Software Engineer Technical Lead

Position: Software Engineer Tech Lead (Python)Location: Hybrid (Spain)Offices: Madrid About Us Backed by top-tier Silicon Valley Investors (Kholsa Ventures, Sequoia and A*), Luzia launched in April 2023 initially designed as a personal assistant on WhatsApp (now in App and web as well), with the sole aim of making AI available to everyone. We have grown rapidly and have experienced great success; capturing a unique audience of GenZ users based in Spain, LATAM and around the world. In our first 18 months, Luzia has become the fastest Spanish consumer-focused company to reach 1M daily active users worldwide.We are constantly evolving and working on improving our product and tech to deliver best-in-class user experience focusing on GenZ - helping them with anything they need. At Luzia, we ship fast: keep it simple, learn from every experiment, own outcomes, and build what our users need. We thrive in a fast-paced environment and expect everyone to use AI daily—automating the routine and amplifying creativity—because using AI isn't optional; it's how we win. As a Software Engineer Lead, you'll join the leadership of our experienced engineering team, driving the development of scalable, high-impact solutions that power our AI-driven products.Responsibilities - Lead Backend Development: Design, build, and deploy backend services with a focus on scalability, performance, and robustness, particularly for applications utilizing LLMs. - Cross-Functional Collaboration: Work closely with product, and engineering teams to translate business needs into scalable, high-performing technical solutions. - API Development: Design and manage inter-service communications, ensuring seamless integration across our AI products. - AI Experience and Best Practices: Act as the AI referent within the engineering team, Define and uphold engineering best practices for AI, including model integration, prompt optimization, evaluation pipelines, and AI deployment. - Code Excellence: Maintain high standards for code quality, testing, and deployment, championing best practices in continuous integration and development. - Mentorship: Provide guidance and mentorship to junior engineers, fostering a culture of innovation, collaboration, and continuous improvement. - System Optimization: Continuously analyze and optimize system performance, scalability, and reliability. - Architectural Input: Engage in system architecture discussions, influencing the technical roadmap and future development strategies. Requirements - Experience: 8+ years of professional experience in Python development (additional languages are a bonus). - Startup DNA: Previous experience in a startup environment, thriving in fast-paced, dynamic teams. - Cloud Expertise: Hands-on experience with cloud environments, modern databases, and distributed data ecosystems. AWS is a plus. - AI/ML Focus: Hands on experience or side projects involving AI, with a deep understanding of LLMs and other AI/ML technologies. - Customer-Centric: Driven by a product-focused mindset, ensuring technical solutions align with customer needs. - Communication: Strong communication skills. Fluency in English and being comfortable working in an English environment is necessary. - Proactive Leadership: Self-starter with excellent prioritization skills, able to work autonomously while driving results. - Business-Technical Translator: Ability to communicate complex technical concepts in a way that resonates with business stakeholders. - Education: Bachelor's degree in Computer Science, Engineering, or related fields. Nice-to-Haves - Experience with high-performance computing and system optimization. - Previous leadership or project management experience. - B2C experience, particularly with large user databases. Benefits: - Be part of an innovative project in the field of artificial intelligence. - Opportunities for growth and professional development in cutting-edge technologies. - Competitive salary and attractive benefits package. - Flexible, inclusive, and collaborative work culture. Why Join Us? We are on a journey to make AI meaningful, accessible, and transformative for millions of users. At Luzia, you'll have the opportunity to be part of a fast-growing startup, contributing to products that are transforming the AI space. We are a product and engineering-oriented team, always seeking to push boundaries and drive forward momentum. We are committed to building a high quality experience for our users and prioritizing ethical practices around AI. We are passionate about exploring, learning, and mastering the world of AI, and we would love for you to join us Our Culture and Values: We live and breathe agility. Our culture is steeped in a "ship, experiment, iterate, ship" mentality, where action, experimentation, and rapid execution are paramount. Our team is collaborative, innovative, and deeply mission-driven. If you're passionate about AI, love solving complex problems, and are looking to make a significant impact, we'd love to hear from you.