Full-Stack Engineer: AI-Driven Fitness Platform

Superset World, Inc.; New York (NY); Remote; USD 60,000 - 95,000; Full time

Job summary

Superset World, Inc. in New York City is seeking a full-stack engineer to own end-to-end product development across web and mobile, and to build AI-powered training workflows for gyms and wellness providers.

You will work with the CTO, deliver scalable backend systems, React web frontend and React Native mobile experiences, and shape data models, APIs, and performance decisions for real-world fitness operations.

Qualifications

• Strong full-stack engineering background with backend depth.
• Production-grade product shipping experience.
• Experience with React Native (Expo).
• Strong API, data modeling and system design knowledge.
• Experience with async systems and background workers.
• Strong ownership and communication.
• Must have: deep, personal experience in fitness; gym attendance; understanding real-world training.

Responsibilities

• Frontend development in React (web).
• Mobile development in React Native (Expo).
• Build AI-powered workflows to scale gym capabilities.
• Modeling data, APIs, and frontend systems to meet fitness professionals' needs.
• Systems that balance flexibility with guardrails and scale from pilot to enterprise.
• Collaborate with CTO and cross-functional teams across architecture, product and design.

Skills

Full-stack engineering

Backend depth

React Native (Expo)

APIs and data modeling

System design

Async processing

Performance and reliability

Ownership and communication

Tools

React

React Native

Expo

AWS

Docker

LLM APIs

Job description

Superset World, Inc. in New York City is seeking a full-stack engineer to own end-to-end product development across web and mobile, and to build AI-powered training workflows for gyms and wellness providers.

You will work with the CTO, deliver scalable backend systems, React web frontend and React Native mobile experiences, and shape data models, APIs, and performance decisions for real-world fitness operations.