Build like a founder. Ship like Spartan.
Our customers are scaling fast — and so are we. That’s why we’re looking for a Fullstack Engineer (React/TypeScript) to join our world-class team.
At Spartan, we don’t act like vendors. We embed with startups backed by YC, Pear VC, a16z, Techstars, and more — partnering with founders and engineers from Stanford, MIT, Yale, Google, Amazon, Uber, and beyond. Together, we help launch MVPs in 30 days and scale systems that power millions of users.
This isn’t “just another engineering role.” It’s a chance to build across the stack, craft intuitive user experiences, and design scalable backend systems — seeing your work directly power companies raising millions on the global stage.
You’ll also be working at the frontier of AI: 70% of our portfolio today is LLM-powered. Our engineers leverage the latest tools like Cursor, Claude, and Codex to accelerate development and integrate AI-native workflows into everything we build.
What You’ll Do
- Build scalable, reliable, and beautiful fullstack applications with React, TypeScript, and Node.js/Next.js.
- Work directly with US startup founders and product leaders — shaping solutions that drive their business forward.
- Ship fast with a proven process: async standups, PRDs/RFCs, code reviews, automation.
- Work in an AI-native workflow — leveraging tools like Cursor, Claude, and Codex to reduce boilerplate and boost iteration speed.
- Uphold engineering excellence — clean code, testing, documentation, reliability.
- Help shape Spartan’s engineering culture — we’re 1% pass-rate engineers who work like founders, not contractors.
What We’re Looking For
- Fluent in English — you’ll work directly with US startup founders.
- 3+ years building production-grade applications.
- Strong expertise in React, TypeScript, and modern JavaScript (ES6+).
- Solid backend experience (Node.js, Next.js, APIs, databases).
- Knowledge of frontend fundamentals: state management, performance optimization, accessibility.
- Experience with design systems, responsive UI, and API integrations.
- A builder’s mindset — you care about solving problems, not just writing code.
Tech We Use
- Frontend & Backend
- React • TypeScript • JavaScript (ES6+)
- Next.js • Node.js • TailwindCSS • Storybook
- GraphQL • REST APIs
- Databases & Infra
- Postgres • Mongodb • ElasticSearch • Redis
- AWS • GCP • Vercel • Docker • Kubernetes
- AI-native tooling
- Cursor • Claude • Codex
Perks & Benefits
- 💰 Competitive salary
- 🏝 Unlimited PTO + public holidays
- 🩺 Premium healthcare insurance
- 🏃 Sports coverage (Strava integration)
- 🏠 Hybrid working style
- ✈️ Annual company trip + monthly team parties
Career Growth
- Work with founders from YC, Stanford, Uber, Amazon, Bird, and more.
- Exposure to cutting-edge fullstack + AI stacks.
- Transparent career path and mentorship from engineers who’ve scaled startups to IPO.
- Solve real startup challenges — every project feels like its own mini-startup.
Why Spartan
- 50+ MVPs launched, 3 IPOs, $100M+ raised.
- 95% engineer retention — because we hire the top 1%.
- You’ll never just “take tickets” here. You’ll own problems, ship fast, and grow with the founders we partner with.
Top Skills
What We Do
{FAST, CORRECT} CHOOSE 2. We ship MVPs in weeks, not quarters, combining AI-powered workflows with world-class engineers to deliver precision at speed. With playbooks from 70+ VC-backed launches and 3 IPOs, we take you from idea to revenue in record time.
