Senior Frontend Engineer - Real-Time Trading UIs

High Roller Technologies; New York (NY); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Health benefits

401(k) with company match

Flexible vacation policy

Home office setup reimbursement

Mental health support

Job summary

ROLR is seeking a Senior Frontend Engineer in New York to build the customer-facing experience of its prediction markets platform for web and mobile. You will own product-minded frontend work across React, NextJS, React Native, and TypeScript, delivering real-time interfaces with live data and secure authentication.

You will collaborate with Product, Design, Backend, QA, and Compliance to ship scalable web applications, improve performance, and contribute to design systems and tooling.

Qualifications

• 5+ years of professional frontend engineering experience.
• Strong React/NextJS with TypeScript/JavaScript skills.
• Experience shipping complex production web apps at scale.
• Real-time interfaces using WebSockets or streaming data.
• Authentication in production: OAuth 2.0 / OIDC flows, token lifecycle.
• WCAG 2.1 AA accessibility, responsive design, and API integration.
• Collaborate with Product, Design, Backend, QA, and Compliance.

Responsibilities

• Design and build customer-facing experiences using React, NextJS, React Native, and TypeScript.
• Develop trading interfaces, live positions, settlement views, wallet and payout flows, identity and verification journeys, and promotions.
• Build real-time interfaces using live data feeds and WebSockets that stay honest under live market conditions.
• Build sign-up, sign-in, and session flows against our Keycloak-standardized identity platform: OAuth 2.0 / OIDC with PKCE, token lifecycle, passkeys (WebAuthn), and biometric step-up on native surfaces.
• Develop and contribute to the shared web and React Native design system: one component API, two renderers.
• Ensure consistent experiences across web and mobile: design tokens, 44pt touch targets, live-ticking numerals in fixed-width slots.
• Work directly across internal and partner-maintained frontend codebases, and review partner work to your own standard.
• Maintain strong frontend architecture and appropriate boundaries between ROLR and external platform providers.
• Develop and grow the BFF layer, to support native and web applications.
• Build and improve internal back-office tools and operational dashboards.
• Monitor and improve frontend performance: Core Web Vitals on web, cold start and frame time on native.
• Support code reviews, architecture discussions, and mentoring across the engineering team.

Skills

React/NextJS

TypeScript/JavaScript

Real-time interfaces

OAuth/OIDC auth

WCAG accessibility

HTML/CSS

Frontend debugging

Cross-team collaboration

Frontend architecture

New York-based

Job description

ROLR is seeking a Senior Frontend Engineer in New York to build the customer-facing experience of its prediction markets platform for web and mobile. You will own product-minded frontend work across React, NextJS, React Native, and TypeScript, delivering real-time interfaces with live data and secure authentication.

You will collaborate with Product, Design, Backend, QA, and Compliance to ship scalable web applications, improve performance, and contribute to design systems and tooling.