payments PCI e-commerce

Payment Services - Clean Architecture Payments Platform

Backend (.NET + AWS)

Screenshots coming soon

About

A standalone .NET 5 payment engine structured via Clean Architecture, backed by DynamoDB, Redis, LaunchDarkly, and third-party processors (First Data, Moneris, Amaryllis), with REST API, NuGet client, and AWS Lambda migration tools.

Outcomes & Impact

Payment Processors

Millions

Transactions Handled

Clean Arch

API/App/Domain/Infra

DynamoDB

+ Redis Dedup

My Role

Designed and implemented the Clean Architecture payment platform with separate API/Application/Domain/Infrastructure layers. Implemented charge/authorize/refund flows backed by DynamoDB and Redis with feature-flagged behavior. Integrated multiple processors behind a unified domain model and NuGet client. Built migration tooling on AWS Lambda and EC2 CLI.

Core Capabilities

Mediatr-driven charge/authorize/refund use cases with processor resolution
DynamoDB tables with Base class serialization and Redis duplicate detection
Feature flags (LaunchDarkly) toggling per chain/store/user for compliance and behavior
NuGet client package (PaymentServices.Client) for legacy Monolith consumers
AWS Lambda and EC2 CLI migration tools for SQL-to-DynamoDB data moves

Architecture

Strict Clean Architecture: API, Application, Domain, Infrastructure, Shared layers
CQRS with Mediatr handlers, FluentValidation, and polymorphic JSON converters
DynamoDB per-chain tables, Redis cache, and LaunchDarkly feature flags
AWS CodeDeploy/EC2 auto-scaling with Terraform/Helm infrastructure

Tech Stack

ASP.NET Core 5 Mediatr FluentValidation DynamoDB Redis LaunchDarkly AWS Lambda Terraform Helm Docker

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