Senior Frontend Engineer

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

Benefits offered by this job

Health benefits

401(k) retirement plan with company  匹

Job summary

High Roller seeks a Senior Frontend Engineer in New York to build the customer-facing experience for our prediction markets platform across web and mobile. You will own end-to-end frontends using React, React Native, and TypeScript, delivering real-time interfaces with live data feeds and session management.

You will collaborate with Product, Design, Backend, QA, and Compliance, contribute to the design system, ensure accessibility, and optimize performance for a fast-paced trading product in a

Qualifications

• 5–7 years of professional frontend engineering experience.
• Deep React experience with strong TypeScript and JavaScript skills.
• Experience building complex production web applications.
• Experience with real-time interfaces, WebSockets, or streaming data.
• Implemented authentication in production (OAuth 2.0 / OIDC, token lifecycle, secure sessions).
• Experience building accessible interfaces (WCAG 2.1 AA).
• Strong HTML, CSS, responsive design, and API integration.
• Strong debugging and frontend performance skills.
• Comfortable working with Product, Design, Backend, QA, and Compliance.
• Based in New York and able to work from our New York office.

Responsibilities

• Design and build customer-facing experiences using React, React Native, and TypeScript.
• Develop trading interfaces, live positions, settlement views, wallet and payout flows, identity journeys, and promotions.
• Build real-time interfaces using live data feeds and WebSockets under live market conditions.
• Build sign-up, sign-in, and session flows against Keycloak-based identity platform (OAuth 2.0 / OIDC, PKCE, passkeys).
• Contribute to the shared web and React Native design system.
• Ensure consistent experiences across web and mobile with design tokens and fixed-width live ticking numerals.
• Review partner codebases and maintain frontend architecture with external platforms.
• Build and improve internal back-office tools and dashboards.
• Monitor frontend performance, Core Web Vitals, and native frame times.
• Mentor across the engineering team and support architecture discussions.

Skills

React

TypeScript

JavaScript

HTML/CSS

API integration

WebSockets

Frontend performance

OAuth 2.0 / OIDC

WCAG accessibility

Design systems

Tools

Keycloak

WebAuthn / passkeys

React Native

Sentry / Datadog RUM

Job description

ABOUT ROLR

ROLR is building a prediction markets platform delivering the frontier of trading on sports, culture, economics, AI, commodities, and geopolitics.

You’ll be on a nimble startup-like team within a public company. Our customer experience spans mobile and web, from markets and live trading interfaces to onboarding, identity, payments, and operational tools. Our differentiation lives before the cashier: the game, the graph, and the notification. The consumer surface is the asset we own outright under every scenario, and this role will play a key part in building it.

Role Overview

We're looking for a Senior Frontend Engineer to join our team in New York and build the customer-facing experience of our prediction markets platform across web and mobile. You'll work across React, React Native, and TypeScript, building complex real-time consumer experiences with significant ownership from idea through production. This is not a role focused simply on implementing tickets. We're looking for engineers who think like product builders.

Key Responsibilities

• Design and build customer-facing experiences using React, 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 remain reliable 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

• Ensure consistent experiences across web and mobile, including design tokens, touch targets, and live-ticking numerals in fixed-width slots

• Work across internal and partner-maintained frontend codebases and review partner work to a high standard

• Maintain strong frontend architecture and appropriate boundaries between ROLR and external platform providers

• Build and improve internal back-office tools and operational dashboards

• Monitor and improve frontend performance, including Core Web Vitals on web and cold start and frame time on native

• Support code reviews, architecture discussions, and mentoring across the engineering team

You’ll need to:

• Have 5–7 years of professional frontend engineering experience

• Have deep React experience and strong TypeScript and JavaScript skills

• Have experience building complex production web applications

• Have experience with real-time interfaces, WebSockets, or streaming data

• Have implemented authentication in production, including OAuth 2.0 / OIDC flows, token lifecycle, and secure session handling

• Have experience building accessible interfaces (WCAG 2.1 AA)

• Have strong HTML, CSS, responsive design, and API integration experience

• Have strong debugging and frontend performance skills

• Be comfortable working across Product, Design, Backend, QA, and Compliance

• Be based in New York and work out of our New York office

Preferred Experience

• React Native in production, strongly preferred given our flagship mobile product

• Design systems, tokens, theming, and component libraries

• Keycloak or comparable identity platforms, passkeys / WebAuthn, and biometric unlock

• Real-time market data or trading interfaces

• Fintech, trading, prediction markets, or another regulated industry

• Internal/admin tooling frameworks and frontend observability, such as Sentry or Datadog RUM

• AI-native engineering workflows, including agentic coding and AI-assisted testing and review

What We Offer

• Base salary range: $180,000–$240,000 per year. Offers will be positioned within the range based on experience and qualifications

• Competitive health and welfare benefits

• 401(k) retirement plan with company match

• Flexible vacation policy

• Home office setup reimbursement

• Access to mental health support