Engineer, Full-Stack

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 is the AI-native operating system for modern fitness training.

We work with gyms, performance centers, and wellness organizations to deliver personalized training, programming, and health experiences at scale. Instead of fragmented tools, spreadsheets, and manual workflows, Superset brings everything into a single system of record.

At the core is AI Programming. We use modern LLMs layered with structured data, rules, and real-world constraints to generate, adapt, and deliver training programs across thousands of members. Coaches stay in control, but the system handles the heavy lifting.

We're design-led, engineering-driven, and building for operators who run real businesses, not just creators or hobbyists.

We're looking for a full-stack engineer who is strong on backend systems and comfortable building a product end-to-end, including web and mobile.

This is not a typical feature factory role. You'll work across the stack to build and scale:

• AI-powered training and program delivery
• Mobile and web experiences used daily by coaches and members
• Core systems that power real-world operations inside gyms and wellness organizations

You'll work directly with the CTO and closely with product and design. You'll have high ownership across architecture, product decisions, and execution as we scale.

What you'll work on

• Frontend product development in React (web)
• Mobile development in React Native (core user experiences for coaches and members)
• AI-powered workflows to scale the capabilities of industry leading gyms
• Modeling data, APIs, and frontend systems to meet the needs of fitness professionals and facilities
• Systems that balance flexibility with strong constraints and guardrails
• Infrastructure that scales from early pilot projects to large enterprise deployments

What we're looking for

• Strong full-stack engineering skills with clear backend depth
• Experience building and shipping production products end-to-end
• Proficiency with or working in React Native (Expo)
• Strong understanding of APIs, data modeling, and system design
• Experience with async systems, queues, and background processing
• Ability to reason about performance, reliability, and tradeoffs
• Pragmatic and product-minded. You can move fast without creating unnecessary complexity
• Strong ownership and communication

Must have:

• Deep, personal experience in fitness
• Regularly attends gyms, classes, or structured training
• Strong intuition for how training programs actually work in the real world (coaches, clients, sessions, progress, constraints)
• Immaculate attention to detail and interest in leading projects end-to-end

Nice to have:

• Experience with AI/ML pipelines or LLM integrations
• Experience with high-throughput or multi-tenant systems
• Familiarity with fitness, health, or real-world operational workflows
• Frontend: TypeScript, React and React Native (Expo)
• Infrastructure: AWS, Docker
• Data + AI: LLM APIs, structured data pipelines, background workers
• Payments + integrations: Stripe, third-party health and fitness APIs

Why this role

• Work across backend, frontend, and mobile in a single role
• Build real AI systems used in production, not prototypes
• Shape how training and wellness programs are delivered at scale

Our team

Our founders:

• Peter Coles (CTO, MIT, he/him) has 14 years experience working on and leading engineering teams in NYC including the trail-blazing ML startup, Hunch, which was acquired by eBay, and the innovative wearable company, Ringly. He has a long track record of building and sharing projects on GitHub and writing about his work, and is a member of the Recurse Center community. He also built the most popular screenshotting extension, GoFullPage, which is a deceptively simple tool for solving a surprisingly complex problem.
• Taylor Pemberton (CEO, SCAD, he/him) has over a decade of experience working on brand, design, and product for some of the most inspiring tech companies of today. He ran his own high-end studio that included embedding into product teams in Google to develop a mobile learning platform, Airbnb Experiences, and at Spotify as a product design lead on the creator tools team. Taylor is NASM certified and a huge gym enthusiast.

We're based in New York City and prioritize candidates with at least ~4 hours of overlap with Eastern Time. Our center of mass is in NYC, but we operate as a distributed team today, with strong representation in Brazil, and are open to candidates in similar time zones.

We believe in having a range of experiences and backgrounds on our team. Diversity makes for a better place to work, a better product, and a better company overall. We facilitate a diverse workplace by prioritizing psychological safety and robust communication. Part of this involves monthly retros and 1:1 check-ins on a recurring basis. In order for our platform to be successful in serving all fitness creators, we look to have voices, builders, stakeholders, and leaders internally who are bringing and hearing different perspectives.

Compensation

• Salary: $60k-$95k paid in USD
• Meaningful early equity
• High ownership and growth trajectory

We're a NYC-based team of principal level product, design, engineering, and growth leads, with added background as coaches, athletes, and gym owners. We're building the operating system for modern fitness — and we're looking for people who care deeply about craft, quality, and the details.