I help SaaS teams turn complex problems into interfaces that engineers can build and users can actually use. Currently focused on data-heavy platforms where every pixel has to earn its place.
Design system and design language for a new AI product, built from zero as the lead designer.
Arkieva is a supply-chain company with a range of products designed to help businesses plan and optimize their operations.
Bulgarian retail bank, commissioned a UX audit of their home loan application service to identify drop-off points in the customer journey and uncover opportunities for improvement.
A design sprint and usability study for the LucidLink desktop client, improving how users switch filespaces and accounts, validated with Maze and measurable task-time improvements.
I don't ship feature lists — I ship outcomes. Three areas where design directly moves the business.
I turn domain-heavy complexity into daily-use SaaS — dashboards people trust, workflows they adopt, and prototypes that validate bets before engineering commits.
I build design infrastructure that scales with the business — reusable systems, tighter dev handoff, and AI-accelerated iteration without sacrificing intent.
I ground product decisions in real user signal and raise quality across squads — research that shifts roadmap, critique that compounds craft.
If you are in need of an excellent web designer, I highly recommend Martin on behalf of our design department. He has devotedly worked at our company for the past 6 months, overcoming difficulties and challenges of our dynamic industry. He is easy to work with and has an outstanding ability of implementing ideas, concepts and changes, all with high-end web expertise. Martin has helped us a lot get where we are today.
The level of detail and professionalism that Martin invested in the project was clearly visible. The quality work he does for NEXT TV is key in the success of the project.
I have been Martin's immediate supervisor for several years. I found him to be consistently pleasant, tackling all assignments with dedication and a smile. Besides being a joy to work with, Martin Castellow is a take-charge person who is able to present creative ideas and communicate the benefits. He has successfully designed several websites for our company that has resulted in increased revenue.
Have you seen his logos? I was dazzled by his capacity to create spot-on logos within a short deadline. Moreover, Martin protects his creative ideas to the right extend, placing the customers' needs as a common goal and working towards the best outcome. This results in splendid UI solutions in several of the Bulpros' products that we are working on. I am always grateful to discuss a UX side of a given project with him, as I know he will bring both knowledge and vigor to it. You should also check his in-depth 3DS-max tutorials on YouTube, which prove his commitment to a zealous career in the design field.
As far as professional details go, Martin's skill set goes way beyond web design. He is knowledgeable about every aspect relevant to his job. He has the perfect balance between creativity and technical expertise, which allows his solutions to be implemented on a short term. As for the person, Martin is dedicated and radiant, good for office morale, and doesn't hesitate to provide insight where he feels it's needed.
