Senior Fullstack Engineer @ GPTZero | $140k - $210k + Equity

blazetalent; New York (NY); Hybrid; USD 140,000 - 210,000; Full time

Benefits offered by this job

H-1B sponsorship

Job summary

blazetalent is seeking a Senior Fullstack Engineer to join a fast-growing AI-detection and content-verification platform. You will design and build fullstack apps with React/TypeScript, collaborating with product and ML teams to deliver high-impact features.

The role emphasizes experimentation platforms, in-app notifications, and end-to-end ownership in a hybrid NYC environment. Visa sponsorship is available for the right candidate.

Qualifications

• Production-grade fullstack experience across backend and UI.
• Expertise in React, TypeScript, and modern JS frameworks.
• Experience with SQL, NoSQL and text search databases.
• End-to-end feature delivery in collaborative settings.
• Strong cross-functional communication; US work eligibility.

Responsibilities

• Design, develop, and maintain fullstack applications using React, TypeScript, and modern backend technologies.
• Enhance the experimentation platform to drive product innovation and growth.
• Build robust in-app notification systems and other growth-oriented features.
• Collaborate with product, design, and machine learning teams to deliver seamless user experiences.
• Participate in all stages of the product lifecycle—concept, implementation, testing, deployment, and monitoring.
• Write well-tested, maintainable code and contribute to architectural decisions.
• Mentor junior engineers and share best practices across the engineering team.

Skills

React

TypeScript

JavaScript

SQL

NoSQL

Text search

Education

Bachelor’s degree in Computer Science or related field

Tools

Next.js

Job description

Senior Fullstack Engineer

Our client is a fast-growing technology company building a leading AI-detection and content verification platform that helps organizations distinguish between human-written and AI-generated text. Using proprietary models fine-tuned on diverse writing styles, the platform analyzes content at the sentence, paragraph, and document level to provide clear, interpretable results.

Their tools are trusted by millions of users across education, publishing, legal, recruitment, cybersecurity, and media. Core features include a browser extension for real-time detection, dashboard batch processing, API integrations, and visual highlighting of AI-detected text. By combining machine learning, experimentation systems, and intuitive UIs, the platform empowers users to uphold content authenticity, protect intellectual property, and combat AI-driven misinformation.

They are expanding their New York team with experienced engineers who thrive in fast-moving environments, embrace responsibility, and are motivated by growth. In this role, you’ll work on high-impact features such as experimentation platforms and in-app notification systems, directly influencing user engagement and company growth. Their environment blends startup energy with engineering rigor—weekly hackathons, regular offsites, and a close-knit, collaborative team culture.

What you’ll do:

• Design, develop, and maintain fullstack applications usingReact,TypeScript, and modern backend technologies
• Enhance their experimentation platform to drive product innovation and growth
• Build robust in-app notification systems and other growth-oriented features
• Collaborate with product, design, and machine learning teams to deliver seamless user experiences
• Participate in all stages of the product lifecycle—concept, implementation, testing, deployment, and monitoring
• Write well-tested, maintainable code and contribute to architectural decisions
• Mentor junior engineers and share best practices across the engineering team

Experience required:

• Proven experience building production applications from backend to UI
• Expertise inReact,TypeScript, and modern JavaScript frameworks (Next.js a plus)
• Strong understanding of databases (SQL, NoSQL, and text search)
• Track record of delivering features end-to-end in collaborative environments
• Strong communication skills and ability to work cross-functionally
• Bachelor’s degree in Computer Science or related field preferred
• Work eligibility in the US (H-1B transfer sponsorship available)

Summary:

• Job name:Senior Full Stack Engineer
• Work type:Full-time
• Hours:Hybrid, 4 days/week in NYC office
• Location:New York, NY
• Compensation:$140K–$210K USD base + equity (~0.1%, $20K–$50K/year)
• Visa sponsorship:H-1B transfer sponsorship available
• Company size:~15 engineers, growing
• Funding + investors:Well-funded, growth-stage
• Reporting to:Engineering leadership

Interview process:

1. Recruiter call
2. Two-hour React take-home project (no AI assistance)
3. Two to three engineering interviews
4. Culture interview with CEO
5. Reference checks