Sr. Software Engineer I, Evaluation Services

NinjaTrader is an industry-leading trading platform and futures broker that provides software and brokerage services for traders. The Sr. Software Engineer will serve as a technical advisor to partners integrating with NinjaTrader APIs, troubleshoot complex integration issues, improve API support quality, and build tools that enhance support efficiency. The role also involves mentoring team members and translating partner feedback into platform improvements.

Responsibilities:

• Serve as the senior technical point of contact for partners integrating with NinjaTrader APIs, providing expert guidance on authentication, endpoints, data models, and architectural best practices
• Partner directly with external engineering teams to debug complex integration issues, conduct code reviews of their implementations, and accelerate time-to-production
• Collaborate closely with Technical Account Managers to deliver a seamless partner experience, translating business requirements into technical solutions and providing real-time support during critical integration milestones
• Diagnose and resolve complex API issues spanning WebSocket connections, REST endpoints, and real-time data feeds, often under time pressure with high-value partners
• Own the quality standard for API support, establishing best practices for troubleshooting, documentation, and partner communication that the broader team can follow
• Build and enhance internal tools, scripts, and diagnostic utilities that improve support efficiency and enable faster issue resolution
• Drive continuous platform improvement by synthesizing partner feedback into actionable recommendations for Product and Engineering, influencing the API roadmap
• Mentor junior team members on technical troubleshooting, partner communication, and maintaining composure in high-stakes situations
• Develop deep expertise in NinjaTrader's evaluation platform, trading systems, and API architecture to provide authoritative technical leadership

Requirements:

• 5+ years of software engineering experience, with deep hands-on expertise in API development, system integrations, and building or supporting partner-facing platforms
• Proven track record of working alongside Technical Account Managers and cross-functional teams to deliver successful partner outcomes in a fast-paced environment
• Strong proficiency with REST APIs, WebSockets, JSON, OAuth, and API debugging tools (Postman, curl, browser developer tools, network analyzers)
• Hands-on experience with TypeScript/JavaScript, Python, or similar languages for scripting, debugging, and building reference implementations
• Demonstrated ability to work directly with partner engineering teams by reviewing code, pair debugging, and guiding architectural decisions
• Excellent troubleshooting skills with the ability to analyze logs, trace API calls, and isolate issues across distributed systems under pressure
• High quality standards with attention to detail in documentation, communication, and technical deliverables
• Ability to think on your feet and adapt quickly when priorities shift or unexpected issues arise
• Outstanding written and verbal communication skills with the ability to translate complex technical concepts for both technical and non-technical audiences
• Self-starter who thrives in ambiguity and can manage multiple high-priority partner engagements simultaneously
• This role is based in Chicago, IL
• We follow a hybrid work schedule: In-office Tuesday through Thursday, with remote work on Mondays and Fridays
• Experience with trading platforms, fintech, or capital markets technology
• Familiarity with React, Node.js, or full-stack TypeScript development
• Background in developer experience (DevEx), developer advocacy, or technical evangelism
• Experience with API documentation tools (Swagger/OpenAPI, ReadMe, or similar)
• Prior experience supporting enterprise or B2B partner integrations
• Passion for futures, derivatives, and trading technologies
• There may be remote flexibility for exceptional candidates in the following states: California, Colorado, Florida, Georgia, Illinois (outside the Chicago area), Indiana, Minnesota, Missouri, Montana, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, South Carolina, Texas, Utah, Vermont, Virginia, Washington, Washington DC, Wisconsin