Senior Platform Engineer

• 8+ 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.