Senior Product Designer (m/w/d)

🌐 We are on the mission to build Europe’s leading energy management platform to provide fair, clean energy to everyone. ⚡ We’re a diverse team of 50+ employees , with 46% being female and from 16+ nationalities , and steadily growing. Having raised of over €40 M in total, we are looking for passionate people to join us on our mission! 🚀 🇩🇪 Wir haben eine klare Mission: Wir bauen Europas führende Plattform für Energiemanagement, um faire und saubere Energie für alle zugänglich zu machen. ⚡ Unser Team ist vielfältig – wir sind über 50 Personen aus mehr als 16 Nationalitäten , mit einem Frauenanteil von 46 % . Und wir wachsen weiter! Mit über 40 Mio. € an Finanzierung suchen wir nach motivierten Menschen, die gemeinsam mit uns die Energiezukunft gestalten wollen. 🚀 Your Mission We are looking for a Senior Product Designer to help shape Ostrom’s next generation of consumer energy products. You will work across mobile app experiences, smart device integrations, tariffs, growth, and retention, translating complex energy logic into simple, trustworthy, and useful customer journeys. You will be part of the core Product team and work closely with Product Managers, Engineering, Marketing, and Operations. Beyond designing individual features, you will help mature our design practice, mentor another product designer and play a crucial role in defining, prioritizing, and delivering quality experiences that align with our overall mission of build Europe’s leading energy management platform to provide fair, clean energy to everyone. What you will be keeping busy with Design Ownership: Own the end-to-end product design process, from problem and solution discovery (in tandem with your Product Manager), to wireframing and prototyping, to producing impact-driving and delightful designs that are ready to be delivered by engineers, to defining success criteria and monitoring after launch. Complex UX Simplification : Translate complex energy products such as tariffs, smart devices, automation, and optimisation into simple, trustworthy customer experiences. Collaboration & Stakeholder Management: Collaborate closely with Product Managers, the tech team, and stakeholders to define requirements, facilitate workshops, iterate on solutions, and deliver designs that align with business & customer goals, and that balance design quality and timely delivery. Strategy & Roadmap Development: Support product managers and relevant stakeholders to develop and maintain a prioritised product roadmap that maintains a high bar for design and user experience, ensuring continual alignment with business objectives. Design Leadership & Processes: Maintain and elevate ongoing design processes and artefacts such as design systems, tooling, standards and trends, collaboration methods, educating and mentoring others in the product and tech teams on best practices. Mentoring & Design Practice: Mentor and support another product designer, provide thoughtful feedback, and help establish pragmatic design rituals, standards, and ways of working. Customer & Design Advocacy: Use user research, product metrics, usability testing, support feedback, and design expertise to become an internal expert and advocate on how customers think, what a good user experience means for them, and how we should reflect that in our product. Your profile: 4+ years of experience as a Product Designer, with clear ownership of complex mobile or web product experiences in ideally a fast-paced and dynamic startup/tech company. User-centric and naturally curious, knowing how to do user research, usability testing, and hypotheses validation, constantly wondering why users do what they do, with strong instincts on what makes a good user experience to delight customers. Strong understanding of UX principles, visual design, and interaction design, and loves to be on top of the latest market trends. Strong UI judgment: Design patterns, hierarchy, spacing, typography, accessibility, and overall interaction quality. Experience contributing to and improving design systems that ensure products are cohesive and consistent. Pragmatic and flexible, knowing when to accept 'good enough’ vs challenging the status quo. We pride ourselves on moving quickly but with confidence. Strong ability to simplify complex product logic, data, settings, and system states into clear user experiences. Strong ownership with excellent problem-solving skills, organisational skills, and attention to detail with experience working in an agile environments while collaborating with cross-functional teams. Great stakeholder management skills, including communication, alignment, and gathering and integrating feedback. We like to promote a culture of transparency. Strong command of English. We are a vibrant international team with English being our company-wide language. Nice to have: Experience working with B2C products that involve delightfully displaying of complicated data and settings like statistics and other data visualisation techniques. Experience with front-end development and software engineering. Experience with micro-animations and interaction styles Loves to play around using AI workflows Strong command of the German language. Many of our customers and much of our industry partners are German speaking so it'll be an advantage. Interview process Portfolio