About

Sr. Product Designer, System Thinker & Vibe-coder

Based in Lahti, Finland · kart.ehastu (a)gmail.com · +358 452589845 ·

Based in Lahti, Finland · kart.ehastu (a)gmail.com · +358 452589845 ·

Based in Lahti, Finland

kart.ehastu(a)gmail.com

+358 452589845

I’m a product designer focused on complex B2B products where decisions depend on data, domain expertise, and trust.


At RELEX Solutions, I’m designing price optimization and AI capabilities for retail teams — helping turn pricing strategy, rules, and model outputs into workflows people can understand, evaluate, and act on.


My strength is building clarity in messy product spaces: learning the domain, mapping the system, shaping the interaction model, and helping cross-functional teams move with more confidence.

I’m a product designer focused on complex B2B products where decisions depend on data, domain expertise, and trust.


At RELEX Solutions, I’m designing price optimization and AI capabilities for retail teams — helping turn pricing strategy, rules, and model outputs into workflows people can understand, evaluate, and act on.


My strength is building clarity in messy product spaces: learning the domain, mapping the system, shaping the interaction model, and helping cross-functional teams move with more confidence.

What I work on

Decision support systems

Designing workflows where users need to compare options, understand trade-offs, and make many decisions quickly.

AI behaviour in products

Designing workflows where users need to compare options, understand trade-offs, and make many decisions quickly.

Data-heavy enterprise UX

Turning dense information, business logic, and edge cases into interfaces that remain usable at scale.