Senior Product Designer (m/w/d)

📍 Job Overview

Job Title: Senior Product Designer (m/w/d)

Company: Ostrom

Location: Berlin, Germany

Job Type: FULL_TIME

Category: Product Design / UX/UI Design

Date Posted: May 21, 2026

Experience Level: 4+ Years

Remote Status: Fully Remote (within Germany)

🚀 Role Summary

• Lead the end-to-end product design process for Ostrom's consumer energy products, focusing on mobile app experiences, smart device integrations, and growth/retention initiatives.

• Translate complex energy logic and data into simple, trustworthy, and user-friendly customer journeys, ensuring a seamless user experience.

• Drive design leadership by mentoring another product designer, maturing the design practice, and actively contributing to the product roadmap and strategy.

• Collaborate closely with Product Managers, Engineering, Marketing, and Operations to define requirements, facilitate workshops, and deliver high-impact designs that align with business objectives and customer needs.

• Advocate for the customer by leveraging user research, product metrics, and usability testing to become an internal expert on user behavior and experience.

📝 Enhancement Note: While the role is titled Senior Product Designer, the responsibilities heavily emphasize leadership, mentorship, and strategic input into the product roadmap, suggesting a significant impact beyond individual feature design. The operations aspect comes into play through the need to simplify complex energy logic and integrate with backend operations for data and smart device functionalities.

📈 Primary Responsibilities

• Own the complete product design lifecycle, from problem and solution discovery through wireframing, prototyping, and final design delivery, including post-launch success monitoring.

• Simplify intricate energy-related products, including tariffs, smart device integrations, automation features, and optimization tools, into clear and intuitive customer experiences.

• Foster strong collaboration with Product Managers, the engineering team, and other stakeholders to define requirements, conduct workshops, iterate on solutions, and ensure timely delivery of high-quality designs.

• Support Product Managers and stakeholders in developing and maintaining a prioritized product roadmap that upholds a high standard for design and user experience, aligning with overarching business objectives.

• Maintain and enhance ongoing design processes, including design systems, tooling, standards, and collaboration methods, while educating and mentoring team members on best practices.

• Provide mentorship and constructive feedback to another product designer, helping to establish effective design rituals, standards, and workflows.

• Act as a customer and design advocate, utilizing user research, product metrics, usability testing, and support feedback to inform product decisions and champion user-centricity.

📝 Enhancement Note: The responsibilities highlight a blend of individual contribution and leadership, typical for a senior role. The emphasis on "complex energy products" and "smart device integrations" points to a need for designers who can bridge technical complexity with user needs, a key aspect of operations for a company like Ostrom.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong portfolio demonstrating mastery of design principles and practices is paramount. A background in Design, HCI, Computer Science, or a related field is often beneficial.

Experience: 4+ years of experience as a Product Designer, with a proven track record of owning complex mobile or web product experiences, ideally within a fast-paced startup or tech company.

Required Skills:

• User-centric approach with a natural curiosity for understanding user behavior and motivations.

• Proficiency in conducting user research, usability testing, and hypothesis validation.

• Strong understanding of UX principles, visual design, interaction design, and current market trends.

• Excellent UI judgment, with a keen eye for design patterns, hierarchy, spacing, typography, accessibility, and overall interaction quality.

• Experience contributing to and improving design systems to ensure product cohesion and consistency.

• Pragmatic and flexible mindset, capable of balancing speed with quality and knowing when "good enough" is sufficient or when to challenge the status quo.

• Proven ability to simplify complex product logic, data, settings, and system states into clear user experiences.

• Strong ownership with excellent problem-solving, organizational skills, and meticulous attention to detail.

• Experience working in agile environments and collaborating effectively with cross-functional teams.

• Strong stakeholder management skills, including effective communication, alignment, and feedback integration.

Preferred Skills:

• Experience with B2C products that involve displaying complex data and settings, such as statistics and other data visualization techniques.

