App Designer - Native iOS/Android mit Spezialisierung auf individuelle UI-Formate (m/w/d)

📍 Job Overview

Job Title: App Designer - Native iOS/Android with Specialization in Custom UI Formats (m/f/d)

Company: flatexDEGIRO AG

Location: Berlin, Germany

Job Type: Full-time

Category: Mobile App Design & Development

Date Posted: April 22, 2026

Experience Level: Mid-Level (2-5 years)

Remote Status: Hybrid

🚀 Role Summary

• Design and develop sophisticated, custom-designed native mobile app interfaces for iOS and Android platforms.

• Implement high-performance visual interactions and bespoke UI components, focusing on user experience and aesthetic appeal.

• Collaborate closely with cross-functional teams, including Mobile Engineering, Backend, and Product Management, to deliver seamless brokerage features.

• Optimize app performance, user guidance, and accessibility standards to ensure a superior user journey.

• Leverage expertise in Swift/SwiftUI for iOS and Kotlin/Compose for Android to create innovative and engaging mobile experiences within the fintech sector.

📝 Enhancement Note: This role bridges the gap between UI/UX design and native mobile development, requiring a strong portfolio demonstrating both creative design capabilities and robust technical implementation skills, particularly in custom UI elements and animations. The focus on brokerage features indicates a need for understanding financial workflows and data visualization.

📈 Primary Responsibilities

• Conceptualize, design, and craft unique UI elements and intricate interaction patterns for native mobile applications.

• Develop native applications for iOS using Swift/SwiftUI and for Android using Kotlin/Compose.

• Create high-performance UI animations and tailor-made components that enhance user engagement.

• Design and implement core brokerage features, including order flows, portfolio views, and charting modules.

• Foster close collaboration with Mobile Engineering, Backend, and Product Teams to ensure cohesive product development.

• Drive performance optimization, refine user guidance, and ensure accessibility compliance across all app features.

• Translate complex financial data and user requirements into intuitive and visually appealing mobile interfaces.

• Contribute to the continuous improvement of the mobile platform through innovative design and development solutions.

📝 Enhancement Note: The responsibility for "classic brokerage features" implies a need for understanding financial transaction processes, real-time data display, and compliance requirements within a regulated industry, which are critical for effective UI/UX design in this context.

🎓 Skills & Qualifications

Education: While not explicitly stated, a Bachelor's degree in Computer Science, Design, Human-Computer Interaction, or a related field is typically expected for roles of this nature. Equivalent practical experience will also be considered.

Experience: Minimum of 2-5 years of progressive experience in native iOS and/or Android development, with a significant focus on UI design and implementation.

Required Skills:

• Proven multi-year experience in native iOS (Swift/SwiftUI) and/or Android (Kotlin/Compose) development.

• Deep understanding of UI/UX design principles and best practices for mobile applications.

• Demonstrated experience in implementing custom UI components and sophisticated animations.

• Familiarity with financial/brokerage-specific user journeys and feature sets.

• Proficiency with design and prototyping tools such as Figma, Sketch, or Adobe XD.

• Solid understanding of API integration concepts, including REST and JSON.

• High level of creativity and a strong affinity for design aesthetics.

• Technical understanding and a meticulous approach to work.

Preferred Skills:

• Experience in designing and developing complex charting modules or financial data visualizations.

• Knowledge of accessibility standards (e.g., WCAG) and their implementation in mobile apps.

• Familiarity with agile development methodologies and CI/CD pipelines.

• Experience with performance profiling and optimization tools for mobile applications.

• Understanding of backend systems and data structures relevant to financial platforms.

📝 Enhancement Note: The requirement for "several years of experience" suggests a mid-level to senior role, where candidates are expected to contribute independently and mentor junior team members. The emphasis on custom UI and animations indicates a need for a strong visual portfolio and a deep technical understanding of rendering and animation frameworks.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• A comprehensive portfolio showcasing a range of native mobile app designs and developed features, with a strong emphasis on custom UI elements and complex animations.

• Detailed case studies demonstrating problem-solving skills in UI/UX design and native development for iOS and Android.

• Examples of financial or brokerage-related app features designed and implemented, highlighting user flows for order placement, portfolio management, or data visualization.

• Demonstrations of how custom UI components were built, including technical implementation details and design rationale.

Process Documentation:

• Case studies should clearly outline the design process, from initial concept and wireframing to final implementation and user testing.

• Documentation of how performance metrics were tracked and improved through UI/UX design and development optimizations.

• Examples of how accessibility standards were integrated into the design and development workflow.

• Presentation of how API integrations were handled and data was effectively managed within the UI.

