Strategy work
for the board cycle.

Black Rock Capital is led by Kostantin Stambolov — a product strategy leader with over a decade operating inside growth-stage SaaS and mobile companies across Europe. The primary engagement is a Board-Ready Strategy Reset: a time-bound intervention for CEOs who need to reduce initiative overload, reconnect product direction to revenue, and walk into the next board meeting with a clearer strategic narrative.

That observation is the foundation of Black Rock Capital. Not a methodology borrowed from a framework. A pattern seen repeatedly, from the inside, across companies at different stages and in different markets.

Kostantin has led product teams ranging from 6 to 50 people at Experian (global enterprise, 7 regions, $5M portfolio migrations), MobiSystems (P&L ownership across 5 consumer products, $1.5M ad spend, direct partnerships with Apple and Google), Juicer (B2B SaaS, direct revenue involvement — demos, contract negotiation, unblocking stalled enterprise deals), and Trading 212 (early-growth fintech, now €30B+ in client assets).

The through-line across all of it: every company that hit a ceiling hit it at the same place. Not at execution. At the point where strategy stopped being explicit, the initiative list kept growing, and everyone started filling the gap with their own version.

Black Rock Capital exists to fix that before the next board cycle — in a defined time window, with a clean exit, and no dependency created.