• Familiarity with front-end development and software engineering principles.

• Experience with micro-animations and advanced interaction styles.

• Enthusiasm for leveraging AI workflows in design processes.

• Strong command of the German language.

📝 Enhancement Note: The requirement for 4+ years of experience and the emphasis on owning complex products and design systems indicate a need for a seasoned designer. The inclusion of "complex energy products" implies a need for a designer who can grasp and simplify intricate operational data and processes.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase end-to-end product design ownership for complex mobile or web applications, demonstrating the entire design process from discovery to delivery.

• Include detailed case studies of simplifying complex product logic, data, or system states into clear and intuitive user experiences.

• Feature examples of contributions to or creation of design systems, highlighting their impact on product consistency and efficiency.

• Demonstrate experience with user research, usability testing, and how these insights informed design decisions and improved user outcomes.

Process Documentation:

• Present case studies that clearly outline the problem, your approach, the solutions you designed, and the measurable impact of your work.

• Illustrate your collaboration process with Product Managers, Engineers, and other stakeholders, showing how you balanced feedback and delivered timely solutions.

• Detail how you leveraged design systems and maintained consistency across different product features or platforms.

• Explain your process for user research and validation, and how you translated findings into actionable design improvements.

📝 Enhancement Note: A strong portfolio is critical for this role, specifically highlighting the ability to translate complex operational data (energy logic, tariffs, device integrations) into user-friendly interfaces. The emphasis on design systems and end-to-end ownership suggests a need for a designer who understands the full product development lifecycle and can effectively document their process and impact.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for Senior Product Designers in Berlin, Germany, with 4+ years of experience in a tech/startup environment, a competitive salary range is estimated to be between €65,000 - €85,000 annually. This range accounts for the cost of living in Berlin, the seniority of the role, and Ostrom's positioning as a well-funded startup.

Benefits:

• Stock Options (VSOPs) providing ownership in the company's success.

• Relocation package and visa support for candidates moving to Germany.

• Annual learning budget for professional development.

• Company pension scheme.

• Company events and team-building activities.

• Discounted gym membership and public transport ticket.

• Various flexible benefits including Lunch Benefit, Job Rad (company bike program), e-Bike or e-Moped, Futurebens, or monthly vouchers, allowing personalized choices.

Working Hours: Standard full-time hours, estimated at 40 hours per week, with flexibility offered within a hybrid work model.

📝 Enhancement Note: The salary estimate is based on publicly available data for similar roles in Berlin, considering Ostrom's status as a well-funded startup. The extensive list of benefits provided by Ostrom is a significant draw for candidates and reflects a commitment to employee well-being and professional growth.

🎯 Team & Company Context

🏢 Company Culture

Industry: Renewable Energy / Green Technology / Energy Management Platform. Ostrom is a Certified B Corp™, indicating a strong commitment to social and environmental performance, accountability, and transparency. The company operates in a rapidly evolving, mission-driven sector focused on sustainability and the energy transition.

Company Size: 50+ employees. This size suggests a dynamic, agile environment where individuals can have a significant impact. It's large enough to have established processes but small enough to maintain a close-knit, collaborative culture.

Founded: Ostrom was founded with the mission to make renewable energy accessible and inclusive, driving the energy transition through innovative digital solutions. This mission is central to their identity and informs their culture.

Team Structure:

• The Product team is core to Ostrom's operations, working closely with Product Managers, Engineering, Marketing, and Operations.

• This Senior Product Designer will be part of the core Product team and will mentor another product designer.

Methodology:

• Ostrom utilizes agile methodologies for product development, emphasizing speed and continuous iteration.

• Data-driven decision-making is crucial, leveraging product metrics and user research to inform design and strategy.

• A strong focus on customer advocacy ensures that user needs and experiences are central to product development.

• Emphasis on process maturity and continuous improvement in design practices and tooling.

