Fonzi
AI & Machine LearningDirect Ashby career site

Senior Full Stack Engineer

Pay
$175,000 – $225,000 per year
Location
New York City, NY (Remote)
Job type
Full-time
Level
Senior
Experience
5+ years
Listed
22 days ago

Skills & highlights for this role

  • TypeScript
  • Node.js
  • React
  • PostgreSQL

Also useful

  • Next.js
  • serverless
  • LLM integration
  • GCP

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)

Pay and benefits

COMPENSATION $175,000 - $225,000 base salary + meaningful equity

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.

Read the original posting

From Fonzi's careers page, first listed on Rolev.ai on October 17, 2026. Rolev.ai is not the employer.

How Rolev.ai helps with this application

Rolev.ai is a job search and application tool for US job seekers. For this Senior Full Stack Engineer role at Fonzi, it shows how your resume fits, tailors your resume to the posting, and prepares the application for you to review.

  • See how you fit

    Openings from employer career sites are ranked against your whole resume—and searchable inside Claude, ChatGPT, and Cursor via Rolev.ai MCP.

  • Tailor without inventing

    Every change to your resume is checked against your original. New experience goes in only with your yes—zero fabricated claims.

  • Draft the full kit

    Tailored and Full Match resumes, role-specific cover letters, and answers to employer screening questions are prepared in seconds.

  • 1-Click Extension Autofill

    The Chrome extension fills the employer's Greenhouse, Workday, Lever, or Ashby form in 1 click. You review it and press Submit.

Common questions

What is the salary for the Senior Full Stack Engineer role at Fonzi?

The Senior Full Stack Engineer posting at Fonzi states compensation of $175,000 – $225,000 per year. It is listed as a full-time position. Final pay may depend on location, experience, and interview evaluation on Fonzi's official career site.

Where is the Senior Full Stack Engineer job at Fonzi located?

Yes, this Senior Full Stack Engineer opening at Fonzi is listed as New York City, NY (Remote). Always check Fonzi's application page for specific state eligibility or relocation policies.

What qualifications are required for Senior Full Stack Engineer at Fonzi?

For the Senior Full Stack Engineer role, Fonzi highlights 5+ years of relevant experience; experience with TypeScript, Node.js, React, PostgreSQL. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.

How do I apply for the Senior Full Stack Engineer position at Fonzi?

This listing links directly to Fonzi's Ashby application page. You can apply directly on Fonzi's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Ashby application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.