Jobs › Jump Trading

UI Developer

Jump Trading · Chicago, IL · IT Infrastructure + WCW

Posted Aug 8, 2026 · We last checked this listing on Sep 20, 2026

Apply at Jump Trading

Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

Behavioral

Walk me through a UI platform or shared component library you built that other developers had to adopt. What made it succeed or struggle?

whether they have real platform-building experience versus just feature work, and whether they understand adoption challenges

Tell me about a time you had to change something in a shared UI platform that you knew would break or annoy downstream teams. How did you handle it?

their approach to managing breaking changes and empathy for consuming developers, which the posting explicitly calls out

Tell me about a time pair-programming changed the outcome of a piece of work, for better or worse.

genuine comfort with pair programming as a daily practice, not just tolerance of it

Describe a situation where you had to estimate a piece of UI work in a sprint and got it wrong. What happened and what did you change afterward?

honesty about estimation misses and whether they adjust process rather than repeat mistakes

Technical

How would you design a React component library so that teams across the firm can use it without you being in the room for every decision?

architectural thinking around reusability, API design, and documentation for a platform team, not just app-level React skill

Say you're building a UI that needs real-time market data over WebSockets alongside REST calls for less time-sensitive data. How do you structure that so the UI stays responsive under heavy message volume?

practical experience with WebSocket protocols and performance under load, which matters a lot in a trading context

What's your approach to unit testing UI code, and where do you draw the line between what needs a test and what doesn't?

whether their testing discipline matches the emphasis on quality process described in the posting

How do you use TypeScript to catch problems early rather than just as documentation? Can you give a specific example where types saved you from a bug?

depth of TypeScript usage versus surface familiarity

What have you done with Kubernetes, Helm, or CI/CD pipelines, even if it wasn't your main job?

whether they have the bonus infrastructure exposure or are purely front-end focused

How do you think about visual and interaction design when there isn't a dedicated designer handing you specs?

the 'eye for quality design' the posting mentions as a plus, and whether they can operate without heavy design support

Situational

Imagine a trading desk asks for a highly custom, visually complex dashboard, but you know a simpler pattern from the platform would get them 90 percent of the way there faster. How do you handle that conversation?

judgment on when to push for simplicity versus build custom, and stakeholder pushback skills

If a team building on top of your platform reports that their app feels slow, what's your process for figuring out whether it's their code, your platform, or something else?

debugging methodology and ownership when the platform is a shared dependency

This role expects reliable, predictable availability. What does a typical week look like for you in terms of hours and how you handle something urgent that comes up outside them?

fit with the firm's expectations around availability and reliability for a business-critical platform

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The full job description

As published by Jump Trading.

Jump Trading Group is committed to world class research. We empower exceptional talents in Mathematics, Physics, and Computer Science to seek scientific boundaries, push through them, and apply cutting edge research to global financial markets. Our culture is unique. Constant innovation requires fearlessness, creativity, intellectual honesty, and a relentless competitive streak. We believe in winning together and unlocking unique individual talent by incenting collaboration and mutual respect. At Jump, research outcomes drive more than superior risk adjusted returns. We design, develop, and deploy technologies that change our world, fund start-ups across industries, and partner with leading global research organizations and universities to solve problems. Jump Trading has a global team of technologists who architect, build and maintain our world-class trading platform. From optimizing our core trading engine to building custom hardware, we leverage software & hardware engineering, sophisticated front-end technologies, data science and research, to deliver the infrastructure and tools that drive our trading and business needs. We are looking for an experienced UI front-end developer to join our UI platform team.  We operate in a fast-paced, highly collaborative, agile environment with an emphasis on pair-programming, testing and good process to help us produce high-quality code and applications very efficiently.  Our focus is on delivering business value to the firm: we aim for simplicity wherever possible but build cutting-edge UIs when the business need is clear. In this role, you will be expected to build and extend our core UI platform, use the platform to build business-critical applications, and work with a wide variety of teams to help them use the platform to build their own applications.  You should be very comfortable with the ecosystem of tools & techniques within the modern web development environment, and you should have a deep passion for enabling other developers to be more productive. Skills You'll Need: <ul> <li>At least 4+ years of professional experience building web-based UIs</li> <li>Extensive experience with React, TypeScript, WebSocket protocols, REST, and UI unit-testing</li> <li>Very comfortable working in a highly agile, collaborative methodology (sprints, pair-programming, testing, estimation, etc.)</li> <li>Deep empathy for developers who will consume your platform and foresight to deliver improvements while also managing change carefully</li> <li>Reliable and predictable availability </li> </ul> Bonus Points: <ul> <li>An eye for quality design</li> <li>Experience with Kubernetes, Helm, containers, CI/CD pipelines</li> <li>Experience working in trading / finance.</li> </ul> If you are currently a student or recent graduate, please see our Campus postings which offer both intern and full-time opportunities.<div class="content-pay-transparency"><div class="pay-input"><div class="description">Benefits <ul> <li style="font-size: 14px;">Discretionary bonus eligibility </li> <li style="font-size: 14px;">Medical, dental, and vision insurance</li> <li style="font-size: 14px;">HSA, FSA, and Dependent Care options</li> <li style="font-size: 14px;">Employer Paid Group Term Life and AD&D Insurance</li> <li style="font-size: 14px;">Voluntary Life & AD&D insurance</li> <li style="font-size: 14px;">Paid vacation plus paid holidays</li> <li style="font-size: 14px;">Retirement plan with employer match</li> <li style="font-size: 14px;">Paid parental leave</li> <li style="font-size: 14px;">Wellness Programs </li> </ul></div><div class="title">Annual Base Salary Range </div><div class="pay-range">$200,000—$250,000 USD</div></div></div>

Apply at Jump Trading

UI Developer

Likely interview questions for this role

Practice this interview out loud.

The full job description

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