Problems

15 problems for Forward Deployed Engineer. Read any of them; sign in to code, run and submit.

Flatten nested batchesLists and tuples · Loops and control flow~5 minBeginner
Collect every page from an APIPagination · HTTP and REST APIs~12 minEasy
Group-by aggregationSQL patterns in Python · ETL pipelines · Dictionaries~12 minEasy
Keep the latest event per IDDictionaries · ETL pipelines~10 minEasy
Parse a CSV export into typed recordsETL pipelines · Parsing text~12 minEasy
Read a nested value by pathJSON · Parsing text~12 minEasy
Render a prompt templateLLM integration · Strings · Regular expressions~12 minEasy
Clean a JSON Lines exportETL pipelines · JSON · Validation and schemas~20 minMedium
Repair structured output from an LLMLLM integration · JSON · Parsing text~20 minMedium
Validate a request against a schemaValidation and schemas · JSON~25 minMedium
Fit a conversation into a token budgetLLM integration · Time and space complexity~30 minHard
Sync through a rate-limited APIRate limiting · Retries and backoff · Pagination~35 minHard
Window functions in PythonSQL patterns in Python · Sorting · ETL pipelines~30 minHard
Orchestrate an agent's tool planAI agents and tools · Graphs · Retries and backoff~60 minExpert
Route MCP tool calls over JSON-RPCMCP and JSON-RPC · Validation and schemas · JSON~60 minExpert