App Designer (UI/UX) - Founding Member (m/w/d) - AI Health

📍 Job Overview

Job Title: App Designer (UI/UX) - Founding Member (m/w/d) - AI Health

Company: O App (Holistic Health)

Location: Germany (Remote - Worldwide)

Job Type: Contractor (with potential for full-time and Co-Founder role)

Category: UI/UX Design, Product Design, Health Tech

Date Posted: April 27, 2026

Experience Level: Mid-Level to Senior (2-5 years implied)

Remote Status: Fully Remote

🚀 Role Summary

• Founding Member Opportunity: This role offers a unique opportunity to be a foundational member of a health tech startup, shaping its product and visual identity from the ground up.

• Holistic AI Health App Design: Focus on designing intuitive and engaging user interfaces and experiences for a mobile application that integrates physical, psychological, and emotional well-being through AI and expert coaching.

• End-to-End Design Ownership: Responsible for the complete design lifecycle, from initial concept, screen and flow design, to the development of a comprehensive UI design system.

• Cross-Functional Collaboration: Work closely with the founding team and tech lead to drive the product vision and ensure design aligns with technical capabilities and business goals.

📝 Enhancement Note: The "Founding Member" status, combined with the "Equity" and "Co-Founder role" options, strongly suggests this is not a standard contractor position but rather a strategic hire for someone looking to invest significant expertise and potentially long-term commitment into a startup. The "AI Health" and "Holistic Health" focus indicates a need for empathetic and user-centric design within a sensitive domain.

📈 Primary Responsibilities

• Design and iterate on user interfaces, user flows, and individual components for the O App across both iOS and Android platforms.

• Architect and develop a comprehensive, scalable UI design system from its inception, ensuring consistency and efficiency in future design efforts.

• Collaborate closely and iteratively with the co-founders and the technical lead to translate product vision into tangible design solutions.

• Engage in rapid prototyping to test design concepts, gather user feedback, and refine designs based on insights, adhering to agile development principles.

• Contribute significantly to defining and implementing the app's visual identity, including color palettes, typography, and animation language, to create a cohesive brand experience.

• Actively participate in product strategy discussions, bringing a design-centric perspective to guide feature development and user experience enhancements.

📝 Enhancement Note: The responsibilities highlight a hands-on, strategic role. The emphasis on "developing a consistent UI design system from scratch" and "iterative design" points to a need for a designer who can establish foundational design principles and adapt quickly. Collaboration with founders and tech lead implies a need for strong communication and the ability to articulate design decisions.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong portfolio demonstrating practical application of design principles is paramount.

Experience: Proven practical experience in UI/UX design, with a portfolio showcasing mobile application design projects.

Required Skills:

• Demonstrated proficiency in UI/UX design, with a portfolio that clearly illustrates your design process and outcomes.

• Expertise in using Figma or similar industry-standard design and prototyping tools.

• A keen eye for creating clear, intuitive, and user-friendly interfaces, specifically optimized for mobile (iOS & Android).

• Strong aesthetic sensibility, with an appreciation for minimalist design, functionality, and visual appeal.

• Ability to work independently, take ownership of design tasks, and articulate the rationale behind design decisions.

Preferred Skills:

• Prior experience in the health tech, wellness, or mental health sectors.

• Experience in developing and maintaining design systems for mobile applications.

• Familiarity with animation principles and their application in UI design to enhance user engagement.

📝 Enhancement Note: The requirements emphasize practical skills and a strong portfolio over formal education. The explicit mention of "Gespür für klare, nutzerfreundliche Interfaces – besonders auf Mobile" and "Ein Blick für Ästhetik, Minimalismus und Funktionalität" indicates a preference for a designer who understands mobile-first principles and clean aesthetics. The "Interesse an Gesundheit, Wellness oder Mental Health" being a plus suggests that domain knowledge or passion will be highly valued.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Demonstration of Mobile App Design: Showcase at least 2-3 significant mobile app design projects (iOS or Android) that highlight your UI/UX capabilities.

• UI Design System Development: Include examples of how you've conceptualized, built, and maintained UI components and design systems, demonstrating scalability and consistency.

• Prototyping & User Flow Examples: Present interactive prototypes or detailed user flow diagrams that illustrate your ability to map out complex user journeys and test design hypotheses.

• Visual Identity Contribution: If possible, include examples where you've contributed to or defined visual identity elements like color palettes, typography, and iconography.

