{ "policy": { "version": 5, "patterns": { "version": 1, "method": "CURATED_PRACTICE_TOPIC", "notice": "Pattern topics identify design choices to practice. Read the ticket's acceptance criteria and justify the simplest suitable approach. Tags are not capability or ownership evidence; an untagged ticket has no curated pattern topic assigned." }, "fieldMix": { "version": 1, "method": "CURATED_ESTIMATE", "notice": "Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence." }, "contentStatus": "PRACTICE_BRIEF", "assessmentStatus": "NOT_QUALIFIED", "evidenceUse": "NONE", "aiPolicy": "AI tools are welcome during implementation. Record assumptions, review the result, and verify its behavior.", "notice": "Fictional engineering practice briefs. Starter repositories, fixtures, automated grading, and verified ownership are not included.", "outcomeEvidence": "Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.", "ownershipEvidence": "Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence." }, "patternTopics": [ { "id": "factory-method", "label": "Factory Method", "group": "Creational" }, { "id": "abstract-factory", "label": "Abstract Factory", "group": "Creational" }, { "id": "builder", "label": "Builder", "group": "Creational" }, { "id": "prototype", "label": "Prototype", "group": "Creational" }, { "id": "singleton", "label": "Singleton", "group": "Creational" }, { "id": "adapter", "label": "Adapter", "group": "Structural" }, { "id": "bridge", "label": "Bridge", "group": "Structural" }, { "id": "composite", "label": "Composite", "group": "Structural" }, { "id": "decorator", "label": "Decorator", "group": "Structural" }, { "id": "facade", "label": "Facade", "group": "Structural" }, { "id": "flyweight", "label": "Flyweight", "group": "Structural" }, { "id": "proxy", "label": "Proxy", "group": "Structural" }, { "id": "chain-of-responsibility", "label": "Chain of Responsibility", "group": "Behavioral" }, { "id": "command", "label": "Command", "group": "Behavioral" }, { "id": "interpreter", "label": "Interpreter", "group": "Behavioral" }, { "id": "iterator", "label": "Iterator", "group": "Behavioral" }, { "id": "mediator", "label": "Mediator", "group": "Behavioral" }, { "id": "memento", "label": "Memento", "group": "Behavioral" }, { "id": "observer", "label": "Observer", "group": "Behavioral" }, { "id": "state", "label": "State", "group": "Behavioral" }, { "id": "strategy", "label": "Strategy", "group": "Behavioral" }, { "id": "template-method", "label": "Template Method", "group": "Behavioral" }, { "id": "visitor", "label": "Visitor", "group": "Behavioral" }, { "id": "ports-and-adapters", "label": "Ports and Adapters", "group": "Architectural" }, { "id": "cqrs", "label": "CQRS", "group": "Architectural" }, { "id": "strangler-fig", "label": "Strangler Fig", "group": "Architectural" }, { "id": "saga", "label": "Saga", "group": "Distributed and reliability" }, { "id": "transactional-outbox", "label": "Transactional Outbox", "group": "Distributed and reliability" }, { "id": "circuit-breaker", "label": "Circuit Breaker", "group": "Distributed and reliability" }, { "id": "bulkhead", "label": "Bulkhead", "group": "Distributed and reliability" } ], "projects": [ { "id": "2f2e66a5-cabc-4b08-b389-3e4ca4825dab", "key": "BCOST", "title": "Object-storage cost controls", "field": "Cloud infrastructure", "summary": "Make storage growth and transfer costs inspectable without compromising retained records.", "context": "A fictional analytics service stores exports and intermediate artifacts indefinitely. Finance sees a rising bill but engineers cannot explain which lifecycle policy is responsible.", "stack": [ "TypeScript", "S3-compatible storage", "CSV" ], "prerequisites": [ "Create synthetic object inventories and a local object-store double; author fictional unit prices as explicit assumptions." ], "developerValue": "Practice cost