Mobile Developer & UI/UX Product Designer (m/w/d)

📍 Job Overview

Job Title: Mobile Developer & UI/UX Product Designer (m/w/d)

Company: Liotec GmbH

Location: Berlin, Germany

Job Type: Full-time

Category: Mobile Development & Product Design

Date Posted: 2026-08-25

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

Remote Status: Hybrid

🚀 Role Summary

• Drive the continuous development and expansion of native iOS and Android applications using Swift/SwiftUI and Kotlin/Jetpack Compose.

• Actively shape the user experience and intuitive navigation of the Value app through UI/UX design, flow conception, and prototyping.

• Contribute significantly to the product development lifecycle, from ideation and conceptualization to technical implementation and feature enhancement.

• Leverage AI tools for development tasks (coding, refactoring, debugging, prototyping) while maintaining strong independent coding, understanding, and critical assessment skills.

• Collaborate closely with founders and team members in a dynamic startup environment to translate user needs into effective digital product solutions.

📝 Enhancement Note: This role uniquely blends deep technical mobile development expertise with a strong product design and strategic product development focus. The emphasis on AI integration, hybrid work, and direct product impact suggests a forward-thinking startup environment that values holistic contributions. The "m/w/d" designation is standard in Germany, indicating the role is open to all genders.

📈 Primary Responsibilities

• Mobile Development:

  • Advance the ongoing development and feature expansion of the Value app for both iOS and Android platforms.
  • Implement native applications using Swift/SwiftUI for iOS and Kotlin/Jetpack Compose for Android.
  • Design and technically implement user-centric, innovative features across both mobile platforms.
  • Write clean, maintainable, and well-tested code, actively contributing to the evolution of the technical architecture.
  • Integrate with REST APIs to support the technical implementation of new product functionalities.
  • Experiment with new technologies and collaboratively solve complex technical challenges.

• UI/UX & Product Design:

  • Continuously enhance the user experience of the app, maintaining a strong user-centric perspective.
  • Conceptualize and design user flows, screens, and interactions.
  • Critically evaluate existing features and identify areas for improvement.
  • Translate ideas and requirements into tangible product solutions in collaboration with the team.
  • Develop prototypes and UI concepts, then implement them directly within the app.
  • Ensure a consistent and intuitive user experience across both iOS and Android.
  • Question the "why" behind feature development, not just the "how."

• Product Development:

  • Actively contribute personal ideas and influence the future direction and evolution of the Value product.
  • Foster close collaboration with founders, the development team, and other team members.
  • Challenge existing solutions and co-develop new strategies and features.
  • Guide product ideas from initial conception through to final implementation.
  • Participate in user research and analysis to understand user needs and inform product development.

• AI Integration:

  • Proactively use AI tools in daily workflows for development, refactoring, debugging, testing, and ideation.

  • Understand the functionality and reasoning behind AI-generated code.

  • Independently write, comprehend, debug, and critically evaluate code, whether AI-assisted or not.

📝 Enhancement Note: The responsibilities clearly indicate a dual role requiring proficiency in both native mobile development and UI/UX design. The strong emphasis on product development and AI integration suggests a role that is highly collaborative and forward-looking, moving beyond traditional developer tasks to encompass strategic product input.

🎓 Skills & Qualifications

Education: Specific educational background or degree is not a primary requirement; demonstrable skills and thinking are prioritized.

Experience: Mid-level experience (typically 2-5 years) is expected, with a strong portfolio showcasing practical application of skills.

Required Skills:

• Passion for native iOS development in Swift and Android development in Kotlin.

• Relevant experience with SwiftUI and Jetpack Compose.

• Strong understanding of UI, UX principles, and intuitive user guidance.

• Proficient in agile development methodologies, Clean Code principles, MVVM, and Dependency Injection.

• Good knowledge of automated testing (UI and Unit Tests) and quality assurance practices.

• Experience working with REST APIs.

• Genuine interest in building high-quality products.

• Proactive attitude towards contributing ideas, taking responsibility, and co-shaping decisions.

• Comfortable using AI tools for development tasks, but capable of independent coding and critical evaluation.

