Search

Lessons (40)

• Count, for_each, Functions, and Stable Identities

  … Further reading: [for each](https://developer.hashicorp.com/terraform/language/meta-arguments/for each), [functions](https://developer.hashicorp …

• Normalization & Denormalization

  … For each one document: 1. The normalized source of truth. 2. The event/transactional outbox or refresh job …

• Service Communication: Sync vs Async

  … Services talk to each other the same two ways. ![Synchronous calls wait for an answer; asynchronous messages don …

• Choosing an Architecture

  … A bicycle, a van, a bus and a plane are each perfect for some journeys and silly for …

• Sorting Algorithms

  … After each pass, the largest remaining item has floated to the end. js function bubbleSort(arr) { for (let …

• Topics, Partitions & Offsets

  … keep the latest per key For some topics you only care about the latest value for each key …

• Consumers & Consumer Groups

  … partitions each 4 1 partition each ✅ maximum parallelism 6 4 busy, 2 idle ❌ (no partition left for them …

• Data in Microservices: Sagas & the Outbox Pattern

  … Design compensations as business actions . Choreography saga (events) Each service listens for events and reacts. No central coordinator …

• S — Single Responsibility Principle

  … If the chef also did the accounting, then a new tax law would force a change in the …

• StatefulSets, DaemonSets, Jobs and CronJobs

  … stable identity for databases, one pod per node for agents, and run-to-completion tasks. A Deployment is …

• Advanced TypeScript for Frontend

  … The status field narrows the type for each branch. Use generics for reusable contracts Generics preserve information instead …

• API Gateway, BFF & Service Discovery

  How clients find the right service among dozens, and how services find each other. API gateways, Backends for …

• Vertical Slice Architecture & the Modular Monolith

  … Or by what you're shopping for : breakfast aisle, baking aisle, pet aisle. When you want to make …

• I — Interface Segregation Principle

  … Backend for Frontend (BFF): a mobile app and a web app each get an API shaped for their …

• N+1 Queries, Loading & Pagination

  … serializer reads order.customer for each order. That is 51 database queries for one request. With 100 web …

• What Is Apache Kafka?

  … Kept (for days, weeks, or forever) Multiple independent readers Needs one queue per reader ✅ Built in: each group …

• Train Your First Model from Scratch

  … 3f}") print(f"prediction for 7km={slope 7 + intercept:.2f} minutes") Understand each step 1. Initialize: start with …

• Kubernetes Cluster Architecture, Simply

  … choose a node for each pod Node- Node: pull image and start container Node- API: report pod status …

• Finding Service Boundaries with DDD

  … 4. Check the chattiness: if two services call each other for every request, they're probably one context …

• SQL vs NoSQL Databases

  Relational tables or flexible documents? Understand how each stores data, the four NoSQL families, ACID vs BASE, and …

• REST vs GraphQL vs gRPC

  Three popular ways for services to talk. See how each works, compare them side by side, and learn …

• Time, Consistency and Distributed Transactions

  … Use monotonic clocks for local elapsed durations, and versions or logical clocks for the ordering the domain actually …

• Containers at Scale: ECS Deep Dive and EKS

  Deploy ECS safely, scale it properly, compare it with EKS, and apply the production patterns for each. ECS …

• Neural Networks and Deep Learning

  … how each parameter contributed to the loss. 4. An optimizer updates parameters, often using a form of gradient …

• Message Queues & RabbitMQ

  … waiter doesn't stand in the kitchen waiting for each dish. They pin the order ticket on a …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … contracts for events Stores versioned Avro / Protobuf / JSON Schema definitions for each topic and enforces compatibility rules , so …

• Collaborative Document Editing & Real-Time Sync

  … 4. What changes for a 1 GB document? Split it into sections/blocks , each with its own CRDT …

• Microkernel (Plugin) Architecture

  … The phone maker doesn't rebuild the OS for each new app; apps plug in through a published …

• Deploying & Operating Microservices

  … 1), 25 000).unref(); // force-quit if it takes too long }); Key takeaways - Each service has its own …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … for await (const chunk of stream) , paginated API helpers. --- 4. Mediator ✈️ Analogy: Planes don't talk to each …

• 10,000 Users Do Not Need 10,000 Database Connections

  A practical mental model for connection pools, database pressure, query latency and safe scaling in Node.js applications …

• Frontend Testing Strategy

  … each bolt (unit), each engine (integration), and finally a test drive of the whole car (end-to-end …

• Recursion & Backtracking

  … Just focus on: "if I had the answer for n-1, how do I get the answer for …

• Python and Math Foundations with Runnable Examples

  … Use those same values for future data. Recomputing them using test data or each incoming batch changes the …

• Linked Lists

  A chain of nodes where each node points to the next. Learn how they differ from arrays, and …

• Dynamic Programming

  … house robber Rob houses in a row for maximum money, but never two neighbours. State: at each house …

• AWS: Start Here

  … On AWS, choose a service for each job: Part of the shop Example AWS choice Why it exists …

• Resilient Service Calls: Retries, Breakers and Load Shedding

  … Require idempotency before retrying writes; apply exponential backoff with jitter for appropriate transient failures. 3. Use bulkheads to …

• Brokers, Replication & Durability

  … In Kafka, every partition has one leader replica and several follower replicas on different brokers. ![Each partition has …

• Event-Driven Architecture

  Build systems where components react to events instead of calling each other. Broker vs mediator topologies, the four …