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Jean De Lange

@jeandelange

.NET full-stack software engineer at Warp Development, improving e-commerce platform performance by 60% and supporting 100,000+ active users.

South Africa

Message

At Warp Development, I lead development of high-traffic e-commerce storefronts and maintain .NET Core systems integrated with AWS. I designed a multi-tenant architecture supporting multiple online stores, and our multi-tenant, multi-pod system supported 100,000+ active users.

I improved core system performance by 60% by upgrading to .NET 8 and implementing async, and reworked caching to improve performance by 25%. I also optimized Redis caching and database queries, implemented payment and shipping integrations, and helped reduce server costs by 50% by moving certain features out of AWS.

Previously, at Creditec I developed a custom loan management system and improved query performance by 60% with stored procedures. At Mindmuzik Technologies, I built a large-scale sync that pulled in more than 3 million records in under two minutes; earlier, I developed mobile applications and .NET APIs at Euphoria Software.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Developer

Current

Warp Development

Nov 2021 - Present (4 years 11 months)

Lead development of multiple high-traffic e-commerce storefronts, designing scalable .NET Core backend systems integrated with AWS. Improved system performance by 60% and reduced server costs by 50%.

.NET Core AWS S3 Amazon SQS SNS EventBridge Redis Multi tenant architecture Ecommerce Payment Gateway Integration Team Leadership Code Review Clean Architecture

Senior Full Stack Developer

Creditec

Apr 2020 - Nov 2021 (1 year 7 months)

Designed and developed a custom loan management system for fintech operations, building high-performance stored procedures and integrating banking systems with biometrics. Improved query performance by 60%.

SQL Stored Procedures Web Forms XML XSL Fintech Banking Integration Biometrics Reporting Data Processing

Intermediate Full Stack Developer

Mindmuzik Technologies

Aug 2018 - Apr 2020 (1 year 8 months)

Developed and maintained internal web portals and desktop applications using .NET Core, MVC, and NHibernate. Built REST APIs and contributed to multiple client projects, improving delivery speed and reliability.

.NET Core MVC NHibernate REST APIs Agile Web Development Desktop Applications Data Processing

Junior Developer

Euphoria Software

Sep 2016 - Aug 2018 (1 year 11 months)

Developed cross-platform mobile applications using Apache Cordova and built backend web APIs with .NET Framework. Implemented real-time communication features using SignalR.

Apache Cordova HTML CSS JavaScript .NET Framework SignalR Mobile Development Web APIs

Workshop Manager / Junior Developer

Focus on Service

Jan 2013 - Sep 2016 (3 years 8 months)

Developed and maintained company website and in-house Windows Forms desktop software. Led workshop operations including payroll management and customer quotations, increasing customer visibility by 75%.

Windows Forms Web Development Desktop Applications Payroll Management Customer Service Productivity Improvement