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Michael Weiss

@michaelweiss

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Senior Backend Engineer at Chewy who built Go microservices processing over 25M financial transactions daily.

United States

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At Chewy, I designed and launched Go, TypeScript, and Python microservices processing over 25M financial transactions daily. The architecture increased throughput by 40% and reduced latency by 35%.

Earlier, I built Go backend services at Klaviyo and Extreme Networks, and extended the open-source Mainflux IoT platform for environmental monitoring. I’ve also worked on Rust services, cloud infrastructure, and CI/CD pipelines across eCommerce, fintech, and IoT.

Experience

Work history, roles, and key accomplishments

Senior Backend Engineer

Chewy

Nov 2021 - Jul 2026 (4 years 8 months)

Designed and launched high-throughput microservices in Go, Typescript, and Python, processing over 25M financial transactions daily. Built gRPC, GraphQL, and FastAPI services, optimized databases, automated infrastructure with Pulumi, and implemented CI/CD pipelines and observability.

Backend Software Engineer

Klaviyo

Oct 2017 - Sep 2021 (3 years 11 months)

Built Go-based backend services for real-time inventory, payment processing, and loyalty systems, scaling to 1,500+ concurrent users. Developed Rust microservices, secured APIs with OAuth2/JWT/RBAC, optimized databases, and established CI/CD pipelines with GitLab CI.

Go Rust OAuth JWT RBAC Oracle 12C MongoDB RabbitMQ Grafana PostgreSQL DynamoDB Docker Amazon EKS ECR Gitlab CI Prometheus AlertManager Kafka NATS GCP

Backend Developer

Extreme Networks

Jun 2013 - Aug 2017 (4 years 2 months)

Engineered Go-based multi-tenant financial dashboards serving 1,000+ daily users with 99.95% uptime. Built TypeScript analytics and fraud-detection services, implemented event-driven architectures, and extended the Mainflux IoT platform.

Go PostgreSQL DynamoDB Elasticsearch TypeScript Kafka NATS GCP Pulumi Jenkins Gitlab CI Agile Mainflux NRF Zigbee LoRaWAN C++

Junior Backend Engineer

DLC Consulting

Mar 2010 - May 2013 (3 years 2 months)

Supported migration of legacy PHP and Java systems to Go-based microservices. Assisted in developing TypeScript microservices, containerized applications with Docker, and automated deployments on AWS using Pulumi.