Senior Node.js Developer (USA time zone)

About the Role:

We are looking for a Senior Backend Engineer to own a risk intelligence and B2B delivery platform at the core of a next-generation futures trading brokerage. This is a full-ownership role — you will design, build, maintain, and improve two tightly coupled services responsible for per-tenant risk execution and multi-protocol client delivery.

What You Will Work On:

• Per-tenant risk algorithm execution, liquidation workflows, and simulation configuration management;
• REST, gRPC, and WebSocket delivery to B2B clients with per-tenant webhook dispatch and outcome configuration;
• NATS JetStream integration: subscribing to risk alerts and position streams, managing backpressure and audit trail integrity;
• Coordination with upstream Rust services and a Python intelligence layer (classification models, surveillance);
• Evolving a unifying backend layer as the platform scales.

Required Skills:

• 5+ years of backend engineering with production systems at scale;
• Strong proficiency in NestJS / TypeScript and the Node.js ecosystem;
• Solid understanding of event-driven architecture (NATS JetStream, Kafka, or Pulsar);
• Experience designing multi-protocol APIs (REST, gRPC, WebSocket) in a B2B context;
• Familiarity with per-tenant SaaS patterns: isolation, config management, webhook delivery;
• Comfort working adjacent to Rust and Python services;
• PostgreSQL 17 + Timescale, Redis 7, S3 Object Lock, audit-grade data patterns (immutable logs, dual-write);
• Strong async written communication skills for a remote-first team.

Nice to Have:

• Background in fintech, trading infrastructure, or trading firm operations;
• Familiarity with pre-trade risk concepts: margin limits, fat finger controls, liquidation sequencing;
• Prior work with colocation or latency-sensitive distributed systems.