take-homes
Build it in your editor. We grade the upload.
Authored projects with a frozen variant, public tests you can run locally, and hidden tests that never leave the server. Pull them with Cursor, Codex, or the BlankCode CLI. The agent may not write src/.
13 templates · MCP on /connect · blankcode projects start <slug>
Bounded async worker pool
bounded-worker-pool · hard · typescript
Coupon pricing engine
coupon-pricing-engine · hard · typescript
Late-event ingestion
late-event-ingestion · hard · typescript
Nitro signed download tickets
nitro-signed-download-tickets · hard · typescript
Reproducible dataset lineage planner
reproducible-dataset-lineage · hard · typescript
Tenant authz, pagination, consistency
access-slice · very_hard · typescript
Trace SLO rollup
trace-slo-rollup · hard · typescript
Webhook delivery
webhook-delivery · hard · typescript
Evaluation review ledger
eval-review-ledger · hard · typescript
Incremental search index
incremental-search-index · hard · typescript
LRU cache with expiry
lru-ttl-cache · hard · typescript
Reliable Node webhook receiver
reliable-webhook-receiver · medium · node
Tenant-safe GraphQL gateway
tenant-graphql-gateway · very_hard · typescript
Sign in to start an assignment. The work happens in your editor.