Open to opportunities

Marcel Olszewski

@marcelolszewski

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Experienced .NET Software Developer specializing in scalable solutions.

Poland

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What I'm looking for

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

As a .NET Software Developer with over 12 years of experience, I specialize in crafting clean, scalable solutions primarily in the healthcare and e-commerce sectors. My expertise lies in C#, ASP.NET, Python, and modern front-end technologies like React and Angular. I am committed to delivering high-quality, maintainable solutions through Clean Code, Clean Architecture, and Agile methodologies.

Throughout my career, I have successfully led projects that significantly improved platform stability and user engagement. For instance, at AdaHealth, I spearheaded the development of an AI-powered healthcare management system that enabled secure access to licensed therapists for over 100,000 users. My focus on optimizing performance and enhancing user experience has consistently resulted in measurable improvements, such as a 40% increase in platform stability and a 60% boost in release velocity through CI/CD pipelines.

I thrive in collaborative environments, working closely with product managers and clinical directors to refine platform features while ensuring compliance with industry standards like HIPAA and FHIR. My goal is to continue leveraging my technical skills and leadership experience to drive innovation and deliver impactful solutions.

Experience

Work history, roles, and key accomplishments

Current

Senior .NET Full Stack Engineer

Current

AdaHealth

Jul 2019 - Present (6 years 1 month)

Spearheaded an AI-powered healthcare management system using C#, ASP.NET Core, React.js and Entity Framework, enabling 24/7 secure access to licensed therapists for over 100,000 active users and improving platform stability by 40%. Refactored the legacy monolithic backend into a microservices-based architecture using .NET 8, Azure Kubernetes Service (AKS), and Ocelot API Gateway, enhancing scalabi

C#ASP.NET Core React Entity Framework Microservices Azure Kubernetes Service OAUTH2 RESTful APIs SignalR Dapper Python Domain Driven Design CI CD HIPAA)FHIR

.NET Software Developer

BHG Group

Jun 2016 - Present (9 years 2 months)

Engaged in product catalog management features using ASP.NET Core for backend APIs and React.js for the frontend UI, improving admin efficiency by 40% and reducing product onboarding time. Achieved a mobile-first, responsive shopping interface using React.js, TypeScript, and Material-UI, incorporated with RESTful APIs, increasing session duration and user engagement by 25%.

ASP.NET Core React TypeScript Material UI RESTful APIs Stripe PayPal SignalR Elasticsearch Azure DevOps GitHub Actions)Docker Kubernetes Agile

Software Developer

Andersen

Jan 2013 - Present (12 years 7 months)

Contributed to web applications using React, Redux, and TailwindCSS, employing state management to seamlessly handle intricate user interactions, resulting in a 40% decrease in rendering times for extensive datasets. Orchestrated adaptive, mobile-first user interfaces leveraging TailwindCSS, accelerating development and ensuring consistent cross-platform functionality and design fluidity.

React Redux TailwindCSS Kotlin RESTful APIs Agile State Management Mobile Development

Education

Degrees, certifications, and relevant coursework

University of Warsaw

Bachelor of Science, Computer Science

Studied Computer Science at the University of Warsaw from March 2008 to November 2012. Gained foundational knowledge in various aspects of computer science.