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Hi, I’m Jonathan Stevenson, a Senior Full-Stack .NET Developer with over 12 years of experience designing and deploying reliable applications optimized for cloud environments across finance, healthcare, logistics, and cryptocurrency sectors. I specialize in building secure, high-performance systems using C#, ASP.NET Core, EF Core, and Azure, delivering scalable solutions that meet stringent security and regulatory requirements. I enjoy collaborating with product, design, and QA teams to translate business goals into robust, maintainable software. I mentor engineers, advocate for Agile practices, and seek opportunities to optimize delivery through microservices, modern JavaScript frameworks like React and Angular, and automated CI/CD pipelines.…Hi, I’m Jonathan Stevenson, a Senior Full-Stack .NET Developer with over 12 years of experience designing and deploying reliable applications optimized for cloud environments across finance, healthcare, logistics, and cryptocurrency sectors. I specialize in building secure, high-performance systems using C#, ASP.NET Core, EF Core, and Azure, delivering scalable solutions that meet stringent security and regulatory requirements. I enjoy collaborating with product, design, and QA teams to translate business goals into robust, maintainable software. I mentor engineers, advocate for Agile practices, and seek opportunities to optimize delivery through microservices, modern JavaScript frameworks like React and Angular, and automated CI/CD pipelines.

Jonathan Stevenson

Full Stack Developer, Developer, Programmer, +4

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Hi, I’m Jonathan Stevenson, a Senior Full-Stack .NET Developer with over 12 years of experience designing and deploying reliable applications optimized for cloud environments across finance, healthcare, logistics, and cryptocurrency sectors. I specialize in building secure, high-performance systems using C#, ASP.NET Core, EF Core, and Azure, delivering scalable solutions that meet stringent security and regulatory requirements. I enjoy collaborating with product, design, and QA teams to translate business goals into robust, maintainable software. I mentor engineers, advocate for Agile practices, and seek opportunities to optimize delivery through microservices, modern JavaScript frameworks like React and Angular, and automated CI/CD pipelines.…Hi, I’m Jonathan Stevenson, a Senior Full-Stack .NET Developer with over 12 years of experience designing and deploying reliable applications optimized for cloud environments across finance, healthcare, logistics, and cryptocurrency sectors. I specialize in building secure, high-performance systems using C#, ASP.NET Core, EF Core, and Azure, delivering scalable solutions that meet stringent security and regulatory requirements. I enjoy collaborating with product, design, and QA teams to translate business goals into robust, maintainable software. I mentor engineers, advocate for Agile practices, and seek opportunities to optimize delivery through microservices, modern JavaScript frameworks like React and Angular, and automated CI/CD pipelines.

Available to hire

Hi, I’m Jonathan Stevenson, a Senior Full-Stack .NET Developer with over 12 years of experience designing and deploying reliable applications optimized for cloud environments across finance, healthcare, logistics, and cryptocurrency sectors. I specialize in building secure, high-performance systems using C#, ASP.NET Core, EF Core, and Azure, delivering scalable solutions that meet stringent security and regulatory requirements.

I enjoy collaborating with product, design, and QA teams to translate business goals into robust, maintainable software. I mentor engineers, advocate for Agile practices, and seek opportunities to optimize delivery through microservices, modern JavaScript frameworks like React and Angular, and automated CI/CD pipelines.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at ATH Infosystems

July 1, 2022 - Present

Engineered the backend of a transport management system using ASP.NET Core, Entity Framework, and REST APIs to enable real-time driver tracking and automated invoicing for logistics companies. Designed cross-platform mobile and web applications for energy delivery services, streamlining order processing. Directed backend development for telemedicine platforms delivering real-time appointments, e-prescribing, insurance claims, and payment processing, which grew client revenue by 270%. Integrated Azure DevOps CI/CD pipelines, reducing release times by 60%, and collaborated strongly with product managers and QA teams to ensure alignment and quality.

Senior Full Stack Developer at Castle Harlan

June 30, 2022 - July 21, 2025

Built a tailored CRM system for an insurance firm, automating sales cycles, contact management, and integrating third-party services, leading to 35% business growth and full compliance with testing roadmaps. Established an AWS-based cloud banking system supporting virtual cards and open banking APIs for the Nigerian market. Developed a responsive financial trading dashboard with Angular and WebSocket technologies. Mentored a development team on React optimization, C# architecture, and TypeScript standards to improve code quality.

Lead .NET Developer at The Merriman

June 30, 2021 - July 21, 2025

Coached an offshore team in building a healthcare coverage management application with automated eligibility screening and real-time alerts using .NET Core and Azure. Introduced a microservices architecture for telehealth platforms, achieving 99.99% uptime and reducing deployment complexity. Developed a healthcare dashboard processing complex medical data with React, and delivered a HIPAA-compliant patient portal for encrypted access and sensor data tracking, improving response times by 30%. Refactored legacy healthcare software into modular WPF applications, reducing technical debt by 40%.

