and notification failures, with concrete test ideas. Paid text workshop; no executable lab or PDF included. Preview principle: define the business invariant before choosing a pattern.
Architecture and Design in .NET
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Composition over Inheritance: A Practical Design Checklist
A concise design note on choosing collaborators instead of fragile class hierarchies, with a notification example, trade-offs, and interview checkpoints.
Architecture and Design in .NET
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ASP.NET Core API Resilience: Timeouts, Retries, and Circuit Breakers
A production-focused guide to timeout budgets, safe retries, circuit breakers, cancellation, observability, and common .NET interview traps.
ASP.NET Core
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Source generators at a glance
Compile-time source, analyzer references, incremental caching, and what a driver test must assert.
C# Language
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Observer and Mediator: A One-Page Decision Note
A compact comparison of independent notifications and coordinated workflows, with an ownership table, failure checklist and short worked design question.
Architecture and Design in .NET
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Design Pattern Interview Workbook: Six Boundary Decisions
Six original interview scenarios with model answers and trade-offs: Strategy, State, Adapter, Facade, Decorator and Observer. Includes a reusable answer rubric.