Senior Software Engineer, Marketplace

This position is ideal for a Senior Fullstack Engineer with 7+ years of experience, including at least 3 years in Ruby on Rails and 2 years in React and TypeScript. Best for those who have built marketplace features or payment systems, especially with Stripe, and are confident with data modeling, scalable architecture, and API design. It's perfect for engineers in the US, Canada, or Mexico who want to work remotely on high-impact, user-centric software.

1. How do you design a scalable marketplace architecture using Rails and React?
   Use service-oriented architecture with clearly defined models and roles, React for dynamic frontends, Rails APIs with serializers, and background jobs for async tasks like payments or notifications.

2. How do you ensure data integrity and performance when dealing with transactions and billing workflows?
   Implement database constraints, validations, ACID-compliant operations, use PostgreSQL features like transactions and locks, and monitor performance with indexing and query profiling.

3. What’s your experience integrating with payment systems like Stripe in a Rails application?
   Use the Stripe Ruby SDK for charges, subscriptions, and webhooks; secure endpoints, validate payloads, and log transaction states for audits.

4. How do you manage state and asynchronous interactions in React with TypeScript?
   Use hooks like useReducer or useContext for state, async functions with fetch or Axios, handle loading/error states, and define clear TypeScript interfaces for API responses.

5. What are key challenges in building a vendor-customer marketplace, and how would you address them?
   Balance trust and control (e.g., approval workflows), manage payment disputes, ensure accurate data syncing, and implement role-based permissions and audit trails.

6. How do you collaborate with Product, Design, and QA in feature planning and delivery?
   Participate in discovery meetings, provide technical feedback on feasibility, create shared specs, and use staging environments for early QA and demo feedback.

7. Describe your approach to testing Rails and React components.
   Use RSpec and FactoryBot for backend unit/integration tests, Jest and React Testing Library for frontend, and include end-to-end tests with tools like Cypress.

8. How do you manage deployment and CI/CD for a fullstack app?
   Use GitHub Actions or similar CI tools for linting, tests, and deployment pipelines; apply versioned deployments and feature toggles for risk mitigation.

9. What’s your experience optimizing SQL queries in Rails for large datasets?
   Use includes, select, pluck, and raw SQL when needed, avoid N+1 queries, analyze queries with EXPLAIN, and apply proper indexes and pagination.

10. How do you handle versioning and breaking changes in public-facing APIs?
    Use namespaced routes (e.g., /api/v1/), keep backward compatibility, document with OpenAPI, and communicate deprecations in advance with changelogs.

Fleetio is hiring a Senior Software Engineer to help expand its Marketplace platform, enabling fleet customers to connect with service shops, manage payments, and streamline operations. In this remote role (open to US, Canada, or Mexico), you'll work with Ruby on Rails, ReactJS, and TypeScript to build secure, scalable features. You’ll earn \$156K–\$168K plus equity, enjoy top-tier benefits, and join a culture driven by quality software, collaboration, and continuous growth. Ideal for engineers with 7+ years' experience and a passion for building high-impact marketplace solutions.