📝 Enhancement Note: For this role, the portfolio is paramount. It should explicitly highlight projects where the candidate designed and built unique UI elements and animations, rather than relying solely on standard UI kits. Demonstrating the ability to work with Swift/SwiftUI and Kotlin/Compose in the portfolio is crucial.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for experienced App Designers/Developers specializing in native iOS/Android with UI expertise in Berlin, Germany, a competitive salary range of €65,000 - €90,000 per annum is estimated. This range accounts for the specified experience level (2-5 years), the specialized skill set, and the cost of living in Berlin.

Benefits:

• Flexible working hours and "work@home" options promoting work-life balance.

• Generous 30 days of paid annual leave.

• Mobility Benefit: Employer contribution towards the Deutschland Jobticket.

• E-Mobility Benefit: Subsidized leasing of e-bikes, e-scooters, and e-rollers (after probation).

• Opportunities for personal and professional development with access to relevant courses.

• 100% coverage of Kita (childcare) costs, including meals (after probation).

• Company occupational pension scheme (after probation).

• A challenging role within an international, fast-growing company.

• Competitive salary and an annual voluntary bonus.

• Significant autonomy in task execution and career path shaping.

• Opportunity to work within a new, enthusiastic team of like-minded experts.

• Daily provision of fruit, coffee, drinks, and snacks.

• Provision of a company laptop, monitor, and headphones for optimal remote work.

• Choice between a Pluxee Benefits Pass (€50) or the EGYM Wellpass for personalized well-being.

• Generous referral bonus for successful candidate referrals.

Working Hours: The standard working hours are likely around 40 hours per week, with an emphasis on flexible scheduling to accommodate hybrid work arrangements and individual needs.

📝 Enhancement Note: The provided benefits are quite comprehensive and attractive, especially the childcare support and e-mobility options, which are significant perks. The salary estimate is based on general market data for tech roles in Berlin; actual compensation may vary based on final negotiation and specific experience.

🎯 Team & Company Context

🏢 Company Culture

Industry: Financial Services / Fintech, specifically Online Brokerage. flatexDEGIRO operates at the intersection of finance and technology, aiming to democratize access to financial markets through a leading digital platform. This environment is characterized by rapid innovation, a strong focus on technology, and a commitment to customer service.

Company Size: The company operates as a large enterprise, with over 3.5 million customer accounts and significant transaction volumes. This scale implies robust processes, a structured environment, and opportunities for impact within a large organization.

Founded: flatexDEGIRO SE is a result of mergers and growth, with flatex being founded in 2006 and DEGIRO in 2008, merging to form a dominant European online brokerage. This history suggests a culture that values innovation, agility, and strategic growth.

Team Structure:

• The operations team likely consists of specialized units for Mobile Engineering, Backend Development, Product Management, and UI/UX Design.

• The App Designer role will report into a Head of Mobile Development or a Product Lead, with close collaboration expected across various engineering disciplines.

Methodology:

• The company emphasizes a data-driven approach, leveraging analytics to understand user behavior and optimize platform performance.

• Agile methodologies are likely employed for rapid iteration and development cycles in the fast-paced fintech environment.

• A strong focus on efficiency and scalability is inherent in their business model, aiming to provide cost-effective services to a large customer base.

Company Website: https://www.flatexdegiro.com/

📝 Enhancement Note: The fintech industry demands a high level of precision, security, and regulatory compliance. For a designer/developer, this means understanding the implications of UI/UX decisions on user trust, transaction security, and regulatory adherence, particularly within the context of brokerage services.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a Mid-Level App Designer with specialization in native iOS/Android development. It requires a solid foundation in mobile UI/UX principles and practical experience in translating designs into functional code. The role offers the opportunity to move towards Senior App Designer, Lead UI/UX Designer, or potentially a specialized role in mobile architecture or animation engineering.

Reporting Structure: The App Designer will likely report to a Team Lead for Mobile Development or a Product Manager within the Product & Engineering department. They will work collaboratively with a team of native iOS and Android developers, backend engineers, and product specialists.

Operations Impact: The App Designer plays a critical role in shaping the user experience of flatexDEGIRO's mobile platforms. By creating intuitive, engaging, and performant interfaces for brokerage services, they directly influence customer adoption, satisfaction, retention, and ultimately, transaction volume and revenue generation. Their work contributes to the company's competitive edge in the rapidly growing online brokerage market.

Growth Opportunities:

• Specialization: Deepen expertise in specific areas like advanced mobile animations, accessibility design, or performance optimization for financial applications.

• Leadership: Transition into a Lead App Designer role, mentoring junior designers and overseeing design projects.

• Cross-functional Mobility: Develop skills in product management, mobile architecture, or even backend integration, leveraging a holistic understanding of the product lifecycle.

• Industry Expertise: Become a subject matter expert in fintech UX/UI, a highly sought-after skill set.

• Continuous Learning: Access to training, courses, and industry conferences to stay abreast of the latest mobile design and development trends.

