Senior Software Engineer

Summary: We're looking for a Senior Software Engineer to join our engineering team and take ownership of complex, high-impact projects across the stack. You'll design and build scalable backend services in Node.js on GCP Cloud Run, with MongoDB as the primary datastore, while also contributing to front-end experiences built with React and React Router. As a senior member of the team, you'll be expected to write high-quality, maintainable code, make sound architectural decisions, mentor other engineers, and help set technical direction — all while balancing security, performance, and scalability as first-class concerns. This role touches everything from API integration work and UI component development to CI/CD collaboration and secure coding practices.

Responsibilities: Design, build, and maintain Node.js microservices deployed on GCP Cloud Run Build and integrate REST APIs across a variety of sources — including our own services, third-party platforms, and client-specific APIsModel and query data in MongoDB, with an eye toward performance and scalability Build reusable, well-structured React UI components and maintain front-end features using React Router Write and maintain unit tests for new and existing code, and help establish code coverage standards as part of our CI/CD pipeline Design services with security and scalability as first-class concerns (authentication, authorization, input validation, rate limiting, secrets management, horizontal scaling)Write secure code by default, following best practices for dependency and vulnerability management Collaborate on CI/CD workflows and vulnerability management processes Support integrations with third-party platforms and vendors (e.g., Shopify Admin/Flow/GraphQL APIs, fraud/identity verification services)Participate in load and performance testing (e.g., k 6, Grafana) to validate services under scale Work with Cloudflare, including Cloudflare Workers, for edge compute and request handling where applicable

Requirements: Professional experience building backend services in Node.js Experience with MongoDB (schema design, indexing, performance tuning)Hands-on experience with GCP or a comparable cloud provider Solid understanding of REST API design and integration Front-end experience with React, including building UI components and working with React Router Strong unit testing habits and experience with testing frameworks Demonstrated ability to design for scalability and security (authentication, authorization, input validation, secure secrets handling)Comfortable working across the stack and collaborating with cross-functional teams

Nice to Have: Experience with Cloudflare, especially building or maintaining Cloudflare Workers Experience building or maintaining Shopify apps, Shopify Flow workflows, or Shopify Admin/GraphQL integrations Experience with load/performance testing tools (k 6, Grafana)Experience with SSO implementations (e.g., Multipass-style authentication)Experience with CI/CD pipeline design and maintenance