Sr. Software Engineer II, Platform​/API Chicago or Remote

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Welcome to the dynamic world of Ninja Trader! As an industry-leading trading platform and futures broker, we're empowering traders to take control of their financial destiny. How do we do it? We provide cutting‑edge products and services that enhance the trading journey. Whether a seasoned pro or just starting out, Ninja Trader equips traders with award‑winning software and brokerage services to navigate the world's leading financial markets with confidence.

Our growth story is nothing short of exhilarating. Since 2003, Ninja Trader has been dedicated to understanding and supporting traders on their journey toward trading triumph. Through those efforts, our user base has grown to over 2 million users and we have become the number one rated futures brokerage worldwide.

But we're not stopping there. We're constantly evolving, pushing boundaries, and modernizing the futures industry. Our commitment to innovation means users will always have access to dynamic tools, real‑time support, and a community of like‑minded traders.

So, why work at Ninja Trader? Here, you're not just part of a team; you're part of a movement. We empower employees to reach new heights in their careers by providing a dynamic culture focused on social connection, professional development, and employee recognition initiatives. Sounds too good to be true? Take it from our employees.

Join us as we redefine what's possible in trading, advocate for our customers, and continue our journey toward becoming the world's top retail‑focused trading platform in the world.

Ninja Trader is investing in the platform that takes a prospective trader from initial sign‑up to funded and trading, on a modern Node.js and Type Script service architecture. We're hiring a Sr. Software Engineer II to own the service layer it runs on.

You'll own how those services are designed, deployed, and operated: event‑driven orchestration, background processing, third‑party integrations, and the reliability engineering that keeps a multi‑step flow dependable  a senior engineer on the Activation & Onboarding squad, your work will significantly impact account approvals, time‑to‑funding, and how quickly we can open the platform to new markets.

• Design, develop, and maintain Node.js and Type Script services that orchestrate account creation, identity verification, agreement handling, and funding hand‑off
• Build the event‑driven and asynchronous processing that moves applicant and verification data between internal systems and outside providers, using message queues, pub/sub, and streaming pipelines
• Own correctness in long‑running, multi‑step flows: idempotency, retry and resumption semantics, deduplication, and reconciliation for steps that cannot simply be replayed
• Design and evolve the background task runners and job orchestration that drive downstream account creation and decisioning
• Build the operational tooling the squad needs when an application stalls mid‑flow: inspection of in‑flight state, targeted replay, and safe requeue
• Define service‑level expectations for the flows you own, along with the monitoring and alerting that surface provider failures and applicant drop‑off before a customer reports them
• Design and implement scalable, resilient service architecture, using cloud‑based infrastructure such as Google Cloud Platform and Kubernetes
• Extend onboarding to new markets,…