Senior product & UX designer · Finland

Make complex work feel clear.

I design digital products where dense information, demanding workflows and real human needs meet. I bring 17+ years across UX, visual design and design leadership to the work from discovery through delivery.

Portrait of Juha Tretjakov
Juha Tretjakov · Tampere, Finland
What I bring to product teamsHands-on interface craft, research, reusable systems and an AI-driven mindset, with a close working rhythm across product and engineering.
01 / Selected work

Real product work, from early sketches to dense data interfaces.

Three projects showing how I approach responsive service design, cross-device workflows and information-rich tools.

View full portfolio (PDF) ↗

Desktop wireframe of the Smart Energiapalvelut websiteMobile wireframe of the Smart Energiapalvelut website
01 — SMART ENERGIAPALVELUT

Energy services website

Desktop and mobile wireframes organising a broad energy and ICT service offering by service type and customer group, with clear routes to explore services and make contact.

Information architecture · Responsive wireframes · Service presentation
Mobile workspace booking flows and desktop availability interface for Worksense
02 — WORKSENSE

Workspace and meeting room booking

Redesigned an existing booking application for mobile and desktop, improving usability and visual clarity with accessibility in mind. Iterative prototypes were developed with the customer.

Cross-device UX · Iteration · UI system
Charts and comparative sales data in the pharmacy sales application
03 — PHARMACY SALES APPLICATION

Make sales data usable

Worked on bringing information from multiple systems into one application, with graphs, comparison tables, a nationwide map view and pharmacy visit notes.

Data-rich UI · Dashboards · Workflow design

The PDF contains additional screens and context for each project. It does not include measured product outcomes, so none are claimed here.

02 / Working method

Fast iteration needs clear judgment.

Understand

Talk to users and stakeholders; identify the decisions and friction that matter.

Frame

Model the workflow, constraints and success criteria before polishing screens.

Make

Explore flows and prototypes in Figma and align patterns across the product.

Learn

Test assumptions, work with engineers and refine what ships.

I use ChatGPT, Claude and Figma AI tools to organise research, explore alternative flows and accelerate early prototyping. I check AI output against user evidence, accessibility and product constraints.

03 / About

Design range with product focus.

I started in graphic design and moved into UX, service design and leadership roles. I have worked in startup and international-company settings, as well as on freelance design projects. That range helps me move between product structure, visual detail and the conversations needed to get useful work shipped.

Practice: UX/UI, research and usability testing, service design, accessibility, design systems, visual identity and facilitation.

Tools: Figma and Figma AI tools, Miro, ChatGPT, Claude, Adobe Creative Cloud, WordPress, HTML and CSS fundamentals.

Based in: Tampere, Finland.