attribution, lifecycle modeling, and safe retention controls.", "companyValue": "Produce reviewable storage-cost options with recovery and data-retention consequences.", "delivery": "Deliver an offline cost model and local policy rehearsal; delete no real cloud objects.", "phases": [ { "id": "inventory", "title": "Attribute storage", "goal": "Describe objects, ownership, and cost assumptions." }, { "id": "control", "title": "Model lifecycle changes", "goal": "Evaluate retention and transfer controls safely." }, { "id": "review", "title": "Review savings proposals", "goal": "Compare options and expose uncertainty." } ], "tickets": [ { "id": "8ffb3566-63c9-4e68-a67f-cfb1406692bb", "key": "BCOST-101", "title": "Normalize object inventory units and ownership labels", "type": "TASK", "priority": "MEDIUM", "difficulty": "FOUNDATIONAL", "estimateMinutes": 60, "phaseId": "inventory", "dependsOn": [], "scenario": "Inventory exports mix byte counts, rounded sizes, and missing owners.", "acceptanceCriteria": [ "Use bytes as the canonical size unit.", "Separate unknown owners from shared infrastructure.", "Preserve inventory time and source identity." ], "implementationNotes": [ "Use synthetic names without customer identifiers." ], "verification": [ "Normalize mixed display units accurately.", "Reject negative sizes and report missing ownership." ], "deliverables": [ "Inventory parser." ], "rollout": "Run read-only attribution before proposing lifecycle changes.", "skills": [ "Data normalization" ], "fieldMix": [ { "field": "Data engineering", "percentage": 60 }, { "field": "Cloud infrastructure", "percentage": 40 } ], "patterns": [] }, { "id": "ed66d2df-c232-4173-ac0c-e1a69d36e525", "key": "BCOST-102", "title": "Model storage, requests, and transfer costs separately", "type": "TASK", "priority": "MEDIUM", "difficulty": "INTERMEDIATE", "estimateMinutes": 120, "phaseId": "inventory", "dependsOn": [ "BCOST-101" ], "scenario": "A storage-only estimate ignores the cost of regenerating and downloading exports.", "acceptanceCriteria": [ "Version explicit fictional unit-price assumptions.", "Calculate each cost component separately.", "Show unknown request or transfer volume." ], "implementationNotes": [ "Do not present modeled savings as observed billing results." ], "verification": [ "Reconcile a hand-calculated synthetic example.", "Refuse a total when a required unit conversion is ambiguous." ], "deliverables": [ "Offline cost calculator." ], "rollout": "Keep original assumptions with every report.", "skills": [ "Cost modeling" ], "fieldMix": [ { "field": "Cloud infrastructure", "percentage": 100 } ], "patterns": [] }, { "id": "fe92ac53-95bb-4418-b74a-0e8676787b54", "key": "BCOST-103", "title": "Classify objects by recovery and retention requirements", "type": "TASK", "priority": "HIGH", "difficulty": "ADVANCED", "estimateMinutes": 180, "phaseId": "control", "dependsOn": [ "BCOST-101" ], "scenario": "A broad expiry rule would remove the only copy of finalized reports.", "acceptanceCriteria": [ "Distinguish authoritative, reproducible, and temporary objects.", "Attach minimum retention and recovery requirements.", "Block lifecycle proposals for unclassified objects." ], "implementationNotes": [ "Retention requirements are scenario inputs, not legal advice." ], "verification": [ "Allow expiry of a declared temporary object.", "Block deletion of an authoritative unclassified report." ], "deliverables": [ "Object lifecycle classification." ], "rollout": "Start with temporary classes only; preserve unknown objects.", "skills": [ "Data lifecycle" ], "fieldMix": [ { "field": "Storage systems", "percentage": 50 }, { "field": "Cloud infrastructure", "percentage": 30 }, { "field": "Site reliability", "percentage": 20 } ], "patterns": [] }, { "id": "74f448e4-1a40-4ef2-a781-5df103e310a8", "key": "BCOST-104", "title": "Simulate lifecycle