Review and Culture Fit Interview A conversation with the Product Lead to learn about your design craft and cultural fit. Take Home Case Study We will give you a take-home task (3-4 hours) to understand how you approach problems and design a simple mobile flow. Case Study Review and Product Collaboration Interview Presentation of your case, Q&A, and a conversation about product collaboration with the Product Lead and one of our Product Managers . Co-Founder Interview A final conversation to discuss alignment, culture, ownership, and your impact on Ostrom as a whole. Why us? Environmental Impact: Each customer who switches to Ostrom on average helps offset 1.5 tons of CO2 emissions per year compared to the average German energy mix. Flexibility : We offer a hybrid work model within Germany. You choose where you want to work and have an office in Berlin, Mitte. Stock options: On top of offering a competitive salary you will have access to company shares to ensure you can truly be part of the journey. Relocation package : We won't let distance get in the way, we offer visa and relocation support. Trust-based Team : A truly flat hierarchy and transparent company culture, where everyone’s voice matters. Benefits : An annual learning budget, company-pension scheme, company events, discounted USC membership, BVG public transport ticket, Lunch Benefit, Job Rad, e-Bike or e-Moped, Futurebens or monthly vouchers - the choice is yours. 🌐 About Us We’re Germany’s fastest-growing digital green energy provider and a Certified B Corp™ , driving the energy transition by making renewable energy more accessible and inclusive. How? Through variable tariffs, dynamic pricing, smart EV charging, heat pump and solar optimization, and Germany’s first virtual power plant: NeoGrid™. At Ostrom, you’ll work in a dynamic, open environment where you can be yourself, take on challenges, and grow both personally and professionally. 🌱Environmental Impact: Each customer who switches to Ostrom on average helps offset 1.5 tons of CO2 emissions per year compared to the average German energy mix. 📈 VSOP: On top of offering a competitive salary you will have access to company shares to ensure you can truly be part of the journey. 👭 Trust-based Team : A truly flat hierarchy and transparent company culture, where everyone’s voice matters. 💪🏽Benefits : An annual learning budget, company-pension scheme, company events, discounted gym membership, public transport ticket, e-bike or e-moped, Futurebens or monthly vouchers - the choice is yours. 💬 Stay In The Loop: We believe in transparent communication — from weekly town halls and quarterly updates to regular retrospectives. Got feedback or an idea? We’re all ears. 🤝 Work Together, Celebrate Together: We thrive on collaboration. Wins are shared and so are the celebrations from monthly happy hours to team trips and company events. 🌍 Work Your Way: Whether you prefer the office, your home desk, or a sunny spot in Sardinia — you work where you work best. 🚀 Learn By Doing: We grow together with personal development paths, learning budgets, and regular knowledge-sharing sessions. Try things out, learn along the way, and keep moving forward. 🇩🇪 Über Uns Wir sind der am schnellsten wachsende digitale Ökostromanbieter mit B Corp™ Zertifizierung in Deutschland – und treiben die Energiewende aktiv voran. Unser Ziel: Erneuerbare Energie für alle zugänglich und inklusiv machen. Wie? Mit variablen Tarifen, dynamischem Strompreis, Smart EV Charging, Optimierung von Wärmepumpen und Solaranlagen sowie Deutschlands erstem virtuellen Kraftwerk: NeoGrid™. Bei Ostrom arbeitest du in einem offenen, dynamischen Umfeld, in dem du du selbst sein kannst, Herausforderungen annimmst und dich kontinuierlich weiterentwickelst. 🌱 Nachhaltigkeit, die zählt: Mit deinem Wechsel zu Ostrom unterstützt du aktiv die Energiewende. Unsere Kund*innen helfen im Schnitt, jährlich 1,5 Tonnen CO₂ gegenüber dem deutschen Durchschnittsstrommix einzusparen. 📈 Wertschätzung, die sich auszahlt: Neben einem attraktiven Gehalt erhältst du bei uns VSOPs – Unternehmensanteile, mit denen du direkt am Erfolg von Ostrom beteiligt bist. 👭 Teamkultur auf Augenhöhe: Bei Ostrom leben wir flache Hierarchien und eine offene Feedbackkultur. Deine Meinung zählt – vom ersten Tag an. 💪🏽 Benefits: Du erhältst ein flexibles Paket mit vielen Extras – von einem jährlichen Weiterbildungsbudget, über eine betriebliche Altersvorsorge, bis hin zu vergünstigten Fitnessstudio-Mitgliedschaften, einem Jobticket oder deinem eigenen E-Bike bzw. E-Roller. Alternativ wählst du monatliche Gutscheine oder FutureBens – du entscheidest, was dir wichtig ist. 💬 Transparenz: Ob in wöchentlichen Townhalls, vierteljährlichen Updates oder offenen Retrospektiven – wir glauben an klare Kommunikation und kontinuierlichen Austausch. 🤝 Erfolge feiern wir gemeinsam: Teamarbeit steht bei uns im Mittelpunkt – und genauso feiern wir auch unsere Erfolge: mit regelmäßigen Happy Hours, Team-Ausflügen und unvergesslichen Company Events. 🌍 Work you way: Ob im Berliner Büro, im Homeoffice oder remote unter der Sonne – bei uns arbeitest du dort, wo du am produktivsten bist. 🚀 Wachse mit uns: Persönliche Entwicklung ist bei Ostrom keine Floskel. Wir unterstützen dich mit Lernbudgets und Raum zum Ausprobieren – damit du dich fachlich und persönlich kontinuierlich weiterentwickeln kannst.