Screen Java candidates on real starter repos

Java

Starter~2h

Your task is to convert an alert code number into a string of alarm chime sounds.

Java

Standard~3h

The archive code verification process is used to validate catalog identifiers. These usually contain dashes and look like: 3-598-21508-8.

Java

Standard~3h

Convert a number, represented as a sequence of digits in one base, to another base by following a base trail.

Java

Advanced~4h

A maintenance beacon board spells out numbers using a 3 x 4 grid of pipes, underscores, and spaces. Decode the digits, preserve any unreadable glyphs as ?, and join multiple rows with commas.

Java

Starter~2h

Track a signal beacon that awards points based on how close a shot lands to the center of a circular target.

Java

Advanced~4h

Your team is building the ranking engine for an online auction platform. Each bid submitted to an auction carries five value tokens -- compact codes composed of a level indicator and a category letter (e.g. 4S 5H 7C 8D JC).

Java

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.

Java

Advanced~4h

Determine the exact date of recurring calendar anchor events. Many organisations schedule recurring events that always fall on the same day of the week within a given month.

Java

Starter~2h

Given a radio call sign, compute its transmission score. Each letter contributes points according to this chart:

Java

Advanced~3h

Build a campus ledger that keeps track of students and the program level they are assigned to.

Java

Advanced~4h

Encode a secret dispatch using a cipher grid. Given some English text, output its encoded form.

Java

Starter~2h

Your field team communicates using a cipher handshake — a sequence of physical gestures encoded as a single integer. Each bit in the binary representation of the integer triggers a specific gesture:

Java

Standard~3h

You are building an internal search engine for a digital library archive. Scholars need a tool that searches manuscript files for passages matching a regular expression pattern. Return the line number and contents of each matching passage.

Java

Starter~2h

Translate RNA sequences into a codon chorus. RNA is read three bases at a time. Each codon maps to a protein name, and translation stops as soon as a stop codon appears.

Java

Standard~3h

A shipboard comms navigator keeps answers short. They answer Sure. if you ask them a question.

Java

Starter~2h

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

Java

Starter~2h

Given an age in seconds, calculate how old someone would be on a set of celestial reference worlds:

Java

Standard~3h

Implement a RESTful API for managing a shared dinner tab. Four roommates split meals together often, and they need a reliable way to keep track of who paid, who still owes money, and how the running balances change over time.

Java

Advanced~4h

A vending machine must return exact change using the fewest possible items from its available denominations. Your task is to implement the logic that computes the optimal combination.

Java

Starter~2h

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

Java

Standard~3h

Implement functions to recite any verse, a range of verses, or the full lyrics of 'The Twelve Days of Christmas'.

Java

Standard~3h

Generate the verses of a cumulative song about a lighthouse keeper trying to keep a harbor signal line in working order.

Java

Standard~3h

Tally the results of a round-robin sports league into a formatted standings table.

Java

Standard~3h

Build a small mission-control error router. Each operation represents a different launch-control failure path. Your job is to implement methods that raise the correct exception type, preserve any detail message that is provided, and safely parse numeric teleme…

Java

Advanced~4h

Solve the Precinct Lineup logic puzzle by deducing who drinks water and who owns the parrot from a set of constraint clues.

Java

Advanced~4h

Build a small press-room renderer. The press team writes updates in a lightweight markup language and wants them turned into HTML. Your task is to implement the parser so that headings, paragraphs, unordered lists, bold text, and italic text are rendered consi…

Java

Standard~3h

A radar field marks nearby mines with numeric pings. Given a completed rectangular grid of spaces and asterisks, count how many mines touch each empty cell horizontally, vertically, or diagonally, and return the annotated grid.

Java

Advanced~4h

A control room keeps a ring of relay tokens in storage. Each token has two ports, and the collection must be arranged so that adjacent tokens connect cleanly and the ring closes back on itself.

Java

Standard~3h

An ancient order of scholars communicates using riddle ciphers — arithmetic puzzles where every letter stands for a unique digit. Your task is to crack the cipher and reveal the hidden numbers.