Senior Platform/API Engineer — Node.js & TypeScript | Hybrid

NinjaTrader; Chicago (IL); Hybrid; USD 140,000 - 190,000; Full time

Benefits offered by this job

Generous PTO

7 Paid Holidays Annually + 5 Cond. HOL

1 Service Day Annually

401k with 3.5% Company Match

Paid Parental Bonding Leave

Health, Vision, Dental Coverage

Life and Disability Insurance

Job summary

NinjaTrader is seeking a Senior Backend Engineer to design, develop, and operate backend services in production. You’ll build Node.js and TypeScript systems for account creation, verification, and funding hand‑offs, leveraging event-driven patterns across queues and streaming platforms.

You’ll own multi-step flows, idempotency, and resilient orchestration while collaborating with cross‑functional teams in a hybrid Chicago-based role.

Qualifications

• 6+ years of professional software development experience building and operating backend services in production.
• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience).
• Deep Node.js and TypeScript expertise, with strong command of asynchronous patterns, concurrency, and backpressure.
• Proven production experience with event-driven architecture, including delivery guarantees and poison-message handling, on message queues, pub/sub, or streaming platforms such as Kafka or Google Cloud Pub/Sub.
• Demonstrated experience building idempotent, resumable workflows that stay correct under retries, partial failure, and out-of-order delivery.
• Strong SQL and schema design, plus hands-on experience with Docker, Kubernetes, and a major cloud platform.
• Demonstrated use of AI coding agents (Codex, Cursor, Claude Code) as a standard part of your engineering workflow, with the judgement to review and validate AI-assisted code before it ships.
• Excellent communication and the ownership to run a workstream end to end: design, implement, test, deploy, operate on-call, and iterate.

Responsibilities

• Design, develop, and maintain Node.js and TypeScript services for account creation, identity verification, agreement handling, and funding hand-off.
• Build event-driven processing that moves applicant data between internal systems and external providers.
• Own correctness in long-running, multi-step flows with idempotency, retries, and deduplication.
• Design and evolve background task runners and job orchestration for downstream account creation and decisioning.
• Build tooling to diagnose stalled applications, including in-flight state inspection and safe requeue.
• Define SLAs and monitoring for flows you own, surfacing provider failures and drop-off risks.
• Design scalable, resilient service architecture using Google Cloud Platform and Kubernetes.
• Extend onboarding to new markets and brands with configurable jurisdiction-specific behavior.
• Coordinate technical direction with adjacent squads and mentor junior engineers.

Skills

Node.js & TypeScript

Event-driven architecture

SQL

Docker & Kubernetes

AI coding agents

Communication & ownership

Education

CS / Software Engineering degree

Tools

Kafka

Google Cloud Pub/Sub

Job description

NinjaTrader is seeking a Senior Backend Engineer to design, develop, and operate backend services in production. You’ll build Node.js and TypeScript systems for account creation, verification, and funding hand‑offs, leveraging event-driven patterns across queues and streaming platforms.

You’ll own multi-step flows, idempotency, and resilient orchestration while collaborating with cross‑functional teams in a hybrid Chicago-based role.