IDEAS, DECISIONS & LESSONS

Journal

Notes on AI, architecture and building useful products.

904 articles

23 Feb 2026 · 7 min read

angular

Testing Angular 21 + .NET 10 Ecommerce: Vitest, xUnit, and Playwright E2E

Part 9 of 11 — A practical testing strategy for an Angular 21 + .NET 10 ecommerce project. Unit testing with Vitest and Angular Testing Library, .NET integration tests with xUnit, and Playwright E2E for the critical purchase flow.

22 Feb 2026 · 5 min read

adr

The AI Solution Architect: System Design, ADRs & Technology Selection in the AI Era (Part 4 of 12)

Part 4 of 12 — How AI transforms the Solution Architect role: AI-assisted architecture diagramming, ADR generation, trade-off analysis, technology selection rationale, and the architectural taste that only experience provides.

22 Feb 2026 · 13 min read

The Patterns That Actually Make Claude Code 10x: Subagents, Parallel Sessions, and 6 Months of Lessons

Part 5 of 5 — Plan-before-code workflow, subagents for parallel tasks, context management strategies, debugging with Claude, the anti-patterns that waste time, and honest lessons from 6 months of daily production use.

22 Feb 2026 · 25 min read

architecture

Testing Clean Architecture: From Unit Tests to Architecture Enforcement

Part 6 of 7 — Testing strategy per layer for Kids Learn. Domain unit tests without mocks, Application tests with NSubstitute, integration tests with Testcontainers, and NetArchTest for enforcing the Dependency Rule.

22 Feb 2026 · 37 min read

accessibility

Building KidSpark: UX/UI Design for Children — Age-Appropriate Interfaces That Actually Work (Part 3 of 10)

Part 3 of 10 — Children are not small adults. Designing for a 4-year-old and a 12-year-old requires fundamentally different thinking about touch, color, navigation, and cognitive load.

22 Feb 2026 · 22 min read

The Voice AI Interview Playbook: Building the Voice Pipeline — STT, LLM, and TTS That Actually Work (Part 4 of 12)

Part 4 of 12 — Deepgram Nova-3 or Whisper for STT? Gemini Flash or GPT-4o for conversation? ElevenLabs or Cartesia for TTS? Real benchmarks, real costs, and the combinations that actually work in production.

21 Feb 2026 · 12 min read

Custom Skills and GitHub Workflows: Making Claude Code Do Exactly What Your Team Needs

Part 4 of 5 — Writing custom skills with SKILL.md, slash commands, the official and community skill repos, GitHub PR automation with @claude mentions, GitHub Actions integration, and team workflow patterns.

21 Feb 2026 · 23 min read

architecture

Vertical Slices Inside Clean Architecture: The Best of Both Worlds

Part 5 of 7 — Why pure Clean Architecture scatters features across projects, how Vertical Slice Architecture solves this, and the hybrid approach we use in Kids Learn.

21 Feb 2026 · 18 min read

livekit

The Voice AI Interview Playbook: LiveKit vs. Pipecat vs. Direct — Picking Your Framework (Part 3 of 12)

Part 3 of 12 — LiveKit gives you WebRTC infrastructure. Pipecat gives you pipeline flexibility. Direct integration gives you simplicity. Here's how to choose for your voice interview platform.