Daniel Milewski
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© 2026 Daniel Milewski

Sole proprietorship (CEIDG, Poland) · NIP 8442338935

Writing

Notes on Python, systems, and the occasional lesson learned the hard way.

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  • Oct 2026

    Your JSON-LD Might Not Be in Your HTML: A Next.js App Router Trap

    I found my own portfolio shipping structured data that crawlers without JavaScript could not see. One component change fixed it. Here is how to check yours.

    Next.js · SEO · Structured Data · TypeScript

    3 min read
  • Aug 2026

    Technical SEO for Astro Sites: What Moved the Needle for Two Interior Design Studios

    Two photo-heavy local business sites, one stack. What mattered for indexing, AI visibility and mobile speed, and what turned out to be noise.

    Astro · SEO · Web Performance · Structured Data

    4 min read
  • Nov 2025

    FIFO Cost Basis in Python: What I Learned Building InvestTracker

    Calculating realized P&L sounds like a one-liner until you add partial sells, multiple currencies and broker imports. Here is the model that held up.

    Python · Fintech · PostgreSQL · Backend

    4 min read
  • Nov 2024

    Practical Lessons from Building LLM Apps in Production

    LLM demos are easy. Production LLM apps are not. Here's what I've learned shipping several of them — the problems nobody talks about in tutorials.

    Python · LLMs · Production · AI Engineering

    3 min read
  • Oct 2024

    FastAPI Patterns I Actually Use in Real Projects

    Not the patterns from the docs — the ones that have actually held up in production, across multiple projects with real teams maintaining them.

    Python · FastAPI · Backend · Architecture

    3 min read
  • Sept 2024

    What Makes Automation Projects Actually Valuable for Businesses

    Most automation projects fail not because of technical problems, but because they solve the wrong thing. Here's how to identify what's actually worth automating.

    Python · Automation · Product Thinking · Engineering

    3 min read