Lead AI Engineer

About the Role Take end-to-end ownership of an established B2B SaaS platform serving real estate businesses, and lead its evolution toward AI-first product development. You will initially be the sole engineer, reporting to the CEO, then help grow and mentor the engineering team. What You'll Do • Own architecture, application code, infrastructure, security, and releases for a live multi-tenant platform. • Modernize web and mobile systems using agentic development tools, testing, CI/CD, feature flags, and preview environments. • Build production AI agents for resident request triage and operator workflows, including evaluations, guardrails, and privacy protections. • Automate internal workflows with agents and MCP integrations for sales, customer success, and operations. • Maintain APIs and data integrations with ERP systems and hardware partners. • Establish AI-enabled engineering practices and hire and mentor future engineers. What We're Looking For • At least 3 years shipping production software, ideally in a startup or small team with end-to-end ownership. • Strong full-stack TypeScript skills and solid cloud, database, and API fundamentals. • Production experience building LLM features or agents, including tool use, retrieval, evaluations, and attention to cost and latency. • Regular use of agentic coding tools, with experience reviewing and verifying AI-generated code at scale. • Experience modernizing live systems while maintaining reliability, and building security and GDPR protections into multi-tenant products. • Experience with web and mobile codebases, component-based frontend frameworks, testing, CI/CD, and feature flags. • Cloud, platform, or developer experience in high-scale or hyperscaler environments is beneficial. • Founding engineer, first engineering hire, or founder experience and early mentoring experience are beneficial. English fluency is required; German is not required. Compensation & Benefits €100,000 to €115,000 annual base salary, depending on experience, plus virtual share options. Visa sponsorship policy was not specified. Location Remote across Europe, with occasional paid visits to the office in Düsseldorf, Germany. Primary location: Barcelona, Catalonia, Spain.