Senior Product / UX Designer

📍 Job Overview

Job Title: Senior Product / UX Designer

Company: GlassFlow

Location: Berlin, Germany

Job Type: FULL_TIME

Category: Product Design / UX Design

Date Posted: 2026-09-04

Experience Level: Mid-Senior Level (4+ years)

Remote Status: Hybrid

🚀 Role Summary

• Spearhead the design strategy and execution for GlassFlow's innovative AI agent data infrastructure products.

• Translate complex user needs and technical requirements into intuitive and effective user experiences for developers.

• Establish and mature the design function within an early-stage, high-growth tech startup environment.

• Collaborate directly with founders, CTO, and engineering teams to shape product direction and user-centric development.

📝 Enhancement Note: This role is positioned as the first design hire, implying a significant opportunity for the candidate to define and build the design framework from the ground up, including establishing design processes, standards, and potentially building a future design team. The focus on "data infrastructure for AI agents" and "developer tools" suggests a need for designers with experience in complex, technical B2B SaaS products.

📈 Primary Responsibilities

• Lead end-to-end product design, from user research and ideation through to high-fidelity prototyping and implementation support.

• Conduct comprehensive user research, including interviews, surveys, and usability testing, to deeply understand the needs of AI agent developers and data engineers.

• Develop user personas, sitemaps, user flows, and customer journey maps to articulate user experiences and identify key interaction points.

• Create wireframes, mockups, and high-fidelity interactive prototypes using Figma or comparable tools to visualize and iterate on design solutions.

• Advocate for user-centric design principles and best practices across the organization, ensuring the user voice is central to product development.

• Collaborate closely with the CTO and engineering team, providing clear design specifications and working iteratively to ensure design fidelity during development.

• Contribute to the overall product strategy by identifying opportunities for design innovation and user experience improvements.

• Define and maintain design systems and style guides to ensure consistency and scalability across GlassFlow's products.

📝 Enhancement Note: The responsibility to "lay the design foundations" and "bring the voice of the user to life" indicates a foundational role. The emphasis on collaboration with CTO and engineering, and the target audience being developers, strongly suggests a need for a designer comfortable with technical products and working in a fast-paced startup environment.

🎓 Skills & Qualifications

Education: While no specific degree is listed, a Bachelor's or Master's degree in Design, Human-Computer Interaction, Computer Science, or a related field is often preferred for senior roles in this domain. Equivalent practical experience will also be considered.

Experience: 4+ years of proven experience as a Product Designer or UX Designer, with a strong emphasis on B2B SaaS products, ideally within the developer tools or data infrastructure space.

Required Skills:

• Demonstrated expertise in user research methodologies, including conducting user interviews, usability testing, and synthesizing findings.

• Proficiency in design and prototyping tools, with a strong preference for Figma.

• Ability to translate complex technical concepts into clear, intuitive user interfaces and workflows.

• Strong understanding of information architecture, interaction design, and visual design principles.

• Experience in creating and iterating on wireframes, user flows, sitemaps, and high-fidelity prototypes.

• Excellent communication and interpersonal skills, with a proven ability to collaborate effectively with cross-functional teams, particularly software engineers and product managers.

• Experience working in fast-growing environments or early-stage startups, demonstrating adaptability and a proactive approach. Preferred Skills:

• Experience designing for developer tools, APIs, data platforms, or AI-related products.

• Familiarity with data engineering concepts and the challenges faced by developers in managing AI agent data.

• Knowledge of design systems and experience in establishing or contributing to them.

• Ability to articulate design decisions and rationale clearly to technical and non-technical stakeholders.

• A strong portfolio showcasing end-to-end product design process and successful product launches.

📝 Enhancement Note: The "4+ years of experience" combined with "first design hire" and "senior" title suggests they are looking for someone who can operate autonomously and strategically, not just execute tasks. Experience in developer tools is highly desirable, indicating a need for a designer who understands the target user's technical mindset and workflow.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• A robust portfolio demonstrating a strong command of the end-to-end product design process, from initial research to final design delivery.

• Case studies that clearly articulate design challenges, your role in solving them, the methodologies used (user research, wireframing, prototyping), and the impact of your design solutions.

• Examples of user research conducted, including methodologies, participant recruitment, and key insights derived.