• Aptitude for solving complex problems and transforming them into simple, intuitive solutions. Preferred Skills:

• Experience with UI/UX design, prototyping, or design tools such as Figma.

• Experience in product development or product management.

• Familiarity with continuous integration/continuous deployment (CI/CD) pipelines.

• Experience working in a startup environment.

📝 Enhancement Note: The emphasis on practical skills over formal education is a common trait in dynamic startup environments. The explicit mention of both Swift/SwiftUI and Kotlin/Jetpack Compose indicates a need for versatility or a willingness to work across both platforms, potentially with a focus on one initially. The blend of technical and design skills, alongside product thinking and AI proficiency, defines the core competency profile.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase of native iOS and Android applications developed, highlighting technical complexity and user experience.

• Demonstrations of UI/UX design work, including flows, screen designs, and interactive prototypes.

• Examples of contributions to product development, illustrating ideation, feature conceptualization, and implementation.

• Evidence of code quality, including clean code practices, test coverage, and architectural patterns (MVVM, Dependency Injection).

• Projects that demonstrate integration with REST APIs.

• Examples of how AI tools were utilized to enhance development or design processes.

• Case studies that detail the problem-solving process from initial idea to implemented solution. Process Documentation:

• Documentation of personal development workflow, including agile practices and testing methodologies.

• Examples of how UI/UX design processes were applied, from wireframing to final UI implementation.

• Description of how AI tools were integrated into the development lifecycle, detailing benefits and limitations.

• Explanation of how user feedback or needs were incorporated into product iterations.

📝 Enhancement Note: For a role blending development and design with a product focus, the portfolio should be a comprehensive showcase of end-to-end product creation. Emphasis should be placed on demonstrating how technical skills were applied to solve user problems and contribute to product strategy, not just isolated coding tasks. The inclusion of AI usage is a key differentiator.

💵 Compensation & Benefits

Salary Range: €55,000 - €60,000 per year.

Benefits:

• Genuine Creative Freedom: Actively shape the product and its future, not just implement features.

• Balanced Role: Approximately 50% Mobile Development and 50% UI/UX & Product Design, offering diverse tasks.

• Value-Driven Culture: Embodies the company's core values of appreciation, sustainability, and health.

• Top-Tier Equipment: High-quality setup provided, including a MacBook Pro and dual monitors, tailored to personal preference.

• Personal Development: Opportunities for continuous learning and a steep learning curve within the startup environment.

• Flexible Hybrid Model: Work 2-3 days per week from the Berlin office, with flexibility for personal exchange and on-site collaboration.

• Workation Opportunities: Potential for 1-2 months of working remotely from abroad after the onboarding period, subject to team and task compatibility.

• Motivated Team: Work with a highly motivated team where ideas are heard and implemented.

• Direct Impact: Opportunity to have a visible and immediate impact on the product and its customers.

Working Hours: Approximately 40 hours per week, with flexibility inherent in the hybrid and workation models.

📝 Enhancement Note: The provided salary range is competitive for mid-level mobile developers and UI/UX designers in Berlin, especially within a startup context. The benefits package highlights a strong emphasis on work-life balance, employee well-being, and professional growth, aligning with the company's stated values. The explicit mention of "Workation" is a significant perk for modern tech professionals.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology, specifically focused on developing innovative applications for improving workplace appreciation, sustainability, and health.

Company Size: Small to medium-sized startup, indicated by the "young startup" description and the collaborative, direct-impact nature of the role. This size allows for significant individual influence and a close-knit team dynamic.

Founded: The company is described as "young," suggesting a recent founding date, likely within the last few years, and is actively shaping its product and culture.

Team Structure:

• The team is small and highly collaborative, with direct access to founders.

• The role reports into a Product or Engineering lead, with close interaction across all team members.

• Cross-functional collaboration is central, with developers and designers working hand-in-hand on product features.

• Emphasis on shared ownership and collective decision-making. Methodology:

• Agile Development: Utilizes agile methodologies for iterative development and rapid response to feedback.