Full Stack .NET Developer at AtNetPlus

May 31, 2017 - July 21, 2025

Led cloud migration to Azure App Services, reducing infrastructure costs by 30%. Developed dual-platform mobile apps with Xamarin.Forms for field operations, increasing team productivity by 25%. Built full-stack web applications using React for enterprise clients, enhancing system interoperability and user experience. Implemented cloud-native solutions with PostgreSQL and Entity Framework, improving operational efficiency by 15%.

Senior Software Engineer at ATH Infosystems

July 1, 2022 - Present

Engineered backend systems for transport management, enabling real-time driver tracking, automated invoicing, and centralized client data management. Developed cross-platform mobile and web applications for energy delivery self-service. Led backend development for a telemedicine platform with real-time appointments, e-prescribing, and payment processing, contributing to major client revenue growth. Automated deployment with Azure DevOps CI/CD pipelines and enhanced collaboration with product and QA teams, improving release reliability and reducing issues.

Senior Full Stack Developer at Castle Harlan

June 30, 2022 - July 21, 2025

Built tailored CRM systems to automate sales and contact management, integrating third-party services for business growth and compliance. Established a cloud banking platform on AWS featuring virtual cards and open banking APIs, targeting the Nigerian market. Developed responsive financial dashboards with Angular and WebSocket. Led a team of developers, improving code quality and performance with mentoring in React and TypeScript.

Lead .NET Developer at The Merriman

June 30, 2021 - July 21, 2025

Coached offshore teams developing healthcare coverage management solutions with automated eligibility and real-time alerts. Introduced microservices using Kubernetes, enabling highly available telehealth services. Developed HIPAA-compliant patient portals powered by Blazor with encrypted access for thousands of users. Refactored legacy healthcare software to modular WPF during the COVID-19 pandemic, reducing technical debt and enhancing user experience across platforms.

Full Stack .NET Developer at AtNetPlus

May 31, 2017 - July 21, 2025

Led cloud migration initiatives moving applications to Azure, reducing infrastructure cost. Created dual-platform mobile apps for field operations improving team productivity. Developed full-stack web applications using React to enhance interoperability and user experience. Implemented advanced data management with PostgreSQL and Entity Framework, increasing operational efficiency.

Senior Software Engineer at ATH Infosystems

July 1, 2022 - Present

Backend development for a transport management system using ASP.NET Core and Entity Framework Core, enabling real-time driver tracking via a companion mobile app, automated invoicing, and centralized management of customer, shipper, and consignee data for logistics companies. Designed cross-platform mobile/web apps for a regional energy provider (ASP.NET Core, Angular, Xamarin) to enable online booking and payment for CNG/PNG deliveries. Led the backend for a telemedicine platform (ASP.NET Core, SignalR, Twilio) delivering real-time video/voice/chat, e-prescribing, insurance claims, and payments, contributing to a 270% increase in client revenue. Integrated Azure DevOps CI/CD pipelines to automate deployment and testing, reducing release times by 60%. Collaborated with product managers and QA to ensure requirements traceability and reduce post-release issues.

Senior Full Stack Developer at Castle Harlan

June 30, 2022 - October 20, 2025

Built a tailored CRM system for a leading insurance firm using ASP.NET Core, SQL Server, and Asterisk for automated sales cycles, contact management, third-party bank and mobile app integrations, and complex call-center capabilities. Established a cloud banking system on AWS (EC2, Lambda, RDS) to support rapid wage access, virtual card issuance, and protected account management, integrating open banking APIs (Maplerads BaaS) for a fintech platform in the Nigerian market. Created a responsive financial trading dashboard with Angular and WebSocket for real-time data, and implemented high-performance data access with EF Core, Azure SQL, and Redis. Mentored a team of 6 developers in Agile practices to improve code quality and performance.

Lead .NET Developer at The Merriman

June 30, 2021 - October 20, 2025

Coached a 9-member offshore team in developing a healthcare coverage management application, delivering automated eligibility screening, real-time alerts, centralized data storage, and embedded reporting using .NET Core, Azure, and agile Scrum. Introduced a microservices strategy with .NET Core 2.2 and Kubernetes for a telehealth platform with web and Android apps, enabling robust video consultations, e-prescriptions, and in-app payments, achieving 99.99% uptime and reducing deployment complexity by 40%. Built a HIPAA-compliant patient portal with a sensitive healthcare dashboard processing 500+ daily medical interactions using React, and refactored legacy monolithic healthcare software into a modular WPF MVVM architecture.

Full Stack .NET Developer at AtNetPlus

May 1, 2017 - October 20, 2025

Orchestrated cloud migration strategies by transitioning diverse enterprise applications to Azure App Services, reducing infrastructure costs by 30%. Architected a dual-platform mobile application using Xamarin.Forms for real-time data synchronization across field operations, and built full-stack web applications using React to enhance interoperability and user experience. Implemented cloud-native data solutions using PostgreSQL, Entity Framework, and Redis to improve data management and performance across multiple client systems.