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Lessons (40)

• AI Agents and Tool Use

  … use an agent Use tool calling when a model needs to select from a small set of useful …

• State Management (Redux, Zustand, TanStack Query)

  … const count = useCartStore((state) = state.items.length); const add = useCartStore((state) = state.add); Global client state: Redux Toolkit …

• Choosing a Programming Language

  … ML, APIs Microservices, CLIs, cloud tooling Performance-critical, systems, WASM Famous users VS Code, Slack desktop Instagram, most …

• What to Learn in AI, and in What Order

  … AI is a broad field, not one tool or one course. A useful way to learn it is …

• AI Evaluation, Safety, and Security

  … For tool use, test argument validation, authorization, retries, timeouts, and harmful actions. Measure latency and cost alongside quality …

• Distributed Coordination: Consensus, Heartbeats and Gossip

  … Now an old owner cannot damage state after a pause or network split. Use the smallest tool Need …

• Your Practical Kubernetes Workflow

  Use Helm to package YAML, GitOps to deploy from Git, and a small kubectl toolkit to operate an …

• GitOps, Progressive Delivery and Observability

  … team. - Use spot or preemptible nodes for fault-tolerant workloads, protected by PDBs and topology spread. - Tools such …

• Python Fundamentals

  … tools; learn them well and most programs become short. ![Python's core collections and when to use each …

• Terraform: Start Here

  … Use application delivery tools for frequent code releases and configuration management tools when you need extensive operating-system …

• Caching, Consistent Hashing and Sharding

  … Concepts and implementation details Three different tools ![A request can use cache for speed, consistent hashing for stable …

• CI/CD and Reviewed Production Changes

  … tooling to reviewed versions. The test command assumes a maintained test suite and safe test credentials. Tests using …

• Storage, Search and Location Queries

  … the search index or the metadata database? --- Concepts and implementation details Three questions, three tools Need Typical tool …

• Rust: Types, Errors and Concurrency

  … pattern tools if let Status::Shipped { tracking } = &order.status { notify(tracking); } let Some(user) = find user(id) else …

• Resilience Patterns

  … The patterns below stop that.  1. Timeouts: never wait forever …

• O — Open/Closed Principle

  … StudentDiscount : 🆕 added later OCP is everywhere you look Tool Extension point --- --- Express / Koa Middleware: app.use(myMiddleware) VS …

• AWS Data Pipelines in Plain Language

  … files in S3 organized so analytics tools can read them. Keep the areas separate Area What belongs there …

• Data in Microservices: Sagas & the Outbox Pattern

  … We need other tools. Why not a distributed transaction (2PC)? Two-phase commit asks every participant "can you …

• Small Functions That Do One Thing

  … In a professional kitchen, chefs use separate tools, and each one is excellent at a single job. ![One …

• Developer Learning Plan and Document-Assistant Capstone

  … The complete program below runs using Python's standard library. Save it as document search.py and run …

• REST vs GraphQL vs gRPC

  … Post! } js const resolvers = { Query: { user: ( , { id }) = usersRepo.findById(id) }, User: { posts: (user, { limit }) = postsRepo.byAuthor(user.id …

• Backend Languages: Node.js, Go, Python & Rust

  … the loop (use worker threads) Go Goroutines + channels, multi-core High-concurrency services, cloud tools (Docker and Kubernetes …

• Microkernel (Plugin) Architecture

  … When to use it ✅ Products that need customisation or third-party extensions (IDEs, CMSs, build tools), rules that …

• Internals, Upgrades, Resilience and Interview Questions

  … 3 tolerates 1 loss, 5 tolerates 2. - It is sensitive to disk latency ; use fast SSDs and keep …

• Multi-Account Strategy, Governance and Security Operations

  … Mature organizations use many accounts , not one big one. mermaid flowchart TD Root[Management account] -- Sec[Security OU …

• Configuration, Secrets and Storage

  … LOG LEVEL: "info" PAYMENTS URL: "http://payments-api" Use it as environment variables in a pod: yaml envFrom …

• Frontend Testing Strategy

  … and runs tests in parallel. Other useful test types Type Catches Tools --- --- --- Visual regression Unintended style changes Playwright …

• Prompting and Structured Outputs

  … or use retrieval. Do not ask it to “think harder” as a substitute for missing data, tool access …

• Neural Networks and Deep Learning

  … useful vectors. - Training behavior depends on data, objective, architecture, and optimization settings. - Deep learning is a tool choice …

• Cost Optimization and the Well-Architected Framework

  … up visibility first. Tool Purpose --- --- Cost Explorer Explore spend by service, account, tag and usage type Budgets Alerts …

• Testing, Preconditions, and Policy Checks

  … Implement policies with the chosen platform's supported policy engine or a tool that evaluates plan JSON. bash …

• Releases, Observability and Production Safety

  … add compatible fields, deploy compatible readers/writers, backfill, then remove old usage in a later release. 2. Build …

• Domain-Driven Design: Strategic Design

  DDD's big-picture tools. Domains and subdomains, ubiquitous language, bounded contexts, all the context-mapping patterns, and …

• What Are Design Patterns?

  … Meet the three families and learn how to use patterns without overusing them. The big idea Architects don …

• Troubleshooting Playbook

  … always means label mismatch or failing readiness. - Use kubectl debug instead of baking debugging tools into production images.

• Clean Architecture in Depth

  … Use cases (and their ports) 🟣 Frameworks & drivers Express, React, Postgres drivers, Stripe SDK You change a tool …

• Drift, Troubleshooting, and Disaster Recovery

  … A later ordinary plan may still propose undoing the console change. Replacement and targeting Use terraform plan -replace …

• Extending Kubernetes: CRDs, Operators and Admission

  … date-time } Then users create instances: yaml apiVersion: shop.example.com/v1 kind: Backup metadata: name: nightly-db …

• Observability and Incident Response

  … Trace failed requests and correlate with structured logs using request and business-intent IDs. Avoid high-cardinality IDs …

• What Is Artificial Intelligence? A Developer's Guide

  … It still needs ordinary software to authenticate users, read messages, display results, and collect corrections. Artificial intelligence (AI …