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Aporeon

Technical interview practice, from one developer to another.

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Coding problemEasy~15 min

Build a paged result from a list

Implements a safe in-memory paging helper with metadata and boundary handling.

Coding problemMedium~25 min

Build a safe filtered list endpoint

Implements bounded filtering and deterministic keyset pagination without accepting arbitrary query expressions.

.NETASP.NET CoreC#EF CoreSQL

Practice drill

Coding problemEasy~15 min

Build a typed create-resource endpoint

Creates a resource through an explicit request DTO and returns typed 201, 409, and validation outcomes.

.NETASP.NET CoreC#EF Core

Coding problemMedium~25 min

Calculate invoice total with discounts

Implements invoice total calculation with quantity, unit price, percentage discount, and rounding.

Coding problemMedium~25 min

Implement a simple fixed-window rate limiter

Implements a small in-memory fixed-window rate limiter with per-key counters.

Coding problemMedium~25 min

Parse a query filter string

Parses a simple filter expression into a validated dictionary without accepting arbitrary keys.

Coding problemEasy~15 min

Prevent overposting with an explicit update DTO

Updates only public mutable fields and leaves ownership, status, and audit values server-controlled.

.NETASP.NET CoreC#

Coding problemMedium~25 min

Redact sensitive fields in log data

Implements safe redaction of known sensitive keys in a dictionary before logging.

Coding problemEasy~15 min

Return consistent validation ProblemDetails

Produces field-keyed validation errors through one reusable endpoint boundary.

.NETASP.NET CoreC#

Coding problemEasy~15 min

Validate a date range request

Implements a small validation helper for date ranges with clear error messages.