Full Stack Engineer

About the RoleJoin a lean, four-person engineering team at a fast-growing Series A fintech startup building an AI-powered investing platform targeted at the next generation of investors. With millions of downloads and a rapidly scaling user base, this is a high-ownership, hands-on role at a critical inflection point in the company's growth.You'll own the technical foundation across iOS, Node.js backend services, and AWS infrastructure — reporting directly to the Head of Engineering from our New York City office. Visa sponsorship is available.What You'll DoLead deep investigations into complex production issues spanning iOS, backend services, and cloud infrastructure.Perform root-cause analysis across API layers, async workflows, data models, third-party integrations, and infrastructure.Improve backend service reliability, correctness, and performance in Node.js and TypeScript.Optimize MongoDB queries, indexes, and data access patterns for performance at scale.Strengthen AWS infrastructure stability across Elastic Beanstalk, EC2, deployments, and monitoring.Improve observability using structured logging, metrics, and CloudWatch.Reduce recurring bug classes by improving validation la