Hiring: Sr. Software Engineer I, Scala Company: NinjaTrader Location: Chicago, IL Job Posted Time: 2026-09-17 10:55:50 Employment Type: Remote Target Skills & Keywords : Capital Markets, Datadog, Event-Driven, GCP, Kafka, PostgreSQL, Protobuf, Pub/Sub, Rust, SQL, Scala, gRPC About the job Experience: •5+ years of backend software engineering experience building production systems that handle real-time data, concurrency, and high availability Required Skills: •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 •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 •Partner cross-functionally 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 Qualifications: •Design data models and database changes in PostgreSQL, including JSONB where appropriate, and contribute to the shared master schema, Protobuf, and SQL repositories Compensation: •$125,000 - $175,000 / year •Flexible work environment (work from home / hybrid options) •In addition, this position will also receive an annual target bonus of 12% Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!