Firebase Developer Jobs in California (NOW HIRING)

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.

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.

• 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.

• 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.

• 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.

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 creative collaboration. Flux is a deeply collaborative company, and we believe that the best ideas can only win if they're said out loud.

Convention-averse: Flux is an AI-first company. We constantly experiment with new workflows, tools, and ways of working together. You feel an urgency to reimagine how we create and collaborate in this rapidly changing world, and you value critical thinking far above established conventions.

Ownership mentality: You are a self-starter, bias toward action, and care deeply about the team and community who lean on you and your work.

Flux is an equal opportunity employer. We are committed to providing equal employment opportunities to all qualified individuals and do not discriminate on the basis of race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), national origin, age, disability, genetic information, veteran status, or any other characteristic protected by applicable federal, state, or local law. All employment decisions are based on qualifications, merit, and business need.

Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.