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Umitomo
Umitomo

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Weekly Dev Log 2026-W10

πŸ—“οΈ This Week

  • While organizing ideas for my first iOS app, I remembered an old web app idea called ToneDrill, which I had casually built before to help practice note names on a guitar fretboard🎸. I decided to try turning it into an iOS appπŸ› οΈ.
  • I clarified the purpose of ToneDrill, its minimum requirements, and its core features, then organized them in NotionπŸ“.
  • I was curious to see how well Codex could implement an iOS app from those minimum requirements, so I gave it a try right awayπŸ’‘.
  • I reviewed the SwiftUI code generated by Codex and worked through the app logic to understand how it was implementedπŸ”. For now, I was able to create a working app, which felt like a meaningful step forward🚢.
  • I created the top page UI design for my portfolio website in Figma🎨. I focused on keeping the structure simple and implementation-friendly, and designed the UI with reusable components for each major part.
  • Based on what I learned from my previous failed attempt, I tried again to see how well Codex could implement a prototype from the Figma UI design (You can read about my previous attempt that didn’t go so well hereπŸ˜….)
  • Worked on the AI Threat Modelling room from the AI Security Learning Path on TryHackMe this weekπŸ€–.

πŸ“± iOS (SwiftUI)

  • Revisited an old web app idea called ToneDrill, which I had previously built casually as a guitar note-training app, and considered turning it into an iOS app.
  • Organized the app idea in Notion, including its purpose, target use case, minimum requirements, and core features.
  • Decided to aim for an MVP-level version first, instead of trying to build a fully featured app from the beginning.
  • Wrote down simple requirements and tested how accurately Codex could implement the initial version of the app.
  • Reviewed the iOS app implementation generated by Codex and examined the code in detail to understand how the logic worked.

🌐 Web Development

  • Posted my weekly dev log on Dev.toπŸ“
  • Completed the top page UI design for my portfolio website in Figma.
  • Tried using Codex again to generate a prototype app based on the Figma UI design.

πŸ” Security (TryHackMe)

  • Worked on the AI Threat Modelling room (part of the AI Security Learning Path) on TryHackMe.

πŸ’‘ Key Takeaways

πŸ“± SwiftUI Learning

πŸ¦„ What I learned by starting with a small app and minimum features

  • I started building the app with the mindset of creating small, steady progress instead of trying to build a large app right away.
  • Starting small made it much easier to take the first step mentally and actually begin building the app.
  • Even though the app is small, I realized that the knowledge I gained from tutorials alone was not enough to fully understand the implementation details.
  • I had to review and research the code step by step to understand how each part worked.
  • This made me realize that if I started with a much larger app, it would take a lot more time to understand the implementation while building it.
  • I also learned that I should define more clearly when and how I use Codex during development.
  • For now, my plan is to keep using AI actively until I can complete one working app, then evaluate where AI is most helpful and where I need to review the code more carefully myself.

🌐 Web Development Learning

❀️‍πŸ”₯ What I learned from retrying prototype generation with Figma MCP and Codex

  • Learned that I should first ask Codex to review the design system in the Figma UI design, then have it create rule files such as app.css and FIGMA_DESIGN_SYSTEM.md based on those design rules.
  • Learned that designing a Figma UI with implementation in mind is important when asking Codex to generate a prototype.
  • Instead of only creating a visual mockup, I structured the UI with clear frames, reusable components, and layout rules.
  • I also documented the design system in rule files so Codex could better understand the intended structure, spacing, colors, and component styles.
  • As a result, Codex was able to generate a prototype that closely matched the Figma designπŸ”₯.

πŸ” TryHackMe Learning

AI Threat Modelling

Task 6: OWASP LLM Top 10 β€” Mapping Risks to Components

  • I learned that the OWASP LLM Top 10 helps map LLM-specific risks to the components where they occur.
  • OWASP LLM Top 10 is useful not only as a checklist, but also as an assessment tool for reviewing LLM architecture.
  • I learned that the LLM inference endpoint has the highest risk concentration, including prompt injection, sensitive information disclosure, excessive agency, system prompt leakage, misinformation, and unbounded consumption.
  • Vector databases and RAG pipelines require special attention because they can introduce indirect prompt injection, embedding weaknesses, and misinformation from stale or incorrect sources.

πŸš€ Next Week

  • Review the issues and improvements needed in the minimum-feature app generated by Codex, then start making code changes.
  • Ask Codex to help explore UI design ideas for the ToneDrill app and decide on the overall UI direction.
  • Review and understand the implementation details of the portfolio website prototype generated by Codex.
  • Continue posting small articles on Dev.to.
  • Continue working on the AI Security Learning Path.

🌈 Goals for This Year

πŸ“± iOS (SwiftUI)

  • Build a solid foundation in SwiftUI and create at least one iOS app.

🌐 Web Development

  • Continue posting learning logs on Dev.to and eventually turn them into a portfolio site using React Router v7.

πŸ” Security (TryHackMe)

  • Continue learning cybersecurity on TryHackMe.

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