Senior Full Stack Engineer

Senior Full Stack Engineer About Fonzi AIWe'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 RoleWe'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 DoDrive complete feature development end-to-end, from initial design through production deploymentBuild robust backend systems using TypeScript and Node.js while creating intuitive frontend experiences with React and Next.jsIntegrate AI capabilities into applicationsWork alongside AI models to accelerate development while maintaining code qualityBalance rapid delivery with long-term architectural considerationsCollaborate directly with recruiting and marketing teams to understand and solve their technical challengesShip code fast while maintaining awareness of long-term architectural implicationsShape 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 stakeholdersRequired ExperienceStrong TypeScript expertise: This is our primary language and you'll use it dailyFull-stack proficiency: Solid experience with Node.js, React, and Next.jsBackend focus: While full-stack, you should be stronger and more passionate about backend developmentDatabase skills: PostgreSQL experience with ability to write efficient queries and design schemasServerless architecture: Experience building and deploying serverless applicationsAI integration experience: You've integrated LLMs and AI models into production applicationsStartup DNA: Minimum 5 years experience with proven success in fast-paced, ambiguous environmentsProduct mindset: Deep understanding of user experience and how engineering decisions impact business outcomesSpeed with intentionality: Ability to ship fast while being deliberate about technical debt trade-offsPreferred ExperienceExperience with AI prompting and working alongside AI coding assistantsKnowledge of CI/CD pipelines and deployment automationExperience with cloud platforms (GCP preferred)Background in marketplace or recruiting technologyExperience working directly with non-technical teamsWhat Makes You Successful HereExtreme ownership: You take projects and run with them without constant oversightCommunication excellence: You can explain complex technical concepts to anyoneAdaptability: Thrive in a dynamic environment where priorities evolve based on business needsBusiness acumen: You understand how your code impacts revenue and user experienceSelf-directed: Thrives in minimal structure with loose sprint cyclesSpeed-focused: Default to shipping and iterating rather than perfectingWhat Makes This SpecialHigh impact: Your code directly shapes how thousands of people find their next opportunityTechnical autonomy: Own entire features and make architectural decisions that matterCross-functional exposure: Work directly with recruiting, marketing, and leadership teamsAI at the edges: Build with cutting-edge AI tools while focusing on solid engineering fundamentalsGrowth trajectory: Join early enough to influence technical direction as we scaleNo red tape: Streamlined decision-making and flat organizational structureLocationBrooklyn, NY - 3 days/week in office (Mondays required + 2 flexible days)Compensation