Simple Binary Encoding

What this binary message-parsing C++ problem tests

This is a medium-difficulty coding problem that quantitative trading firms use to assess whether you can translate a binary protocol specification into correct, production-grade C++ code. It combines struct layout, endianness handling, and careful validation logic—all critical skills in low-latency trading systems where data moves in compact binary frames rather than human-readable JSON.

The problem requires you to deserialize a fixed header followed by variable-length repeating groups, validate the message structure against a schema, and safely extract typed fields from a raw byte stream. Strong solutions demonstrate careful boundary checking, correct little-endian byte interpretation, and robust handling of incomplete or malformed input. Interviewers often probe your reasoning about struct alignment, how you manage the offset pointer as you traverse the payload, and how you confirm that declared message length matches actual data available.

• Binary struct deserialization and endianness
• Validating header and message integrity
• Parsing variable-length repeating groups at runtime
• Handling incomplete or invalid protocol frames