Senior Product Designer

About the Job
Neptune Software is the AI execution layer for SAP. Enterprises are moving from software that records, to software that acts — AI agents running routine work while people govern the exceptions. What stands in the way isn't the models; it's that the logic agents need to act on is locked inside SAP. 
 
Neptune runs inside the customer's own landscape and makes that logic executable by AI: agent-ready context, governed tools, and applications where agents act under the customer's own authorizations, with guardrails enforced by the platform — not by the prompt. 
 
With Naia, our AI layer, teams build from natural language and deploy agents on ECC today that carry to S/4HANA unchanged, always at Clean Core. SAP-certified, 500+ enterprises, fifteen years in production: we are where core business systems learn to act.
 
As a Senior Product Designer at Neptune Software, you will play a central role in shaping the user experience of the Neptune DX Platform - the tool trusted by enterprises worldwide to build powerful business applications. You'll bridge the gap between complex technical capabilities and intuitive, elegant interfaces, working hand-in-hand with product managers and engineers to craft experiences that genuinely delight our customers. This is a hands-on role: you will be in the design files and in the code, building working prototypes yourself rather than handing off static specs.
 
Location
Remote - Spain
 
Responsibilities

• Own the end-to-end design process - from discovery and user research through wireframing, prototyping, and final UI delivery
• Build interactive, code-based prototypes yourself - using React, TypeScript, javascript, and AI-assisted tooling - to validate ideas fast and hand engineers something real
• Translate complex enterprise workflows and user needs into clear, intuitive, and visually compelling product experiences
• Collaborate closely with product managers and engineers to ensure designs are feasible, consistent, and aligned with business goals
• Conduct user interviews, usability tests, and competitor analyses to inform design decisions
• Maintain and evolve Neptune's design system, ensuring consistency across the platform
• Present and communicate design concepts to stakeholders, incorporating feedback iteratively
• Advocate for the end user throughout the product development lifecycle

Minimum Qualifications

• 5+ years of experience in product design or UI/UX design, ideally in a B2B or enterprise software environment
• Strong portfolio demonstrating end-to-end product design work across web or desktop applications
• Extensive hands-on experience with AI-assisted workflows - you have set up your own tooling (e.g. Claude, Cursor, Figma AI, MCP servers) and have clear ways of working that let you generate, prototype, and iterate at speed
• Solid understanding of UX principles, interaction design patterns, and accessibility standards
• Hands-on frontend development capabilities - working knowledge of HTML, CSS, TypeScript/JavaScript, and React, enough to build and ship your own interactive prototypes
• Experience working in agile, cross-functional product teams alongside engineers and PMs
• Strong communication skills with the ability to present and defend design decisions clearly

 Preferred Qualifications

• Experience designing for enterprise platforms, low-code/no-code tools, or developer-facing products
• Familiarity with design systems: building, maintaining, or contributing to one
• Deeper front-end proficiency - React component architecture, TypeScript, and modern design-system tooling - to contribute directly to the codebase alongside engineers
• Experience conducting user research and translating insights into actionable design improvements
• Exposure to the SAP ecosystem or similar enterprise software landscapes is a plus
• A collaborative mindset with a passion for mentoring peers and contributing to a design culture