• Problem/Solution Articulation: For each project, clearly articulate the design problem, your approach, the solutions implemented, and the impact or results achieved.

Process Documentation:

• Ability to document design processes, component specifications, and user flow logic clearly for the development team.

• Experience in contributing to or defining agile design workflows, including rapid iteration and feedback integration.

• Understanding of how to gather and incorporate user feedback into the design process to drive continuous improvement.

📝 Enhancement Note: Given the role is a "Founding Member" and involves establishing design from scratch, the portfolio is critical. It needs to demonstrate not just aesthetic skill but also the strategic thinking required to build a scalable design foundation (design system) and the practical ability to execute on mobile platforms. The ability to articulate the "why" behind design choices is as important as the "what."

💵 Compensation & Benefits

Salary Range: As this is a Contractor role with potential equity and a negotiable payment, a specific salary range is not provided. However, for a mid-level to senior UI/UX Designer with founding member potential in Germany, a typical freelance rate could range from €50-€90 per hour, depending on experience and scope. Equity compensation can vary significantly but often involves a percentage of company shares, with vesting schedules.

Benefits:

• Founding Member Status: Be an integral part of the core team, influencing product direction and company culture from the outset.

• Equity/Company Shares: Opportunity for significant ownership in the company, aligning your success with the company's growth.

• Remote Work: Complete flexibility to work from anywhere in the world, fostering a global and diverse team environment.

• Flexible Work Arrangement: Adaptable working hours and scope (part-time/freelance) with a clear path towards full-time employment and potentially a Co-Founder role.

• High Impact and Purpose: Contribute to a meaningful mission focused on improving the health and well-being of millions through innovative AI and health technology.

• Agile & Hierarchyless Environment: Experience a fast-paced, dynamic startup culture with minimal bureaucracy and direct access to decision-makers.

Working Hours: Flexible, with an implied full-time equivalent of 40 hours per week for the contractor role, but adaptable based on agreement and project needs.

📝 Enhancement Note: The compensation structure is highly variable, emphasizing equity and flexibility. The "Founding Member" aspect implies a higher risk/reward scenario, where the potential long-term gains (equity, impact, role) outweigh a fixed, high salary. The "100% Remote" benefit is a significant draw for global talent.

🎯 Team & Company Context

🏢 Company Culture

Industry: Health Technology (Health Tech), AI, Mobile Applications, Wellness, Mental Health.

Company Size: Early-stage startup (implied by "Founding Member" and "small, ambitious, and fast team").

Founded: The company is in its early stages, aiming to build Germany's first holistic AI health app. The founding date is not specified, but the focus is on rapid development and market entry.

Team Structure:

• A small, highly ambitious, and fast-moving team with a clear vision.

• Flat hierarchy, emphasizing direct collaboration and minimal bureaucracy.

Methodology:

• Agile and iterative design and development processes.

• Emphasis on rapid prototyping, user feedback, and continuous improvement.

• Data-driven decision-making, particularly in understanding user needs and product performance.

• Focus on building a user-centric product that addresses holistic health needs.

Company Website: https://o-app.de

📝 Enhancement Note: The company culture is described as lean, fast-paced, and mission-driven. The "no hierarchy" and "small, ambitious team" suggest a highly collaborative environment where individual contributions have a significant impact. The health tech domain implies a culture of responsibility, empathy, and a strong purpose.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a "Founding Member" and "App Designer (UI/UX)," indicating a critical early-stage contribution. It sits at a mid-to-senior level in terms of design expertise required, but with significant potential for growth into leadership and strategic roles within the company's GTM and product development.

Reporting Structure: Direct collaboration with the Founders and Tech Lead. This is a highly collaborative structure with minimal formal layers, allowing for direct influence.

Operations Impact: The UI/UX Designer will have a direct and profound impact on the product's usability, adoption, and overall success. They will shape the user's first impression and ongoing experience, which is crucial for user retention and growth in a competitive app market, especially in the sensitive health sector. The design directly influences user engagement with AI features and coaching services.

Growth Opportunities:

• Product Leadership: As a founding member, there's an opportunity to grow into a Head of Product or Design Lead role as the company scales.

• Equity and Ownership: Significant growth potential through equity, as the company's valuation increases.

• Skill Specialization: Deepen expertise in AI health tech design, design systems, and mobile product strategy.

• Cross-Functional Development: Gain exposure to business strategy, marketing, and technical development within a startup context.

