Enterprise Backend & API Development (Java/Spring Boot/.NET/C#)Jack Kollar
Design and build secure, scalable backend systems and high-performance APIs using Java (Spring Boot) or .NET (C#). Ideal for enterprise platforms, SaaS products, and mission-critical applications requiring reliability, clean architecture, and long-term maintainability. I deliver production-ready services with robust authentication, database integration, microservices support, and cloud-ready deployment — engineered to handle real business workloads at scale.
Example work
Starting at$75 /hr
Tags
C#
Java
.NET
Spring Boot
Backend Engineer
Dot Net Backend Developer
Fullstack Engineer
Software Developer
Software Engineer
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Jack Kollar
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Newnan, USAEnterprise Backend & API Development (Java/Spring Boot/.NET/C#)Jack Kollar
Starting at$75 /hr
Tags
C#
Java
.NET
Spring Boot
Backend Engineer
Dot Net Backend Developer
Fullstack Engineer
Software Developer
Software Engineer
Design and build secure, scalable backend systems and high-performance APIs using Java (Spring Boot) or .NET (C#). Ideal for enterprise platforms, SaaS products, and mission-critical applications requiring reliability, clean architecture, and long-term maintainability. I deliver production-ready services with robust authentication, database integration, microservices support, and cloud-ready deployment — engineered to handle real business workloads at scale.
Example work
$75 /hr