Company Website: https://www.ostrom.de/

📝 Enhancement Note: Ostrom's identity as a B Corp and its mission in renewable energy are key cultural drivers. The company size and flat hierarchy suggest an environment where direct impact and cross-functional collaboration are highly valued, which is beneficial for operations-focused roles that require integration across departments.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a Senior Product Designer, indicating a mid-to-senior level career stage. It requires not only strong individual design contributions but also leadership, mentorship, and strategic influence. The role is crucial for shaping the user experience of complex energy management products, directly impacting customer adoption and retention, which are key operational metrics.

Reporting Structure: The Senior Product Designer will report within the Product team, likely to a Head of Product or similar leadership role. They will also mentor another product designer, indicating a step towards leadership.

Operations Impact: The Senior Product Designer's work will directly influence customer acquisition, retention, and satisfaction by simplifying complex energy logic and product offerings. This simplification is critical for the operational efficiency of customer support and onboarding, and for driving adoption of Ostrom's unique energy solutions like dynamic pricing and virtual power plants.

Growth Opportunities:

• Leadership Development: Opportunity to lead design initiatives, mentor junior designers, and contribute to shaping the design practice and strategy within Ostrom.

• Skill Specialization: Deepen expertise in designing for complex data, B2C energy markets, and potentially smart device integrations and AI-driven workflows.

• Career Advancement: Potential to grow into a Lead Product Designer, Head of Design, or Product Management roles within Ostrom as the company scales.

• Industry Impact: Contribute to the growth of a mission-driven company in the renewable energy sector, making a tangible environmental impact.

📝 Enhancement Note: The role offers a clear path for growth beyond individual design work, with significant opportunities in leadership and strategic contribution. The emphasis on simplifying complex "energy logic" directly links design to operational effectiveness in a highly regulated and technical industry.

🌐 Work Environment

Office Type: Hybrid work model within Germany, with an office located in Berlin, Mitte. This offers flexibility for employees to choose their preferred work location while maintaining a central hub for collaboration and in-person interaction.

Office Location(s): Berlin, Germany (Mitte). This central location in a major European tech hub provides access to talent and resources.

Workspace Context:

• Collaborative Environment: The hybrid model encourages collaboration, with opportunities for in-person workshops and team events in the Berlin office.

• Tools & Technology: While not explicitly listed, it's expected that the design team will have access to modern design and prototyping tools (e.g., Figma, Sketch, Adobe Creative Suite) and collaboration platforms.

• Team Interaction: Regular interaction with Product Managers, Engineers, Marketing, and Operations teams is integral to the role, fostering a cross-functional and integrated work environment.

Work Schedule: Full-time (estimated 40 hours/week) with flexibility inherent in the hybrid model, allowing for efficient management of design processes and data analysis alongside personal commitments.

📝 Enhancement Note: The hybrid model and Berlin office location are attractive for designers seeking flexibility and a connection to a vibrant tech ecosystem. The emphasis on cross-functional collaboration is key for integrating design insights with operational realities.

📄 Application & Portfolio Review Process

Interview Process:

• Stage 1: Portfolio Review & Culture Fit Interview: A conversation with the Product Lead to assess design craft, experience, and alignment with Ostrom's values and culture. Be prepared to discuss your design philosophy and how you approach problem-solving.

• Stage 2: Take-Home Case Study: A practical exercise (3-4 hours) requiring you to design a simple mobile flow, demonstrating your approach to problem definition and solution design. Focus on clarity, user-centricity, and efficiency.

• Stage 3: Case Study Review & Product Collaboration Interview: Present your case study to the Product Lead and a Product Manager, followed by a Q&A session and a discussion on product collaboration. Showcase your ability to articulate design decisions and work effectively within a team.

• Stage 4: Co-Founder Interview: A final conversation with a Co-Founder to discuss overall alignment, cultural fit, ownership mentality, and your potential impact on Ostrom's mission and growth.