transitions before object deletion", "type": "TASK", "priority": "HIGH", "difficulty": "INTERMEDIATE", "estimateMinutes": 150, "phaseId": "control", "dependsOn": [ "BCOST-103" ], "scenario": "Operators cannot see which objects a new rule would affect.", "acceptanceCriteria": [ "Produce a dry-run object set and byte total.", "Bind the plan to inventory and policy digests.", "Reject execution if the reviewed plan is stale." ], "implementationNotes": [ "The exercise uses only a disposable local object store." ], "verification": [ "Preview an eligible temporary set.", "Change policy inputs and reject the stale plan." ], "deliverables": [ "Lifecycle dry-run planner." ], "rollout": "Require review of the exact plan; keep deletion disabled by default.", "skills": [ "Change safety", "Integrity" ], "fieldMix": [ { "field": "Cloud infrastructure", "percentage": 40 }, { "field": "Storage systems", "percentage": 40 }, { "field": "Security", "percentage": 20 } ], "patterns": [] }, { "id": "7ccebcaf-4884-48ce-b6c8-9c5a8c2e592c", "key": "BCOST-105", "title": "Account for retrieval delay in colder storage proposals", "type": "TASK", "priority": "HIGH", "difficulty": "ADVANCED", "estimateMinutes": 180, "phaseId": "control", "dependsOn": [ "BCOST-102", "BCOST-103" ], "scenario": "A cheaper storage tier may violate the reporting team's recovery expectations.", "acceptanceCriteria": [ "Model retrieval time and per-request charges explicitly.", "Compare ordinary access and restore scenarios.", "Exclude objects whose declared recovery target is incompatible." ], "implementationNotes": [ "Use simulated tier behavior and labeled assumptions." ], "verification": [ "Compare two fictional tier policies.", "Reject a cheap option that misses the recovery requirement." ], "deliverables": [ "Tier tradeoff report." ], "rollout": "Pilot only reproducible artifacts with a tested restore path.", "skills": [ "Cloud economics", "Recovery" ], "fieldMix": [ { "field": "Cloud infrastructure", "percentage": 50 }, { "field": "Storage systems", "percentage": 30 }, { "field": "Site reliability", "percentage": 20 } ], "patterns": [] }, { "id": "21766ec3-6407-476b-b32b-2ede6c058380", "key": "BCOST-106", "title": "Bound export retention per tenant without crossing ownership", "type": "TASK", "priority": "HIGH", "difficulty": "ADVANCED", "estimateMinutes": 180, "phaseId": "control", "dependsOn": [ "BCOST-104" ], "scenario": "One tenant's cleanup job selects similarly named exports belonging to another.", "acceptanceCriteria": [ "Scope inventory and policy evaluation by tenant identity.", "Use opaque object references rather than name prefixes alone.", "Audit planned and completed cleanup identities." ], "implementationNotes": [ "Repository boundaries must enforce scope." ], "verification": [ "Expire eligible exports for one tenant.", "Attempt cross-tenant cleanup and verify denial." ], "deliverables": [ "Scoped retention evaluator." ], "rollout": "Trial on one synthetic tenant; stop on inventory discrepancies.", "skills": [ "Authorization", "Storage" ], "fieldMix": [ { "field": "Security", "percentage": 50 }, { "field": "Storage systems", "percentage": 30 }, { "field": "Cloud infrastructure", "percentage": 20 } ], "patterns": [] }, { "id": "3230ee07-e9a3-4309-a026-54745bf9b181", "key": "BCOST-107", "title": "Reduce repeated downloads with integrity-aware caching", "type": "TASK", "priority": "MEDIUM", "difficulty": "INTERMEDIATE", "estimateMinutes": 150, "phaseId": "control", "dependsOn": [ "BCOST-102" ], "scenario": "Unchanged exports are repeatedly transferred because clients cannot validate their cache.", "acceptanceCriteria": [ "Expose stable content validators for immutable exports.", "Honor conditional reads correctly.", "Invalidate cached authority when access is revoked." ], "implementationNotes": [ "A content digest is not an access