UX/UI Designer (f/m/d)

📍 Job Overview

Job Title: UX/UI Designer (f/m/d)

Company: adjoe GmbH

Location: Hamburg, Germany

Job Type: Full-Time

Category: UX/UI Design, Product Design

Date Posted: November 4, 2025

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

Remote Status: Hybrid

🚀 Role Summary

• Drive user engagement, retention, and growth through the design of intuitive and user-centered digital experiences for mobile and web applications.

• Collaborate closely with product management and engineering teams to translate user needs and business objectives into compelling user interfaces and flows.

• Leverage data-driven design principles, including A/B testing and user research, to iteratively optimize and enhance user experiences.

• Contribute to and maintain a scalable and consistent Design System, ensuring brand coherence across all digital touchpoints.

📝 Enhancement Note: While the role is primarily UX/UI Design, its focus on driving engagement, retention, and growth, along with dashboard design for user behavior analysis, positions it within the broader Product Operations and Product Development ecosystem. The emphasis on A/B testing and measurable results directly impacts product performance and revenue optimization.

📈 Primary Responsibilities

• Develop and maintain a deep understanding of user needs, behaviors, and motivations through research and analysis.

• Design and develop intuitive, user-centered, and visually appealing interfaces for mobile (iOS/Android) and web applications.

• Collaborate with product managers, developers, and other stakeholders to conceptualize user flows, create wireframes, prototypes, and high-fidelity designs.

• Define key design hypotheses and work with product/data teams to set up and analyze A/B tests, iteratively optimizing designs based on measurable results.

• Conduct usability testing, user research, and analyze user feedback to validate and improve design decisions.

• Ensure consistency and coherence of design elements, styles, and branding across all digital touchpoints.

• Actively contribute to and maintain the internal Design System, ensuring scalability, consistency, and accessibility across all products.

• Stay up-to-date with the latest UX/UI design trends, tools, and technologies, and share knowledge with the team.

📝 Enhancement Note: The responsibility to "Define key design hypotheses and work with product/data teams to set up and analyze A/B tests" is a critical operations-focused aspect. It highlights the need for designers to not just create interfaces but to actively participate in the product iteration cycle, using data to inform and validate design decisions for measurable business impact.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong portfolio demonstrating practical application of UX/UI principles and methodologies is paramount. A degree in Design, Human-Computer Interaction, Psychology, or a related field is often beneficial.

Experience: 3+ years of professional experience in UX/UI design, with a significant focus on mobile (iOS and Android) and web applications.

Required Skills:

• Proven experience in UX/UI design for mobile and web applications.

• Proficiency in design and prototyping tools, specifically Figma, including the ability to create high-fidelity, interactive prototypes.

• Strong understanding of user-centered design principles, UX methodologies, and design thinking.

• Proven experience designing for mobile platforms (iOS and Android), with a solid grasp of platform-specific UI patterns and limitations.

• Demonstrated ability to communicate design ideas and decisions effectively with cross-functional teams.

• Strong Product Mindset: ability to balance user needs, technical constraints, and business objectives to define optimal product experiences.

Preferred Skills:

• Experience creating and/or specifying motion and micro-interactions using industry tools.

• Familiarity with Lottie (or similar formats like Bodymovin/After Effects) and Jitter (or similar rapid prototyping/animation tools).

• Experience contributing to or maintaining a Design System.

• Experience with conducting usability testing and user research.

• Familiarity with working in an agile development environment.

📝 Enhancement Note: The emphasis on "Product Mindset" and "balancing user needs, technical constraints, and business objectives" suggests that candidates with experience in product-led growth environments or those who can articulate how their designs directly contribute to business goals (like user acquisition, retention, or monetization) will be highly valued.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• A comprehensive portfolio showcasing a range of UX/UI design projects, with a clear emphasis on mobile and web applications.

• Demonstrate proficiency in Figma through interactive prototypes and high-fidelity mockups.

• Include case studies that clearly articulate the design process, from user research and problem definition to ideation, prototyping, testing, and final design.

• Showcase examples of how designs have been optimized based on user feedback, A/B testing results, or other data-driven insights, highlighting measurable improvements in user engagement or retention.

Process Documentation:

• Illustrate the user research methodologies employed, including user interviews, surveys, and persona development.

• Detail the wireframing and prototyping process, explaining the rationale behind key design decisions and user flows.

• Provide evidence of collaboration with development teams, showing how designs were translated into functional features and how technical constraints were addressed.

• Clearly present the outcomes of usability testing and A/B tests, including the data analyzed and the subsequent design iterations.

📝 Enhancement Note: The requirement to "Define key design hypotheses and work with product/data teams to set up and analyze A/B tests" implies that the portfolio should ideally include examples of how design decisions were validated through experimentation. Evidence of understanding and applying data to iterate on designs will significantly strengthen an application.

