NinjaTrader - Sr. Software Engineer (Scala)
Requirements
• 5+ years of backend software engineering experience building production systems that handle real-time data, concurrency, and high availability • Strong, hands-on Scala expertise, including idiomatic Scala, functional patterns, testing with ScalaTest or similar tools, and comfort working in a large, existing Scala codebase • Experience with actor-based concurrency models, such as Akka, Pekko, or equivalent technologies, including an understanding of supervision, message passing, and backpressure • Solid relational database skills with PostgreSQL, including schema design, indexing, query optimization, and sound judgment about when to use JSONB versus a normalized structure • Comfort with event-driven architectures, message buses such as Kafka or Pub/Sub, and asynchronous workflows • Excellent troubleshooting skills, with the ability to read logs, trace requests across distributed systems, and isolate root causes under pressure • Demonstrated ability to write clear technical specifications, scope work realistically, and identify risks early • High standards for code, tests, documentation, and pull requests, along with a willingness to uphold those standards during code reviews • 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 explain backend tradeoffs to technical and non-technical audiences • Self-starter who thrives in ambiguity and can manage multiple complex backend initiatives simultaneously • Experience with trading platforms, fintech, or capital markets technology • Understanding of trading concepts, including order routing, market data, position management, risk and liquidation logic, and profit and loss calculations • Familiarity with Protobuf, gRPC, or schema-based service contracts • Experience migrating or modernizing legacy Scala systems or evaluating transitions from Scala to Rust or Go • Background in observability, including distributed tracing, structured logging, and metrics using Datadog, Google Cloud Platform, or similar technologies • Prior experience supporting enterprise or business-to-business partner integrations
Responsibilities
• We are seeking a Sr. Software Engineer to join our Evaluation Services team. Our Evaluation Services business powers funded trader programs that give aspiring traders a pathway to professional trading capital. You will design, build, and maintain the Scala-based backend systems that power our auto-liquidation engine, risk evaluation, and trading services—the core systems our platform and partners depend on. You will own complex backend problems end-to-end and work alongside Trading Services Engineers, frontend engineers, QA, and solutions engineers to deliver high-quality, production-ready features in a fast-paced environment. • Design and implement backend services in Scala for evaluation, risk, and trading service workloads, including real-time auto-liquidation, account state management, and post-trade processing • Build and evolve actor-based systems, such as Akka or similar technologies, that handle high-throughput market data, position changes, and event-driven workflows • Own significant features end-to-end, from technical specifications through implementation, code review, and production handoff • Design data models and database changes in PostgreSQL, including JSONB where appropriate, and contribute to the shared master schema, Protobuf, and SQL repositories • Diagnose and resolve complex backend issues, including production incidents, by analyzing logs, tracing distributed flows, and reproducing edge cases under realistic loads • Drive code quality across the team through thorough pull request reviews, clear acceptance criteria, disciplined development testing, and proper instrumentation and observability • Collaborate with Trading Services, Solutions Engineering, and Product to translate business requirements into well-scoped, accurately estimated stories • Contribute to architectural decisions and long-term technical debt remediation, including modernizing legacy Scala services and evaluating new event bus technologies • Mentor junior team members on Scala idioms, functional design, testing practices, and incident response • Develop deep expertise in NinjaTrader’s evaluation platform and partner integrations to provide authoritative backend leadership
Benefits
• The salary range for this role will be $125,000.00 - $175,000.00 USD. In addition, this position will also receive an annual target bonus of 12%. Bonus pay at NinjaTrader is based on individual performance (50%) as well as company/team performance (50%). • Salary and bonus earnings are only two components of the total compensation package offered by NinjaTrader. NinjaTrader offers a 401K plan through ADP under which the company will match up to 3.5% of employee contributions. Annual paid time off allowance accrues at a rate of 18 days per year (some positions may qualify for more) plus seven paid holidays. • Location: • This role is based in Chicago, IL. *There may be remote flexibility for exceptional candidates in the following states: California, Colorado, Florida, Georgia, Illinois, Indiana, Minnesota, Missouri, Montana, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, South Carolina, Texas, Utah, Vermont, Virginia, Washington, Washington DC, Wisconsin. • Hybrid: • For Chicago-based employees, we follow a hybrid work schedule: In-office Tuesday through Thursday, with remote work on Mondays and Fridays. In addition to these weekly remote days, we offer: • 20 additional flex remote days annually • 5 Company Wide Office-Optional weeks tied to major holidays • 7 Paid Holidays Annually + 5 Conditional Holidays Annually • 1 Service Day Annually • 401k with 3.5% Company Match • Paid Parental Bonding Leave • Health, Vision, Dental Coverage • Life and Disability Insurance Covered 100% by NinjaTrader • We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender, gender identity or expression, or veteran status. We are proud to be an equal opportunity workplace.
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