Senior Software Engineer, Rips (Mobile)

TRIUMPH; San Francisco (CA); On-site; USD 150,000 - 210,000; Full time

Job summary

Triumph is building Rips, a collectibles trading card app for mobile. You will own core features in React Native and Expo, shipping thoughtful UX and high polish from design through launch. You’ll work closely with backend engineers on API design, chase performance goals, and shape the architecture that enables teammates to move quickly.

This is hands-on, end-to-end ownership in a small, fast team. You’ll operate in a lean environment where the person who designs a feature also ships it and owns

Qualifications

• Strong mobile engineering background with React Native and Expo preferred.
• Own consequential work: ship features you designed and maintain them.
• Deep platform understanding of device behavior beyond UI components.
• Craftsmanship and polished interactions for native-feeling UX.
• Ability to architect and set guardrails for teams to move quickly.
• Familiarity with AI as a tool; able to explain every line shipped.
• In-person collaboration required at Triumph's headquarters in San Francisco.

Responsibilities

• Build and own core product features in React Native and Expo from design through launch and iteration.
• Care about motion, gesture, transitions, perceived performance, and details that impact daily usage.
• Dive into native modules, platform APIs, rendering behavior, and build configuration when needed.
• Collaborate with backend engineers on API and data model design, advocating for strong contracts.
• Ensure performance and reliability: startup time, frame rate under load, crash-free sessions.
• Contribute patterns and architecture that empower mid-level and junior engineers to move fast.

Skills

React Native

Expo

Mobile engineering

Ownership

Native iOS/Android

Performance

Architecture

AI fluency

Collaboration

Job description

The Role

Rips is our collectibles trading card app, it lives on mobile, and it is growing fast. You'll be building it.

This is the product, not a port of it. Our app is React Native and Expo. You'll be shipping to real users who are trading real value, which means correctness, latency, and polish are not separable concerns here. A dropped state update is not a cosmetic bug when there is money on the other side of it.

You'll own significant surface area from day one: features end to end, the interaction quality that makes them feel native, and the technical decisions underneath. We're a small team, so the person who designs something is the person who ships it and the person who owns it afterward.

What You'll Do

• Build and own core product features in React Native and Expo, from design discussion through launch and iteration.
• Take the user experience seriously: motion, gesture, transitions, perceived performance, and the small details that separate an app people tolerate from one they open every day.
• Go below the abstraction when the problem requires it. Native modules, platform APIs, rendering behavior, build configuration.
• Partner with backend engineers on API and data model design, pushing back when a contract makes the client worse.
• Own performance and reliability for what you ship: startup time, frame rate under load, crash free sessions.
• Raise the floor for the team. The patterns you set should make the next feature faster and make the right approach obvious to whoever builds it.

What We're Looking For

• Strong mobile engineering background. React Native and Expo experience is ideal. Native iOS or Android engineers who want to move into React Native will also do well here.
• Real ownership of consequential work. Tell us about the feature you designed and shipped and still maintain, not the test coverage number you moved.
• Deep platform understanding. You know what is happening on the device, not just which component to reach for. You can debug something the framework does not explain.
• Craft. You have opinions about how an interaction should feel and you can implement them.
• A track record of creating leverage. You establish the architecture and the guardrails that let mid level and junior engineers move quickly without breaking things, you articulate a technical direction, and you defend it well enough that people follow it.
• Fluency with AI as a tool, never as a replacement for understanding. You use it aggressively and can explain every line that ships under your name.
• In person. Our team gathers 5 days a week at Triumph's headquarters at Levi's Plazain San Francisco.