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At Phinomenon, we believe browsing should be as intelligent as you are. We're building Phi Browser, an AI-powered companion that learns your habits, anticipates your needs, and opens new possibilities in how you interact with the digital world. Our mission is to create technology that doesn't just serve you—it understands you.

Frontend Engineer
Engineering

Shape the future of AI-native browsing — build sleek, lightning-fast React/TypeScript UIs that connect users to next-gen AI models, while working in a well-funded, burnout-free, global startup.

San Francisco +5 more
macOS Application Engineer
Engineering

Craft high-performance, polished macOS apps in Swift & AppKit/SwiftUI — help shape the intelligent, AI-native Phi Browser experience on desktop, all in a well-funded, globally distributed, burnout-free startup.

San Francisco +5 more
Full Stack Engineer
Engineering

Build and own the end‑to‑end stack behind Phi Browser — designing APIs, data layers, and web UIs — while leveraging "vibe‑coding" and AI tools in a well‑funded, global startup that prioritises impact and balance.

San Francisco +5 more
UI/UX Engineer
Design

Be the bridge between design and code — build beautiful, intuitive interfaces that feel native, human, and powered by AI, all while working in a well-funded, global team that values balance and creativity.

San Francisco +5 more
Security Engineer
Engineering

Protect Phi Browser users from hackers and prying eyes — design and implement robust, privacy-first security measures in a well-funded, global startup that values both impact and work-life sanity.

San Francisco +4 more
C/C++ Engineer
Engineering

Dive into the heart of Chromium — write clean, high-performance C++ that powers the Phi Browser's core, in a global, well-funded startup that values impact over burnout.

San Francisco +5 more
AI Product Researcher
Research

Unearth how users interact with our AI/browser combo — blend data, experimentation, and intuition to define compelling product experiences in a well‑funded, global startup that values impact and sanity.

San Francisco +5 more