# UI/UX Design > Intuitive interfaces that engage and convert. UX research, wireframes, prototypes and design systems for a memorable user experience. Page: https://eldev.fr/en/services/ui-ux-design/ · Version française: https://eldev.fr/services/design-ui-ux/index.md · [Home](https://eldev.fr/en/index.md) We craft intuitive and memorable interfaces that put the user at the center of every decision. From UX research to high-fidelity mockups, through wireframes and interactive prototypes, our design process is iterative and results-driven. We create consistent design systems, optimized user journeys and interfaces that combine aesthetics with performance, for both [web products](https://eldev.fr/en/services/web-development/index.md) and [mobile applications](https://eldev.fr/en/services/mobile-apps/index.md). ## Capabilities ### UX research Ergonomic audit, personas and optimized user journeys. We analyze your users' behavior to design interfaces that meet their expectations and eliminate friction points. ### Wireframes Functional mockups to validate information architecture before development. Save time and money by testing concepts early, without writing a single line of code. ### Design system Reusable components, typography and consistent color palettes. A well-built design system speeds up development, ensures visual consistency and makes future updates easier. ### Prototyping Interactive Figma prototypes to test and iterate before production. Validate user journeys, gather concrete feedback and refine the experience before investing in development. ## Who is this service for? Ageing interface, falling conversions or a product still on paper, design makes the difference. It applies to a [hotel booking journey](https://eldev.fr/en/sectors/hotels/index.md) as much as to a SaaS dashboard. - Existing app, website or [online store](https://eldev.fr/en/services/e-commerce/index.md) with dated UX, declining conversion rate and users dropping off - Product in conception (SaaS, mobile app) that needs validated Figma flows before dev kicks off - Dev team without a dedicated designer, ad-hoc design support on critical screens or a partial redesign - [Startup or scale-up](https://eldev.fr/en/sectors/startups-saas/index.md) that needs a design system to maintain visual consistency as the team grows ## How it works. We start with user research: interviews, existing product audit and competitive analysis. Wireframes are validated before high-fidelity mockups. User testing allows us to iterate until we reach the optimal experience. ## What makes the difference. Design driven by results, not aesthetics alone. Every design decision is backed by user data and aligned with your business objectives. ## Frequently asked questions. ### Do you work in Figma? Figma is our primary tool for wireframes, high-fidelity mockups and interactive prototypes, it's the industry standard, compatible with all development workflows (Dev Mode, CSS exports, Zeplin). For design systems we use Figma Variables and auto-layout components. If your team already works in Sketch or Adobe XD, we can adapt. Figma files are shared with you at every milestone: you retain full ownership of the source files. ### How much does a UI/UX redesign cost? Cost depends on scope: a UX audit with recommendations, a full redesign of 10 to 20 screens or a landing page design are very different engagements. Every project is scoped after a detailed brief, [get in touch](https://eldev.fr/en/contact/index.md) for an estimate within 12 hours. ### How long does it take to build a design system? A complete design system (tokens, components, documentation and guidelines) takes 4 to 8 weeks depending on interface complexity. We always start with an audit of what already exists, typically 30 to 40% of components can be rationalised rather than rebuilt from scratch. A partial design system covering your most-used components can be delivered in 2 to 3 weeks. Delivery includes Figma documentation and, if needed, support for your [development team](https://eldev.fr/en/services/web-development/index.md) during integration. Budget is set after a scoping call. ### Is user research included? User research is offered as an option or baked in depending on the project. For redesigns, we systematically start with an ergonomic audit of the existing product (heatmaps, user flows, friction points) included in the scoping phase. In-depth user interviews, concept tests or A/B tests are scoped separately depending on the number of sessions. If your product is still in conception, we work from your existing personas and analytics, or help build those personas if they don't exist yet. ### What do you deliver, designs or integrated code? Our deliverables are annotated Figma files (high-fidelity mockups, interactive prototype, design tokens), not code. Integration is a separate step you can hand off to your in-house dev team or to our [web development](https://eldev.fr/en/services/web-development/index.md) or [mobile app](https://eldev.fr/en/services/mobile-apps/index.md) service. Figma files include full technical specs (spacing, colours, component states, breakpoints) so your developers never have to guess. We remain available to answer integration questions throughout the development phase. ## Other services - [Web Development](https://eldev.fr/en/services/web-development/index.md): Custom sites & apps - [E-commerce](https://eldev.fr/en/services/e-commerce/index.md): Stores that convert - [Mobile Apps](https://eldev.fr/en/services/mobile-apps/index.md): iOS & Android - [Artificial Intelligence](https://eldev.fr/en/services/artificial-intelligence/index.md): Automation & chatbots - [WordPress & CMS](https://eldev.fr/en/services/wordpress-cms/index.md): Content management - [Desktop Apps](https://eldev.fr/en/services/desktop-apps/index.md): Cross-platform desktop - [Hosting & Infra](https://eldev.fr/en/services/hosting-infra/index.md): Servers & deployment - [Maintenance](https://eldev.fr/en/services/maintenance/index.md): Ongoing support - [ERP & Consulting](https://eldev.fr/en/services/erp-consulting/index.md): Integrated management & audit - [Website Repair](https://eldev.fr/en/services/website-repair/index.md): Emergency, picked up within 2 hours ## Contact [Contact form](https://eldev.fr/en/contact/index.md) (HTML page: https://eldev.fr/en/contact/) · Email: contact@eldev.fr · First chat is free. Response within 12 hours on business days.