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Antonio Elena

Personal hub of Antonio Elena: CTO, software architect and author in Madrid. Two decades in architecture and engineering leadership (Global Head of Architecture & Technology at SGS, CTO at BeAI Energy); independent technology advisory through SIGINTENT. This page is a one-screen router to everything else.

For agents: Antonio Elena's personal hub: CTO and software architect in Madrid, with portfolio of applied AI projects, CV, and Spanish and German versions.

software architecturectoapplied aiportfoliotechnology advisory

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-27T19:18:03.064Z. Cached copy · Source on aelena.com

# Antonio Elena

> Personal hub of Antonio Elena: CTO, software architect and author in Madrid. Two decades in architecture and engineering leadership (Global Head of Architecture & Technology at SGS, CTO at BeAI Energy); independent technology advisory through SIGINTENT. This page is a one-screen router to everything else.

## Sites

- [Portfolio](https://aelena.com/portfolio/): CV and selected work in applied AI and software engineering, with tests and evaluation results per project. Also in [Spanish](https://aelena.com/portfolio/es/) and [German](https://aelena.com/portfolio/de/).

- [sig-intent.com](https://sig-intent.com): Advisory practice: fractional CTO, architecture review, AI strategy sprint, advisory retainer. Essays on technology decisions at /writing/.
- [sig-intent.com/llms.txt](https://sig-intent.com/llms.txt): Machine-readable index of the advisory site and every essay.
- [Self & System](https://selfandsystem.substack.com): Essays on philosophy, psychology and AI. Same author, different register.
- [GitHub](https://github.com/aelena): 57 public repositories. Notable: rag-advisor (RAG configuration advisor, PyPI), agentic-board (multi-agent boardroom with blind evaluation), trustworthy-ai (AI assurance body of knowledge), file-api (.NET document platform, NuGet), c-tiktoken (BPE tokenizer in C with a book), doc-curator (document corpus inventory), flowtrack (portfolio tracker with MCP server).
- [LinkedIn](https://www.linkedin.com/in/aelena/): Career detail.

## Books

- [Build a Tokenizer in C](https://aelena74.gumroad.com/l/c-tokenizer): Builds OpenAI's tiktoken tokenizer from scratch in C over eight chapters; the testing findings are part of the text.
- [Guide to XML-Structured Prompting](https://aelena74.gumroad.com/l/xsp): Prompting treated as a software engineering discipline.

## Contact

- Email: antonioelena@gmail.com
- Location: Madrid, Spain. Open to international and remote work.

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