Open to opportunities

Leonard User

@leonarduser4

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Senior Software Engineer specializing in cloud-native .NET platforms, scalable microservices, and Azure-based SaaS.

United States

Message

What I'm looking for

I seek senior backend/cloud roles where I can lead cloud-native .NET platform development, drive reliability and security, mentor teams, and deliver scalable SaaS solutions.

I am a Senior Software Engineer with 8+ years building high-scale, cloud-native .NET platforms for finance and healthcare. I focus on reliability, performance, and secure-by-default architectures across distributed systems and SaaS products.

I have deep expertise in C#, .NET Core/.NET 8, SQL Server, REST APIs, and event-driven microservices using Azure services such as Functions, App Service, Service Bus, Event Grid, Storage, Key Vault, and AKS. I design CI/CD pipelines, infrastructure as code with Terraform, and observability with Datadog and Application Insights.

I drive measurable impact through performance and reliability improvements—examples include API latency reductions, database performance tuning, and zero-downtime release practices. I mentor engineers in DDD/CQRS, testing strategies, secure API design, and operational best practices.

I seek to contribute technical leadership, hands-on engineering, and cross-team collaboration to deliver secure, scalable systems while fostering continuous improvement and delivery excellence.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

MedCost

Jul 2023 - Dec 2025 (2 years 5 months)

Led backend services for a healthcare SaaS, architecting event-driven microservices and CI/CD pipelines, reducing API latency by 38% and improving DB performance by 25% while ensuring HIPAA-aligned security.

C++Azure Service Bus Event Grid SQL Server EF Core Terraform Datadog CI CD

Software Engineer

GreenDot

Aug 2020 - Jul 2023 (2 years 11 months)

Developed fintech microservices for payments and account management with messaging patterns, introduced structured logging/tracing, and reduced reconciliation defects by ~30% through performance tuning and reliable deployments.

C++.NET Core RabbitMQ Azure Service Bus SQL Server Docker Azure DevOps GitHub Actions

Software Engineer

Ford

May 2017 - Aug 2020 (3 years 3 months)

Built enterprise web applications and REST services for manufacturing/logistics, modernized legacy MVC to .NET Core, and improved reporting performance by 40% while enhancing telemetry and release automation.

C++.NET Core SQL Server Jenkins