Founding Product Designer

This isn’t your regular job. Keystone AI is a place where those who want to push harder can accelerate their careers faster than anywhere else. We’re aiming to become Germany’s second bootstrapped unicorn. Keystone AI is already Europe’s #3 fastest-growing company in 2025 (FT1000).
We are building the future of marketing by rewarding our community of over 70 million users for engaging with our advertisers’ products. We are offering a new way to acquire users for the biggest companies in the world.
FOUNDING PRODUCT DESIGNER
(€90K – €120K• Offers Equity)
At Keystone AI, you’ll:
– Own way more, way earlier — you’ll be trusted with responsibility fast.
– Push harder, get further — this isn’t a 9–5. We highly reward intensity.
– Join a rare environment — you will work with ambitious high-speed, high-ownership people.
– Fully present — we’re 5 days a week in the office to build the energising momentum we need.
We’re looking for a Founding Product Designer with exceptional visual and interaction design skills to join our team in Berlin. Reporting to the Head of Design, you’ll own end-to-end product experiences, shaping our design strategy and working closely with Product, Engineering, and Data Science. If you thrive in a fast-moving, iterative environment and are passionate about delivering high-quality, user-centric design, we’d love to hear from you.
KEY RESPONSIBILITIES 🎯
– Lead UI Design Process: Own the user interface design from concept to implementation, ensuring designs are visually compelling, intuitive, and aligned with user needs.
– Own the Design Process – Lead design from discovery to implementation, ensuring a balance of speed, quality, and impact.
– Collaborate Cross-Functionally – Work closely with Product, Engineering, and Data Science to align design with business goals and technical feasibility.
– Validate with Research – Conduct user research, usability testing, and data analysis to inform and refine design decisions.
– Communicate & Lead – Drive design critiques, stakeholder discussions, and alignment sessions, clearly articulating rationale behind decisions.
WHAT YOU’LL BRING 💡
– 5+ years of experience designing mobile-first products, with a strong portfolio showcasing impactful UI and UX work.
– Outstanding visual design skills, with a keen eye for detail, hierarchy, and accessibility.
– Strong communication & collaboration, effectively working across teams and presenting designs persuasively.
– Data-driven mindset, using research and analytics to guide decisions and measure success.
– Bonus: Experience with motion design and/or gamified elements.
WHAT MAKES YOU A STRONG FIT 🌟
– Strategic Thinking – You contribute beyond design, helping shape product direction and ensuring alignment with business objectives.
– Fast & Effective – You thrive in lean, iterative environments, balancing speed with quality.
– Technical Awareness – You understand front-end development (HTML, CSS, JavaScript) and how it impacts design decisions.
– Proactive & Impact-Driven – You take initiative, continuously pushing for better solutions, setting high standards, and driving improvements across the team.
WHY ALMEDIA? 🚀
– Own Our Growth: We offer all Berlin-based employees equity in Keystone AI to truly be a part of our success.
– Scale With Keystone AI: Grow alongside a startup that has been profitable from day one.
– Central Berlin Office: Work from a fully-stocked modern office built for collaboration, accessible from all around Berlin.
– Other Benefits: Transport subsidy, breakfasts and lunches, language learning, Urban Sports Club, and more.
We believe in fostering talent, evaluating all skill levels during the hiring process, and providing a clear path for growth. Keystone AI is an equal opportunity employer. We embrace and celebrate diversity, and encourage individuals from all backgrounds to apply.