Jascha Achterberg

Jascha Achterberg co-founded Callosum alongside Danyal Akarca, both Cambridge PhD graduates. Callosum received a direct equity investment from the UK Sovereign AI Fund on 16 April 2026, the only equity stake in the programme's first tranche, alongside compute access grants for six other companies . The company's focus is software enabling diverse chip architectures to interoperate — a foundational problem for European sovereign AI infrastructure that operates mixed hardware fleets.

As with co-founder Danyal Akarca, Achterberg has no substantial independent public profile in trade or tech media as of April 2026. Both founders are identified primarily through the DSIT announcement and their Cambridge PhD credentials.

Callosum's equity backing positions Achterberg and Akarca as the infrastructure tier of the UK sovereign AI portfolio: if the six compute-access companies build applications, Callosum builds the plumbing that lets those applications run on non-US silicon at scale .