📝 Enhancement Note: The emphasis on "shaping the user experience" and "direct influence on customer adoption" highlights the strategic importance of this role. Candidates should prepare to articulate how their design and development skills contribute to business objectives and user engagement metrics.

🌐 Work Environment

Office Type: The role is described as Hybrid, indicating a blend of remote work and in-office presence. The company offers flexibility, with employees not required to be in the office daily but encouraged to come in for collaboration and team engagement.

Office Location(s): The primary location for this role is Berlin, Germany. The company provides a laptop, monitor, and headphones for an optimized work-from-home setup, suggesting a commitment to supporting remote work infrastructure.

Workspace Context:

• The Berlin office likely provides a modern and collaborative workspace designed to foster team interaction and innovation.

• Access to up-to-date technology and tools is implied, supporting efficient design and development workflows.

• The team environment is described as new and enthusiastic, suggesting a dynamic and forward-thinking atmosphere where collaboration is valued.

• The availability of daily fruit, coffee, drinks, and snacks in the office enhances the employee experience.

Work Schedule: Flexible working hours are a key benefit, allowing employees to manage their schedules effectively. While the standard is likely 40 hours per week, the flexibility enables individuals to balance professional responsibilities with personal needs, which is crucial for design and development roles requiring focused work periods.

📝 Enhancement Note: The hybrid model with flexible hours is a strong indicator of a modern work culture that values employee autonomy and well-being. Candidates should consider how they thrive in a flexible environment and how they would maintain strong communication and collaboration with their team, both remotely and in the office.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A review of your CV and portfolio to assess qualifications and experience. This is where your showcased custom UI designs and native development projects will be scrutinized.

• Technical Interview(s): In-depth discussions and potentially coding challenges focused on Swift/SwiftUI, Kotlin/Compose, UI animation techniques, and problem-solving for complex UI scenarios. Expect questions about API integration and performance optimization.

• Design/Portfolio Review: A dedicated session to walk through your portfolio. Be prepared to discuss your design process, technical implementation choices, challenges faced, and how your work directly contributed to user experience improvements and business goals.

• Team/Cultural Fit Interview: An opportunity to meet potential colleagues and discuss team dynamics, collaboration style, and how you align with the company's values and fast-paced fintech culture.

• Final Interview: Potentially with a senior leader to discuss overall fit and strategic contributions.

Portfolio Review Tips:

• Highlight Customization: Clearly showcase projects where you designed and built unique UI elements and animations from scratch. Use clear visuals and concise descriptions.

• Demonstrate Technical Proficiency: For each relevant project, provide insights into the native technologies (SwiftUI, Compose) and libraries used. Include links to live apps or code repositories if possible.

• Explain Your Process: Detail your design thinking – from understanding user needs and business goals to wireframing, prototyping, and iterating based on feedback.

• Quantify Impact: Whenever possible, use metrics to demonstrate the success of your designs and implementations (e.g., improved conversion rates, reduced load times, increased user engagement).

• Tailor to Brokerage: If you have experience in finance or brokerage apps, emphasize it. If not, draw parallels from other complex domains where you've dealt with data visualization, transaction flows, or intricate user interfaces.

• Be Ready for Live Coding/Whiteboarding: Prepare for exercises that test your ability to implement UI components or solve design challenges in real-time.

Challenge Preparation:

• UI Implementation: Practice building common UI patterns and custom components in Swift/SwiftUI and Kotlin/Compose.

• Animation Logic: Be ready to discuss or implement subtle animations that enhance user experience without hindering performance.

• Problem-Solving Scenarios: Prepare to tackle hypothetical design challenges related to brokerage features (e.g., designing a clear order entry screen, visualizing complex portfolio data).

• API Integration: Understand how UI elements interact with APIs and how to handle data fetching and display.

📝 Enhancement Note: The emphasis on "custom UI formats" and "performant visual interactions" means your portfolio should go beyond standard mobile app designs. Be prepared to discuss the technical underpinnings of your custom UI elements and animations, demonstrating a deep understanding of native mobile rendering and animation frameworks.

🛠 Tools & Technology Stack

Primary Tools:

• Native iOS Development: Swift, SwiftUI

• Native Android Development: Kotlin, Jetpack Compose

• Design & Prototyping: Figma, Sketch, Adobe XD (proficiency in at least one is essential)

• API Integration: REST, JSON (understanding how to consume and display data from APIs)

• Animation Tools: Potentially tools like Lottie or native animation frameworks for iOS/Android.

Analytics & Reporting:

• While not explicitly listed for this role, expect to interact with data from analytics platforms (e.g., Firebase Analytics, Mixpanel) to understand user behavior and app performance.

CRM & Automation:

• Not directly applicable to the App Designer role, but understanding how the app integrates with backend systems and potentially CRM data flow is beneficial.

