Full Stack Engineer

### About the Role Join 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 Do * Lead 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 layers, error handling, and system boundaries. * Strengthen CI/CD and release processes to reduce production risk. * Build internal tools and scripts that improve debugging efficiency and engineering velocity. * Partner closely with product and engineering to drive platform-level improvements. ### What We're Looking For **Required:** * 3–7+ years of engineering experience, including time at a startup and exposure to systems at scale. * Strong production debugging skills — able to trace issues across iOS, backend, database, and AWS layers. * Deep experience building and improving backend services in **Node.js and TypeScript**. * Solid understanding of **MongoDB** performance, indexing, and data modeling. * Hands-on experience operating and optimizing systems in AWS environments. * High ownership mentality with clear, structured communication in fast-moving environments. * Based in or willing to relocate to **New York City**. **Nice to Have:** * Comfort navigating and contributing to **Swift and SwiftUI** codebases. * Background in fintech or payments. * Strong CS fundamentals. ### Compensation & Benefits * **Salary:** $170,000 – $220,000 per year * Equity participation in a well-funded, high-growth fintech startup * Visa sponsorship available ### Location This is an **on-site role based in New York City, NY**. Candidates must be located in NYC or willing to relocate. Find [Jobs in United Kingdom](https://www.arbeitnow.co.uk) on Arbeitnow