Jax0n's Portfolio
Jaka Fefer
Senior Product Designer
Designing complex, data-heavy products in fintech, infrastructure, and early-stage tech.
About me
Senior Product Designer with 6+ years of experience designing complex, data-heavy products in fintech, infrastructure, and early-stage tech environments. I specialize in high-risk user flows where clarity, error prevention, and trust are critical, including products involving irreversible or financially sensitive actions.
I've led end-to-end product design from concept to launch, built scalable design systems, significantly improved onboarding and early user activation, and influenced product and operational decisions that reduced costs and extended runway. I work closely with engineering and product leadership, often acting as the design authority on usability, risk, and scope tradeoffs.
With a background in computer engineering and frontend development, I design with implementation in mind, understand technical constraints, and collaborate effectively with engineers to ship high-quality products under real business and delivery constraints.
Selected Experience
- Owned the design of critical decision and confirmation flows for irreversible financial actions, reducing user error and increasing confidence in high-risk transactions.
- Improved onboarding completion by ~40% on an early-stage trading platform through structured education and sandbox flows.
- Reduced product and operational costs by ~27% through design-system efficiency and direct collaboration with founders on financial and scope decisions.
- Identified and corrected outsourced development inefficiencies, resulting in a 50% cost reduction over six months.
Design Philosophy
“I believe great product design is invisible. Users should feel confident, not confused. I focus on reducing cognitive load, making consequences explicit, and building trust through transparency. Every design decision should be traceable to a user need or business goal.”
Featured Work
Transforming group conversations into AI-accessible knowledge graphs for communities.
Improving onboarding and trading confidence in a high-risk financial environment.
Making crypto index investing and yield mechanics understandable without turning the interface into a trading terminal.
A Web3 investment platform connecting investors with curated dealflow through tiered NFTs and a built-in liquidity marketplace.
What I Focus On
- Turning complex systems into clear, structured user experiences
- Designing high-risk decision flows where clarity and trust are essential
- Running structured discovery, testing, and iteration cycles to move from assumptions to validated solutions
- Shipping testable prototypes to validate interaction logic before engineering implementation
- Designing with implementation in mind, reducing ambiguity and rework through close collaboration with developers
- Setting product priorities alongside founders and engineers to keep teams focused on high-impact outcomes
- Building scalable design systems that increase team velocity