• Visualizations of user flows, sitemaps, and customer journey maps that illustrate your understanding of user navigation and experience.

• High-fidelity mockups and interactive prototypes that showcase your UI design skills and ability to create engaging user interfaces.

• Evidence of collaboration with engineering teams and how you've translated designs into functional products. Process Documentation:

• Showcase your ability to define and document design processes, including user research protocols, design iteration cycles, and collaboration workflows with engineering.

• Provide examples of how you have contributed to or established design systems, ensuring consistency and scalability.

• Demonstrate how you measure the success of design initiatives, linking them to product goals and user satisfaction metrics.

📝 Enhancement Note: Given this is the first design hire, the portfolio should ideally highlight not just individual contributions but also instances where the candidate has influenced or established design processes, standards, or frameworks within a team or project. The emphasis on "developer tools" means showcasing how complex technical concepts were simplified for users.

💵 Compensation & Benefits

Salary Range: For a Senior Product/UX Designer in Berlin with 4+ years of experience in a tech startup, a competitive salary range would typically fall between €65,000 and €90,000 gross per year. This estimate considers the cost of living in Berlin, the seniority of the role, and the typical compensation for specialized tech roles in European startups.

Benefits:

• Competitive salary with Stock Option Grant: Reflects a commitment to employee ownership and long-term success.

• Real ownership: Competitive equity is a significant perk, aligning employee interests with company growth.

• Public transportation ticket in Berlin: Practical benefit for commuting in the city.

• Company credit card with a monthly allowance: For business expenses and potentially team events.

• Newest tech of your choosing: Empowers designers with the tools they need to be productive and creative.

• Annual Learning budget for personal development: Supports continuous skill enhancement and professional growth.

• Generous WFH policy and a budget for home office setup: Offers flexibility and ensures a comfortable remote work environment.

• The chance to build something that changes how the world streams data: A mission-driven aspect appealing to impactful roles.

• The opportunity to build for global tech brands from day one: Exposure to significant clientele.

• A career trajectory that will 10x your skills and network: Promises rapid professional development and networking.

Working Hours: A standard 40-hour work week is expected, typical for full-time roles in Germany. However, the "Generous WFH policy" suggests flexibility in how and when these hours are fulfilled, within reason and in coordination with team needs.

📝 Enhancement Note: The salary range is an estimate based on industry benchmarks for senior UX/Product Designers in Berlin. Actual compensation will depend on the candidate's specific experience, skills, and negotiation. The "Stock Option Grant" and "Competitive equity" are highlighted as significant components of the total compensation package, common in early-stage startups.

🎯 Team & Company Context

🏢 Company Culture

Industry: Data Infrastructure, AI Agents, Developer Tools, SaaS. GlassFlow operates at the intersection of cutting-edge AI technology and foundational data infrastructure, serving a critical need for developers building and deploying AI agents in production.

Company Size: Early-stage startup (implied by "first design hire," "small team," and recent funding round). This means a dynamic, fast-paced environment where individual contributions have a substantial impact.

Founded: The company was founded by serial entrepreneurs with over 10 years of experience in building and selling data products, bringing a wealth of domain expertise and a proven track record to the venture.

Team Structure:

• A small, agile team consisting of founders, a CTO, engineers, and now the first design hire. This structure fosters direct collaboration and rapid decision-making.

• The design role reports directly to the CTO or a founder, ensuring close alignment with product vision and technical execution.

• High degree of cross-functional collaboration is expected, particularly between design, engineering, and product leadership. Methodology:

• Data-driven approach to product development, leveraging user research and product analytics to inform decisions.

• Agile development methodologies are likely employed to facilitate rapid iteration and responsiveness to user feedback.

• Focus on building robust, scalable data infrastructure solutions for AI agents.

• Emphasis on a "Silicon Valley mentality" within a Berlin startup, suggesting a blend of ambitious goals, rapid execution, and a strong focus on innovation and technology.

Company Website: https://glassflow.ai

📝 Enhancement Note: The "Silicon Valley mentality" combined with being a Berlin startup suggests a culture that values ambition, speed, and innovation, while also benefiting from the European talent pool and quality of life. The small team size means individuals need to be adaptable and willing to wear multiple hats.

