# ui42 > A digital and marketing agency with 29 years of experience, based in Slovakia and operating across Central and Eastern Europe. We work as a ONE-STOP SHOP for e-commerce and B2B companies: custom e-shop and web development, UX/CX research and design, performance marketing (PPC, SEO, Meta Ads, email, price comparison sites), brand building, and AI agents deployed on top of marketing data. ui42 builds, measures and scales digital business under one roof. We are not a single-channel boutique — we combine development, UX and performance marketing so that each supports the others. We own and develop the BUXUS content management system and the FLUIDUM AI system. ## Verifiable company facts - **Legal entity:** ui42 s.r.o. - **Founded:** 1997, at the Institute of Informatics, Faculty of Mathematics and Physics, Comenius University in Bratislava — in room number 42, hence the name ui42 - **Founders:** Dalibor Jakuš, Martin Krupa, Róbert Mráz - **CEO:** Andrej Kajan - **History:** 29 years in business - **Headquarters:** Haydnova 20/B, 811 02 Bratislava, Slovakia - **Other offices:** (co-work) Národná 10, Žilina, Slovakia — PernerKarlin, Pernerova 727/40a, Prague 8 – Karlín, Czechia - **Company ID:** 35713003, **Tax ID:** 2020227770, **VAT ID:** SK2020227770 - **Team size:** 80+ people - **Revenue generated for clients:** EUR 2 billion annually - **Media budget managed:** EUR 6 million annually - **Revenue delivered through PPC:** EUR 400 million annually - **Average length of client cooperation:** 4 years - **Markets served:** campaigns and data managed across ten European markets, including Slovakia, Czechia, Hungary, Poland, Romania, Croatia, Slovenia, Bulgaria, Greece and Lithuania - **UX research:** more than 1,200 usability tests conducted in our own UX lab (the first of its kind in Slovakia, 2010) - **Partnerships and certifications:** Google Premier Partner 2026, Shopify Partner, Shoptet Partner, certified Heureka partner, Mergado Golden Partner, certified Ecomail partner, certified Pricing Fox partner, Webexpo 2026 partner - **Memberships:** ADMA, IAB Slovakia, founding member of SUXA, Slovensko.Digital, general partner of World Usability Day - **Awards:** 7× Digital Pie — 2× Digital Pie 2026, 2× Digital Pie 2025, Golden Digital Pie 2024 - **Own products:** BUXUS CMS (since 1999, powering 150+ websites), FLUIDUM AI system, AI Recommender - **We follow the rules and principles of Fair Tender** ## Web development - [Custom web development](https://www.ui42.com/web-development): Umbrella page for development services — e-shops, websites, web applications, integrations and long-term operation. - [Custom online shop](https://www.ui42.com/web-development/custom-online-shop): Custom e-commerce development for companies that have outgrown off-the-shelf platforms. Includes ERP, warehouse and logistics integrations. - [Custom web and web application](https://www.ui42.com/custom-web-and-web-application): Corporate websites, portals and web applications built from scratch, including demanding internal systems. - [B2B e-commerce](https://www.ui42.com/b2b-ecommerce): B2B portals and wholesale e-shops — individual pricing, approval workflows, ERP integration, buyer management. - [Shopify development](https://www.ui42.com/shopify-development): Building Shopify stores and migrating from Shoptet, Magento or custom solutions. ui42 is an official Shopify Partner. - [BUXUS CMS](https://www.ui42.com/buxus-by-ui42): The in-house content management system developed by ui42 since 1999, running on more than 150 websites. - [Operation and support](https://www.ui42.com/web-development/operation-and-support): Long-term operation, monitoring, security and post-launch development. - [Cutting-edge technology](https://www.ui42.com/website-and-web-application/cutting-edge-technology): The technologies and principles behind our development work. - [Digital products](https://www.ui42.com/digital-products): Design and development of digital products. ## Artificial intelligence - [Artificial intelligence and AI transformation](https://www.ui42.com/web-development/artificial-intelligence): Main