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aplgr/README.md

André Plöger

Software Engineer focused on PostgreSQL performance, legacy modernization, and predictable backend systems.

I work on existing software where performance, maintainability, and operational reliability matter more than hype.

My focus is on PostgreSQL performance in real production environments: expensive queries, inefficient access patterns, missing or suboptimal indexes, connection handling, schema evolution, and database behavior that no longer keeps up cleanly with product growth.

That work often overlaps with the same kind of engineering challenges I have worked on for years: improving grown systems step by step, reducing risk in migrations and upgrades, and making complex application landscapes more stable and more predictable.

Current focus

  • PostgreSQL performance analysis
  • Query optimization and execution plan review
  • Index strategy and schema evolution
  • Connection pooling and database-facing bottlenecks
  • Production troubleshooting and performance stabilization
  • Pragmatic modernization in existing systems

Broader background

My background is rooted in legacy systems, backend engineering, integrations, and incremental modernization.

That includes work on:

  • Perl and Go backend systems
  • data-intensive applications
  • migration and refactoring work
  • internal tools and automation
  • architecture improvements under real production constraints

Selected repositories

andreploeger.com

Source for my website. Reflects my current direction around PostgreSQL performance, query analysis, and predictable systems.

html2pdf-service

A Go-based microservice for HTML-to-PDF conversion via HTTP API.

formmailer

A small form mailer with practical safeguards such as rate limiting, honeypot protection, and controlled SMTP delivery.

fastnotepad-to-obsidian

Migration tool for converting FastNotepad exports into clean Obsidian-ready Markdown.

zim-to-obsidian

Conversion tool for moving Zim Wiki notebooks to Obsidian while preserving structure and links.

How I work

  • Small, verifiable steps
  • Clear technical reasoning
  • Pragmatic solutions over unnecessary complexity
  • Improvements that hold up in production

Contact

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  1. andreploeger.com andreploeger.com Public

    Source for andreploeger.com — freelance website focused on PostgreSQL performance, query analysis, and predictable system behavior.

    HTML 1 2

  2. html2pdf-service html2pdf-service Public

    A Go-based microservice for converting HTML to PDF via HTTP API. Supports CSS, images, and Unicode.

    Go 1 2

  3. fastnotepad-to-obsidian fastnotepad-to-obsidian Public

    Convert FastNotepad exports into Obsidian-ready Markdown files (export parsing, frontmatter, tags, categories, dry-run)

    Python

  4. formmailer formmailer Public

    Tiny CGI form mailer: accept JSON form posts and deliver via SMTP. CORS allow-list, honeypot, min fill time, IP rate limit.

    Python 1

  5. zim-to-obsidian zim-to-obsidian Public

    Convert Zim Wiki notebooks to Obsidian-ready Markdown (with optional YAML frontmatter) while preserving attachments and internal links

    Python

  6. grovegrid grovegrid Public

    Interactive growth maps for rows of trees. CSV in; single HTML out.

    HTML 1