credential." ], "verification": [ "Return unchanged status for an authorized matching validator.", "Deny a revoked client despite its cached validator." ], "deliverables": [ "Conditional-download contract." ], "rollout": "Enable for immutable exports first; retain full-download fallback.", "skills": [ "HTTP caching", "Authorization" ], "fieldMix": [ { "field": "Performance engineering", "percentage": 40 }, { "field": "API design", "percentage": 30 }, { "field": "Security", "percentage": 30 } ], "patterns": [] }, { "id": "4cd1c3f0-0d09-4564-abdc-422e7832c9bc", "key": "BCOST-108", "title": "Compare retention changes against rebuild workload and budget", "type": "TASK", "priority": "HIGH", "difficulty": "EXPERT", "estimateMinutes": 300, "phaseId": "review", "dependsOn": [ "BCOST-105", "BCOST-106", "BCOST-107" ], "scenario": "Deleting intermediate files saves storage but may shift cost into repeated computation.", "acceptanceCriteria": [ "Model storage, rebuild, transfer, and operational effort together.", "Run bounded local rebuild measurements with declared inputs.", "Show uncertainty ranges and excluded costs." ], "implementationNotes": [ "No claim of real bill reduction from synthetic data." ], "verification": [ "Compare a retained and regenerated artifact policy.", "Expose the case where regeneration costs more." ], "deliverables": [ "Cost-control decision record." ], "rollout": "Choose a reversible policy for reproducible data; preserve authoritative copies.", "skills": [ "Tradeoff analysis", "FinOps" ], "fieldMix": [ { "field": "Cloud infrastructure", "percentage": 50 }, { "field": "Performance engineering", "percentage": 30 }, { "field": "Storage systems", "percentage": 20 } ], "patterns": [] }, { "id": "00feb5e4-5a7e-4003-87d2-0391784933e4", "key": "BCOST-109", "title": "Add budget alerts that distinguish actual and forecast usage", "type": "STORY", "priority": "MEDIUM", "difficulty": "INTERMEDIATE", "estimateMinutes": 120, "phaseId": "review", "dependsOn": [ "BCOST-108" ], "scenario": "A forecast estimate appears in the same chart as already-incurred usage.", "acceptanceCriteria": [ "Label measured inventory cost and forecast separately.", "Define alert thresholds and data freshness.", "Avoid duplicate alerts for one reporting window." ], "implementationNotes": [ "Alerts remain local outputs; send no external notifications." ], "verification": [ "Trigger a synthetic budget threshold.", "Show stale inventory as uncertain instead of a current total." ], "deliverables": [ "Budget alert fixtures." ], "rollout": "Run advisory reports before operational notification wiring.", "skills": [ "Observability", "Cost controls" ], "fieldMix": [ { "field": "Cloud infrastructure", "percentage": 60 }, { "field": "Site reliability", "percentage": 40 } ], "patterns": [] }, { "id": "4ad505bc-1447-4556-a6f5-a7f2cf9a645b", "key": "BCOST-110", "title": "Document restoration before approving local expiry rules", "type": "CHORE", "priority": "LOW", "difficulty": "FOUNDATIONAL", "estimateMinutes": 60, "phaseId": "review", "dependsOn": [ "BCOST-109" ], "scenario": "Cleanup reviewers need to understand which deleted artifacts can be recreated.", "acceptanceCriteria": [ "Identify rebuild inputs and commands.", "State unrecoverable classes explicitly.", "Include the latest dry-run plan identity." ], "implementationNotes": [ "Do not promise recovery without retained inputs." ], "verification": [ "Rebuild an expired synthetic intermediate artifact.", "Reject expiry when required rebuild inputs are absent." ], "deliverables": [ "Retention review checklist." ], "rollout": "Attach to policy proposals and re-review after input changes.", "skills": [ "Runbooks" ], "fieldMix": [ { "field": "Site reliability", "percentage": 50 }, { "field": "Cloud infrastructure", "percentage": 30 }, { "field": "Storage systems", "percentage": 20 } ], "patterns": [] } ] } ] }