• Potential Co-Founder Role: A clear pathway exists for transitioning into a formal Co-Founder position.

📝 Enhancement Note: The "Founding Member" designation is key here. It implies accelerated growth potential, direct impact, and a stake in the company's future. The role is designed for individuals who want to build something significant and grow with it, rather than just execute tasks. The progression to Co-Founder is a substantial growth opportunity.

🌐 Work Environment

Office Type: This role is 100% remote, offering maximum flexibility in terms of location. While the company is based in Germany (Köln mentioned as a potential location), the work itself is location-independent.

Office Location(s): While the company has a presence in Germany (Köln), the role is fully remote and can be performed from anywhere globally.

Workspace Context:

• Global Collaboration: Work with a distributed team, requiring strong asynchronous communication skills and the use of digital collaboration tools.

• Technology Stack: Access to modern design and communication tools necessary for remote collaboration (e.g., Figma, Slack, project management software).

• Autonomy and Trust: The environment is built on trust and autonomy, expecting self-motivated individuals who can manage their time and deliverables effectively.

Work Schedule: Flexible hours are offered, accommodating different time zones and personal preferences. However, the expectation is to be available for key team syncs and deliver on project milestones, aligning with the needs of a fast-paced startup.

📝 Enhancement Note: The 100% remote nature is a defining characteristic. This requires a candidate who is comfortable with asynchronous communication, self-management, and contributing to a globally distributed team. The flexibility extends to working hours, but the "fast-paced startup" environment implies a need for responsiveness and dedication.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A review of your application, resume, and portfolio to assess core qualifications and alignment with the role.

• Portfolio Deep Dive: A detailed discussion focused on your portfolio, where you'll be asked to walk through key projects, explain your design process, and articulate the impact of your work.

• Founder/Team Interviews: Meetings with the founders and/or tech lead to discuss your experience, design philosophy, understanding of the health tech space, and cultural fit. This stage will likely involve discussing your vision for the app's design and potential contributions as a founding member.

• Practical Design Challenge (Potential): You might be asked to complete a small design exercise or case study relevant to the app's functionality to assess your problem-solving skills and design approach.

• Offer & Negotiation: Discussion of terms, including compensation (equity and payment), working hours, and the potential path to full-time/Co-Founder status.

Portfolio Review Tips:

• Highlight Mobile-First: Emphasize your experience with iOS and Android design principles.

• Showcase Design Systems: Clearly present any design systems you've built or contributed to, explaining their structure and benefits.

• Tell a Story: For each project, articulate the problem, your design process, the challenges faced, and the quantifiable (or qualitative) results. Focus on the "why" behind your design decisions.

• Demonstrate Iteration: Show how you incorporate feedback and iterate on designs to improve user experience.

• Visual Appeal & Clarity: Ensure your portfolio is well-organized, visually appealing, and easy to navigate.

Challenge Preparation:

• Research the company's mission, vision, and the competitive landscape of AI health apps.

• Be prepared to discuss your ideas for user engagement in health/wellness apps.

• Think about how to design for sensitive data and user trust.

• Consider how to create a cohesive visual identity for a new brand.

📝 Enhancement Note: The interview process will heavily weigh the portfolio and the candidate's ability to articulate their design thinking and strategic vision. Given the "Founding Member" aspect, expect questions that probe entrepreneurial spirit, ability to work autonomously, and alignment with the company's mission and values.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: Explicitly mentioned as a required tool for UI/UX design, wireframing, prototyping, and potentially design system management.

• Prototyping Tools: Proficiency in Figma's prototyping features is essential, with familiarity in other tools like Adobe XD or Sketch potentially beneficial.

Analytics & Reporting:

CRM & Automation:

• Not directly relevant to the UI/UX design role itself, but an understanding of how design integrates with user acquisition and retention funnels managed by CRM and marketing automation tools would be a plus.

📝 Enhancement Note: The primary focus is on Figma. Candidates should be able to demonstrate advanced proficiency in this tool, including its collaborative features and prototyping capabilities. Familiarity with broader product development tools and analytics platforms will enhance a candidate's profile.

👥 Team Culture & Values

Operations Values:

• Holistic Health & Well-being: A deep commitment to improving users' physical, mental, and emotional health.

• Innovation & AI: Embracing cutting-edge technology to solve real-world health challenges.

