ZipRecruiter OA 4 Questions Pass | Full Review Programming Logic Questions + High Score Passing Tips

Recently finished ZipRecruiter 's 2026 NG OA is one of those "graded unlock" questions - you can't see question 2 until you've done question 1. This time, I did all four questions in AC, and the overall difficulty is medium to easy, but the logic is abstract and the implementation should be rigorous. The following is a detailed review + a modified version of the new question data, for those who want to prepare for OA, you can refer to it directly.

ZipRecruiter OA Overview

Level 1 - Basic CRUD Operations

Problem Description

Implement a basic in-memory database that supports the following operations.

set(key: str, field: str, value: str) -> None
get(key: str, field: str) -> str | None
delete(key: str, field: str) -> bool

Requirements.

• Each record is identified by a unique key.
• Each record contains multiple field-value pairs.
• set() inserts or updates the field.
• get() retrieves the value if it exists.
• delete() removes the field if it exists and returns a boolean.

Example (with updated data)

Level 2 - Scanning and Prefix Filtering

Problem Description

Extend your in-memory database to support listing fields and filtering by prefix.

scan(key: str) -> list[str]
scan_by_prefix(key: str, prefix: str) -> list[str]

Requirements.

• scan() returns all fields for a given key in lexicographic order.
• scan_by_prefix() returns only fields starting with the given prefix.
• The output format should be.
  ["()", ...]

Example (with updated data)

Level 3 - Timestamps and TTL Management

Problem Description

Introduce timestamps and Time-To-Live (TTL) logic for all data operations.
Each operation now includes a timestamp parameter, and records with TTLs should expire after their valid period.

New Methods.

set_at(key: str, field: str, value: str, timestamp: int) -> None
set_at_with_ttl(key: str, field: str, value: str, timestamp: int, ttl: int) -> None
get_at(key: str, field: str, timestamp: int) -> str | None
delete_at(key: str, field: str, timestamp: int) -> bool

Example (updated dataset)

Implementation Notes.

• Each field can be represented as.

db[key][field] = {"val": value, "start": timestamp, "ttl": ttl or None}

Expired when. current_timestamp >= start + ttl

Always clean up expired entries before every operation.

Level 4 - Backup and Restore Functionality

Problem Description

Add backup and restore features to maintain database snapshots over time.

New Methods.

backup(timestamp: int) -> int
restore(timestamp: int, timestamp_to_restore: int) -> None

Example (updated data)

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