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Justin O'hara

@justinohara

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Senior Full Stack Developer with 12 years of experience.

United States

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What I'm looking for

I am looking for a role that fosters innovation, collaboration, and growth opportunities.

I am a Full Stack Developer with over 12 years of experience in defining, designing, developing, maintaining, and optimizing scalable enterprise applications. My expertise lies in C#, .NET Core, Angular, React, and cloud services like AWS and Azure. I focus on building high-performance and secure systems, utilizing a test-driven development (TDD) approach and Agile methodologies to deliver maintainable solutions.

Throughout my career, I have successfully designed and built a scalable Electronic Health Record (EHR) system, contributing to a 29% increase in overall system performance and a 23% reduction in response time latency. My experience includes creating responsive user interfaces, developing backend services, and implementing microservices-based architectures. I have also led teams, mentoring developers and fostering collaboration to enhance project delivery.

My commitment to continuous learning and professional development drives me to stay updated with the latest technologies and best practices in the industry. I am passionate about leveraging my skills to create impactful solutions that improve user experiences and drive business success.

Experience

Work history, roles, and key accomplishments

Senior Full Stack Engineer

Aspirus Health

Feb 2020 - May 2025 (5 years 3 months)

Designed, built, and enhanced a scalable Electronic Health Record (EHR) system using C#, .NET Core, and Angular/React, meeting rigorous healthcare industry requirements. Optimized system performance by 29% and reduced response time by 23% through architectural decisions and SQL query tuning, while leading and mentoring a development team.

C++.NET Core Angular React Azure Microservices SQL Server GraphQL Kafka Agile

Full Stack Developer

Boston Consulting Group

Jun 2016 - Dec 2019 (3 years 6 months)

Assisted in developing a wealth management dashboard using ASP.NET MVC and React, providing a responsive interface for clients to explore financial data. Built C# and .NET Framework server-side functionality to integrate real-time market data and implemented secure user authentication with ASP.NET Identity.

ASP.NET MVC React C++.NET Framework SQL Server REST APIs Agile Unit Testing

Junior Software Developer

PKWARE.Inc

Aug 2013 - May 2016 (2 years 9 months)

Assisted in designing, developing, and testing key application features using C#, .NET Core, and SQL, enhancing product robustness. Participated in resolving UI issues and designing user-friendly interfaces with AngularJS, which increased user satisfaction by 24%.