Screen Elixir candidates on real starter repos

Elixir

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…

Elixir

Starter~2h

A legacy industrial robot controller receives a continuous stream of three-character instruction codes. Each triplet maps to a named operation. Your job is to build a decoder that translates individual codes and full instruction streams.

Elixir

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.

Elixir

Standard~3h

Calculate the date of scheduled deployment windows. Teams often deploy on the same day of the week each month. In this exercise, you will take a description of a deployment window date and return the actual date.

Elixir

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.

Elixir

Starter~2h

Implement a HailstoneCascade.steps/1 function that computes how many cascade steps a hailstone particle takes to reach unit mass.

Elixir

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:

Elixir

Standard~3h

Read the digits shown on an industrial meter's segment display. Each digit is represented as a 3-column x 4-row pattern of pipes, underscores, and spaces.

Elixir

Starter~2h

The [parcel reference code verification process](https://en.wikipedia.org/wiki/International_Standard_Book_Number) is used to validate book identification numbers. These normally contain dashes and look like: 3-598-21508-8

Elixir

Starter~2h

Given a layout diagram, determine which plants belong to each tenant in a shared rooftop planter.

Elixir

Starter~2h

Build a priority index that maps individual codes to their priority levels. Your team maintains an internal incident management tool that groups alert codes by priority level.

Elixir

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:

Elixir

Standard~3h

Arrange route segments into a circular path. You're given a collection of bidirectional route segments. Each segment connects two numbered stops — for example, a segment {2, 3} connects stop 2 to stop 3 and can be traversed in either direction.

Elixir

Standard~3h

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies. An allergy test produces a single numeric score which contains the information about all the allergies the person has (that they were t…

Elixir

Advanced~4h

Add the adjacent hazard counts to a completed Sensor Grid board. Sensor Grid is an operations dashboard that uses numeric hints to show how many hazards are directly adjacent (horizontally, vertically, diagonally) to a square.

Elixir

Advanced~4h

Score a service scorecard. Service scorecards use the same scoring rules as the original bowling exercise, but the story is operational instead of a game. Keep track of the score across 10 windows and apply the same spare and strike bonuses.

Elixir

Standard~3h

Your team maintains a mesh-network relay that transmits short text messages across low-bandwidth channels. Before transmission each message is woven — cleaned, arranged into a rectangular frame, then read column-by-column so characters are spread across time s…

Elixir

Starter~2h

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

Elixir

Starter~2h

A social media post has gone viral. Every minute since it was published, the number of new views doubles compared to the previous minute.

Elixir

Standard~3h

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.

Elixir

Standard~2h

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

Elixir

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).