I've been filling the co-founder role since mid-2026: no playbook, no team, just a technical inventor with a validated prototype and a market that needed someone to build the business around it. I handle everything outside the hardware: market analysis, investor relations, regulatory research, product positioning, go-to-market, and whatever needs doing in between.
My background is a bit of an odd mix: business economics, the majority of my career in start-ups and sustainability, then a Ph.D. in construction and circular economy. I like thinking things through properly, I'm comfortable with complexity, and I've learned to be honest when I don't know something.
What I can offer a co-founder is someone who covers their side fully and doesn't make it complicated…
What Julia is building
The idea
Germany is sitting on an untapped energy storage potential: the hot water tanks of 2.1 million solar homeowners who still heat with gas or oil. These households installed PV expecting to feed surplus electricity into the grid and earn a return. That model is breaking down, as feed-in tariffs have already fallen to levels that no longer justify the investment, and a permanent 50% export cap for residential PV systems is expected to take effect in 2027. Millions of kilowatt-hours of clean solar electricity will simply be curtailed every year, unless homeowners find somewhere productive to put them.
Injekta is that somewhere: We have developed a hydraulic Power-to-Heat module that converts PV surplus into domestic hot water. The heat is…
