Sr. Software Engineer II, Fullstack - NT Connect
About The Position
NinjaTrader is building NT Connect — our API-based brokerage integration layer that powers connections with introducing brokers, fintech partners, and third-party platforms. We're looking for a Sr. Fullstack Engineer to join the NT Connect team and help us design and build the services, APIs, and developer experience that make our platform a joy to integrate with. If you're passionate about crafting high-quality full-stack systems in a fintech environment where your work directly shapes partner outcomes and trading experiences, this is your opportunity. You'll work across the entire stack — backend services, API architecture, web tooling, and partner integration workflows — to create a scalable, secure, high-throughput platform. As a senior engineer on the NT Connect team, your contributions will significantly impact the developer experience, product roadmap, and overall business outcomes.
Requirements
- Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience)
- 8+ years of professional software development experience, with strong depth across both frontend and backend systems
- Strong backend engineering skills with Node.js and TypeScript, including building production-grade APIs, authentication flows, and API versioning strategies
- Proven experience designing RESTful and WebSocket APIs for external partners or B2B platforms
- Strong frontend engineering skills with a modern framework (React preferred); ability to deliver complex, data-driven UIs with high attention to design fidelity
- Hands-on experience with cloud-native environments: Docker, Kubernetes, and GCP
- Strong SQL and database knowledge, including schema design, query optimization, and migrations
- Experience with performance optimization, caching strategies, and event-driven architectures
- Demonstrated use of AI coding agents (e.g., GitHub Copilot, Cursor, Claude Code) to meaningfully improve personal and team productivity — treating AI-assisted development as a standard part of the modern engineering workflow
- Strong written and verbal communication skills; comfortable working with partner-facing and cross-functional teams, with the ability to take full ownership of projects from design through deployment, maintenance, and iteration
Nice To Haves
- Familiarity with OAuth2, JWT, API key systems, or signed request authentication patterns
- Experience with financial, brokerage, or trading systems
- Experience with message queues or streaming platforms (e.g., Pub/Sub, Kafka)
- Experience building SDKs or developer toolchains for external integrators
- Familiarity with infrastructure-as-code tools such as Terraform
- Experience working in a regulated fintech, trading, or brokerage environment
Responsibilities
- Contribute to the development, optimization, and operational health of NT Connect's web-based platform, building new features and maintaining existing ones across the full stack
- Design and implement scalable, efficient backend services and APIs using Node.js and TypeScript, deployed on cloud-based infrastructure (e.g., Google Cloud Platform)
- Collaborate closely with UX/UI designers to translate design prototypes into high-quality, scalable frontend code that adheres to NinjaTrader's design system and branding guidelines
- Ensure seamless integration of frontend components with backend systems, including account management tools, partner onboarding flows, and real-time market data feeds
- Develop and maintain real-time performance monitoring and logging solutions to ensure the platform remains responsive, observable, and production-ready
- Collaborate with other engineering teams, QA, and Product Managers to deliver end-to-end partner solutions that meet reliability, compliance, and usability standards
- Leverage AI coding agents (e.g., GitHub Copilot, Cursor, Claude Code) and modern developer tooling to accelerate delivery, improve code quality, and raise the team's engineering velocity
Benefits
- Annual target bonus of 10%
- 401K plan through ADP with company match up to 3.5%
- 18 days of annual paid time off accrual
- Seven paid holidays
- Paid Parental Bonding Leave
- Health, Vision, Dental Coverage
- Life and Disability Insurance Covered 100% by NinjaTrader
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
Associate degree
