You're handed docs for an API you've never seen: use it to find the shortest path between two nodes
Palantir's signature coding genre isn't an algorithm; it's working from unfamiliar documentation: a graph API, a custom serialization spec, a mini query language. The behaviors graders score, plus the BFS-over-an-opaque-client worked example.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
Palantir's signature coding genre isn't an algorithm; it's working from unfamiliar documentation: a graph API, a custom serialization spec, a mini query language. The behaviors graders score, plus the BFS-over-an-opaque-client worked example.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.
