Strong visual design skills, being able to create aesthetically pleasing interfaces
Crafting experiences – understanding user needs, how to translate them into product design decisions
Attention to detail in everything you do
Iterative design and development process: The temporary solution might be the permanent one: Knowing when to make compromises and making thought through decisions that benefit the business and the user
You understand how to identify a problem and know how to solve it with a designed solution
Knowing when to respect platform conventions, when to design something new
Knowing how to apply given styles to a product to keep the experience, look and feel and brand familiar on the platform but also consistent between platforms
Visual design and Editorial design knowledge: How to apply typography, building layouts, visual hierarchy, the use of color
Ability to be able to form, prototype and confidently present ideas
Always interested in ways to help others make their work easier – solution oriented mindset
Knowing the worth of UX copy and how it can be applied
Being able to work with UX copy writers, guide them into the right direction of what your design needs that is concise and reaching the goal
Knowing the use of illustration, collaborating within a design team: Encouraging others, supporting their ideas, moving forward as a team
Experience in marketing design(branding, web design, how to marketing a product or feature and present it on various channels)
End to end user flow thinking: You don’t create screens and a simple user flow, you need to know the whole context, where the user is coming from, their emotional state, what tasks they want to accomplish and how they should get there in an intuitive manner
Know the worth of transitions, animations, tap targets, tap/click/hover states: For engaging experiences
Get familiar with user research practices like user interviews, how to filter out needs and turn these into design solutions
Accessibility knowledge: What is important when using colors in a product, how do people navigate through a product(keyboard shortcuts?), How does contrast work?, who is using your product?(including color blind people?)
Knowing how to give specific and productive feedback and design critiques – good resource: http://howtocrit.com
Being able to work inside a team, because you will always have to communicate your designs to a developer who brings your work to life
Basic understanding of other disciplines in the field
Knowing how to prioritize your work and communicate your deisgn reasonings and decisions
Writing design specs: Documenting your design decisions, user flows in written form with media that helps to visualize your designs, clearly understandable by anyone on the team: Developers, marketers, support team - example: https://www.dropbox.com/s/j70zr9se563lzc0/Twist_%40mentions.pdf?dl=0
Be kind, thoughtful, communicative and show empathy.
Bonus:
Icon work knowledge: More associated to visual designers, but a plus if available
Knowledge of HTML, CSS and GIT to emphasize with the work of developers, it will help you and them to find the best solutions
Leadership qualities: How to communicate between different teams, following up, guiding them to the goals, setting deadlines, leading large-scale projects
Experience 3D design, coding, people management, the whole business