atEnbi

atEnbi is a boutique product development studio based in Poland with 8 in-house experts and over 16 years of combined experience. Founded by Jaroslaw Alexander Ziembinski and Daniel de Nieuwe, the firm focuses on custom web and mobile development, digital product design, and ongoing support for a small roster of global clients. They work with travel tech, fintech, telecom, and e-commerce companies, typically on projects lasting 2+ months for mobile work and 3+ months for web builds.

Services and capabilities

The studio operates across three core service areas. Custom web development covers full-stack builds in Ruby on Rails with individual pricing and timelines of 3+ months. Mobile development spans iOS and Android, also with individual pricing and 2+ months to delivery. Both include product design, market research, ideation, release, and maintenance as standard.

Digital product design is positioned as a full-stack discipline rather than isolated UI/UX work. It encompasses product strategy and discovery (competitor audits, workshops), user research and testing (interviews, surveys, usability tests), information architecture, interaction and interface design in Figma, design systems, prototyping in Figma or Framer, and developer hand-off with design tokens and documentation. Projects run 4–8 weeks. They use Figma and FigJam for design collaboration and Hotjar for post-launch analytics.

Support and maintenance services handle code optimization, code refactoring, and ongoing operational stability for their existing client base. The team stresses customized, scalable solutions rather than off-the-shelf packages.

Notable work

AtEnbi has completed three public case studies. For JRPass (travel tech), they modernized legacy code, stabilized infrastructure, and added new features including SIM card sales while keeping the platform operational during the transition. The work involved platform modernization, eCommerce scalability, SEO optimization, and Adyen payment integration on Ruby on Rails.

JapanDen (travel platform) was rebuilt from an incomplete project into a stable booking platform with real bookings, admin controls, and product flexibility. The rebuild included MVP launch, Ruby on Rails, API integration, a booking system, UX improvements, and Adyen integration.

Nimbus eSIM was built from zero to production as a mobile-first app for global connectivity. The architecture was modular with a scalable provider and plan system, 1-click activation, code-based login, and integrated Stripe, chat, and invoicing APIs. The project included comprehensive product design and end-to-end QA on real devices.

The design work shows measurable results: reduced onboarding drop-off by 38% for a peer-to-peer rental app through simplified account creation and contextual tips; boosted booking conversions by 25% for a travel platform after re-architecting search and checkout flows.

How they work

The design process follows five phases: Discover (workshop, competitive analysis, user interviews), Define (problem statements, success metrics, low-fidelity flows), Design (sketches to high-fidelity UI to interactive prototypes with stakeholder feedback), Validate (usability tests and A/B experiments before engineering commitment), and Deliver (Figma files, documented design system, developer assets in Storybook and Zeplin). Post-launch analytics feed continuous iteration.

For development, engagement is typically project-based with individual pricing. The team stresses involvement in day-to-day decision-making and transparency throughout delivery. All team members have a minimum of 5+ years of industry experience. The studio emphasizes cross-functional collaboration—designers, product managers, and engineers work in parallel rather than sequentially.

Team and credentials

The core team consists of 8 in-house experts. Founders are Jaroslaw Alexander Ziembinski and Daniel de Nieuwe. Named team members include Jakub Dubiel (Senior RoR Developer), Gaston Ferreyra (React and React Native Senior Developer), Leonardo Banchero (Associated JS and .NET Tech Lead), Adam Kozłowski (Associated Senior Designer), Adrian Dziama (Associated Designer), Marcin Olszewski (Associated RoR Tech Lead), Jagoda Pendolska (RoR Developer), and Bartosz Bronikowski (Junior RoR Developer). The website mentions 10+ successful projects completed and 4 global clients. No formal certifications (ISO, SOC 2, HIPAA) are mentioned on the public site. The team offers Japanese language support.