Screen C# candidates on real starter repos

C#

Advanced~4h

Your team maintains an internal alert triage service. Each incoming alert carries five severity tags — tokens composed of a level indicator and a category code (e.g. 4S 5H 7C 8D JC). The ranking rules for these tag sets follow standard poker hand rankings.

C#

Standard~3h

In a user identity system, an alias cluster is a group of usernames that share exactly the same letters in a different arrangement. Two usernames belong to the same cluster if one can be formed by rearranging the letters of the other.

C#

Starter~2h

Given a word, compute the badge points for that word. You'll need these:

C#

Starter~2h

An internal billing system assigns sequential period numbers to billing cycles. Some periods are designated as extended — they receive an extra processing day for reconciliation.

C#

Standard~3h

An online retailer sells five distinct product SKUs. Each item costs $8 at full price. To encourage bundle purchases, the retailer offers tiered discounts when a customer buys distinct items together:

C#

Standard~3h

Convert an encoded payload, represented as a sequence of symbol values in one radix, to any other radix.

C#

Starter~2h

You are building a roster system for a developer training academy. Participants are assigned to numbered cohorts based on their experience track. The program coordinator needs to view participants grouped by cohort, with each cohort's list sorted alphabeticall…

C#

Standard~3h

Correctly determine the fewest number of coins needed to make an exact target amount from a supplied denomination list.

C#

Starter~2h

You are writing a decoder for a legacy industrial robot controller. The controller receives a continuous stream of 3-character instruction codes. Each triplet maps to a named operation. When a HALT code is encountered, execution stops immediately.

C#

Standard~3h

Implement a function that encodes plain English text into commit jargon. Your team uses an internal shorthand for obfuscating draft commit messages before they reach the shared log. The encoding follows a small set of deterministic rules applied word-by-word.

C#

Starter~2h

You are working on a small internal tool that compares two configuration snapshots.

C#

Starter~2h

You are cleaning imported contact records before they are saved into a CRM. Each record includes a freeform phone field entered by a human, so the data can contain spaces, dots, parentheses, hyphens, and an optional leading country code of 1.

C#

Standard~3h

Output the lyrics to 'The Twelve Days of Christmas'. ``text On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.

C#

Starter~2h

Determine if a text sample has full alphabet coverage. A sample with full coverage uses every letter of the alphabet at least once. The best-known example is: > The quick brown fox jumps over the lazy dog.

C#

Starter~2h

Classify a delivery drop-off location into the correct fee tier based on its distance from the warehouse.

C#

Standard~3h

Calculate the date of scheduled deployment windows. Typically deployment windows happen on the same day of the week. In this exercise, you will take a description of a deployment window date, and return the actual deployment date.

C#

Standard~3h

Refactor an expense report formatter. The expense report exercise is a refactoring exercise. There is code that prints a nicely formatted expense report, given a locale (American or Dutch) and a currency (US dollar or euro).

C#

Starter~2h

A maritime signal station transmits messages using a sequence of signal flags. A numeric transmission code determines which flags to raise and in what order.

C#

Advanced~4h

Determine which team controls each zone on a contested grid. In a grid claim competition two teams—Black (B) and White (W)—place markers on a rectangular grid. A contiguous group of empty cells that is completely enclosed (horizontally and vertically) by one t…

C#

Standard~3h

Identify grid crossovers in an operations matrix. A grid crossover is a cell whose value is greater than or equal to every value in its row and less than or equal to every value in its column.

C#

Standard~3h

In a grid hunt challenge you scan a rectangular field of characters to locate hidden target strings.

C#

Starter~2h

Implement a Steps method that computes how many cascade steps a hailstone particle takes to reach unit mass.

C#

Standard~3h

Implement the response logic for a basic help-desk chatbot. The bot handles incoming support messages and replies with one of five canned responses based on the message content.

C#

Standard~3h

An internal post-mortem tool reconstructs incident chains. Each step in the chain describes an event and how it caused the next, building a cumulative narrative from the root cause forward.

C#

Advanced~4h

An invoicing system needs to print amounts in words on official documents. Given an integer from 0 to 999,999,999,999, return its English representation.

C#

Standard~3h

Compile a standings table from match results for a small sports league. Given a list of match results, produce a formatted standings table. Each result line contains two team names and an outcome, separated by semicolons:

C#

Standard~3h

Simulate a ledger account supporting opening, closing, withdrawals, and deposits of money. Watch out for concurrent transactions!

C#

Standard~3h

Implement the logic of a letter-lock word puzzle. A letter lock is a combination lock whose tumblers are letters instead of digits. The solver guesses one letter at a time. Each correct guess reveals every occurrence of that letter in the secret word.

C#

Standard~3h

Your team needs a lightweight log scanning tool. Given one or more server log files, scan for lines that match a user-provided pattern and return the results as a single string.