Platform Engineer at Flux

Why Flux Flux is taking the hard out of hardware. To do this, we’re building the world's first AI hardware engineer. Founded in 2019, our platform enables anyone to go from idea to manufacturable board using nothing more than a natural language prompt. This democratizes a process that has historically required years of specialized expertise. We're going after a $15B+ electronic design automation market, backed by 8VC, Bain Capital Ventures, Liquid 2 Ventures, Outsiders Fund, Figma board member John Lilly, and GitHub founder Tom Preston-Werner. In February 2026, we closed a total of $37M in funding to accelerate that mission. What happens when we unlock the ability for anyone to make hardware? We fundamentally reshape the world. That's our mission, and we're just getting started. The Role Flux is building the world’s first AI Hardware Engineer, and that means everything around it has to just work. As a Platform Engineer, you’ll work on the full-stack systems that power Flux’s platform experience beyond the editor: billing, authentication, onboarding, and integrations. You’ll ship production features that touch every user, keep the lights on, and make it possible for Flux to scale. What You’ll Do Build and maintain user-facing platform features (billing, auth, onboarding, settings). Integrate and maintain third-party APIs (Stripe, Firebase, analytics). Write TypeScript/Node backend services and React frontend components. Improve reliability and performance of core platform flows. Implement observability, logging, and error-tracking standards. Collaborate across teams to design APIs that support new products and integrations. Document architecture and best practices for your domain. What You’ll Bring 5+ years of professional software engineering experience. Strong proficiency in TypeScript, Node.js, and React. Experience integrating and maintaining 3rd party APIs. Proven track record shipping production full-stack web apps. Familiarity with cloud hosting (GCP/AWS/Firebase) and CI/CD basics. Strong debugging and cross-system troubleshooting skills. Excellent written and verbal communication; thrives in async, remote teams. Preferred Qualifications Experience with multi-tenant SaaS or collaborative web platforms. Familiarity with auth frameworks (OAuth, JWT, Firebase Auth). Exposure to observability stacks (Sentry, Datadog, Grafana). Prior experience building internal tools or admin dashboards. Startup or 0 → 1 product-building experience. Profile Impact-oriented: You don't feel done until real people are getting real value from what you built. Ambiguity-native: You thrive in the undefined. Agentic development is full of half-mapped terrain, soft constraints, and ideas that shift under your feet. That energizes you. You constantly update your intuitions as you go, and are excited to discover new and better ways to attack challenges we're still finding words to describe. Collaborative: You share your thoughts early and often, and welcome debate and cre