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I am a Senior .NET Engineer with 9 years of experience delivering HIPAA-compliant healthcare and fintech systems using C#/.NET (ASP.NET Core Web API), microservices, and event-driven architectures on Azure. I optimize for performance, reliability, and availability, leveraging AKS/Kubernetes, SQL Server, EF Core, and Dapper to scale APIs and data processing. I collaborate closely with product, QA, and DevOps, lead an Agile team of developers, and have a proven record of delivering secure, maintainable software with modern CI/CD pipelines, OAuth, and robust testing. I enjoy solving complex problems and driving continuous improvement in fast-paced environments.…I am a Senior .NET Engineer with 9 years of experience delivering HIPAA-compliant healthcare and fintech systems using C#/.NET (ASP.NET Core Web API), microservices, and event-driven architectures on Azure. I optimize for performance, reliability, and availability, leveraging AKS/Kubernetes, SQL Server, EF Core, and Dapper to scale APIs and data processing. I collaborate closely with product, QA, and DevOps, lead an Agile team of developers, and have a proven record of delivering secure, maintainable software with modern CI/CD pipelines, OAuth, and robust testing. I enjoy solving complex problems and driving continuous improvement in fast-paced environments.

SHAWN JOSEPH

Full Stack Developer, Web Developer, Back-End Developer, +5

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I am a Senior .NET Engineer with 9 years of experience delivering HIPAA-compliant healthcare and fintech systems using C#/.NET (ASP.NET Core Web API), microservices, and event-driven architectures on Azure. I optimize for performance, reliability, and availability, leveraging AKS/Kubernetes, SQL Server, EF Core, and Dapper to scale APIs and data processing. I collaborate closely with product, QA, and DevOps, lead an Agile team of developers, and have a proven record of delivering secure, maintainable software with modern CI/CD pipelines, OAuth, and robust testing. I enjoy solving complex problems and driving continuous improvement in fast-paced environments.…I am a Senior .NET Engineer with 9 years of experience delivering HIPAA-compliant healthcare and fintech systems using C#/.NET (ASP.NET Core Web API), microservices, and event-driven architectures on Azure. I optimize for performance, reliability, and availability, leveraging AKS/Kubernetes, SQL Server, EF Core, and Dapper to scale APIs and data processing. I collaborate closely with product, QA, and DevOps, lead an Agile team of developers, and have a proven record of delivering secure, maintainable software with modern CI/CD pipelines, OAuth, and robust testing. I enjoy solving complex problems and driving continuous improvement in fast-paced environments.

Available to hire

I am a Senior .NET Engineer with 9 years of experience delivering HIPAA-compliant healthcare and fintech systems using C#/.NET (ASP.NET Core Web API), microservices, and event-driven architectures on Azure. I optimize for performance, reliability, and availability, leveraging AKS/Kubernetes, SQL Server, EF Core, and Dapper to scale APIs and data processing.

I collaborate closely with product, QA, and DevOps, lead an Agile team of developers, and have a proven record of delivering secure, maintainable software with modern CI/CD pipelines, OAuth, and robust testing. I enjoy solving complex problems and driving continuous improvement in fast-paced environments.

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Work Experience

Senior Software Engineer at HealthyJoy

October 1, 2025 - October 1, 2025

Led a 15% performance upgrade of a legacy management system by migrating from ASP.NET Web Forms to ASP.NET Core, EF 6, and Angular 14; implemented microservices for Identity with AWS IAM/SSO; optimized T-SQL; modernized desktop support; improved security with OAuth2/JWT; upgraded UI and automated testing and CI/CD pipelines; led globally distributed teams.

Senior Software Engineer at Spirion

August 31, 2021 - August 31, 2021

Converted a legacy VB.NET monolith into microservices using C#, ASP.NET, MS SQL Server, RabbitMQ and AWS; achieved 10% overall performance gains and 40% reduction in AWS infrastructure costs through architectural simplification; enhanced backend processes with PL/SQL components and improved deployment/testing through established CI/CD practices.

Backend Engineer at Gooee

April 1, 2020 - April 1, 2020

Crafted 5+ web/desktop applications using C#, ASP.NET, Web Forms, WPF and WCF; implemented serverless components with AWS Lambda; front-end built with Angular/Ionic; redesigned legacy credit reporting using Node.js, GraphQL, Angular and .NET; established a TDD-friendly framework with DI and a generic repository; contributed to Scrum-based development.

Senior Software Engineer at HealthyJoy

August 1, 2021 - October 1, 2025

Spearheaded a 15% overall performance upgrade of a Legacy Management System migrating from ASP.NET Web Forms to ASP.NET Core, Entity Framework 6, Angular 14, LINQ and SSRS following Test-Driven Development and Agile methodology. Implemented Microservice architecture with REST and AWS for Identity microservices using AWS IAM and AWS SSO. Optimized complex T-SQL queries and stored procedures for the Medical Research Data Repository, reducing query response time by 40%. Engineered generating over 50 resource XAML files to support legacy desktop apps while modernizing Pharmacy System. Strengthened security with AWS IAM, OAuth 2.0 and JWT. Migrated AngularJS modules to Angular 14 with RxJS-based caching and Kendo UI for a 100k+ user patient portal. Created unit and automated tests (Jasmine, Karma, Cypress) achieving 95% test coverage. Automated CI/CD pipelines using GitHub, Jenkins, AWS CodePipeline and Elastic Beanstalk; managed Jira-based Agile processes; led 3 globally distributed teams

