{"id":2504191,"url":"https://alion.io/job/blaze-talent-senior-fullstack-engineer-gptzero-140k-210k-equity","title":"Senior Fullstack Engineer @ GPTZero | $140k - $210k + Equity","company":{"id":4421824,"name":"Blaze Talent","domain":"blazetalent.com","url":"https://alion.io/company/blazetalent","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Gem","truth_index":{"grade":"C","score":66,"open_postings":35,"ghost_share":0.571,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-19T05:45:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["New York, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140000,"max":210000,"currency":"USD","period":"year","gross":null,"usd_annual":210000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":true,"relocation_package":false,"has_equity":false,"technologies":[{"name":"JavaScript","optional":false},{"name":"Machine Learning","optional":false},{"name":"Next.js","optional":false},{"name":"React.js","optional":false},{"name":"SQL","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2025-08-14T14:47:37Z","employer_posted_date":"2026-02-13","last_verified_at":"2026-10-19T12:51:23Z","board_verified":true,"closed_at":null,"days_open":430,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":430},"description":"Senior Fullstack Engineer\nOur 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.\nTheir 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.\nThey 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.\nWhat you’ll do:\nDesign, develop, and maintain fullstack applications using React, TypeScript, and modern backend technologies\nEnhance their experimentation platform to drive product innovation and growth\nBuild robust in-app notification systems and other growth-oriented features\nCollaborate with product, design, and machine learning teams to deliver seamless user experiences\nParticipate in all stages of the product lifecycle-concept, implementation, testing, deployment, and monitoring\nWrite well-tested, maintainable code and contribute to architectural decisions\nMentor junior engineers and share best practices across the engineering team\nExperience required:\nProven experience building production applications from backend to UI\nExpertise in React, TypeScript, and modern JavaScript frameworks (Next.js a plus)\nStrong understanding of databases (SQL, NoSQL, and text search)\nTrack record of delivering features end-to-end in collaborative environments\nStrong communication skills and ability to work cross-functionally\nBachelor’s degree in Computer Science or related field preferred\nWork eligibility in the US (H-1B transfer sponsorship available)\nSummary:\nJob name: Senior Full Stack Engineer\nWork type: Full-time\nHours: Hybrid, 4 days/week in NYC office\nLocation: New York, NY\n Compensation: $140K-$210K USD base + equity (~0.1%, $20K-$50K/year)\nVisa sponsorship: H-1B transfer sponsorship available\nCompany size: ~15 engineers, growing\nFunding + investors: Well-funded, growth-stage\nReporting to: Engineering leadership\nInterview process:\nRecruiter call \nTwo-hour React take-home project (no AI assistance)\nTwo to three engineering interviews\nCulture interview with CEO\nReference 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