📈 Career & Growth Analysis

Operations Career Level: This role is for a Senior Product/UX Designer, indicating a level of autonomy, strategic thinking, and the ability to lead design initiatives. As the first design hire, it offers a unique opportunity to shape the design function and potentially grow into a Design Lead or Head of Design role as the company scales.

Reporting Structure: The Senior Product/UX Designer will likely report directly to the CTO or one of the co-founders, ensuring close proximity to product strategy and executive decision-making. This direct line provides high visibility and influence.

Operations Impact: The designer's work will directly influence the usability and adoption of GlassFlow's core products, which are foundational for AI agents in production. By creating intuitive developer tools, the designer will enable other companies to build and deploy AI more effectively, thus having a significant impact on the broader AI ecosystem and GlassFlow's market success.

Growth Opportunities:

• Leadership Development: As the first design hire, there's a clear path to leadership. As the company grows, this role could evolve into managing a design team, defining the hiring roadmap for designers, and setting the long-term vision for design at GlassFlow.

• Skill Expansion: Working with complex data infrastructure and AI agent technology will deepen expertise in a highly sought-after domain. Opportunities to learn about data engineering, AI concepts, and advanced developer tooling will be abundant.

• Strategic Influence: Direct collaboration with founders and the CTO provides unparalleled exposure to business strategy, fundraising, and product roadmap planning, accelerating professional growth and network development.

• Building from Scratch: The opportunity to define and build design processes, systems, and culture from the ground up is a rare and valuable experience for career advancement.

📝 Enhancement Note: The "career trajectory that will 10x your skills and network" suggests a high-growth environment where learning and development are prioritized. The "first design hire" aspect is a significant growth opportunity, offering a chance to build and lead.

🌐 Work Environment

Office Type: The job listing specifies "Berlin, Germany" and mentions a "Generous WFH policy," indicating a hybrid work environment. This means a mix of in-office collaboration and remote work flexibility.

Office Location(s): The primary office is located in Berlin, Germany. Specific details about the office space itself are not provided, but being a funded startup, it's likely to be a modern, functional workspace designed to foster collaboration.

Workspace Context:

• Collaborative Environment: The role requires close collaboration with engineering and product leadership, suggesting an open and communicative workspace, whether in the office or virtually.

• Tools and Technology: The company provides "Newest tech of your choosing," implying access to high-performance hardware and software necessary for design work.

• Team Interaction: With a small team, interaction will be frequent and direct, fostering a strong sense of camaraderie and shared purpose. The hybrid model allows for focused individual work and dedicated team collaboration sessions.

Work Schedule: A standard 40-hour work week is implied, with flexibility offered through the generous WFH policy. This allows designers to manage their time effectively, balancing deep work sessions with collaborative meetings and personal commitments.

📝 Enhancement Note: The hybrid model in Berlin is a significant draw, offering the benefits of a vibrant tech hub city while providing the flexibility desired by many professionals. The "newest tech" promise is crucial for a design role.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A brief call to assess basic qualifications, experience alignment, and cultural fit.

• Portfolio Review & Presentation: A dedicated session where you present your portfolio, walking through 1-2 key case studies. Be prepared to discuss your design process, decision-making, and the impact of your work.

• Technical/Design Challenge: Likely a take-home assignment or a live design exercise focused on a relevant problem GlassFlow might face, testing your problem-solving skills and design approach.

• Team/Stakeholder Interviews: Meetings with the CTO, engineering leads, and potentially founders to evaluate collaboration style, technical understanding, and strategic thinking.

• Final Interview: A concluding discussion, possibly with founders, to finalize the offer and discuss compensation and role expectations.

Portfolio Review Tips:

• Curate Strategically: Select 2-3 of your strongest case studies that best align with GlassFlow's needs (developer tools, complex data products, B2B SaaS).

• Tell a Story: For each case study, clearly articulate the problem, your role, the process, your decisions, the trade-offs, and the measurable outcomes.

• Showcase Process: Highlight your user research, ideation, wireframing, prototyping, and collaboration with engineers.

• Quantify Impact: Wherever possible, use data and metrics to demonstrate the success of your designs (e.g., increased user engagement, reduced task completion time, improved conversion rates).

• Figma Proficiency: Ensure your prototypes are well-executed and demonstrate your command of Figma.