💵 Compensation & Benefits

Salary Range: For a UX/UI Designer with 3+ years of experience in Hamburg, Germany, the estimated annual salary range is typically between €55,000 and €75,000. This estimate is based on industry benchmarks for mid-level design roles in major German tech hubs, considering the company's growth phase and investment. Factors such as specific skills, portfolio strength, and interview performance can influence the final offer.

Benefits:

• Invest in Your Future: Access to regular feedback and a dedicated development program designed to support skill expansion and career goal achievement.

• Relocation Support: Assistance with visa processes and a relocation bonus to facilitate settling into Hamburg.

• Work-Life Balance: 30 vacation days annually, flexible working hours, and the option for 3 weeks of remote work per year.

• Health & Well-being: Free access to an in-house gym with various fitness classes and comprehensive mental health support through an Employee Assistance Program (EAP).

• Office Environment: Modern office with Alster Lake views, top-notch equipment, collaborative spaces, and complimentary snacks and drinks.

• Community & Events: Participation in regular team and company events, including hackathons and social gatherings.

Working Hours: The role operates on a standard full-time basis, likely around 40 hours per week, with flexible working hours to accommodate individual needs, including 3 core office days per week.

📝 Enhancement Note: The salary range is an estimation based on common compensation data for UX/UI Designers in Hamburg, Germany, with 3-5 years of experience. It accounts for the company's reported funding and growth stage. The benefits package is detailed, with specific mentions of support for international candidates (visa, relocation bonus), which is a significant draw for global talent.

🎯 Team & Company Context

🏢 Company Culture

Industry: Mobile Advertising Technology, AdTech, Mobile Apps, AI-driven Solutions. adjoe operates at the intersection of mobile app monetization and advertising, leveraging AI and first-party data to optimize the user experience and drive revenue for app publishers.

Company Size: adjoe is a growing company, likely employing between 250-500 employees globally, with significant investment backing. This size suggests a dynamic environment with opportunities for impact, balancing established processes with agility.

Founded: 2018. Founded relatively recently, adjoe is a modern tech company focused on innovation in the mobile ad space, characterized by rapid growth and a forward-thinking approach.

Team Structure: The UX/UI Designer will be part of the "Rewarded Solutions" team, which focuses on developing adjoe's rewarded engagement products. This team's tech stack includes native Android/iOS SDKs (Java/Kotlin, Swift) and customizable offerwall applications (React/TypeScript). The role reports to the Design Lead, indicating a structured design department with clear leadership. Collaboration is expected with product managers and developers.

Methodology: The team utilizes a blend of cutting-edge technology (AI, first-party data) and agile development practices. The UX/UI Designer will be instrumental in applying user-centered design principles, data analysis, and A/B testing to refine user experiences and product features. The internal Design System is a key component for ensuring consistency and scalability across products.

Company Website: https://adjoe.io/

📝 Enhancement Note: The company's focus on AI and data-driven solutions suggests a culture that values analytical thinking and measurable outcomes, even within creative roles like UX/UI design. The "Rewarded Solutions" team's tech stack indicates a robust engineering environment where design plays a crucial role in user adoption and engagement.

📈 Career & Growth Analysis

Operations Career Level: This is a Mid-Level to Senior-level position within the UX/UI Design function. The "3+ years of experience" requirement points towards an individual expected to work with a degree of autonomy, contribute significantly to design strategy, and mentor junior designers over time. The role's impact on user engagement, retention, and growth directly influences product success and, by extension, revenue operations.

Reporting Structure: The UX/UI Designer reports directly to the Design Lead. This implies a clear line of management and mentorship, with opportunities to learn from experienced design leadership. Collaboration will be extensive with Product Managers and Developers within the Rewarded Solutions team.

Operations Impact: The designer's work directly impacts user acquisition, engagement, and retention metrics, which are key performance indicators for both product and revenue operations. By optimizing user interfaces and experiences, the designer contributes to higher conversion rates for rewarded actions, increased user lifetime value, and ultimately, greater revenue generation for app publishers and adjoe. The design of dashboards for analyzing user behavior also provides critical operational insights.

Growth Opportunities:

• Skill Specialization: Deepen expertise in mobile UX/UI design, A/B testing, Design Systems, and potentially motion design.

• Leadership Potential: As experience grows, transition into a Senior UX/UI Designer role, leading design for specific product areas, or potentially moving into a Design Lead or Product Design Manager position.

• Cross-Functional Development: Gain deeper understanding of product management, data analysis, and engineering processes, fostering a holistic product development perspective.

• Industry Exposure: Work with cutting-edge AI technology and within the fast-paced AdTech industry, offering continuous learning and adaptation.

📝 Enhancement Note: The role is positioned as a significant contributor to product success, directly linking design output to business outcomes like engagement, retention, and revenue. This suggests strong potential for career advancement within Product Design or even Product Management for individuals who excel.

