TwentyOne Digital Agency

Based in Glifada, Greece, TwentyOne Digital Agency describes itself as a compact team of engineers and design enthusiasts working on custom web software from product strategy through to production. Founded in 2008, the agency operates with a small team of one to ten people and splits its work into two practices: custom product engineering for clients with complex technical problems, and a hospitality vertical serving hotels, boutique groups and resorts. Clients named on the site include Avene, Cosmote, TOUR TRVL, Piraeus Bank, Scorpios, Marriott and Hilton, among others. The agency's stated services cover custom web development, custom ecommerce, mobile application development, and UI/UX design, built on a stack that includes React, Node.js, TypeScript, PostgreSQL, Elasticsearch, Next.js, AWS, PostGIS, GraphQL, WebSockets, Stripe and Tailwind. Described work includes booking engines, property management system extensions, guest apps and operations dashboards for hospitality clients, as well as headless storefronts and checkout systems integrated with Stripe or Adyen and ERP/OMS platforms. For search- and data-heavy systems, the agency describes work on Elasticsearch tuning, query optimisation, event pipelines and observability. Design work is carried out alongside engineering, covering design systems, product UX, prototyping and accessibility, with the aim of keeping design and development closely aligned rather than handled as separate stages. Engagements are structured around individual project needs rather than fixed service tiers.