Portfolio Review Tips:

• Curate Strategically: Select 2-3 of your strongest projects that best showcase end-to-end ownership, complex problem-solving, and successful simplification of intricate logic. Prioritize projects that align with Ostrom's B2C energy management focus.

• Structure Case Studies: For each project, clearly outline the problem statement, your role and responsibilities, the design process (research, ideation, prototyping, testing), key decisions made, challenges overcome, and the measurable outcomes or impact.

• Highlight Operations Relevance: Emphasize how your designs addressed complex operational data or processes, simplified them for users, and contributed to business goals like customer acquisition, retention, or operational efficiency.

• Showcase Design Systems: If applicable, detail your experience with design systems, including how you contributed to their development, maintenance, and utilization to ensure consistency and scalability.

Challenge Preparation:

• Case Study Approach: Practice breaking down complex problems, identifying key user needs and business objectives, and outlining a structured design process. Focus on justifying your design decisions with user insights and business goals.

• Presentation Skills: Prepare a clear, concise, and engaging presentation of your case study. Be ready to answer in-depth questions about your process, rationale, and the impact of your work. Practice articulating your thought process and demonstrating your problem-solving skills.

• Stakeholder Collaboration: Be prepared to discuss how you manage feedback, collaborate with cross-functional teams, and balance competing priorities to deliver successful outcomes.

📝 Enhancement Note: The interview process is robust, with a strong emphasis on practical application (case study) and strategic thinking. The portfolio review is a critical early stage, requiring candidates to demonstrate their ability to translate complex operational realities into user-friendly designs.

🛠 Tools & Technology Stack

Primary Tools:

• Design & Prototyping: Figma is a highly probable primary tool given its industry prevalence and collaborative features. Other possibilities include Sketch, Adobe XD, InVision.

• Design Systems: Experience with building, maintaining, and utilizing design systems is essential. This includes understanding component libraries, style guides, and design tokens.

• User Research & Testing: Tools for conducting user interviews, surveys, and usability testing (e.g., UserTesting.com, Maze, Lookback).

Analytics & Reporting:

• Product Analytics: Familiarity with tools like Amplitude, Mixpanel, or Google Analytics for understanding user behavior and product adoption.

• Data Visualization: Ability to interpret and potentially design interfaces for data visualization, relevant for displaying complex energy data.

CRM & Automation:

• While not directly designing CRM systems, understanding how product design integrates with customer data and operational workflows is beneficial. Familiarity with how user journeys connect to backend operations and customer support systems is advantageous.

📝 Enhancement Note: While specific tools are not listed, the nature of the role and industry strongly suggests proficiency in modern design and prototyping tools like Figma, along with a deep understanding of design systems. The ability to work with data visualization and understand how design impacts operational metrics is key.

👥 Team Culture & Values

Operations Values:

• Sustainability & Environmental Impact: A core value driving the company's mission, encouraging designers to create solutions that promote renewable energy adoption and efficiency.

• User-Centricity: A deep commitment to understanding and serving the customer, translating complex "energy logic" into simple, trustworthy experiences.

• Transparency & Openness: Fostering an environment of open communication, feedback, and honest discussion, where everyone's voice is valued.

• Collaboration & Teamwork: Working together across departments to achieve common goals, with an emphasis on shared successes and mutual support.

• Agility & Pragmatism: Moving quickly and adapting to change, while maintaining a high bar for quality and user experience.

Collaboration Style:

• Cross-functional Integration: Close collaboration with Product Management, Engineering, Marketing, and Operations to ensure design solutions are technically feasible, strategically aligned, and meet business objectives.

• Feedback-Driven: An open culture of giving and receiving constructive feedback to continuously improve designs and processes.

• Knowledge Sharing: Encouraging the sharing of insights, best practices, and learnings across teams, particularly within the design and product development functions.

📝 Enhancement Note: Ostrom's values are deeply integrated with its mission and operational goals. The emphasis on transparency, collaboration, and user-centricity means that designers are expected to be strong communicators and team players who can translate complex operational necessities into user-friendly experiences.

