About the job
Senior AI Product Engineer
About Fonzi AI
At Fonzi AI, we are a pioneering Series A startup, backed by Lightspeed, dedicated to transforming the hiring landscape through the power of AI. Established by seasoned entrepreneurs from Kumospace, we launched our innovative AI-driven recruiting marketplace in June 2025 and have quickly become revenue-positive, partnering with nearly 100 employers—over 75% of whom are AI-native companies. Our platform is home to thousands of engineers, and we proudly host Match Days every two weeks, where pre-screened candidates receive competitive offers from leading employers.
Our vision is to create an infrastructure where AI comprehensively understands the roles of engineers, their aspirations, and seamlessly matches them with suitable opportunities. We are committed to moving beyond surface-level AI applications and are building toward a future where intelligent systems manage the entire recruiting workflow. We seek engineers who share our passion for this vision and are eager to help shape the future with us.
The Role
As a Senior AI Product Engineer, you will embrace a multifaceted role in this new era of software development. The distinction between "full-stack engineer" and "AI engineer" is rapidly diminishing, and at Fonzi, we have embraced this convergence.
You will take ownership of features from inception to deployment: designing database schemas, developing React components, and creating the AI agents that infuse intelligence into our platform. Some weeks, you’ll focus on building robust backend systems; other weeks, you'll experiment with cutting-edge models to develop features that feel transformative. Most weeks, you’ll engage in both aspects.
We are in search of engineers who have experienced the "aha moment"—those who recognize that AI fundamentally alters the software development landscape and wish to work at a company where this principle is embedded in every product decision.
What You'll Build
AI Agents that facilitate intelligent conversations with candidates, including voice interfaces for onboarding engineers, coaching systems for interview preparation, and adaptive matching algorithms that evolve with each interaction.
The Platform powering a two-sided marketplace, utilizing TypeScript/Node.js for backends, React/Next.js for frontends, and PostgreSQL for the data layer, all designed for speed and rapid iteration.
AI-Powered Features from conception to production—rapidly prototype using the latest models, strategically balancing cost, quality, and speed, then scale successful features to thousands of users.
The Intelligence Layer that enhances our marketplace with each candidate interaction, creating a data flywheel that will establish our competitive edge.

