Wynshop - Enterprise Multi-Retailer E-Commerce Platform

Distributed Microservices (.NET + Kubernetes + GCP)

About

Production-grade enterprise e-commerce platform serving major grocery retailers (Meijer, Brookshires, Lunds & Byerlys, Foodland, Musgrave) across North America and Europe. 77 repositories, 30+ core microservices, 4 API gateways, 5 payment providers, 129 shared NuGet packages, orchestrated via Kubernetes.

Outcomes & Impact

My Role

Senior Software Engineer working across the full platform: writing integration tests for search services (77% line coverage), migrating services from .NET 8/9 to .NET 10, upgrading EventStore from TCP to gRPC, and maintaining microservices across search, payments, fulfillment, loyalty, and delivery domains.

Core Capabilities

• 77 repositories with 30+ core microservices and 4 API gateways
• Event-driven architecture with MassTransit + RabbitMQ and EventStore (event sourcing)
• Customer domain: CRUD, ElasticSearch/OpenSearch indexing, GDPR anonymization sagas, DDD with MongoDB
• Commerce: checkout with ETag optimistic concurrency, JSON Patch, multi-payment orchestration
• Search: ElasticSearch/OpenSearch product search, autocomplete, spell correction, faceted filtering
• 5 payment integrations: Stripe, Square, Adyen, PayPal, FreedomPay
• Fulfillment: real-time order lifecycle, driver tracking, delivery scheduling
• 129 shared NuGet packages for cross-service consistency
• 14 QA test suites with Playwright, Appium, Gatling, SpecFlow

Architecture

• .NET Core / .NET 8-10 (C#), ASP.NET Core Web API, CQRS, DDD, Saga Pattern
• MassTransit + RabbitMQ for messaging, EventStore for event sourcing (gRPC migration)
• MongoDB + ElasticSearch/OpenSearch + Redis + SQL Server
• Google Cloud Platform (GCS, BigQuery, Pub/Sub, Secret Manager, IAP)
• Docker (102 Dockerfiles), Kubernetes + Helm Charts (20+)
• Prometheus + Grafana monitoring, OpenTelemetry + Jaeger tracing
• Polly circuit breakers, GrowthBook feature flags, SonarCloud code quality

Tech Stack