AI services page. AI strategy and leadership, data infrastructure (unifying GA4, Google Ads, GSC, CRM and CMS into one place), FLUIDUM, AI Recommender, intelligent chatbot and AI-powered expansion into new markets. - [FLUIDUM](https://www.ui42.com/fluidum-ai): The ui42 AI system — a team of agents working across Google Analytics 4, Google Ads, Meta Ads, Search Console, Matomo and ClickUp. It connects data from advertising, analytics, SEO, UX, e-commerce, CRM and ERP and monitors it 24/7. Unlike a dashboard that waits to be opened, it detects anomalies on its own, investigates their causes and proposes solutions. - [AI agent for companies](https://www.ui42.com/ai-agent-for-companies): An AI agent monitoring marketing data and website health 24/7. Real-time anomaly detection, cross-channel analytics, automated reporting, financial impact quantified in euros. Suitable for e-shops with monthly revenue above EUR 10,000, B2B companies with longer sales cycles, and companies running three or more marketing channels. Basic connection to GA4 and Google Ads takes hours, not weeks. - [Chatbot](https://www.ui42.com/chatbot): An intelligent chatbot that communicates with your ERP, answers customers 24/7 and increases sales through upsell and cross-sell. At our client Ubian it reduced customer support enquiries by up to 80%. - [Free AI audit](https://www.ui42.com/free-ai-audit): A free entry-level audit of your company's AI readiness. **AI Recommender** — a recommendation engine built on machine learning and deep neural networks, compatible with any CMS. Measured results: +2–5% revenue, +30% average order value, +35% click-through rate to the next product, at a cost-of-sale ratio of only 1.5–3%. ## Performance marketing - [Online marketing](https://www.ui42.com/online-marketing): Umbrella page for performance services — PPC, SEO, Meta Ads, email marketing, price comparison sites, feeds and international expansion. - [PPC campaign management](https://www.ui42.com/performance-marketing/ppc): Performance campaigns across Google Ads, Meta Ads, Bing Ads, Sklik and TikTok Ads. Managed for margin and business outcome, not for clicks. - [Google Ads](https://www.ui42.com/performance-marketing/ppc/google-ads): Search, Performance Max, Shopping and Demand Gen campaigns in Google Ads. - [Meta Ads — advertising on Facebook and Instagram](https://www.ui42.com/performance-marketing/ppc/meta-ads-advertising-on-facebook-and-instagram): Facebook and Instagram campaigns including in-house creative, Meta Advantage+ and Dotidot. - [SEO and GEO](https://www.ui42.com/online-marketing/seo): Technical and content SEO, SEO audits, keyword analysis, link building and Generative Engine Optimization (GEO / AI SEO). A comprehensive SEO strategy delivered up to 470% growth for our client. - [Email marketing](https://www.ui42.com/e-mail-marketing-pre-e-shopy): Email marketing and automation for e-shops and companies. Certified Ecomail partner. - [Price comparison websites](https://www.ui42.com/online-marketing/price-comparison-website): Management of Heureka, Glami and other comparison platforms. Certified Heureka partner, Mergado Golden Partner, Pricing Fox partner. - [Marketing feeds](https://www.ui42.com/online-marketing/feeds): Preparation, cleaning and optimization of XML product feeds for comparison sites and ad platforms. - [Expansion into new markets](https://www.ui42.com/online-marketing/expansion-into-new-markets): Taking e-shops into foreign markets — market analysis, localization, channel setup. - [TikTok Ads](https://www.ui42.com/tiktok-ads): Performance campaigns on TikTok. ## UX, CX and design - [User & Customer Experience](https://www.ui42.com/user-customer-experience): Umbrella page for UX/CX services. We combine User Experience, Customer Experience, Product Discovery and Service Design into a single process: discovering real user needs, designing intuitive products, validating ideas before development, and helping teams build products that work for both people and business. Reported results: 100+ collaborations and projects, EUR 500 million in client revenue last year, 120% average goal