• User-Centricity: Designing with the user's needs, privacy, and well-being at the forefront.

• Entrepreneurship & Agility: A proactive, "can-do" attitude, embracing fast-paced development and taking ownership.

• Transparency & Collaboration: Open communication and teamwork within a flat, hierarchical structure.

• Purpose-Driven: A strong desire to create a product that makes a significant positive impact on society.

Collaboration Style:

• Highly collaborative and iterative, with frequent feedback loops between design, founders, and tech.

• Emphasis on asynchronous communication due to the remote and global nature of the team.

• Open to constructive criticism and diverse perspectives to achieve the best design outcomes.

📝 Enhancement Note: The values are deeply intertwined with the mission of improving health. Candidates should demonstrate a genuine interest in this space and an alignment with the startup's agile, collaborative, and purpose-driven ethos. The "entrepreneurial spirit" is a core expectation.

⚡ Challenges & Growth Opportunities

Challenges:

• Establishing a Brand Identity: Creating a compelling and trustworthy visual identity for a new AI health app in a competitive market.

• Balancing Innovation with Usability: Designing intuitive interfaces for complex AI features and holistic health concepts that are accessible to a broad audience.

• Remote Collaboration Dynamics: Effectively collaborating and maintaining strong communication with a distributed team across different time zones.

• Early-Stage Startup Volatility: Navigating the inherent uncertainties and rapid changes of an early-stage startup environment.

• Data Privacy and Trust: Designing interfaces that ensure user privacy and build trust, especially when dealing with sensitive health data.

Learning & Development Opportunities:

• Deep Dive into Health Tech & AI: Gain specialized knowledge in designing for AI-driven health solutions.

• Design System Architecture: Master the principles and practices of building scalable design systems from the ground up.

• Startup Leadership: Develop entrepreneurial skills, product strategy, and potentially leadership capabilities.

• Global Team Management: Enhance skills in remote collaboration and managing diverse, distributed teams.

• Product Strategy: Contribute directly to defining the product roadmap and business strategy.

📝 Enhancement Note: The challenges are typical of early-stage startups, particularly in regulated or sensitive industries like health tech. These challenges also present significant growth opportunities for ambitious designers looking to expand their skill sets beyond pure design execution.

💡 Interview Preparation

Strategy Questions:

• "How would you approach designing a user onboarding flow for an AI health companion that needs to build trust immediately?"

• "Describe your process for developing a comprehensive UI design system for a mobile application. What are the key components and considerations?"

• "Imagine we need to integrate a new AI feature for mood tracking. How would you design the user experience to be both insightful and non-intrusive?"

Company & Culture Questions:

• "What interests you most about O App's mission to build a holistic AI health app?"

• "How do you approach working in a fast-paced, remote startup environment with a flat hierarchy?"

• "Describe a time you had to make a difficult design decision with limited information or conflicting stakeholder opinions."

Portfolio Presentation Strategy:

• Structure Your Narrative: For each project, clearly state the problem, your role, your design process, key decisions, and the outcome/impact.

• Focus on Mobile & Design Systems: Highlight your mobile design expertise and any experience with design systems.

• Show, Don't Just Tell: Use visuals, interactive prototypes, and clear explanations to demonstrate your skills.

• Articulate Your 'Why': Be prepared to defend your design choices and explain the rationale behind them.

• Connect to O App: Frame your experience and ideas in the context of O App's mission and product.

📝 Enhancement Note: Expect questions that assess not only design skills but also strategic thinking, problem-solving abilities, entrepreneurial mindset, and cultural fit. The portfolio presentation is a crucial part of the interview, so practice articulating your process and impact clearly.

📌 Application Steps

To apply for this App Designer (UI/UX) - Founding Member position:

• Submit your application through the provided link on join.com.

• Curate Your Portfolio: Ensure your portfolio prominently features your strongest mobile app design projects (iOS/Android) and any experience with design systems. Tailor your presentation to highlight relevant skills for a health tech startup.

• Craft Your Resume: Emphasize your practical UI/UX experience, proficiency with Figma, and any experience in health tech or with AI products. Clearly state your language proficiencies (German and English).

• Prepare Your Narrative: Be ready to articulate your design process, your understanding of user-centric design for mobile, and your vision for the O App's user experience during interviews.

• Research O App: Thoroughly understand the company's mission, vision, and the holistic AI health market. Be prepared to discuss how your skills and passion align with their goals.

⚠️ 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.