• User-Centric Design: Prioritizes understanding user needs and translating them into intuitive product experiences.

• Data-Driven Product Decisions: Although not explicitly stated, the focus on understanding user needs suggests a data-informed approach to product development.

• AI Integration: Actively incorporates AI tools into the development and design process.

Company Website: https://valueapp.de/

📝 Enhancement Note: Liotec GmbH, operating the Value app, positions itself as a forward-thinking startup aiming to revolutionize the workplace. The culture is likely fast-paced, innovative, and emphasizes shared responsibility and direct impact. The hybrid model and workation options suggest a modern approach to work flexibility.

📈 Career & Growth Analysis

Operations Career Level: This role sits at a mid-level, blending technical execution with product strategy. It's a crucial position for a growing startup, offering significant autonomy and the chance to influence product direction.

Reporting Structure: The role likely reports to a Head of Product, CTO, or a Lead Mobile Engineer. Direct interaction with founders is a key aspect, providing high visibility and direct feedback loops.

Operations Impact: The role has a direct and visible impact on the core product (Value app), influencing user acquisition, retention, and overall product success. Contributions are not just technical but also strategic, shaping the user experience and feature roadmap.

Growth Opportunities:

• Specialization: Deepen expertise in native iOS (SwiftUI) or Android (Jetpack Compose) development, or further specialize in UI/UX product design.

• Product Leadership: Transition towards a more senior product management or product owner role, leading feature development and strategy.

• Technical Leadership: Grow into a lead developer role, mentoring junior team members and contributing to architectural decisions.

• Cross-functional Expertise: Develop a strong understanding of business strategy, marketing, and user acquisition through close collaboration with founders.

• Startup Growth: Benefit from the rapid growth trajectory of a startup, potentially taking on broader responsibilities as the company scales.

📝 Enhancement Note: The hybrid nature of the role (dev + design + product) offers diverse growth paths. The startup environment inherently provides opportunities for rapid learning and advancement, especially for individuals who demonstrate initiative and a strong product mindset.

🌐 Work Environment

Office Type: A modern office space in Berlin designed to foster collaboration and provide a comfortable working environment. The company emphasizes the value of in-person interaction.

Office Location(s): Berlin, Germany. Specific details about the office amenities or accessibility would be available upon inquiry or during a site visit.

Workspace Context:

• Collaborative Hub: The office serves as a central point for team meetings, brainstorming sessions, and focused collaboration, especially for the 2-3 days per week requirement.

• Modern Tech Stack: Access to high-end equipment (MacBook Pro, dual monitors) ensures a productive and efficient work experience.

• Team Interaction: Opportunities for spontaneous discussions, knowledge sharing, and team-building activities during in-office days.

Work Schedule: A standard 40-hour work week is implied, with significant flexibility. The hybrid model allows for a balance between remote work and in-office collaboration. The "Workation" policy further enhances flexibility for longer periods, provided tasks and team coordination are managed effectively.

📝 Enhancement Note: The hybrid model is clearly defined as 2-3 days in the Berlin office, indicating a structured approach to in-person collaboration while retaining remote flexibility. The company's emphasis on personal exchange suggests the office environment is designed to be engaging and productive for those days.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Application: Submit resume and a few sentences on motivation to Alexander Hubov.

• Personal Conversation: The primary focus is on a personal conversation to understand the candidate's thinking, passion, and potential fit with the team and product vision.

• Technical/Design Assessment (Implied): While not explicitly detailed, expect discussions or practical exercises that assess your mobile development skills (Swift/Kotlin, SwiftUI/Jetpack Compose), UI/UX design sensibilities, and product thinking. This might involve reviewing your portfolio or discussing specific technical/design challenges.

• Product Strategy Discussion: Engage in conversations about product ideas, user needs, and how you would approach feature development and improvement.

• AI Tool Integration Discussion: Be prepared to discuss your experience and approach to using AI tools in development and design.

• Cultural Fit: Assess alignment with the company's values of appreciation, sustainability, health, and the overall startup culture.

Portfolio Review Tips:

• Curate Selectively: Showcase your strongest projects that best represent your skills in native mobile development (iOS/Android), UI/UX design, and product development.