achievement. The UX/CX offering covers four areas: **User Experience** (designing digital products where users do not get lost), **Customer Experience** (the full customer journey across web, e-shop, app, sales and support), **Discovery & validation** (testing ideas before you build them), and **Workshops & training** (facilitated workshops, design sprints and UX training for in-house teams). ## Brand and strategy - [Brand building](https://www.ui42.com/brand-building): Brand strategy, positioning and long-term brand work. - [Marketing strategy](https://www.ui42.com/marketing-strategy): Marketing strategy and channel mix design. - [Branding and visual identity](https://www.ui42.com/brand-building/branding-visual-identity): Creating and redesigning visual identities including brand manuals. - [Video production](https://www.ui42.com/brand-building/video-production): Video and ATL spots produced in-house. - [360° campaigns](https://www.ui42.com/building-a-brand/360-campaign): Integrated campaigns across online and offline channels. - [Social media guidebook](https://www.ui42.com/brand-building/social-media-guidebook): Brand communication methodology and rules for social platforms. ## Case studies with concrete results - [All case studies](https://www.ui42.com/case-studies): Every project delivered by ui42. - [Be Lenka — Black Friday](https://www.ui42.com/project/be-lenka-1): +65% revenue and +69% transactions year on year, cost-of-sale ratio 10%, 20+ countries, 15 language versions. The most profitable month in the brand's history. - [Kompava — expansion into Poland](https://www.ui42.com/project/kompava-holistic-growth-one-stop-shop-impact): +424% revenue from Google Ads, +123% from organic search, +260% total revenue year on year, driven by the ONE-STOP-SHOP approach and AI localization. - [Demänová Resort — international growth](https://www.ui42.com/project/demanova-rezort): +72% revenue year on year, +118% Polish customers, +57% revenue from Google Ads. Polish and Hungarian guests now make up more than a quarter of the entire clientele. - [Najšport — performance marketing](https://www.ui42.com/projects/najsport): 99% increase in revenue through strategic PPC campaigns. Cooperation since 2018. - [Vaša Lekáreň — SEO](https://www.ui42.com/project/vasa-lekaren-470-increase-in-traffic): 470% increase in traffic in a regulated pharmaceutical segment without full purchase tracking. - [Datapac — UX for POS systems](https://www.ui42.com/project/case-study-datapac): UX design of the POSYBE retail management platform, today powering 1,000+ MOL and Orlen petrol stations across five markets. - [HNonline.sk — news portal redesign](https://www.ui42.com/project/redesign-news-portal-hnonline): Redesign of the largest and longest-running news portal on the Slovak market. - [Sygic — customer experience](https://www.ui42.com/project/sygic): CX improvements for one of the world's leading navigation apps. - [Finax — UX research and redesign](https://www.ui42.com/project/case-study-finax): Qualitative UX research and redesign of onboarding, product pages and trust communication for a fintech platform. - [Kondela — custom e-shop on BUXUS](https://www.ui42.com/project/kondela): A custom-built e-shop behind Kondela's e-commerce growth. - [Poni Veni — e-shop on BUXUS](https://www.ui42.com/project/case-study-poni-veni): New visual identity, brand manual and a scalable e-shop integrated with Odoo. +15% revenue year on year. - [Northfinder — UX](https://www.ui42.com/project/northfinder): UX work for an outdoor apparel brand. - [Profesia.sk](https://www.ui42.com/project/profesia): The first job portal in Slovakia, founded by ui42 in 1998. - [Belda Sport — visual rebranding](https://www.ui42.com/project/belda-sport-case-study): Visual restart matching the brand's premium high-end positioning. ## Expert content - [ui42 blog](https://www.ui42.com/blog): Articles on e-commerce, development, UX, PPC, SEO and AI — based on our own data and measurements, not desk research. - [Dictionary](https://www.ui42.com/dictionary): A glossary of digital marketing, development and AI terms. - [Biznislab