Saas Saas sales start-up startup cool young Munich Germany International VC VC backed growth vESOP ambitious scaleup scale-up Software Software Sales remote flexible Mindfuel people first perks Founder CEO Founding Account Product Management PM Product Manager Produkt Manager AI KI AI Product Senior Product Manager Senior Senior PM Technical Product Manager Produktmanagerin Spec-driven OpenSpec Requirements Engineering Product Discovery Claude AI-first Prompt Engineering Use Case Management Portfolio Management München Remote Growth-stage SaaS