XPER DocEngine
DocEngine adds accessibility structure to existing PDFs and validates the result against PDF/UA. It also generates accessible PDF and HTML from templates and structured data.
Hi, I'm Tomas Hajek.
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I build systems that generate, transform, and validate customer documents. Most of my work is with OpenText Exstream, accessible PDF/UA output, and AI tools for document engineering.
Co-founder, managing consultant, and lead architect at Xper Consulting AS.
Projects
UA1.dev
A free PDF/UA-1 validator. Drop in a PDF for a quick check, or use the JSON API from CI, a script, or an AI agent.
Featured
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The token tax of Norwegian Bokmål in LLMs
Published:• 2 min readThe same government foreword used 37.4% to 67.5% more tokens in Norwegian Bokmål than in English, despite fewer characters.
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AI agents are useful for old software backlogs
Published:• 2 min readAgents can inspect stale bugs, duplicate issues, old PRs, and half-finished ideas without getting bored. The decision still needs evidence.
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Fixing OpenClaw with OpenClaw
Published:• 2 min readOpenClaw helped investigate and fix its own bug. The agent shortened the path to a reviewed patch, while humans kept control.
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What years of work with Gjensidige taught me about customer communication
Published:• 4 min readWhat long-term CCM work with Gjensidige taught me about technical memory, trust, accessibility, and controlled communication.
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The retrieval test passed. The refusal checker could not prove the assistant stopped
Published:• 6 min readA technical account of multilingual RAG evaluation, unsupported questions, and why a refusal phrase cannot prove the assistant stopped.
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My assistant answered a question without supporting evidence
Published:• 2 min readThree models found the expected documents. Unsupported questions exposed a separate requirement: stop when the knowledge base has no answer.
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Our shared agent workflow now includes review and repair
Published:• 2 min readOur OpenHands-based cloud environment centralizes agent configuration and repeats review and fixes before human approval.
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Why I think AI will replace most SaaS products
Published:• 2 min readI built a food tracker with AI to fit my own needs. I think SaaS products will need to solve harder problems as more people can build their own alternatives.
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DocEngine now drafts accessibility templates with AI
Published:• 2 min readUpload a sample PDF, get a drafted accessibility template. Available today in DocEngine, with two non-negotiables built in.
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The model names things, the code keeps the coordinates
Published:• 4 min readWe tried drafting accessibility templates without an LLM first. What shipped gives the model meaning but never a coordinate.
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The config line that outlived its model
Published:• 2 min readI burned 39% of a weekly Codex quota in four and a half hours. A context-window override I set during GPT-5.5 was still in my config.
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What a 14-hour Codex run taught me about task queues
Published:• 4 min readAfter a 14-hour Codex run, I want long agent tasks controlled by a queue with a clear finish line and reviewable evidence.
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The review bottleneck is the new software bottleneck
Published:• 7 min readAI agents increase code output faster than teams increase review capacity. Senior attention moves to understanding, verification, and ownership.
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Claude Fable 5 refused my defensive security review
Published:• 3 min readClaude Fable 5 refused a defensive review of our own SaaS application twice, including a prompt that explicitly banned exploit guidance.