🌐 Work Environment

Office Type: The role is based in Hamburg, Germany, with a hybrid work arrangement. This typically means a modern, well-equipped office space designed to foster collaboration and creativity, complemented by remote work flexibility.

Office Location(s): The office is centrally located in Hamburg, offering views of the Alster Lake, and is equipped with top-notch technology and comfortable, engaging workspaces. Specific details about accessibility or proximity to public transport would be beneficial for candidates.

Workspace Context:

• The workspace is designed to be collaborative, with "fun open spaces" encouraging interaction. This environment is conducive to design thinking workshops and cross-functional brainstorming sessions.

• Top-notch equipment is provided, ensuring designers have the necessary tools to perform efficiently.

• Opportunities for interaction with the broader design, product, and engineering teams are abundant, facilitating knowledge sharing and team cohesion.

Work Schedule: The work schedule is flexible, with 3 core office days per week. This hybrid model allows for focused individual work at home and collaborative sessions in the office. The flexible hours provide autonomy in managing the workday, which is beneficial for creative roles requiring peak concentration.

📝 Enhancement Note: The hybrid setup with 3 core office days is a key aspect of the work environment, balancing the need for in-person collaboration and team building with the flexibility of remote work. This is a common arrangement in modern tech companies aiming to optimize productivity and employee satisfaction.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A review of the application, focusing on resume and portfolio. Candidates are asked to submit their portfolio upfront.

• Portfolio Review & Discussion: A deeper dive into the candidate's portfolio with the Design Lead or a senior designer, assessing design skills, process, and problem-solving abilities. Expect to discuss specific projects in detail, including design rationale, challenges faced, and outcomes.

• Technical/Design Challenge: Likely a practical exercise, such as a design critique, a small design task, or a take-home assignment, to evaluate design thinking, problem-solving skills, and proficiency with tools like Figma.

• Cross-Functional Interview: Meeting with Product Managers and Developers to assess collaboration style, communication skills, and ability to work within a team environment. Discussions may focus on how to balance user needs with technical feasibility and business goals.

• Final Interview: Potentially with a higher-level manager or head of department to discuss cultural fit, career aspirations, and overall alignment with adjoe's vision.

Portfolio Review Tips:

• Curate Strategically: Select 3-5 of your strongest projects that best showcase your UX/UI skills for mobile and web apps, with a preference for those demonstrating impact on engagement or retention.

• Tell a Story: For each project, clearly outline the problem statement, your role, the process you followed (research, ideation, prototyping, testing), the challenges you overcame, and the measurable results or impact achieved.

• Highlight Figma Proficiency: Ensure your prototypes are interactive and visually polished within Figma. Clearly articulate your design system contributions or usage.

• Showcase Data-Driven Design: If possible, include examples where your designs were informed by or led to A/B testing, user research findings, or other data analysis. Quantify the impact whenever feasible.

• Prepare for Questions: Be ready to discuss your design choices, trade-offs made, and how you handle feedback and constructive criticism.

Challenge Preparation:

• Understand the Product: Familiarize yourself with adjoe's products (offerwalls, Playtime, Arcade, adjoe Ads) and their target audience.

• Practice Design Critiques: Be prepared to analyze an existing interface and provide constructive feedback, focusing on UX principles and potential improvements.

• Problem-Solving Scenarios: Think about common UX challenges in mobile apps and ad tech, and how you would approach them.

• Communication: Practice articulating your thought process clearly and concisely, as if explaining your design decisions to both technical and non-technical stakeholders.

📝 Enhancement Note: The emphasis on a portfolio, A/B testing, and measurable results suggests that candidates should be prepared to demonstrate not just aesthetic design skills but also a strategic, data-informed approach to product development that drives tangible business outcomes.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: Essential for UI design, wireframing, prototyping, and collaboration. High-fidelity interactive prototypes are a key deliverable.

• Design System Tools: Familiarity with tools or processes for creating, maintaining, and scaling design systems.

• Prototyping & Animation Tools: Experience with Lottie, Bodymovin, After Effects, Jitter, or similar tools for motion and micro-interactions is a significant plus.

Analytics & Reporting:

• A/B Testing Platforms: Experience defining hypotheses and analyzing results from A/B tests is crucial for iterative design optimization.

• User Research Tools: Proficiency in conducting and analyzing usability tests, user interviews, and surveys.

• Analytics Dashboards: While not explicitly designing them, understanding how to interpret data from dashboards (likely provided by product/data teams) to inform design decisions is important.

CRM & Automation: Not directly part of the UX/UI designer's core toolset, but an understanding of how user data is managed and how automated user journeys function within the product ecosystem would be beneficial.

