Senior iOS Engineer - Craft Real-Time Trading UX

High Roller Technologies; New York (NY); On-site; USD 175,000 - 225,000; Full time

Benefits offered by this job

Health benefits

401(k) with match

Flexible vacation

Home office reimbursement

Mental health support

Job summary

ROLR in New York seeks a Senior iOS Engineer to own the iOS experience for our prediction markets platform. You’ll work across React Native and Swift, owning native interactions, performance, mobile components, and App Store delivery.

You’ll join a small but senior team within a public company, delivering a tactile, Apple-aligned user experience with secure authentication and real-time trading interfaces.

Qualifications

• 6+ years of professional iOS engineering experience.
• Shipped production consumer applications to the App Store.
• Strong Swift experience including SwiftUI and UIKit.
• Production React Native experience or strong native hybrid capability.
• Experience with iOS authentication and security frameworks (LocalAuthentication, Keychain, AuthenticationServices, OAuth 2.0 / OIDC).
• Experience with mobile design systems and component libraries.
• Understanding of mobile performance, accessibility, and Apple Human Interface Guidelines.
• Small, senior engineering team ownership.

Responsibilities

• Design and build the iOS interaction layer across React Native and Swift.
• Develop gestures, haptics, transitions, navigation, animations, and other native interactions.
• Build and maintain native components within the mobile design system.
• Develop real-time trading interfaces that perform under live market conditions.
• Implement authentication flows (OAuth 2.0 / OIDC, passkeys, biometrics).
• Develop native Swift modules where React Native is insufficient.
• Monitor and improve app performance (cold start, frame time, memory).
• Manage App Store releases, TestFlight, phased rollouts for a regulated finance category.
• Support multi-market functionality, localization and jurisdiction-specific features.
• Support code reviews, design discussions, and mentoring within the team.

Skills

Swift

SwiftUI

UIKit

React Native

OAuth 2.0 / OIDC

LocalAuthentication

Keychain Services

AuthenticationServices

App Store deployment

Performance optimization

Mobile design system

App security

Localization

Mentoring

Tools

Keycloak

Fastlane

Xcode Cloud

GitHub Actions

Job description

ROLR in New York seeks a Senior iOS Engineer to own the iOS experience for our prediction markets platform. You’ll work across React Native and Swift, owning native interactions, performance, mobile components, and App Store delivery.

You’ll join a small but senior team within a public company, delivering a tactile, Apple-aligned user experience with secure authentication and real-time trading interfaces.