• Highlight Impact: For each project, clearly articulate the problem you solved, your specific contributions, the technologies used, and the outcome or impact. Quantify results where possible.

• Showcase Both Sides: Ensure your portfolio demonstrates proficiency in both the technical development aspects (code quality, architecture) and the design aspects (user flows, UI aesthetics, usability).

• Explain Your Process: Be ready to walk through your design and development process for key projects, explaining your rationale and decisions.

• AI Integration Examples: If possible, include projects where you leveraged AI tools and explain how they enhanced your workflow or the final product.

• Conciseness: While thoroughness is key, be concise in your explanations. The "few sentences on motivation" suggests a preference for direct communication.

Challenge Preparation:

• Product Thinking: Practice articulating how you would approach developing a new feature for the Value app or improving an existing one, considering user needs and business goals.

• Technical Problem Solving: Be ready to discuss common mobile development challenges, debugging strategies, and best practices for code quality and testing.

• Design Thinking: Prepare to discuss your approach to user research, wireframing, prototyping, and creating intuitive user interfaces.

• AI Tool Application: Think about specific scenarios where AI tools could accelerate development or design, and how you would critically evaluate their output.

📝 Enhancement Note: The emphasis on a "personal conversation" and "few sentences on motivation" suggests that Liotec GmbH values personality and cultural fit highly, potentially more than a traditional, lengthy application process. The portfolio is critical for demonstrating tangible skills.

🛠 Tools & Technology Stack

Primary Tools:

• Mobile Development: Swift, SwiftUI (iOS), Kotlin, Jetpack Compose (Android).

• Design & Prototyping: Figma (preferred, or similar UI/UX design tools).

• API Integration: REST APIs.

• AI-Assisted Development: Various AI coding assistants and tools (e.g., GitHub Copilot, ChatGPT for code generation/refactoring).

Analytics & Reporting:

• While not explicitly mentioned, expect to work with mobile analytics platforms (e.g., Firebase Analytics, Amplitude) to track user behavior and app performance.

• Tools for monitoring app performance and crash reporting. CRM & Automation:

• Not directly relevant to this role's core technical responsibilities but will likely interact with product management tools (e.g., Jira, Trello, Asana) for task management.

• Version control systems like Git are a standard expectation.

📝 Enhancement Note: The tech stack is modern and aligned with current best practices for native mobile development and UI/UX design. The explicit mention of SwiftUI and Jetpack Compose indicates a focus on declarative UI frameworks, which are industry-leading. The integration of AI tools is a key differentiator.

👥 Team Culture & Values

Operations Values:

• Appreciation: Fosters a culture where contributions are recognized and valued, mirroring the app's mission.

• Sustainability: Integrates sustainable practices and thinking into company operations and product development.

• Health: Promotes employee well-being and a healthy work-life balance.

• Innovation: Encourages experimentation, new ideas, and the adoption of modern technologies (like AI).

• Ownership & Impact: Empowers individuals to take ownership of their work and see the direct impact of their contributions.

• Collaboration: Values teamwork, open communication, and mutual support.

Collaboration Style:

• Cross-Functional Integration: Developers, designers, and product individuals work closely together, breaking down traditional silos.

• Open Communication: Ideas and feedback are encouraged and actively sought through regular team interactions.

• Agile & Iterative: The team likely embraces a culture of continuous improvement, adapting quickly based on feedback and learnings.

• Mutual Respect: A supportive environment where diverse perspectives are welcomed and respected.

📝 Enhancement Note: The company actively lives by the values it promotes in its app, creating an authentic and purpose-driven work environment. This is a significant draw for candidates seeking roles with meaning and impact.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing Dual Roles: Effectively managing time and priorities between intensive mobile development and creative UI/UX product design tasks.

• Rapid Product Evolution: Keeping pace with the fast-paced development cycle of a startup, requiring adaptability and quick learning.

• AI Integration Nuances: Mastering the effective and ethical use of AI tools while ensuring code quality and independent technical understanding.