• Address the "Why": Be ready to explain the rationale behind your design choices, especially when dealing with technical constraints or user needs in a developer tool context.

Challenge Preparation:

• Understand the Domain: Research GlassFlow's products (Tares, Rius) and the broader AI agent and data infrastructure landscape.

• Empathize with Developers: Consider the typical pain points and workflows of developers working with complex systems.

• Structure Your Approach: For a take-home challenge, clearly outline your process, assumptions, and deliverables. For a live exercise, think out loud and explain your thought process.

• Focus on User-Centricity: Even in technical challenges, anchor your solutions in user needs and business goals.

• Consider Scalability: Think about how your design solutions might scale as GlassFlow's products evolve.

📝 Enhancement Note: The "first design hire" aspect means the interview process will likely focus heavily on assessing the candidate's ability to operate independently, define processes, and contribute strategically. The portfolio review is critical for demonstrating this capability.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: Explicitly mentioned as a required proficiency for prototyping and design. This will be the core tool for UI/UX design, wireframing, and prototyping.

• User Research Tools: Depending on the methods employed, this could include tools for surveys (e.g., SurveyMonkey, Typeform), user interview platforms (e.g., Zoom, Google Meet), and potentially dedicated user research platforms (e.g., UserTesting.com, Maze).

• Prototyping Tools: While Figma is primary, familiarity with other prototyping tools (e.g., Adobe XD, Sketch) might be beneficial.

Analytics & Reporting:

• While not explicitly stated for the designer, familiarity with product analytics tools (e.g., Amplitude, Mixpanel, Google Analytics) is advantageous for understanding user behavior and measuring design impact. The designer will likely collaborate with engineers or product managers who use these tools.

• Dashboarding tools (e.g., Tableau, Looker) might be used to visualize product performance data, which can inform design decisions. CRM & Automation:

• Not directly relevant for the designer's day-to-day tools, but understanding how user feedback and product usage data are managed within CRM systems (e.g., Salesforce, HubSpot) or customer data platforms can provide context for user segmentation and targeted research.

• Automation tools are more relevant to engineering, but understanding how design elements integrate into automated workflows might be a plus.

📝 Enhancement Note: The emphasis on Figma is paramount. Beyond that, the designer should be comfortable working with data and collaborating with teams who use various analytics and potentially CRM tools to understand user behavior and product performance, which will inform design decisions.

👥 Team Culture & Values

Operations Values:

• User-Centricity: A core value, ensuring that user needs and experiences are at the forefront of all design and product decisions. This translates to a commitment to thorough user research and iterative design.

• Innovation & Ambition: Reflecting the "Silicon Valley mentality," there's a drive to build groundbreaking products that solve significant problems in the AI and data space. This encourages creative problem-solving and pushing technological boundaries.

• Collaboration & Transparency: Working in a small, agile team necessitates open communication, shared responsibility, and a willingness to provide and receive constructive feedback. Transparency in decision-making and progress is key.

• Data-Driven Decision Making: While design is creative, decisions will be grounded in user research data, product analytics, and business objectives. This ensures that design efforts are aligned with company goals and have measurable impact.

• Ownership & Accountability: As an early employee with equity, there's an expectation of taking ownership of responsibilities and being accountable for outcomes. This fosters a proactive and results-oriented mindset.

Collaboration Style:

• Direct and Agile: Expect frequent, informal communication and collaboration, especially with the CTO and engineering team. This allows for quick iteration and problem-solving.

• Cross-Functional Partnerships: The design role will be deeply integrated with engineering and product leadership, requiring a collaborative approach to define requirements, iterate on solutions, and ensure successful product launches.

• Feedback-Oriented: A culture where constructive feedback is welcomed and utilized to improve designs and processes. This will involve regular design reviews and open discussions.

• Knowledge Sharing: Encouraging the sharing of insights from user research, design best practices, and technical learnings to elevate the entire team's understanding and capabilities.

📝 Enhancement Note: The combination of a "Silicon Valley mentality" and a startup environment suggests a culture that is both ambitious and execution-focused. The emphasis on user-centricity and data-driven decisions is crucial for a designer aiming to make a significant impact.

