Aga Mastek

UX Professional

Product Designer

Design System Builder

Digital Creator

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Welcome

With almost a decade of experience in the industry, I’ve had a pleasure to work with global tech giant and a startup, covering end-to-end product design for all devices, accessible user experiences, design systems, brand definition, and visual design. During my career, I’ve had opportunities to experience it all: working solo, in small & large teams, collaborating with multiple teams, stakeholders & designers to reach alignment on design decisions. I’ve worked from home, in a busy & a quiet office, travelled for work a lot too. I bring “can do” attitude, plenty ideas & positive vibes to a workplace. Main areas of my expertise cover:

Design systems & scalability

Complex & data heavy systems

User centric & accessible

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Experience

UX Design Contractor

ThinkCyber

June 2025 - September 2025

  • Ran a full heuristic evaluation of the platform to highlight usability issues and gaps, giving leadership a clear picture of how the product was underperforming.
  • Designed new user flows and improved information architecture, turning overly complex experiences into intuitive, streamlined ones.
  • Produced a UI components and patterns recommendations deck, creating clarity for engineers and PMs while laying the groundwork for a scalable design system.
  • Partnered with engineering and product teams to refine features, improving user satisfaction and reducing reliance on Customer Support for basic usability issues.

Impact: Helped the client understand critical UX gaps, improved customer workflows, and provided a foundation for more efficient development velocity with reusable components and clear design guidance.

Product Designer

Continuum Industries

July 2024 - April 2025

  • Designed and improved workflows for a complex AI-driven B2B platform in a highly technical industry, quickly building domain knowledge while delivering features on time.
  • Simplified complex data heavy workflows, improving usability and reducing support queries by 30%, which significantly eased the workload of the Customer Success overwhelmed by user confusion.
  • Built a foundation for a design system, delivering scalable components and patterns that enabled engineering teams to move faster and with fewer design-related blockers.
  • PCollaborated closely with Product Managers, Tech Leads, and Engineers to align on priorities, refine requirements, and balance usability with technical feasibility.

Impact: Delivered user-friendly workflows that boosted customer satisfaction, introduced design system foundations that improved engineering efficiency, and supported faster, more consistent feature rollout.

Design System Lead

Amazon

October 2019 - December 2021

  • Led the design system team, delivering over 100 of reusable, responsive components and patterns across platforms with detailed documentation and usage guidelines.
  • Drove global adoption of the system from 15 to 113 products, collaborating with multiple teams worldwide to ensure consistency and scalability across products.
  • Defined the brand foundation, design principles, and UX patterns, creating alignment across business units.
  • Partnered with engineering to streamline handoff processes, reducing implementation time and improving development velocity.

Impact: Delivered a scalable design system that saved significant engineering and design time, improved product consistency, and supported faster, more confident launches across Amazon HR.

UX Designer

Amazon

October 2017 - June 2024

  • Owned end to end design for two large scale, data heavy products and iterated on six others used globally, ensuring consistent and accessible experiences.
  • Partnered with PMs and engineering to translate ambiguous requirements into clear, testable design solutions, reducing churn and rework in the development process.
  • Designed for accessibility (WCAG AA & AAA), with our designs successfully passing compliance audits, making products more inclusive while reducing compliance risks for the business.
  • Relied on data, research, and user testing to guide design decisions, ensuring that customer needs and pain points directly informed product priorities.

Impact: Improved usability and adoption of core Amazon HR tools used by over one million Amazonians worldwide, reduced design-related engineering inefficiencies by clarifying specs upfront, and drove higher customer satisfaction through accessibility and research-driven design.

Skills

End to end UX design

UI Design

Interaction design

Heuristic evaluation

UX Research

User stories

User journeys

User interviews

Usability study

Information architecture

Flow design

UX writing

Wireframing

Prototyping

Presenting

AI driven

Design system building

Designing at scale

Analytics

Native app design

Responsiveness

Accessibility

Localisation

Team leading

Stakeholder management

Handling ambiguity

Handling conflicting requirements

Juggling multiple projects

Always on time

Teamwork

Working under pressure

Innovating & simplifying

Business to business

Branding

Logo

Vidual Design

Print Design

Sound Design

Music production

Video production

Secret projects

Most of my work is confidential. If you wish to have a deeper dive, drop me a quick message and I'll send over the secret case studies.

Other projects

Creative endeavours have occupied most of my free time for as long as I can remember. I enjoy exploring my abilities in all possible areas of the design realm. Creating is what fuels my existence and solving usability problems in everything that surrounds us gives me sense of purpose. If you’re curious of what I do for fun, I’ve got you covered, have a snoop!

Kudos

“I hired Aga as a consultant product designer to assess and refresh our web UI for a SaaS security product, and she exceeded every expectation. Aga delivered immediate tactical improvements while simultaneously creating a visionary product flow that seamlessly integrated upcoming features and initiatives. What impressed me most was her ability to solve existing workflow challenges while significantly improving performance for current users. Aga brought the perfect combination of flexibility, curiosity, and deep user-centric thinking to every aspect of the project. She truly understood our users' jobs-to-be-done and translated that insight into delightful experiences.Beyond her technical expertise, Aga was genuinely enthusiastic and collaborative throughout our engagement. She's the kind of designer who elevates both the product and the team. I'd work with her again without hesitation and recommend her highly for any product design role.”

“I worked with Aga for over three years, where she led our design team and built the foundation of our design system. She’s super quick with prototyping, has great design instincts, and excellent communication skills. Her design skills are outstanding both in web and mobile, and she has leadership skills to manage cross-team projects and conflicting requirements. Aga is a passionate teammate who cares deeply about her work, and is extremely fun to work with!”

“Aga is a UX force of nature. She doesn’t solve problems; she attacks them. She has a truly infectious energy that makes even the toughest challenges achievable. Working with Aga I marvelled at her technical expertise and was often shocked at just how much deep thinking had taken place from session to session. It’s genuinely exciting to work alongside her.”

“Aga is a force of nature when it comes to UX design. She is inquisitive and curious, with strong energy and fun personality. It was a pleasure working alongside her!”

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