Hiring: Sr. Software Engineer II, Backend (Rust) Company: NinjaTrader Location: Chicago, IL Job Posted Time: 2026-09-11 11:55:56 Employment Type: Contract / Remote Target Skills & Keywords : Derivatives, Docker, Encryption, Event-Driven, GCP, Integration Testing, Kubernetes, Protobuf, REST, Rust, SQL, gRPC About the job Experience: •6+ years of professional software development experience, including substantial production Rust Required Skills: •You'll be NinjaTrader's Rust authority for the onboarding domain while working alongside Rust engineers across the wider Payward organization. As the senior-most Rust engineer on the Onboarding squad, your work will significantly impact approval rates, time-to-funding, and our ability to extend the platform into new markets. •Design, develop, and maintain Rust services and crates that power account creation, identity verification, and KYC/CIP decisioning •Build integrations with identity, fraud, and screening providers, including response modeling, deserialization, and fixture-based scenarios that make third-party behavior deterministically testable •Write the determination logic as pure, table-tested functions, with one authoritative definition of each rule rather than the same rule reimplemented in three places •Design asynchronous, task-based delivery of outcomes to downstream systems: idempotency keys, retry and resumption semantics, and completion gates that wait on a real receipt instead of assuming success •Own data-handling correctness for flows carrying PII and identity documents, covering redaction and minimal projections, encryption in transit and at rest, secret management, and audit logging •Express market and product differences as policy and configuration, so supporting a new jurisdiction is a policy change rather than a refactor •Operate what you build: instrumentation, structured logging, alerting, and incident response for services where a silent failure quietly stops customers from funding Compensation: •$140,000 - $190,000 / year •Flexible work environment (work from home / hybrid options) •In addition, this position will also receive an annual target bonus of 10% 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!