⚡ Challenges & Growth Opportunities

Challenges:

• Establishing Design Foundations: As the first designer, you will be responsible for defining design processes, standards, and potentially a design system from scratch in a fast-paced startup. This requires strong organizational and strategic skills.

• Designing for Developers: Translating complex technical concepts into intuitive user experiences for a sophisticated user base (developers) can be challenging, requiring deep empathy and understanding of their workflows.

• Balancing Speed and Quality: The startup environment demands rapid iteration, which can sometimes conflict with the need for thorough research and meticulous design. Finding the right balance will be key.

• Scope and Ambiguity: Early-stage startups often have evolving requirements and a degree of ambiguity. The designer must be comfortable navigating this uncertainty and adapting to changes.

Learning & Development Opportunities:

• Deep Dive into AI & Data Infrastructure: Gain in-depth knowledge of the rapidly evolving fields of AI agents and data infrastructure, becoming an expert in a high-demand technical domain.

• Product Strategy & Leadership: Direct involvement in product strategy discussions with founders and CTO, offering unparalleled exposure to business decision-making and the potential to grow into a leadership role.

• Building a Design Function: The unique opportunity to shape and build the design function from its inception, influencing culture, processes, and future hiring.

• Industry Conferences & Training: Utilize the annual learning budget to attend relevant design or tech conferences, pursue certifications, or take specialized courses to stay ahead of industry trends.

📝 Enhancement Note: The challenges are framed as opportunities for growth. The ability to thrive in ambiguity and proactively build processes will be critical for success and advancement in this role.

💡 Interview Preparation

Strategy Questions:

• "How would you approach establishing design processes and standards as the first design hire at GlassFlow?" (Prepare to discuss your methodology for building a design function, including research, documentation, and collaboration frameworks.)

• "Describe a time you had to simplify a complex technical concept for a non-technical or technical audience through design. What was your approach and what was the outcome?" (Focus on your ability to empathize with user needs and translate technical requirements.)

• "GlassFlow's products are for developers. How would you ensure our design is intuitive and efficient for this user base, and what specific research methods would you employ?" (Demonstrate your understanding of developer tool design and user research techniques.) Company & Culture Questions:

• "What excites you about GlassFlow's mission and the opportunity to work on data infrastructure for AI agents?" (Show genuine interest in the company's vision and the problem space.)

• "How do you see yourself contributing to a fast-paced, early-stage startup culture?" (Highlight your adaptability, proactivity, and ability to thrive in dynamic environments.)

• "How do you handle feedback on your designs, especially from engineers or founders?" (Emphasize your collaborative spirit and openness to constructive criticism.) Portfolio Presentation Strategy:

• Focus on Impact: For each case study, clearly articulate the business problem and the measurable impact of your design solutions. Use data and metrics whenever possible.

• Demonstrate Process: Walk through your entire design process, from discovery and research to iteration and final delivery. Explain why you made certain decisions.

• Highlight Collaboration: Showcase how you worked with engineers and other stakeholders, and how you translated your designs into implemented features.

• Showcase Figma Mastery: Ensure your prototypes are interactive and well-designed, demonstrating your proficiency.

• Tailor to GlassFlow: Emphasize projects that involved complex B2B/SaaS products, developer tools, or data-intensive applications.

📝 Enhancement Note: The interview will likely assess not only design skills but also your strategic thinking, ability to operate independently, and cultural fit within a high-growth startup. Be prepared to discuss your process, rationale, and impact thoroughly.

📌 Application Steps

To apply for this Senior Product / UX Designer position at GlassFlow:

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

• Portfolio Customization: Ensure your portfolio is tailored to this role, highlighting 2-3 of your most relevant case studies (developer tools, B2B SaaS, complex data products). Clearly articulate your process, impact, and collaboration.

• Resume Optimization: Update your resume to emphasize your 4+ years of experience, proficiency in Figma, user research expertise, and experience in fast-paced or startup environments. Quantify achievements where possible.

• Interview Preparation: Practice presenting your portfolio and articulating your design process and decision-making. Prepare thoughtful questions for the interviewers about the role, team, and company vision.

• Company Research: Thoroughly research GlassFlow, its products (GlassFlow Tares and Rius), and the broader AI agent and data infrastructure market. Understand their mission and value proposition.

⚠️ 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.

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