Screen C candidates on real starter repos

C

Standard~3h

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

Starter~2h

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

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

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

You are building a deployment scheduling tool for a platform engineering team. Deployments follow a recurring calendar pattern: the team always deploys on a specific weekday occurrence within a month (e.g.

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

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

Starter~2h

Implement a steps function 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 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

Advanced~4h

Implement a dependency graph of source and derived metrics with subscriber notifications.

C

Starter~2h

Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.

C

Starter~2h

Build a reverse-lookup priority index from a grouped priority table. Internal operations tools often store alert or diagnostic codes grouped by priority tier. A legacy configuration maps each integer priority to a concatenated string of uppercase codes that sh…

C

Starter~2h

A product team tracks how quickly a release ages across several cadence tiers. Given an age in seconds, calculate how old that release would be on:

C

Standard~3h

You are auditing a service's observability configuration. Each service carries a single numeric score that encodes which sensitivity levels are currently active.

C

Starter~2h

Add the adjacent hazard counts to a completed Sensor Grid board. Sensor Grid is a popular game where the user has to find the hazards using numeric hints that indicate how many hazards are directly adjacent (horizontally, vertically, diagonally) to a square.

C

Starter~2h

Implement a shift_clock that represents a time-of-day on a 24-hour schedule, without any date component.

C

Starter~2h

Write a function to convert channel numbers into signal notation. A legacy radio signaling system encodes channel numbers using a compact notation built from 7 symbols: I, V, X, L, C, D, M.

C

Standard~3h

A monitoring console stores outgoing alert messages in a compact columnar format called a signal weave.

C

Starter~2h

A support dashboard turns certain factors into status signals. The rules of status-signals are that if a given number:

C

Starter~2h

You are building a diagnostic tool for a network traffic monitor. The monitor records packet counts across 64 consecutive time slots. Due to a burst pattern, the number of packets in each slot is exactly double the previous slot, starting with 1 packet in the…

C

Starter~2h

Implement a warehouse rover controller. A fulfillment center uses autonomous rovers to fetch items from shelving aisles. Before deploying a rover to the floor, the control software needs to verify that movement commands produce the expected outcomes.

C

Starter~2h

You are building a patrol planning tool for a network of watchtowers on an 8×8 observation grid.

C

Standard~3h

Implement a wave signal mixer that models two-component signals. In signal processing, a wave can be represented by two components: an in-phase component (real) and a quadrature component (imaginary).