📝 Enhancement Note: The core technical stack is clearly defined: Swift/SwiftUI for iOS and Kotlin/Compose for Android, alongside industry-standard design tools. Candidates must demonstrate strong practical skills in these areas, especially in leveraging the declarative UI frameworks (SwiftUI and Compose) for creating custom and performant interfaces.

👥 Team Culture & Values

Operations Values:

• Customer Centricity: A strong focus on delivering exceptional user experiences that meet the needs of millions of retail investors.

• Innovation & Agility: Embracing new technologies and methodologies to stay ahead in the competitive fintech landscape.

• Efficiency & Scalability: Building robust systems and processes that can handle massive transaction volumes and user growth.

• Collaboration & Teamwork: Fostering a supportive environment where cross-functional teams work together to achieve common goals.

• Precision & Quality: Maintaining high standards in design, development, and execution, especially crucial in financial services.

Collaboration Style:

• The culture likely promotes open communication and feedback loops between designers, developers, and product managers.

• Expect a collaborative approach where ideas are shared freely, and constructive criticism is used for continuous improvement.

• The "new, enthusiastic team" suggests a dynamic and proactive working environment where team members are encouraged to contribute and take ownership.

📝 Enhancement Note: In a fintech environment, trust and reliability are paramount. This translates into a culture that values meticulousness, rigorous testing, and clear communication to ensure the integrity and security of financial services.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing Customization with Performance: Creating highly customized UI elements and animations while ensuring optimal app performance and responsiveness across various devices.

• Complexity of Brokerage Features: Designing intuitive interfaces for complex financial transactions, data visualizations, and real-time market data.

• Cross-Platform Consistency: Maintaining a cohesive brand identity and user experience across both iOS and Android platforms, despite their differing design paradigms.

• Rapidly Evolving Technology: Keeping pace with the fast-changing landscape of mobile design trends, new framework features (SwiftUI, Compose), and platform updates.

Learning & Development Opportunities:

• Advanced UI/Animation Techniques: Opportunities to explore and implement cutting-edge animation libraries and custom UI rendering techniques.

• Fintech UX Specialization: Deep dive into the unique challenges and best practices of designing for financial applications.

• Mentorship: Learning from experienced senior developers and designers within the mobile team.

• Conferences & Training: Access to industry events and online courses to enhance skills in native development, UI/UX design, and emerging technologies.

📝 Enhancement Note: The challenges highlight the need for a candidate who is not only technically proficient but also a creative problem-solver who can navigate the complexities of a regulated industry while pushing the boundaries of mobile UI/UX.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you designed and implemented a complex, custom UI component. What was the challenge, your approach, and the outcome?" (Focus on technical details and user impact).

• "How do you ensure a balance between creative design ambition and the technical constraints of native mobile development (SwiftUI/Compose)?"

Company & Culture Questions:

• "What interests you about working in the fintech industry and specifically at flatexDEGIRO?"

• "How do you approach collaboration with engineers and product managers when there are differing opinions on design or implementation?"

Portfolio Presentation Strategy:

• Structure Your Narrative: For each project, clearly state the problem, your role, your solution (design and technical implementation), and the results.

• Show, Don't Just Tell: Use high-quality visuals, interactive prototypes, or short video demonstrations of your custom UI elements and animations in action.

• Highlight Technical Implementation: Be prepared to discuss the specific Swift/SwiftUI or Kotlin/Compose code and frameworks used to bring your designs to life.

• Quantify Success: Use metrics to demonstrate the impact of your work on user engagement, performance, or conversion.

• Focus on Customization: Emphasize projects that showcase your ability to create unique, bespoke UI experiences beyond standard components.

📝 Enhancement Note: When presenting your portfolio, be ready to dive deep into the technical aspects of your custom UI implementations. The company is looking for individuals who can not only design beautifully but also engineer those designs effectively using modern native frameworks.

📌 Application Steps

To apply for this App Designer position:

• Submit your application through the provided online portal on the flatexDEGIRO careers website.

• Curate Your Portfolio: Select 2-3 of your strongest projects that best showcase your custom UI design skills and native iOS/Android development experience, particularly those involving complex animations or bespoke components. Ensure each project clearly outlines the problem, your solution, and the impact.

• Tailor Your CV: Highlight your experience with Swift/SwiftUI, Kotlin/Compose, UI/UX design principles, and design tools like Figma. Quantify your achievements and responsibilities where possible, using keywords from the job description.

• Prepare Your Portfolio Presentation: Practice walking through your portfolio, focusing on your design process, technical implementation details, and the outcomes of your projects. Be ready to discuss your approach to performance optimization and accessibility.

• Research flatexDEGIRO: Understand their business, their current app offerings, and their position in the fintech market. Prepare to articulate why you are a good fit for their specific culture and mission.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.