⚡ Challenges & Growth Opportunities

Challenges:

• Simplifying Complex Energy Logic: The primary challenge will be translating intricate energy tariffs, smart device integrations, and dynamic pricing models into intuitive and trustworthy user experiences. This requires a deep understanding of the underlying operational systems.

• Balancing Speed and Quality: In a fast-paced startup environment, designers must effectively balance the need for rapid iteration with maintaining high standards for design quality and user experience.

• Data Visualization: Effectively presenting complex energy data, consumption patterns, and optimization insights in a clear and actionable manner for end-users.

• Mentorship: Effectively guiding and developing another product designer, while also managing individual design responsibilities.

Learning & Development Opportunities:

• Deep Dive into Energy Tech: Gain in-depth knowledge of the renewable energy sector, smart home technology, and energy management systems.

• Leadership and Mentorship: Develop leadership skills through mentoring and leading design initiatives.

• Advanced UX for Complex Data: Hone skills in designing for complex data sets and highly technical B2C products.

• Contribute to Design Practice: Play a key role in shaping and refining Ostrom's design processes, systems, and culture.

📝 Enhancement Note: The challenges are directly tied to the unique nature of Ostrom's business, emphasizing the need for a designer who can bridge technical complexity with user needs. The growth opportunities are substantial for someone looking to make a significant impact and grow their career in a mission-driven tech company.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you simplified a complex product or system for users. What was your process, and what was the outcome?" (Focus on energy-related complexity if possible).

• "How would you approach designing a feature that requires users to understand dynamic energy pricing?" (Showcase your understanding of user education and trust-building).

• "How do you balance the needs of Product Management, Engineering, and your own design vision when developing a new feature?" (Demonstrate stakeholder management and collaboration skills).

Company & Culture Questions:

• "What interests you about Ostrom's mission in renewable energy and our B Corp certification?" (Show your alignment with the company's values).

• "How do you approach mentoring other designers, and what are your expectations for a collaborative design team?" (Assess your leadership potential and teamwork skills).

Portfolio Presentation Strategy:

• Structure for Impact: For each case study, clearly articulate the problem, your specific role, your design process, key decisions, and the quantifiable results or impact. Use a narrative approach to guide the interviewers through your thought process.

• Highlight Operational Simplification: Explicitly point out how your designs addressed complex operational logic or data, making it accessible and manageable for the end-user. Use visuals to demonstrate the transformation.

• Emphasize Collaboration: Discuss your interactions with Product Managers, Engineers, and other stakeholders, showcasing how you incorporated feedback and navigated trade-offs.

• Quantify Achievements: Whenever possible, use metrics (e.g., increased conversion rates, reduced support tickets, improved user satisfaction scores) to demonstrate the success of your designs.

📝 Enhancement Note: Preparation should focus on understanding Ostrom's specific challenges in the energy sector and how design can solve them. The case study review is a critical component, requiring candidates to articulate their process and impact clearly.

📌 Application Steps

To apply for this Senior Product Designer position:

• Submit your application through the provided link on Ashby.

• Curate a Portfolio: Select 2-3 of your most relevant projects that showcase end-to-end design ownership, simplification of complex systems, and strong UI/UX capabilities. Ensure your portfolio clearly articulates your process, challenges, and the impact of your work.

• Tailor Your Resume: Highlight your 4+ years of experience, specific skills in UX/UI design, design systems, user research, and any experience with B2C products or complex data visualization. Quantify achievements where possible.

• Prepare for the Case Study: Familiarize yourself with Ostrom's products and mission. Practice approaching a design problem systematically, focusing on user needs, business goals, and clear, concise solutions.

• Research Ostrom: Understand their mission, values, and position in the energy market. Be ready to discuss why you are passionate about their work and how your skills align with their goals, particularly regarding simplifying energy management for consumers.

⚠️ 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.