13 lines
3.5 KiB
JSON
13 lines
3.5 KiB
JSON
{"id":"hard_001","project":"Ledger Double-Entry Reconciler","category":"financial_invariants","language":"python","spec":"Build a ledger reconciliation service with strict double-entry invariants, idempotent replay, rollback checkpoints, and mismatch diagnostics. Include batch import, partial failure recovery, and audit trail generation."}
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{"id":"hard_002","project":"Distributed Job Scheduler with Locks","category":"concurrency_coordination","language":"go","spec":"Build a distributed scheduler with per-resource mutex locks, lease renewal, deadlock avoidance ordering, and deterministic replay logs. Include node-local vs global lock semantics and conflict diagnostics."}
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{"id":"hard_003","project":"CRDT Note Sync Engine","category":"eventual_consistency","language":"rust","spec":"Build a CRDT-based collaborative notes backend with causal metadata, merge convergence proofs, tombstone compaction, and offline replay safety. Include deterministic conflict resolution tests."}
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{"id":"hard_004","project":"Saga Orchestrator for Order Fulfillment","category":"workflow_compensation","language":"java","spec":"Build an order saga orchestrator with compensating actions, timeout escalation, exactly-once message handling, and deterministic recovery after crash mid-saga."}
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{"id":"hard_005","project":"Policy-Aware Access Gateway","category":"policy_evaluation","language":"node","spec":"Build an access gateway that evaluates hierarchical allow/deny policies with shadow rules, policy versioning, and explainability traces for each decision."}
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{"id":"hard_006","project":"Streaming Fraud Detector","category":"streaming_state","language":"python","spec":"Build a streaming detector with keyed state windows, out-of-order event handling, watermark policy, and deterministic replay of historical events producing identical alerts."}
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{"id":"hard_007","project":"Schema-Evolution CDC Replicator","category":"schema_evolution","language":"go","spec":"Build a CDC replication worker that handles schema evolution, backfill merges, checkpoint consistency, and deterministic idempotent upsert/delete application under retries."}
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{"id":"hard_008","project":"Multi-Tenant Rate Limiter","category":"realtime_control","language":"rust","spec":"Build a multi-tenant limiter with token bucket + sliding window hybrid policy, burst fairness guarantees, and lock-free hot path with deterministic fallback under contention."}
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{"id":"hard_009","project":"Build Graph Incremental Executor","category":"long_range_planning","language":"cpp","spec":"Build an incremental build executor over a DAG with content-hash invalidation, topological scheduling, cycle diagnostics, and transactional rollback on failed node execution."}
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{"id":"hard_010","project":"Data Contract Enforcement Gateway","category":"contract_validation","language":"python","spec":"Build a gateway that validates incoming payloads against versioned contracts, performs semantic constraint checks, and emits deterministic remediation plans for incompatible changes."}
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{"id":"hard_011","project":"Secure Secret Rotation Controller","category":"security_workflow","language":"go","spec":"Build a secret rotation controller with staged rollout, canary verification, rollback triggers, and explicit blast-radius containment under failed rotations."}
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{"id":"hard_012","project":"Cross-Language Class Transpilation Harness","category":"codegen_parity","language":"python","spec":"Build a harness that transpiles class-heavy source modules across multiple target languages and validates class/method parity, constructor semantics, and roundtrip behavioral equivalence checks."}
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