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Hi, I’m Tarun Singh, a Senior Full Stack .NET Developer with 5+ years of experience building healthcare applications using C#, .NET Framework 4.8, Angular, TypeScript, and SQL Server. I specialize in EMR/EHR integrations, FHIR and SMART on FHIR APIs, and secure interoperability solutions. I enjoy turning complex requirements into clean architectures and delivering features end-to-end from design through production support. I have strong Azure and AWS experience, extensive CI/CD automation with Azure DevOps, and a passion for HIPAA-compliant, high-volume systems. I emphasize SOLID principles, clean code, and collaboration with cross-functional teams to build scalable, reliable healthcare platforms that empower clinicians and patients.…Hi, I’m Tarun Singh, a Senior Full Stack .NET Developer with 5+ years of experience building healthcare applications using C#, .NET Framework 4.8, Angular, TypeScript, and SQL Server. I specialize in EMR/EHR integrations, FHIR and SMART on FHIR APIs, and secure interoperability solutions. I enjoy turning complex requirements into clean architectures and delivering features end-to-end from design through production support. I have strong Azure and AWS experience, extensive CI/CD automation with Azure DevOps, and a passion for HIPAA-compliant, high-volume systems. I emphasize SOLID principles, clean code, and collaboration with cross-functional teams to build scalable, reliable healthcare platforms that empower clinicians and patients.

Tarun Singh

Full Stack Developer, Web Developer, Front-End Developer, +2

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Hi, I’m Tarun Singh, a Senior Full Stack .NET Developer with 5+ years of experience building healthcare applications using C#, .NET Framework 4.8, Angular, TypeScript, and SQL Server. I specialize in EMR/EHR integrations, FHIR and SMART on FHIR APIs, and secure interoperability solutions. I enjoy turning complex requirements into clean architectures and delivering features end-to-end from design through production support. I have strong Azure and AWS experience, extensive CI/CD automation with Azure DevOps, and a passion for HIPAA-compliant, high-volume systems. I emphasize SOLID principles, clean code, and collaboration with cross-functional teams to build scalable, reliable healthcare platforms that empower clinicians and patients.…Hi, I’m Tarun Singh, a Senior Full Stack .NET Developer with 5+ years of experience building healthcare applications using C#, .NET Framework 4.8, Angular, TypeScript, and SQL Server. I specialize in EMR/EHR integrations, FHIR and SMART on FHIR APIs, and secure interoperability solutions. I enjoy turning complex requirements into clean architectures and delivering features end-to-end from design through production support. I have strong Azure and AWS experience, extensive CI/CD automation with Azure DevOps, and a passion for HIPAA-compliant, high-volume systems. I emphasize SOLID principles, clean code, and collaboration with cross-functional teams to build scalable, reliable healthcare platforms that empower clinicians and patients.

Available to hire

Hi, I’m Tarun Singh, a Senior Full Stack .NET Developer with 5+ years of experience building healthcare applications using C#, .NET Framework 4.8, Angular, TypeScript, and SQL Server. I specialize in EMR/EHR integrations, FHIR and SMART on FHIR APIs, and secure interoperability solutions. I enjoy turning complex requirements into clean architectures and delivering features end-to-end from design through production support.

I have strong Azure and AWS experience, extensive CI/CD automation with Azure DevOps, and a passion for HIPAA-compliant, high-volume systems. I emphasize SOLID principles, clean code, and collaboration with cross-functional teams to build scalable, reliable healthcare platforms that empower clinicians and patients.

Skills

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Work Experience

.Net Developer at Express Scripts

February 1, 2025 - Present

Led migration planning for AP & UK applications to Microsoft Azure using rehosting, refactoring, and repurchasing strategies. Owned end-to-end feature delivery across healthcare applications from design to development, testing, deployment, and production support. Built and maintained RESTful APIs and backend services using ASP.NET Web API and Entity Framework; developed full-stack solutions with C#, .NET Framework 4.8, Angular 17+, TypeScript, HTML5, and CSS3. Designed cloud-native components using Azure Functions, App Services, Service Bus, and Azure Storage; implemented secure secret and certificate management with Azure Key Vault and App Configuration. Integrated APIs with Azure API Management and enforced secure access patterns. Wrote unit and frontend tests; monitored performance with Azure Application Insights and resolved bottlenecks. Enforced coding standards, conducted peer reviews, and adhered to SOLID principles and clean architecture. Implemented CI/CD pipelines with Azure

.Net Developer at Optum, Inc.

September 1, 2018 - December 1, 2022

Developed and maintained full-stack .NET applications powering core healthcare operations, including claims processing, member eligibility, and provider search. Built EMR/EHR workflow integrations and RESTful FHIR-based APIs to exchange patient demographics, encounters, and clinical data; developed SMART on FHIR apps with OAuth 2.0/OpenID Connect. Implemented HIPAA-compliant security controls (encryption, RBAC, auditing). Optimized SQL Server and PostgreSQL queries, indexes, and execution plans, improving API response times by up to 40%. Created unit and integration tests with NUnit and xUnit; deployed services on Azure and AWS with CI/CD using Azure DevOps. Migrated monoliths to microservices on AWS (EC2, S3, SNS, SQS) and integrated PostgreSQL with .NET Core. Implemented secure identity microservices with OAuth2.0/SSO for cross-platform access. Built front-end components with React and TypeScript; contributed to dashboards with Power BI. Worked in Agile teams with product owners, QA,