Senior iOS Engineer — Real-Time Fintech Platform (NYC)

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

Benefits offered by this job

Health benefits

401(k) retirement plan with company  匹

Flexible vacation policy

Home office setup reimbursement

Mental health support

Job summary

ROLR is seeking a Senior iOS Engineer in New York to own the iOS experience for our prediction markets platform. You will work across React Native and Swift, delivering native interactions, performance, and App Store readiness.

You’ll join a small, senior team with significant ownership, shipping production apps and optimizing for cold starts, frame time, and memory usage while adhering to Apple guidelines.

Qualifications

• 6+ years of iOS engineering experience.
• Shipped production iOS apps to the App Store.
• Strong Swift experience (SwiftUI/UIKit) and hybrid React Native capability.
• Experience with iOS authentication and security frameworks (LocalAuthentication, Keychain, OAuth/OIDC).
• Familiarity with mobile design systems and components.
• Awareness of Apple Human Interface Guidelines and performance.

Responsibilities

• Design and build the iOS layer across React Native and Swift.
• Develop gestures, haptics, transitions, navigation, animations, and other native interactions.
• Build and maintain native components within the design system.
• Create real-time trading interfaces with high performance under live markets.
• Implement OAuth 2.0 / OIDC-, passkeys, and biometric authentication flows.
• Develop native Swift modules where React Native is not sufficient.
• Monitor and improve app performance: cold start, frame time, memory usage.
• Manage App Store releases, TestFlight, phased rollouts for a regulated finance app.
• Support multi-market localization and jurisdiction-specific features.
• Participate in code reviews, design discussions, and mentoring.

Skills

Swift

SwiftUI

UIKit

React Native

iOS performance

Security frameworks

OAuth 2.0

OIDC

LocalAuthentication

Keychain Services

AuthenticationServices

Tools

Keycloak

Job description

ROLR is seeking a Senior iOS Engineer in New York to own the iOS experience for our prediction markets platform. You will work across React Native and Swift, delivering native interactions, performance, and App Store readiness.

You’ll join a small, senior team with significant ownership, shipping production apps and optimizing for cold starts, frame time, and memory usage while adhering to Apple guidelines.