Flexible path4 sections

C# Practical Coding Problems

Hands-on coding rounds with practical C# data, API, and reliability exercises.

A practical C# coding interview track covering strings, dictionaries, grouping, parsing, pagination, validation, rate limiting, retry, caches, log aggregation, and edge-case thinking.

Recommended start

Strings & Collections

Word counts, unique characters, grouping, dedupe, and interval-style collection problems.

5 drillsSection 1 of 4

Open section Browse all drills

Learning path

4 active sections / 18 drills

1Strings & CollectionsRecommended startWord counts, unique characters, grouping, dedupe, and interval-style collection problems.5 drillsSection 1Open section 2Data Shaping & LINQTop-K, trees, paging, query filters, and DTO-shaped collection transformations.4 drillsSection 2Open section 3API Helpers & ReliabilityValidation helpers, rate limiting, retry with cancellation, LRU cache, and log aggregation.5 drillsSection 3Open section 4Test Thinking & Edge CasesVersion comparison, invoice totals, log redaction, batch chunking, and hidden-test reasoning.4 drillsSection 4Open section