Connor Simoni

I've built reliable backend services and APIs for Fidelity Investments, Toast, and Wayfair, supporting financial services, restaurant management, and e-commerce platforms.

At Fidelity Investments, I develop secure, highly available services, integrate internal systems through REST APIs and event-driven workflows, and help deploy machine learning models into production. I also maintain CI/CD pipelines, document architecture patterns, resolve production issues, and mentor junior engineers.

At Toast, I built high-volume transaction services, third-party integrations, message-queue workflows, and monitoring for critical systems. I improved robustness through webhooks, retry logic, error handling, database optimization, and asynchronous processing.

Earlier at Wayfair and HubSpot, I developed web applications, RESTful APIs, data-processing features, internal automation tools, tests, and integrations with external services. My work spans Python, Java, JavaScript, TypeScript, cloud tooling, machine learning, and production reliability.