Financial analysis of Czech companies from public financial statements and other public sources.
Jan Faller
Web applications, data, and practical AI.
I design and build applications that connect the web, data, and automation. Here you will find my projects, technical notes, and experience.
Selected work
A website that helps find the European resorts with the best chance of fresh powder.
A public MCP server that connects AI agents to Czech company registries and filed financial statements — with no extra key to a model API.
Blog
A production case study: an email agent, several RAG collections, FAPI, Stripe, MioWeb and MCP servers over a single continuously updated data layer.
What I learned building an email agent about model tiering, RAG, prompt caching, evaluations, and the features I ended up switching off.
Next.js, Clerk, Stripe, and a custom player — plus a content-protection trade-off I made deliberately.