• Scalability: Contributing to a product that needs to scale rapidly, requiring robust architectural decisions and efficient coding practices.

• User Needs Interpretation: Accurately identifying and translating complex user needs into intuitive and effective product features.

Learning & Development Opportunities:

• Skill Deepening: Become an expert in SwiftUI and Jetpack Compose, mastering declarative UI frameworks for both platforms.

• Product Strategy Acumen: Gain in-depth experience in product development, from ideation and user research to roadmap planning and feature prioritization.

• AI Proficiency: Develop advanced skills in leveraging AI for software development and design, staying at the forefront of technological trends.

• Startup Operations: Learn firsthand about building and scaling a tech product and company.

• Cross-Functional Skills: Enhance collaboration and communication skills by working closely with founders and diverse team members.

📝 Enhancement Note: The challenges presented are typical of a high-impact role in a growing startup, offering significant opportunities for personal and professional growth. The focus on AI integration presents a unique learning curve and competitive advantage.

💡 Interview Preparation

Strategy Questions:

• "How would you approach designing a new feature for the Value app that enhances user appreciation in the workplace?" (Assesses product thinking, user empathy, and design approach).

• "Describe a complex mobile development challenge you faced, how you solved it, and what you learned. How would you use AI to assist in such a scenario?" (Evaluates technical problem-solving, debugging skills, and AI integration strategy).

• "Walk us through a project in your portfolio where you were responsible for both the technical implementation and the UI/UX design. What was your process and what was the outcome?" (Tests end-to-end capability and portfolio presentation).

• "How do you ensure code quality and maintainability, especially when working with AI-generated code?" (Focuses on technical rigor and critical evaluation of AI output).

• "What are your thoughts on the current landscape of AI in mobile development, and how do you see it evolving?" (Gauges industry awareness and forward-thinking). Company & Culture Questions:

• "Why are you interested in Liotec GmbH and the Value app specifically?" (Tests research and genuine interest).

• "How do you embody our company values of appreciation, sustainability, and health in your work?" (Assesses cultural alignment).

• "Describe your ideal hybrid work setup and how you ensure productivity and collaboration in both remote and office environments." (Evaluates understanding of hybrid work expectations).

• "What are your thoughts on the 'Workation' policy and how would you manage such an arrangement?" (Assesses flexibility and responsibility). Portfolio Presentation Strategy:

• Storytelling: Frame your portfolio projects as narratives – the problem, your solution (technical and design), the process, and the impact.

• Visuals: Use mockups, screenshots, and potentially short video demos to showcase the user experience and functionality of your work.

• Code Snippets: For development projects, be ready to share or discuss key code structures, architectural patterns, or challenging implementations.

• AI Integration: Clearly articulate where and how AI tools were used in your projects and what benefits they brought.

• Conciseness: Focus on the most impactful aspects of each project and be prepared to answer specific questions. Practice explaining your work clearly and concisely.

📝 Enhancement Note: The interview process seems to prioritize a holistic understanding of the candidate, focusing on their passion, problem-solving abilities, and cultural fit, alongside technical and design skills. Be prepared to discuss both the "how" and the "why" behind your work.

📌 Application Steps

To apply for this Mobile Developer & UI/UX Product Designer position:

• Submit your application through the provided link on join.com, including your resume and a few sentences articulating your motivation.

• Portfolio Preparation: Curate a portfolio that vividly demonstrates your native iOS and Android development skills (Swift/SwiftUI, Kotlin/Jetpack Compose), UI/UX design work (flows, prototypes, Figma examples), and product development contributions. Highlight projects where you leveraged AI tools.

• Resume Optimization: Ensure your resume clearly outlines your experience with the required technologies, agile methodologies, and your dual capability in development and design. Quantify achievements where possible.

• Interview Practice: Prepare to discuss your motivation, your approach to product development and design, your experience with AI tools, and your problem-solving strategies. Practice presenting your portfolio projects and articulating your contributions.

• Company Research: Familiarize yourself with the Value app (valueapp.de) and Liotec GmbH's mission, values, and culture. Understand how your skills and aspirations 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.