Senior Mobile Engineer

Summary

Are you a mobile engineer who thrives on building exceptional user experiences, bringing a new product to life, and raising the technical bar for the team around you? As a Senior Mobile Engineer at Topstep, you'll play a foundational role in building our mobile trading platform with React Native and TypeScript. Mobile is new for Topstep, and the product is at an early MVP stage—an opportunity to shape both the trader experience and the engineering foundations behind it.

You'll help build out the MVP, establish reusable patterns and components, and own mobile features from design through iOS and Android release. The challenge is to turn high volumes of real-time trading data into a mobile experience that stays responsive, clear, and trustworthy as market activity and app usage grow. You'll work closely with product, design, backend engineers, and quality engineering, bringing mobile expertise into cross-functional feature teams as the product grows.

This role combines deep React Native expertise with a product mindset and pragmatic engineering judgment. You'll balance immediate delivery with a foundation other engineers can build on, mentor through reviews and pairing, and help define what mobile excellence looks like at Topstep.

Key Responsibilities

• Help build out Topstep's mob