Senior Product Designer (m/w/d)

Ostrom GmbH

Job Overview

Location

Berlin / Remote

Job Type

Full-time

Full Job Description

📋 Description

• Own the end-to-end product design process for Ostrom’s consumer energy products, from problem discovery and solution ideation to wireframing, prototyping, and delivering high-fidelity designs ready for engineering implementation.
• Translate complex energy-related concepts — including tariffs, smart device integrations, automation, and optimization — into simple, intuitive, and trustworthy user experiences across mobile and web platforms.
• Collaborate closely with Product Managers, Engineering, Marketing, and Operations teams to define requirements, facilitate workshops, iterate on solutions, and align design outcomes with business and customer goals.
• Contribute to the development and evolution of Ostrom’s design system to ensure consistency, scalability, and cohesion across all digital products and touchpoints.
• Define success metrics for designed features and monitor post-launch performance using user research, product analytics, usability testing, and customer support feedback.
• Mentor and support another product designer by providing constructive feedback, establishing pragmatic design rituals, and promoting best practices in UX/UI design and collaboration.
• Advocate for the user by becoming an internal expert on customer behavior, needs, and pain points, using insights to influence product strategy and prioritize design improvements.
• Participate in shaping the product roadmap by helping prioritize initiatives that maintain a high bar for user experience and align with Ostrom’s mission of delivering fair, clean energy to everyone.
• Maintain awareness of emerging design trends, tools, and industry standards, and apply them pragmatically to balance innovation with timely delivery in a fast-paced startup environment.
• Simplify complex product logic, data visualizations, system states, and user settings into clear, accessible, and delightful interfaces that reduce cognitive load and increase user confidence.
• Demonstrate strong UI judgment through mastery of design patterns, visual hierarchy, spacing, typography, accessibility standards, and interaction quality across platforms.
• Work in an agile environment with cross-functional teams, managing multiple priorities while maintaining attention to detail and delivering high-quality outputs on schedule.
• Communicate design decisions clearly and persuasively to stakeholders, integrating feedback effectively while advocating for user-centered solutions.
• Contribute to a transparent, flat-hierarchy culture where every team member’s voice is valued and feedback is encouraged at all levels.
• Support company-wide initiatives around sustainability by designing experiences that help customers understand and maximize their environmental impact, including CO2 offset tracking and energy optimization insights.

🎯 Requirements

• 4+ years of experience as a Product Designer with clear ownership of complex mobile or web product experiences in a fast-paced startup or tech environment.
• Strong understanding of UX principles, visual design, interaction design, and user research methodologies including usability testing and hypothesis validation.
• Proven ability to simplify complex product logic, data, and system states into clear, intuitive user experiences.
• Experience contributing to and improving design systems to ensure product consistency and scalability.
• Strong stakeholder management skills with the ability to communicate, align, and integrate feedback across cross-functional teams.
• Strong command of English; ability to collaborate effectively in an international, English-speaking team.

🏖️ Benefits

• Access to company shares (VSOP) to be directly invested in Ostrom’s success.
• Hybrid work model with office in Berlin Mitte and full remote flexibility within Germany.
• Annual learning budget, company pension scheme, discounted gym membership, public transport ticket, e-bike or e-moped allowance, and flexible monthly vouchers or Futurebens.
• Relocation package including visa and relocation support for international candidates.
• Transparent, flat-hierarchy culture with weekly town halls, quarterly updates, and open feedback loops.
• Environmental impact: Each customer switch helps offset 1.5 tons of CO2 emissions annually.

Skills & Technologies

Design

Senior

Remote

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Ostrom GmbH

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About Ostrom GmbH

Ostrom GmbH supplies German households with 100 % renewable electricity under transparent, flexible monthly contracts. Through its digital platform, customers track real-time consumption, carbon savings and costs, while dynamic pricing reflects live market rates. The Berlin-based energy retailer integrates directly with smart-home devices and enables users to shift demand to cheaper, greener hours, reducing grid strain and personal bills. Founded in 2021, Ostrom operates without lock-ins or paper bills, managing metering, billing and support via a single mobile app and proprietary backend.

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