Full-Stack Engineer - YC-backed AI Startup

Salary Transparency: This position is intended for candidates with 1+ years of professional experience. The salary range varies depending on experience, between €70,000 and €110,000 gross per year, plus equity participation. Work model: Full-time, 100% on-site, 5 days/week. Location: Munich, Germany. Muxon is a small, globally active recruitment agency and is conducting this search on behalf of our partner, a YC-backed AI SaaS startup transforming the construction industry through AI-powered software that automates complex quoting and sales processes. The company is growing rapidly and offers engineers significant ownership in a high-intensity, product-focused environment. Responsibilities Design and build scalable, production-grade full-stack systems using React, TypeScript and Python. Develop reliable backend APIs supporting AI capabilities and product growth. Own features end-to-end, from architecture and implementation through deployment, monitoring and iteration. Integrate LLMs, AI systems and large-scale data pipelines into production software. Contribute to system architecture, cloud infrastructure, Terraform and DevOps tooling. Work closely with users and the product team to turn real-world workflows into effective product solutions. Ship improvements rapidly through pragmatic engineering decisions and short iteration cycles. Requirements 1+ years of professional full-stack engineering experience. Strong experience with React, TypeScript and Python. Proven ability to build complex, reliable software systems and solve performance and scaling challenges. Experience with Docker, Cloud providers and Terraform. Strong ownership and product mindset, with the ability to work independently and drive ideas through execution. Willingness to work 5 days per week on-site in Munich. Excellent English communication skills. We value candidates who can demonstrate exceptional technical ability, ownership and impact — whether through professional experience, personal projects, academic work, or entrepreneurial ventures. Experience with AI/LLM systems, startups or founding-engineer environments is a strong plus. Benefits Equity participation. Company-paid sports membership and meal support. Paid two-week team offsite in San Francisco. High ownership, rapid career development and direct exposure to company building. Access to the AI and productivity tools you need. If you are an exceptional engineer looking to build high-impact AI products in a fast-growing startup, we encourage you to apply.