Senior Software Engineer at Spirion

June 1, 2020 - August 31, 2021

Converted a legacy VB.NET monolithic platform into microservices using C#, ASP.NET, MS SQL Server, RabbitMQ and AWS, delivering a 10% overall performance upgrade. Reduced AWS infrastructure costs by 40% through architectural simplification and resource optimization. Developed ASP.NET MVC services with validations, security, logging and multi-threading, resulting in a 20% improvement in CPU utilization and support for distributed SOA apps. Built a robust AngularJS frontend with two-way data binding, cutting loading times by 30% and boosting overall performance by 20%. Transitioned policy-issuing system from WPF to ASP.NET MVC for beta version, maintaining automation testing with Cypress and NUnit. Leveraged AWS technologies (EKS, CloudFront, CloudFormation, CloudWatch, DynamoDB) to enhance scalability and performance. Followed Scrum; integrated GitHub, AWS CodePipeline, Jenkins and Elastic Beanstalk to create deployment pipelines; tracked 20+ defects via Jira/Confluence.

Backend Engineer at Gooee

October 1, 2017 - April 1, 2020

Crafted 5+ web and desktop applications using C#, ASP.NET, Web Forms, WPF and WCF; designed serverless architecture with AWS Lambda. Implemented frontend using Angular, Ionic Framework (Angular2), TypeScript, Jasmine, Protractor, ES6, Firebase and Angular Material. Led revamp of legacy credit reporting projects using Node.js, GraphQL, Angular and .NET; wrote unit tests with Mocha and NUnit. Designed TDD-friendly framework with Dependency Injection (Unity) and a generic repository to support scalable development. Followed Scrum methodology.

Senior Net Engineer at HealthJoy

August 1, 2021 - December 1, 2025

Led HIPAA-focused system improvements across C#/.NET Core APIs and Azure-based services. Redesigned patient intake workflows with async processing (Azure Functions) and Service Bus, reducing processing time by 45%. Implemented idempotency, validation, and resilient retries to lower claim submission failures by 28%. Enhanced HL7 parsing and dead-letter replay tooling to achieve 99.9% lab result ingestion. Optimized FHIR API throughput (2.3x) via EF Core tuning, targeted Dapper queries, and SQL Server indexing. Migrated workloads to AKS with readiness/liveness probes and zero-downtime deployments, increasing platform availability to 99.95%. Led a 7-member Agile team and promoted TDD/BDD and robust CI/CD practices.

Full Stack Net Developer at Spirion

May 1, 2020 - August 1, 2021

Modernized a legacy payments platform by decomposing monoliths into microservices using C#/.NET Core and ASP.NET MVC/Web API, achieving ~15% performance gains while maintaining SOC2-aligned security. Built Angular-based payment workflows and dashboards; implemented AWS Docker/Kubernetes (EKS) deployments with rolling updates and config/secrets management, plus Lambda for event-driven automation. Optimized PostgreSQL/MySQL performance (query tuning, indexing) delivering up to 40% faster transactions. Strengthened CI/CD with automated pipelines and expanded unit/regression testing, cutting cycle time by ~50%.

Net Developer at Gooee

October 1, 2017 - April 1, 2020

Developed admin portal with Kendo UI and published 5+ C#/.NET SDKs for Stripe integrations to improve developer experience. Implemented event-driven processing using DDD, Sagas, CQRS projections with MongoDB and Azure Service Bus. Delivered web/desktop solutions across ASP.NET Web Forms, WPF, WCF, and Angular/Ionic, supporting modernization with Node.js/GraphQL; emphasized TDD and DI.

Senior .NET Engineer at HealthJoy

August 1, 2021 - December 1, 2025

Led architecture redesign of patient intake workflows in C# ASP.NET Core Web API (.NET 8/9), introducing async processing with Azure Functions to reduce processing time by 45%. Implemented idempotent RESTful services, validation, and resilient retries using Azure Service Bus, cutting claim submission failures by 28%. Improved HL7 parsing and dead-letter/replay tooling to achieve 99.9% lab result ingestion. Optimized FHIR API throughput by improving EF Core tracking, using Dapper queries, and tuning SQL Server indexes (2.3x throughput, 38% latency reduction). Designed versioned APIs with backward-compatible contracts, enabling faster integration. Implemented OAuth-based authentication/authorization, reducing unauthorized access by 40% and improving login speed by 30%. Delivered a responsive React/Angular SPA to reduce clinician time-to-chart by 25% and supported AI-assisted development. Increased platform availability from 99.5% to 99.95% via AKS, probes, HPA, and blue/green/rolling dep

Full Stack .NET Developer at Spirion

May 1, 2020 - August 1, 2021

Modernized a legacy payments platform with C#/.NET Core, ASP.NET MVC/Web API, delivering +15% performance while maintaining SOC2 controls. Built Angular payment workflows and dashboards, collaborating with Product/QA/DevOps in Agile/Scrum. Designed and documented REST API contracts, reducing integration friction and cutting development cycle time by 25%. Decomposed monolithic components into microservices using SOLID, Repository/Service/Factory patterns, enabling 50% faster time-to-market. Optimized PostgreSQL/MySQL performance (up to 40% faster queries) and improved .NET service performance (p95 from 900ms to 600ms). Delivered AWS deployments with Docker and Kubernetes (EKS), including rolling deployments and Lambda for event-driven automation. Improved CI/CD pipelines, standardizing builds and tests, reducing cycle time by 50% and deployment time by 20%. Led code reviews, mentoring, and RCA.