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Lessons (11)

• Domain-Driven Design: Tactical Patterns

  … No more re-validating strings all over the code. Aggregates: the consistency boundary ⭐ An aggregate is a group …

• Finding Service Boundaries with DDD

  … references by ID only Aggregate rules of thumb: - Keep aggregates small . - Reference other aggregates by ID , not by …

• SQL Interview Query Drills

  … define grouping, compute an aggregate, then filter with a clear tie policy](/img/database-interviews/sql-drills.svg …

• Replication, Partitioning & Sharding

  … Prefer colocating related data, asynchronous aggregates and explicit workflows. Do not shard because it sounds scalable; exhaust indexing …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … filtering, mapping, joining streams, windowed aggregations, with exactly-once support. No separate cluster needed; it runs inside your …

• API Gateway, BFF & Service Discovery

  … routing, auth, rate limiting, TLS, aggregation. Keep business logic out. - A BFF tailors an API to one client …

• What Is Apache Kafka?

  … tracking clicks, page views, searches Log and metrics aggregation logs from 1,000 servers Stream processing real-time …

• CQRS & Event Sourcing

  … for queries. mermaid flowchart LR C[Command] -- A["Aggregate<br/ (rebuilt from events)"] -- new events ES[(Event store …

• Choosing an Architecture

  … business?"] -- A3["DDD strategic (boundaries)<br/ DDD tactical (aggregates…)"] You pick an answer to each question. For example …

• Data in Microservices: Sagas & the Outbox Pattern

  … cus 7', 8997, 'PENDING'); INSERT INTO outbox (id, aggregate id, type, payload, created at) VALUES (gen random uuid …

• Domain-Driven Design: Strategic Design

  … language, bounded contexts, context maps Entities, value objects, aggregates, repositories, domain events Answers Where do we draw boundaries …