Cross-Platform Mobile App Design | iOS, Android, Flutter

Oleh Mostipan

Starting at

/hr

About this service

Summary

I craft intuitive, high-impact mobile apps for iOS and Android, backed by over 10 years of UX/UI design experience. From early-stage wireframes to polished, developer-ready Figma prototypes, I turn ideas into clean, user-focused interfaces that feel effortless to use. Whether you're building with native tech or Flutter, my designs are built to scale and succeed.

Process

Discovery At the initial stage, I conduct in-depth research on your business, target audience, and goals. Through discussions, analysis, and stakeholder interviews, I immerse myself in the brand’s vision and challenges. This helps me fully understand your strategic objectives, define clear project goals, and outline the scope of work, establishing a solid foundation for everything that follows.

Wireframing The next step involves creating wireframes to visualize the basic structure and functionality of the future product. In this low-fidelity phase, the focus lies on element placement, content hierarchy, and user interaction flow. These wireframes serve as a starting point for initial feedback, ensuring the overall concept aligns with both your expectations and user needs.

High-Fidelity Once the wireframes are approved, I develop high-fidelity designs, incorporating your brand’s color palette, typography, and graphic elements. At this stage, the product begins to reveal its final look and feel: carefully chosen visual accents highlight key features and showcase your brand’s unique style. My goal is to create an interface that is both visually appealing and intuitive to navigate.

Prototyping To provide a more realistic evaluation of the product, I create interactive prototypes that replicate core user scenarios. This lets you and key stakeholders “experience” the product firsthand, assessing its usability, clarity, and effectiveness. It’s an essential step for validating and refining navigation, functionalities, and user flows before moving into development.

Feedback & Iterations I believe in a continuous improvement process, so I incorporate feedback at every stage of the project. After sharing prototypes or high-fidelity designs, I gather your comments and, if necessary, conduct additional user testing or research. All identified improvements are implemented, ensuring the design is refined both visually and functionally to align closely with your vision.

Handoff & Support In the final stage, I prepare and hand over all essential documentation, design specifications, and assets to developers to facilitate a smooth implementation. I remain available throughout the development cycle, offering prompt support and clarification whenever needed. After launch, I can continue providing design assistance to help your product grow and adapt as user and business needs evolve.

FAQs

Do you also develop the app?
Development is available as a separate service. This listing focuses exclusively on UI/UX design. If you're looking for full-cycle app development, I’d be happy to connect you with my extended service offering or development partners.
How many screens are included?
There’s no strict screen limit. I design all the screens your app needs based on your project scope and user flows — from onboarding to settings and everything in between.
What makes you different?
With 10+ years of experience in mobile design, I combine product strategy with clean, intuitive UI. My focus is on user experience, visual clarity, and developer-friendly handoff designs that look great and work great.
Can you follow my brand style?
Absolutely. I can seamlessly follow your existing brand guidelines or help shape a new visual identity tailored to your app.
How long will the project take?
Most app design projects are completed within 1–2 weeks, depending on complexity and scope. I’ll provide a clear timeline after discussing your specific needs.

What's included

Mobile App UI Design (iOS & Android)
Polished, high-fidelity user interface designs tailored for both iOS and Android. Delivered via Figma with a complete design system and neatly organized layers.
User Flow & Wireframes
Low-fidelity wireframes and user flow diagrams that map out the app’s structure and navigation to ensure a smooth and intuitive user experience.
Developer Handoff Package
Comprehensive Figma file includes a component library, export-ready assets, Lottie animations (if needed), and developer notes for a seamless transition to development compatible with Flutter and other frameworks.
Interactive Clickable Prototype
A fully interactive Figma prototype showcasing user journeys and screen transitions — ideal for client presentations, usability testing, and internal reviews.
App Icon & Store Assets
Custom-designed app icon and promotional screenshots for the App Store and Google Play — crafted to match your app’s branding and appeal.

Example projects