What you'll do: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.
In this role you will:- 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
What you'll need:- 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
Bonus points for:- 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
Compensation: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
Our Core Benefits Include:- Generous PTO
- 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
