About PDF Taituri

PDF Taituri is a Finnish PDF toolkit for accounting firms, law firms, housing companies and SMEs. Its AI runs entirely on the user's own machine, and files never leave the device. Updated 7 October 2026.

Built by John Tammi

John Tammi is a Finnish AI and cybersecurity expert who builds AI for demanding, regulated environments such as law and security- and privacy-critical business. He joins companies as an equity partner. Among others, he is Co-founder, Partner & CTO at Koukku.ai and Partner & Head of Business at Y-lehti.

At Koukku.ai, John has built PDF Taituri, among other products. He also built the AI functionality for legal work at Lex Kapital, a law and accounting firm in Turku, and has delivered confidential AI and data projects for the public sector in Finland and abroad.

Previously, John worked at Microsoft as a software engineer, where he helped bring Xbox Live to Finland. He holds a BSc in Data Science from the London School of Economics and Political Science (2019).

• johntammi.fi
• Koukku.ai team
• X: @JohnTammiKoukku

Security and privacy questions: john@koukku.ai.

Company

PDF Taituri is published by Koukku.ai (Koukku Kapital Oy, business ID 3331246-5, Turku, Finland). Sales and licences: myynti@koukku.ai.