Senior Full Stack Engineer
Fonzi · New York City · $175,000–$225,000 (stated in the posting)
Senior Full Stack Engineer
About Fonzi AI
We're a well-funded, fast-growing startup revolutionizing hiring through AI. Recently launched, we've already attracted thousands of top engineers to our platform. Our vision is to build an AI-powered recruiting marketplace that will connect millions of candidates and companies, where AI recruiters learn what you do, what you're interested in, and match you to perfect opportunities automatically.
The Role
We're seeking a Senior Full Stack Engineer who can own projects end-to-end and ship fast without sacrificing code quality. This is a backend-leaning full-stack role where you'll build the core platform that powers our AI-driven marketplace. You'll work directly with our technical lead to architect and implement features that directly impact how thousands of candidates and companies connect.
This isn't just another engineering role - you'll be a true product engineer who understands that every line of code impacts real users. You'll collaborate closely with our recruiting and marketing teams, translating business needs into technical solutions while maintaining the delicate balance between speed and scalability that defines successful startups.
What You'll Do
Drive complete feature development end-to-end, from initial design through production deployment
Build robust backend systems using TypeScript and Node.js while creating intuitive frontend experiences with React and Next.js
Integrate AI capabilities into applications
Work alongside AI models to accelerate development while maintaining code quality
Balance rapid delivery with long-term architectural considerations
Collaborate directly with recruiting and marketing teams to understand and solve their technical challenges
Ship code fast while maintaining awareness of long-term architectural implications
Shape product direction when requirements are still forming - you'll help define the 'what' not just build the 'how'"
Communicate technical concepts clearly to non-technical stakeholders
Required Experience
Strong TypeScript expertise: This is our primary language and you'll use it daily
Full-stack proficiency: Solid experience with Node.js, React, and Next.js
Backend focus: While full-stack, you should be stronger and more passionate about backend development
Database skills: PostgreSQL experience with ability to write efficient queries and design schemas
Serverless architecture: Experience building and deploying serverless applications
AI integration experience: You've integrated LLMs and AI models into production applications
Startup DNA: Minimum 5 years experience with proven success in fast-paced, ambiguous environments
Product mindset: Deep understanding of user experience and how engineering decisions impact business outcomes
Speed with intentionality: Ability to ship fast while being deliberate about technical debt trade-offs
Preferred Experience
Experience with AI prompting and working alongside AI coding assistants
Knowledge of CI/CD pipelines and deployment automation
Experience with cloud platforms (GCP preferred)
Background in marketplace or recruiting technology
Experience working directly with non-technical teams
What Makes You Successful Here
Extreme ownership: You take projects and run with them without constant oversight
Communication excellence: You can explain complex technical concepts to anyone
Adaptability: Thrive in a dynamic environment where priorities evolve based on business needs
Business acumen: You understand how your code impacts revenue and user experience
Self-directed: Thrives in minimal structure with loose sprint cycles
Speed-focused: Default to shipping and iterating rather than perfecting
What Makes This Special
High impact: Your code directly shapes how thousands of people find their next opportunity
Technical autonomy: Own entire features and make architectural decisions that matter
Cross-functional exposure: Work directly with recruiting, marketing, and leadership teams
AI at the edges: Build with cutting-edge AI tools while focusing on solid engineering fundamentals
Growth trajectory: Join early enough to influence technical direction as we scale
No red tape: Streamlined decision-making and flat organizational structure
Location
Brooklyn, NY - 3 days/week in office (Mondays required + 2 flexible days)
Compensation
$175,000 - $225,000 base salary + meaningful equity