Sr. Software Engineer II, Backend - NT Connect

What you'll do:

Ninja Trader is seeking a Sr. Software Engineer II to join our NT Connect team—our API‑based brokerage integration layer that powers connections with introducing brokers, fintech partners, and third‑party platforms. In this pivotal role, you will help design, build, and evolve the backend services that underpin our partner integrations, brokerage APIs, and trading infrastructure. As a senior engineer on the team, your work will have a direct impact on partner success, trader outcomes, and revenue growth.

You will collaborate closely with Engineering, Product, QA, and cross‑functional partners to deliver high‑quality, scalable solutions for our broker partners. If you are passionate about distributed systems, real‑time systems, API platforms, and the intersection of technology and financial markets, this is an outstanding opportunity to make a meaningful impact.

• Design, develop, and maintain high‑quality backend services that power the NT Connect brokerage API platform, ensuring scalability, reliability, and low‑latency performance
• Architect and implement RESTful and Web Socket APIs for partner integrations, including introducing brokers, fintech partners, and third‑party trading platforms
• Deploy and manage backend services in a Kubernetes/GCP environment, with a focus on availability, resilience, and observability
• Implement robust monitoring, logging, and alerting solutions using industry‑standard observability tooling (e.g., Open Telemetry) to track and analyze system performance in real time
• Collaborate with cross‑functional teams and stakeholders to deliver end‑to‑end solutions that meet partner requirements, compliance standards, and business goals
• Uphold and elevate engineering quality through code reviews, test coverage, CI/CD pipelines, release readiness, and incident response
• Drive architectural decisions and technical roadmap planning, helping shape the evolution of the NT Connect platform
• Leverage AI coding agents (e.g., Git Hub Copilot, Cursor, Claude Code) and modern developer tooling to accelerate delivery, improve code quality, and raise the team’s engineering velocity

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience)
• 8+ years of software development experience with distributed, backend systems, preferably in a high‑performance or near real‑time environment
• Strong proficiency in one or more JVM‑based languages (Scala, Java, or Kotlin); experience with reactive, message‑driven frameworks is highly valued
• Proven experience designing and building RESTful APIs and Web Socket services for external partners or B2B platforms
• Experience with Kubernetes and cloud infrastructure (preferably GCP), with a focus on scalability and high availability
• Deep understanding of modern distributed systems and ability to troubleshoot across the full stack (HTTP/HTTPS, Web Sockets, TLS, TCP/IP, DNS)
• Strong understanding of security best practices for exposed APIs and backend services: authentication, authorization, data isolation, encryption, and audit logging
• Strong problem‑solving skills with the ability to take full ownership of projects—from design through deployment, maintenance, and iteration
• Excellent written and verbal communication skills; a collaborative team player who seeks feedback and drives continual improvement
• Demonstrated use of AI coding agents and tools (e.g., Git Hub Copilot, Cursor, Claude Code, or equivalent) to meaningfully improve personal and team productivity — treating AI‑assisted development as a standard part of the modern engineering workflow
• Familiarity with financial systems and trading concepts: orders, fills, margin, account lifecycle, and regulated workflows (KYC/AML, reporting)
• Experience with FIX protocol, market data feeds, or brokerage integration patterns (FCM, clearing, or embedded finance platforms)
• Background in multi‑tenant SaaS platform architectures, partner onboarding, and API rate limiting strategies
• Experience working in a regulated fintech, trading, or brokerage environment
• Familiarity with Pub/Sub messaging systems (e.g., GCP Pub/Sub) and…