PRODUCT BUILDERJakub KulhanJK
SKILLS LIBRARY

Assess your skills

Rate yourself on each skill across the product development journey. See where you’re strong, where you’re growing, and what a product builder needs to master. Filter by role to focus on what matters to you.

Skills self-assessment
SOLUTION DISCOVERY

Designing the right solution

From rough concepts to validated, buildable specifications.

Sketching

Sketching

Exploring solution ideas through fast, rough drawings before committing to any direction. Sketching externalises thinking – making abstract ideas tangible enough to critique, compare, and discard – without the investment of a real prototype. The goal is volume and speed, not visual quality.

PMDesigner
Content design

Content design

Designing how information is organized and presented – so that both humans and machines understand what your product does and why it matters. Bridges UX writing, information architecture, and modern SEO/AI discoverability.

Designer
Visual design

Visual design

Creating interfaces that are clear, beautiful, and consistent – from individual visual decisions to a shared design language across the whole product. A Product Builder both creates and uses the design system, so design and system thinking belong together.

Designer
Prototyping

Prototyping

Building something tangible fast – enough to test assumptions with real users before committing to full development. Modern prototyping increasingly means working in code, not just design tools.

PMDesignerEngineer
Usability testing

Usability testing

Validating that your solution actually works for real users – finding where they struggle, what they misunderstand, and what delights them before shipping.

Designer
System architecture

System architecture

Designing how the technical system is structured – what runs where, how components communicate, and how to choose the right infrastructure for the job.

Engineer
Database design

Database design

Designing how data is structured, stored, and accessed – the foundation of every data-driven product.

Engineer
API design

API design

Designing how systems communicate – both internal service APIs and external-facing APIs that others build on.

Engineer
PHASE SUMMARY
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Rate your skills to reveal your strengths in solution discovery

DELIVERY

Building, shipping, and measuring

From validated solution to production product – and learning what works.

Backend development

Backend development

Building the server-side logic, data processing, and integrations that power the product. Covers the patterns and principles that make backend code maintainable, not just working.

Engineer
Web development

Web development

Building what users see and interact with – using the core web platform, not framework abstractions. A Product Builder who understands the fundamentals can ship UI independently, with AI handling the boilerplate.

Engineer
App development

App development

Building desktop and mobile applications – either with native technologies (Swift for macOS/iOS, Kotlin for Android) or with web-based cross-platform frameworks (Tauri) that package web frontends as native apps. Choosing the right approach based on performance needs, platform integration depth, and team capabilities.

Engineer
Test-driven development

Test-driven development

Building software that works reliably and stays maintainable over time. TDD as a design tool, not just a testing afterthought – combined with the automation pipeline that enforces quality continuously.

Engineer
Observability

Observability

Knowing what’s happening in your product – from user behavior to server performance. Combining product analytics and technical monitoring into a unified understanding of product health.

PMDesignerEngineer
A/B testing

A/B testing

Making decisions based on evidence, not gut feel. Designing experiments that produce statistically reliable answers – and building the infrastructure to run them.

PMEngineer
Go-to-market

Go-to-market

Getting your product in front of the right people with the right message – and making sure everyone who needs to sell, support, or use it understands what it does and why it matters.

PMDesigner
PHASE SUMMARY
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Rate your skills to reveal your strengths in delivery

HORIZONTAL SKILLS

Skills that span the journey

Cross-cutting capabilities you use continuously across every phase.

PHASE SUMMARY
—Modus
—Median

Rate your skills to reveal your strengths in horizontal skills

YOUR SKILLS PROFILE

Overall evaluation

A comprehensive view of your product builder skills across all journey phases – from problem discovery to delivery and beyond.

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Your strengths will appear here

Rate your skills across all phases to see a personalized summary of your product builder profile