Principal React Engineer

ION

Principal React Engineer leading design and implementation of trading UI for financial clients at Lab49. Involves collaboration with project teams and engineering stakeholders to deliver solutions.

Posted 4/30/2026full-timeNew York City • New York • 🇺🇸 United StatesLead💰 $180,000 - $230,000 per yearWebsite

Tech Stack

Tools & technologies

CloudJavaScriptPythonReactSDLCTypeScript

About the role

Key responsibilities & impact

Partnering with our client to lead the design and build of a structured products trading UI using modern web development technology and techniques. You will be responsible for managing engineering deliverables, and the relationships with other key contributors to deliver great software.
Design, document, and plan for the technical implementation and delivery of working software into production.
Act as a hands-on engineer and architect to support ongoing project work. Lead and actively participate in projects, serving as a role model for project teams and collaborating with other practices to ensure successful outcomes.
Partner with client counterparts and stakeholders to maintain and build relationships, maintaining a commercial approach. Develop strong relationships with clients as a strategic partner and technical advisor, contributing to expanding our footprint and securing follow-on work.
Partner with the Lab49 business development team to create and deliver compelling pitches, defining problems, captivating clients, presenting solutions, and working out engagement terms. Build and reinforce your professional network through active engagement in industry events and public speaking opportunities.
Contribute to the Interactive Practice: The UI engineering team within Lab49. This means bringing your passion and opinionated view of what makes for great UI development to the wider UI engineering community within Lab49.
Assist in developing effective management skills and practices among line managers in the Engineering practice, fostering strategic career planning and development for the engineering team as a whole.

Requirements

What you’ll need

10+ years of hands-on experience designing and building complex, commercial-grade software applications.
A primary engineering skillset focused on delivering UIs for digital products.
Experience with JavaScript and TypeScript, with modern frameworks specifically React.
5+ years of solid hands-on experience in Python development.
Proven track record in effective leadership, problem-solving, and decision-making.
Experience designing holistic technical solutions, managing integrations with third party services and APIs, and deploying applications into production.
Experience collaborating with project teams and interacting with clients in finance, consulting, or start-up environments.
A passion for technology and innovation, staying informed about the latest industry trends through active participation in industry events, meet-ups, and more.
Experience with one or more cloud platforms with a working understanding of contemporary SDLC practices such as continuous delivery.
Strong understanding of the value of testing, quality, continuous integration, source control, and code reviews.
Experience in capital markets, financial markets/products, consulting is highly desirable.

Benefits

Comp & perks

Discretionary bonus
Paid holidays
401(k)
Comprehensive medical, dental, and vision coverage
Life insurance
Short and long-term disability
Commuter FSA
Family Building Benefits

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Hard Skills & Tools

JavaScriptTypeScriptReactPythonUI designAPI integrationcloud platformsSDLCcontinuous deliverysoftware development

Soft Skills

leadershipproblem-solvingdecision-makingcollaborationrelationship buildingcommunicationstrategic planningnetworkingpublic speakingmentoring