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Lessons (23)

• YAGNI: You Aren't Gonna Need It

  … Think these through. - Known, committed requirements: if it's on this sprint's board, it's not speculation …

• System Design Interview Framework

  … clarify requirements, estimate scale, draw the core path, then deep dive into risks and recovery](/img/system-design …

• Debug Latency Like an Investigator

  High CPU is not required for high latency. Follow percentile shape and trace wait time before scaling blindly …

• Monolith vs Microservices

  … different release speeds or different technology . - Fault isolation requirements: payments must keep working when recommendations are down. ❌ Bad …

• REST vs GraphQL vs gRPC

  … HTTP HTTP/2 Contract OpenAPI (optional) Schema (required) .proto (required) Data fetched Server decides Client decides Server decides …

• TypeScript Essentials

  … transform existing types Utility Result Example use --- --- --- Partial<User All fields optional PATCH request body Required<User All …

• REST API Design

  … path, required: true, schema: { type: string } } responses: "200": { description: The user, content: { application/json: { schema: { $ref: " /components/schemas …

• CQRS & Event Sourcing

  … the user's own change. 💡 CQRS doesn't require separate databases. Even separate classes for reads and writes …

• D — Dependency Inversion Principle

  … When --- --- --- Constructor new OrderService({ repo, mailer }) Most common, required dependencies Function parameter placeOrder(order, { mailer }) Functional code DI …

• React vs Vue vs Angular

  … Language JS or TS JS or TS TypeScript (required) Reactivity Re-render + diff Proxy-based tracking Signals State …

• L — Liskov Substitution Principle

  … instanceof ChildClass?"} -- yes V Q3{"Does the child require MORE<br/ or return LESS than the parent?"} -- yes …

• What Is Apache Kafka?

  … Adding a new consumer requires zero changes to the producers. Core vocabulary Term Meaning Analogy --- --- --- Event / record / message …

• Brokers, Replication & Durability

  … KRaft (Kafka 3.3+, required in 4.0)"] CQ["Controller quorum<br/ (Raft consensus)"] <-- KB2[Brokers] end Kafka …

• Kubernetes Cluster Architecture

  … Docker images work fine; Docker itself isn't required) kube-proxy Programs networking rules so traffic to a …

• Kafka Producers

  … true default since Kafka 3.0 acks=all required for idempotence retries=2147483647 max.in.flight.requests.per …

• Microkernel (Plugin) Architecture

  … Isolate plug-in failures (and, for third parties, security). - Use it when extensibility and variation are real requirements.

• Deploying & Operating Microservices

  … a new event type Make an optional field required Accept new optional input Change what an error code …

• What Is Software Architecture?

  … Architecture is mostly driven by these. Attribute Question Example requirement --- --- --- Performance How fast? p95 page load under 300 …

• Serverless Architecture

  … paths where cold starts hurt, and strict portability requirements. Key takeaways - Serverless = FaaS (functions triggered by events) + BaaS …

• Creational Patterns: How to Make Objects

  … this. config.url) throw new Error("url is required"); return Object.freeze({ ...this. config }); } } const request = new RequestBuilder …

• Normalization & Denormalization

  … one row, and creating a product does not require inventing an order. BCNF: every determinant is a candidate …

• Choosing an Architecture

  … company. Evolutionary architecture Architecture isn't decided once. Requirements, scale and teams change, so design for change : mermaid …

• React Hooks in Practice

  … They let small functions do what used to require classes. ![Which hook do I need?](/img/frontend/hooks …