Senior Software Engineer II, Backend

Responsibilities

• Design, develop, and maintain Rust services and crates for account creation, identity verification, and KYC/CIP decisioning.
• Build integrations with identity, fraud, and screening providers, including response modeling, deserialization, and fixture-based testing.
• Implement determination logic as pure, table-tested functions with authoritative rule definitions.
• Design asynchronous, task-based delivery of outcomes to downstream systems, including idempotency keys, retry and resumption semantics, and completion gates.
• Ensure correct handling of personally identifiable information and identity documents through redaction, minimal projections, encryption, secret management, and audit logging.
• Express market and product differences through policy and configuration.
• Operate services through instrumentation, structured logging, alerting, and incident response.
• Design and implement scalable, reliable service architecture using cloud infrastructure such as Google Cloud Platform and Kubernetes.
• Lead cross-functional Rust design reviews, establish technical contracts, and mentor engineers.

Requirements

• 6+ years of professional software development experience, including substantial production Rust experience.
• Strong command of Rust in production, including ownership and lifetimes, error modeling, trait design, the Tokio async ecosystem, Serde, and a SQL layer such as SQLx or Diesel.
• Experience writing highly testable Rust with pure functions, table-driven tests, fixture-based integration tests, and strict contract tests.
• Experience designing HTTP and event-driven service integrations, including versioning and backward compatibility.
• Experience handling sensitive data through encryption, secret management, least-privilege access, and audit requirements in containerized cloud environments such as Docker and Kubernetes.
• Demonstrated use of AI coding agents such as Codex, Cursor, or Claude Code, with the ability to review and validate AI-assisted code.
• Excellent communication skills and ownership of delivered systems.
• Bachelor's or master's degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience.

Nice-to-haves

• Experience with identity verification, KYC/AML, CIP, or fraud and risk decisioning systems.
• Experience in fintech, trading, brokerage, or crypto, particularly in regulated financial services.
• Experience with a large Rust monorepo, shared crates, workspace tooling, and multi-team code ownership.
• Familiarity with policy-driven flow engines, YAML- or JSON-defined workflows, gRPC or protobuf contracts, and feature flagging platforms such as Statsig.
• Interest in futures, crypto, derivatives, and trading technologies.

Compensation and Benefits

• Salary range: $140,000.00–$190,000.00 USD.
• Annual target bonus of 12%, based equally on individual and company/team performance.
• 401(k) plan with company matching up to 3.5% of employee contributions.
• 18 days of annual paid time off, plus seven paid holidays.
• Generous PTO, additional conditional holidays, one service day annually, paid parental bonding leave, health, vision, and dental coverage, and life and disability insurance covered 100% by NinjaTrader.
• Chicago hybrid schedule: in-office Tuesday through Thursday and remote Mondays and Fridays, with additional flex remote days and office-optional weeks.