We Build for the
Ambitious
Rubex UI was founded with one conviction: the best web work happens when engineering rigor meets thoughtful design. We're a small team with a large footprint.
A studio built on craft and clarity
Rubex UI is a boutique web development agency headquartered in Kyiv, Ukraine. We partner with startups, scale-ups, and established brands to design and build digital products that perform — technically and commercially.
Since 2019, we've shipped over 50 projects across 20+ countries. Our clients span fintech, SaaS, e-commerce, and media — united by a shared insistence on quality.
We're not an agency in the traditional sense. We operate more like an embedded product team: opinionated, outcome-focused, and invested in your success beyond the delivery date.
Projects Delivered
Countries Served
Years Experience
Client Retention
We exist to raise the bar
Our mission is to make high-quality web engineering accessible to ambitious businesses everywhere — not just those in Silicon Valley or Berlin.
"Every pixel, every millisecond, every interaction is an opportunity to make something better. We believe the web should be fast, beautiful, and built to last — and we hold every project we ship to that standard."
— Rubex UI Founding Principles
What we stand for
Craft Over Volume
We take on fewer projects so we can give each one the full attention it deserves. Quality is non-negotiable.
Radical Transparency
No surprises. You'll always know where your project stands, what's been done, and what's coming next.
Performance First
Speed is a feature. Every line of code is written with performance in mind — for users and for search engines.
Global Thinking
We build for the world. Accessibility, internationalisation, and inclusive design are built into our workflow.
Long-Term Partnership
We care about outcomes, not just outputs. Our best relationships are the ones that span years, not weeks.
Continuous Improvement
We ship, we measure, we refine. Every project makes us better at the next one.
Small team, large impact
A tight-knit group of developers, designers, and strategists who care deeply about the work we put into the world.
Oleksiy Koval
Founder & Lead DeveloperFull-stack engineer with 8+ years in React, Node.js, and cloud infrastructure.
Marta Petrenko
Head of DesignUI/UX designer specialising in B2B SaaS and high-conversion landing pages.
Dmytro Hrytsenko
Frontend EngineerTypeScript enthusiast and performance obsessive. Accessibility advocate.
Anastasiia Volyk
Project ManagerKeeps projects on track and clients informed. Masters of Notion and calm.
Kyiv: Europe's rising tech capital
Ukraine has one of the highest concentrations of software engineers in Europe. Kyiv's tech ecosystem is vibrant, battle-tested, and deeply internationally oriented — producing world-class engineers who work to global standards.
200,000+ Tech Professionals
Ukraine ranks among Europe's top countries for IT workforce density.
Strong Engineering Education
Top technical universities feed a steady pipeline of skilled graduates.
Global-Ready Talent
High English proficiency and experience partnering with EU and US clients.
Proudly Ukrainian
We're proud to represent Ukrainian engineering talent on the global stage. Our work is our contribution to a thriving, independent digital economy.
Let's make something great.
We're selective about the projects we take on — which means every client gets our full attention.