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Jaka Fefer

Jaka Fefer

Open to workLjubljana, Slovenija, CET (UTC+1)

Founding Product Designer for early-stage fintech and AI products.

I design it, ship it as production code, and iterate on real usage.

Recent teams and products

  • Bonfires
  • EasyX
  • Bluerock
  • Otaris
  • DeSciWorld
  • MightyWorks
  • Faculty Group

Measured results from shipped work

onboarding completionEasyX
40%
faster handoffDeSciWorld
30%
lower operating costsDeSciWorld
27%
outsourced dev cost cutFaculty Group
50%

Selected work

Each study starts with the result and the real screens. The decisions behind them come after.

How I work

One person from the first sketch to the shipped screen, so less gets lost between design and build.

  1. Step 1

    Design with the people who use it

    Interviews, flows and prototypes in Figma, tested with real users before anything is built. On EasyX that meant 50+ participants before launch.

  2. Step 2

    Ship it as production code

    I build the product UI, landing pages and design system components myself with Claude Code and Cursor, so what ships matches what was designed.

  3. Step 3

    Measure and iterate

    Usage data in PostHog shows what people actually do with it, and the next iteration starts from that.

Both versions of this portfolio were built this way, from a written plan, one pull request at a time. How the Figma-style version is built

Experience

Fintech, DeFi and early-stage products, mostly as the first designer on the team.

Download the full CV (PDF)
  1. DeSciWorld

    Nov 2024 - Aug 2025

    Product Designer & Manager, remote

    • Owned product design and UX for a research and collaboration platform, contributing directly to product direction and roadmap decisions.
    • Designed and maintained a design system in Figma using variable tokens for typography, color, spacing, and theming, supporting long-term consistency and faster development.
    Show 5 more
    • Built responsive UI frameworks using auto-layout, component logic, and prototyping techniques, reducing design-to-development handoff time by 30%+.
    • Created production-aligned, testable prototypes that accelerated iteration cycles and improved alignment between design and engineering.
    • Worked closely with engineers throughout implementation, resolving layout and UI issues directly and improving accuracy between design intent and shipped product.
    • Led UX reviews and flow optimizations, improving usability and consistency across core user flows.
    • Partnered with the founder on product and operational cost decisions, identifying inefficiencies that reduced monthly operating costs by ~27% and extended the company's runway.
  2. MightyWorks

    Nov 2024 - Dec 2025

    Co-Founder, Product Designer, remote

    • Co-founded a product and design studio delivering branding, UX, and product design for 20+ client projects across fintech, infrastructure, and data-heavy products.
    • Led discovery workshops and design sprints, translating ambiguous client needs into clear product direction, priorities, and roadmaps.
    Show 4 more
    • Designed multiple zero-to-one products, creating modular design systems and responsive UI patterns optimized for efficient development.
    • Managed up to five parallel client engagements, coordinating scope, timelines, and client communication.
    • Conducted usability interviews and post-launch iteration cycles to validate assumptions and continuously improve shipped products.
    • Balanced client expectations, scope, and delivery timelines across multiple concurrent engagements, ensuring sustainable execution in a services-based business.
  3. EasyX

    Jan 2022 - May 2024

    Product Designer, remote

    • Designed UX for an early-stage, high-risk trading platform where users made irreversible financial decisions, requiring strong confirmation, error prevention, and trust signals.
    • Led the design of structured onboarding and critical decision flows, improving onboarding completion by ~40% while reducing user errors through clear risk communication and confirmation patterns.
    Show 3 more
    • Built and tested interactive prototypes with 50+ participants, translating usability findings into concrete improvements before launch.
    • Collaborated with product leadership on feature tradeoffs, scope reduction, and prioritization based on user needs, competitive analysis, and engineering constraints.
    • Was the final design gate for high-risk user flows, blocking unsafe or unclear interactions from shipping and enforcing simplified, lower-risk solutions under time and delivery constraints.
  4. Otaris

    Jan 2021 - Nov 2022

    Product Designer, Scrum Master, remote

    • Joined the founding team as its first product designer, defining core UX flows and UI systems from the ground up.
    • Took on the Scrum Master role, coordinating sprint planning, backlog grooming, and team rituals across design and engineering.
    Show 1 more
    • Led a product and engineering team to deliver a polished, production-ready product under startup constraints.
  5. Faculty Group

    Jan 2019 - Oct 2022

    Product Designer, Project Manager, remote

    • Designed UX and UI for multiple digital products, turning user feedback into actionable design iterations.
    • Managed design and delivery across four concurrent projects, maintaining consistency and execution quality.
    Show 1 more
    • Identified inefficiencies in an outsourced development engagement, resulting in a 50% cost reduction over six months.

Earlier and shorter roles

  • Social Kung Fu, Product DesignerMay 2023 - Dec 2023
  • X8C Marketing Agency, Graphic DesignerJul 2019 - Nov 2021

Skills and education

Design

  • Product Design (UI/UX)
  • UX Research
  • User Journey Mapping
  • Interaction Design
  • Design Systems
  • Prototyping & Validation
  • Risk-aware UX & Trust Design
  • Data-dense Interface Design

Product and delivery

  • SCRUM
  • Project Management
  • Product Discovery & Prioritization

Technical

  • AI-assisted prototyping
  • Code-adjacent design workflows
  • Design-Engineering Collaboration
  • Design-adjacent frontend implementation

Education

  • Graphic and Media Technology

    Faculty of Natural Sciences and Engineering

    2016 - 2019

  • UX Design Professional

    Google

    Jul 2021 - Dec 2022

  • Responsive Web Design Developer

    freeCodeCamp

    Mar 2020

Tools

  • FigmaUI Design, prototyping
  • Adobe Creative SuiteDesign
  • CursorPrototyping
  • ClickUpProject Management

Languages

  • SlovenianNative
  • EnglishProfessional working
  • SpanishElementary

About

Founding Product Designer, 7+ years in fintech, DeFi and early-stage products where users make irreversible decisions. I build what I design. Product UI, landing pages and design systems shipped as production code with Claude Code and Cursor, tested against real usage in PostHog.

I've been the first designer at several companies, owned the design system, the onboarding and the risk flows, and sat with founders on scope and cost decisions.

Outside work I play drums, ride downhill mountain bike trails, practise card magic and make Neapolitan pizza for friends.

Hiring a product designer?

I am open to work, based in Ljubljana and used to working remotely across time zones. Email is the fastest way to reach me.

fefer.jaka@gmail.com