flink-principal-engineer
Principal/Senior-level Flink playbook for stream processing architecture, stateful pipelines, event-time correctness, checkpointing, scaling, and operating low-latency data platforms. Use when: designing streaming systems, reviewing stateful Flink jobs, tuning event-time pipelines, or operating Flink in production.
What this skill does
# Flink Mastery (Senior → Principal) ## Operate - Start from correctness model: event time, ordering, lateness, replay, and side-effect semantics. - Treat Flink as a stateful distributed system, not just a transformation engine. - Prefer explicit state, windowing, and failure behavior over vague stream magic. - Optimize for correctness first, then latency, then cost. ## Default Standards - State and checkpoint strategy must be explicit. - Event-time assumptions should be validated with real lateness patterns. - Backpressure and operator chaining require observability. - External side effects must be designed for retries and replay. - Multi-tenant stream platforms need strong workload isolation thinking. ## References - Stream architecture and operator design: [references/stream-architecture-and-operator-design.md](references/stream-architecture-and-operator-design.md) - State, checkpoints, and savepoint safety: [references/state-checkpoints-and-savepoint-safety.md](references/state-checkpoints-and-savepoint-safety.md) - Event time, watermarks, and lateness correctness: [references/event-time-watermarks-and-lateness-correctness.md](references/event-time-watermarks-and-lateness-correctness.md) - Backpressure, scaling, and performance tuning: [references/backpressure-scaling-and-performance-tuning.md](references/backpressure-scaling-and-performance-tuning.md) - Delivery semantics and external side effects: [references/delivery-semantics-and-external-side-effects.md](references/delivery-semantics-and-external-side-effects.md) - Multi-tenant governance and stream platform safety: [references/multi-tenant-governance-and-stream-platform-safety.md](references/multi-tenant-governance-and-stream-platform-safety.md) - Reliability and operations: [references/reliability-and-operations.md](references/reliability-and-operations.md) - Incident runbooks: [references/incident-runbooks.md](references/incident-runbooks.md)
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