Full Stack Engineer

<h3>About the Role</h3><p style="min-height:1.5em">Join a lean, four-person engineering team at a fast-growing <strong>Series A fintech startup</strong> 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.</p><p style="min-height:1.5em">You'll own the technical foundation across iOS, Node.js backend services, and AWS infrastructure — reporting directly to the Head of Engineering from our <strong>New York City office</strong>. Visa sponsorship is available.</p><h3>What You'll Do</h3><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Lead deep investigations into complex production issues spanning iOS, backend services, and cloud infrastructure.</p></li><li><p style="min-height:1.5em">Perform root-cause analysis across API layers, async workflows, data models, third-party integrations, and infrastructure.</p></li><li><p style="min-height:1.5em">Improve backend service reliability, correctness, and performance in <strong>Node.js and TypeScript</strong>.</p></li><li><p style="min-height:1.5em">Optimize <strong>MongoDB</strong> queries, indexes, and data access patterns for performance at scale.</p></li><li><p style="min-height:1.5em">Strengthen AWS infrastructure stability across Elastic Beanstalk, EC2, deployments, and monitoring.</p></li><li><p style="min-height:1.5em">Improve observability using structured logging, metrics, and CloudWatch.</p></li><li><p style="min-height:1.5em">Reduce recurring bug classes by improving validation layers, error handling, and system boundaries.</p></li><li><p style="min-height:1.5em">Strengthen CI/CD and release processes to reduce production risk.</p></li><li><p style="min-height:1.5em">Build internal tools and scripts that improve debugging efficiency and engineering velocity.</p></li><li><p style="min-height:1.5em">Partner closely with product and engineering to drive platform-level improvements.</p></li></ul><h3>What We're Looking For</h3><p style="min-height:1.5em"><strong>Required:</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">3–7+ years of engineering experience, including time at a startup and exposure to systems at scale.</p></li><li><p style="min-height:1.5em">Strong production debugging skills — able to trace issues across iOS, backend, database, and AWS layers.</p></li><li><p style="min-height:1.5em">Deep experience building and improving backend services in <strong>Node.js and TypeScrip...

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