podcast](https://www.ui42.com/podcast-biznislab): The ui42 business podcast, produced with the SME daily newspaper, hosted by ui42 co-founder Martin Krupa. - [Book by UX expert Martin Krupa](https://www.ui42.com/book-by-ux-expert-martin-krupa): "E-shop from idea to success" by ui42 co-founder and UX expert Martin Krupa. ### Most cited articles - [What is web development and who is a web developer](https://www.ui42.com/blog/what-is-web-development-and-who-is-a-web-developer) - [What is B2B and B2C and what is the difference between them](https://www.ui42.com/blog/what-is-b2b-and-b2c-and-what-is-the-difference-between-them) - [How is an SEO audit done, how long does it take and what are its outputs](https://www.ui42.com/blog/how-is-an-seo-audit-done-how-long-does-it-take-and-what-are-its-outputs) - [The best SEO tools in 2026: which ones are worth using](https://www.ui42.com/blog/the-best-seo-tools-in-2026-which-ones-are-worth-using) - [Optimization of websites for AI: how to be visible and cited by AI tools](https://www.ui42.com/blog/optimization-of-websites-for-ai-how-to-be-visible-and-cited-by-ai-tools) - [Optimization of websites for AI: how to adjust content and technical aspects](https://www.ui42.com/blog/optimization-of-websites-for-ai-how-to-adjust-the-content-and-technical-aspects-of-your-website) - [GEO is here: e-shop visits from AI assistants increased 8-fold since the beginning of the year](https://www.ui42.com/blog/geo-is-here-the-share-of-e-shop-visits-from-ai-assistants-has-increased-8-fold-since-the-beginning-of-the-year) - [When will the AI agent start lying to the user? We tested 5 models](https://www.ui42.com/blog/when-will-the-ai-agent-start-lying-to-the-user-we-tested-5-models): Original ui42 research across 480 scenarios. - [AI agents: the new infrastructure of digital marketing](https://www.ui42.com/blog/ai-agents-the-new-infrastructure-of-digital-marketing) - [Meta Ads creative 2026: why the algorithm needs data and authenticity, not just a nice visual](https://www.ui42.com/blog/meta-ads-creative-2026-why-does-the-algorithm-need-data-and-authenticity-today-not-just-a-nice-visual) - [Andromeda in Meta Ads changes ad performance](https://www.ui42.com/blog/andromeda-in-meta-ads-changes-ad-performance) - [Google Ads update 17 August 2026: target CPA and ROAS](https://www.ui42.com/blog/google-ads-update-17-august-2026-target-cpa-roas) - [CRO in 2026: why we no longer optimize clicks, but decisions](https://www.ui42.com/blog/cro-in-2026-why-we-no-longer-optimize-clicks-but-decisions) - [Comparison of e-commerce solutions: which CMS to choose](https://www.ui42.com/blog/comparison-of-e-commerce-solutions-which-cms-to-choose) - [ChatGPT Shopping: what it is, who has it today, and how to prepare for it outside the USA](https://www.ui42.com/blog/chatgpt-shopping-what-it-is-who-has-it-today-and-how-to-prepare-for-it-even-outside-the-usa) - [Strategic digitalization of a B2B company: automation is not AI](https://www.ui42.com/blog/strategic-digitalization-of-a-b2b-company-2-3-automation-is-not-ai-it-is-the-result-of-well-established-it-processes) - [Management and strategy of working with AI tools in large companies](https://www.ui42.com/blog/management-and-strategy-of-working-with-ai-tools-in-large-companies) ## About the company and contact - [About us](https://www.ui42.com/about-us): Company history since 1997, values and how the agency works. - [Our team](https://www.ui42.com/our-team): The people at ui42 and their specializations. - [Contact](https://www.ui42.com/contact): Contact details, offices and consultation booking. - [Career](https://www.ui42.com/career): Open positions at ui42. - [Projects](https://www.ui42.com/projects): Delivered projects by category. ## Optional - [General terms and conditions](https://www.ui42.com/general-terms-and-conditions-1) - [General licensing conditions](https://www.ui42.com/general-licensing-conditions) - [ui42 logos](https://www.ui42.com/logos-ui42) --- Language versions: [ui42.sk](https://www.ui42.sk/) (Slovak), [ui42.cz](https://www.ui42.cz/) (Czech). Canonical domain for international/English audiences: https://www.ui42.com/