📝 Enhancement Note: Figma is the central design tool, but the mention of motion/animation tools and the expectation of defining and analyzing A/B tests highlight a need for designers who are not only skilled in static design but also in creating engaging user experiences and using data for optimization.

👥 Team Culture & Values

Operations Values:

• User-Centricity: A deep commitment to understanding and serving user needs, ensuring intuitive and engaging experiences.

• Data-Driven Decision Making: Utilizing analytics, A/B testing, and user feedback to inform and validate design choices, focusing on measurable impact.

• Collaboration & Transparency: Working closely with product, engineering, and other teams, fostering open communication and knowledge sharing.

• Innovation & Agility: Embracing new technologies and trends, and adapting quickly to market changes in the fast-paced AdTech industry.

• Excellence & Quality: Striving for high standards in design execution, consistency, and user experience across all products.

Collaboration Style:

• Cross-Functional Integration: Actively participating in discussions with product managers and developers to ensure design solutions are aligned with business objectives and technical feasibility.

• Feedback Loops: Embracing constructive criticism and actively seeking feedback from peers, stakeholders, and users to refine designs.

• Knowledge Sharing: Contributing to the team's collective expertise by sharing insights on design trends, tools, and best practices, particularly regarding the Design System.

📝 Enhancement Note: The company's emphasis on data-driven decision-making, combined with user-centricity and innovation, suggests a culture where designers are expected to be strategic contributors who can articulate the business value of their work.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing Competing Needs: Effectively balancing user desires, technical constraints, business objectives, and advertiser requirements within the AdTech ecosystem.

• Rapid Iteration: Adapting to a fast-paced environment that requires quick design iterations based on A/B test results and market feedback.

• Maintaining Design Consistency: Ensuring a cohesive user experience across multiple platforms (mobile apps, web) and product lines (rewarded solutions, programmatic ads) while contributing to a scalable Design System.

• User Engagement in AdTech: Designing experiences that are engaging and valuable to users, rather than perceived as intrusive advertising, is a perennial challenge in the AdTech space.

Learning & Development Opportunities:

• Advanced Design Skills: Opportunities to hone skills in interaction design, motion design, and advanced prototyping.

• Product Strategy Involvement: Deeper involvement in product strategy discussions, understanding how design contributes to overall business goals.

• Industry Expertise: Developing specialized knowledge in mobile advertising technology, AI applications in ads, and user behavior within app ecosystems.

• Mentorship: Learning from experienced Design Leads and collaborating with talented engineers and product managers.

📝 Enhancement Note: The challenges highlight the complex, multi-faceted nature of UX/UI design in the AdTech industry, where creativity must be coupled with analytical rigor and a strong understanding of business drivers.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you used A/B testing to optimize a design. What was your hypothesis, what were the results, and what did you learn?" (Focus on your role in hypothesis definition and result interpretation).

• "How do you balance user needs with business objectives and technical constraints when designing a new feature?" (Highlight your product mindset and problem-solving approach).

Company & Culture Questions:

• "What interests you about adjoe and our work in the mobile ad industry?" (Research adjoe's products and recent news).

• "How do you stay updated on UX/UI design trends, and how do you bring new ideas into your workflow?" (Showcase your passion for continuous learning).

Portfolio Presentation Strategy:

• Select Impactful Projects: Choose projects that best demonstrate your UX/UI process, problem-solving abilities, and measurable impact on user engagement or retention.

• Structure Your Narrative: For each project, clearly articulate the problem, your specific contributions, the steps you took, the tools you used, the challenges you faced, and the outcomes (quantified if possible).

• Highlight Figma & Design System Work: Be prepared to demo interactive prototypes in Figma and discuss your experience with design systems.

• Showcase Data-Driven Iterations: If you have examples of designs improved through user research or A/B testing, make them a focal point.

• Be Ready for Questions: Anticipate questions about your design choices, trade-offs, and how you handle feedback.

📝 Enhancement Note: Interviewers will likely probe your understanding of the AdTech landscape and how your design decisions contribute directly to key business metrics like engagement and revenue. Be prepared to discuss your experience with data-driven design and iterative optimization.

📌 Application Steps

To apply for this UX/UI Designer position:

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

• Portfolio Customization: Ensure your portfolio is easily accessible and highlights your most relevant UX/UI work for mobile and web applications, with a strong emphasis on Figma proficiency and demonstrable impact.

• Resume Optimization: Tailor your resume to emphasize your 3+ years of experience, specific skills in user-centered design, prototyping, and experience with A/B testing and user research. Use keywords from the job description.

• Prepare Your Narrative: Practice articulating your design process, project outcomes, and how you contribute to business goals. Be ready to discuss your portfolio in detail and explain your design rationale.

• Research adjoe: Understand adjoe's products (Playtime, Arcade, adjoe Ads), their AI-driven approach, and their position in the mobile advertising market. This will help you tailor your application and interview responses.

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