Senior Software Engineer, UI Platform

The Role

We're seeking a Senior Software Engineer to join our UI Platform team to build the cornerstone of our frontend trading technology. Our team maintains the Component Library and services that enable real-time data flow to UIs across our trading products while providing technical leadership throughout the organization. As a key member of our team, you'll architect high-performance React, Node.js (server), and Design System components, all of which power mission-critical trading applications. Help us shape the future of financial trading interfaces with elegant, scalable solutions.

In this role you will:

• Use your passion for creating high quality software to collaboratively build software solutions that impact the entire MarketAxess organization.
• Be a valued part of our team which is proud of its culture of collaboration and experimentation.
• Use your desire for continuous improvement and learning to take on new skills to accelerate our platform’s modernization.

We embrace diverse perspectives and people who are not afraid to challenge assumptions and prior ways of working.  We believe this is key to learning and growing, both as a team, and as an individual.

You are the right candidate if you know how to:

• Optimize Frontend Performance: Create virtualized grid components and real-time data visualizations that maintain responsiveness under heavy data loads
• Dive Deep Technically: Understand React and associated libraries at their core, allowing you to solve complex rendering and state management challenges
• Build Component Systems: Design and implement reusable, performant React components. Construct and maintain organization-wide component libraries with consistent APIs, theming, and documentation
• Curate Large Monorepos: Manage enterprise monorepos with complex dependencies, ensuring scalability and efficient cross-team collaboration
• Balance Stakeholder Needs: Navigate complex requirements from multiple teams while maintaining technical excellence and project momentum

How You'll Help Take Us There

• Develop and maintain our core UI component library, focusing on sophisticated data grids and financial visualization components
• Implement real-time data flow solutions that handle complex trading data with minimal latency
• Create extensible, reusable components that work seamlessly across our product ecosystem
• Collaborate with product teams to identify shared UI patterns and develop scalable solutions
• Establish best practices for React/TypeScript development, state management, and testing
• Mentor junior developers and guide teams on component implementation and architecture
• Contribute to our modernization efforts as we evolve toward cloud-native technologies

What We’re Looking for  

• 7+ years of enterprise JavaScript/TypeScript development experience
• 3+ years building complex applications with React hooks and component architecture
• Expert knowledge of data grid implementations (AG-Grid) and virtualization techniques
• Experience with modern state management (Redux) and asynchronous data handling
• Proficiency with modern CSS approaches (styled-components, CSS-in-JS, Tailwind)
• Strong testing practices using Jest and React Testing Library
• Experience integrating with Java/Spring Boot backend services
• Knowledge of WebSockets for real-time data applications
• Proficiency with Git and collaborative workflows
• Understanding of microservice architectures and API design
• Familiarity with Agile development processes
• Must be legally authorized to work in the United States without sponsorship

What You Can Expect from Us

• Hybrid Environment: Our employees enjoy a mix of working in the office and from home
• Free Food: We provide free lunch for employees when they are working in the office. Plus, our offices are stocked with snacks
• Paid Time Off: Competitive PTO package including vacation and personal days, sick leave and charity days
• Generous Parental Leave: Up to 20 weeks fully paid leave
• 401(k): Dollar-for-dollar employer match up to $17,500
• Employee Stock Purchase Plan: Employees can purchase MarketAxess common stock at a discount
• Wellness Stipend: We provide employees with up to $1K annually towards gym memberships, home office equipment and more
• Onsite Healthcare: We offer convenient access to world-class care through Mount Sinai at our Hudson Yards location
• Tuition Assistance and Professional Development: Benefit from live and on-demand learning, role-specific training, employee-led Lunch and Learns and guest speakers
• Core benefits: Highly competitive medical, dental, and vision programs

For job positions in NYC, NY, and other locations where required, the estimated salary range for a new hire into this position is $150,000 USD to $225,000 USD. Actual salary may vary depending on job-related factors, which may include knowledge, skills, experience, and location. You may also be eligible for annual cash incentives, equity, and other benefit programs.

MarketAxess Corporation and its affiliates provide equal employment opportunities to all persons regardless of age, color, national origin, citizenship status, physical or mental disability, race, religion, creed, gender, sex, sexual orientation, gender identity and/or expression, genetic information, marital status, veteran status, or any other legally protected characteristic in the location in which the candidate is applying.

All of your information will be kept confidential according to EEO guidelines.