Senior full stack .Net Developer

Fiserv•Berkeley Heights, NJ

About The Position

A successful Senior full stack .Net Developer at Fiserv designs builds and maintains high-quality applications that support business goals and client needs. You partner with cross-functional teams to translate requirements into scalable, reliable solutions across the stack. You raise engineering standards through mentoring, strong delivery practices, and responsible use of AI-assisted development tools.

Requirements

10+ years of software development experience delivering production applications.
6+ years of programming experience with C#/.NET
3+ years of experience with SQL databases
3+ years with AWS, Azure, or GCP services.
3+ years of experience with CI/CD + DevOps
3+ years working in Agile.

Nice To Haves

2+ years of experience in financial services or payments technology.
1+ year using AI-assisted development tools (for example, GitHub Copilot or ChatGPT Code Interpreter) to generate functions/classes, tests, and documentation.
1+ year applying AI tools to improve code quality (for example, refactoring UI code, suggesting performance improvements, and establishing cleaner patterns across large .NET projects).

Responsibilities

Lead the design, development, and implementation of software applications to support Fiserv business goals.
Collaborate with cross-functional teams to gather requirements and translate them into technical specifications.
Perform coding, testing, and debugging to ensure optimal performance and reliability.
Maintain and improve existing codebases and lead peer review processes to strengthen quality and consistency.
Mentor junior developers and provide technical guidance, including leveraging AI tools (GitHub Copilot in Visual Studio or ChatGPT Code Interpreter) to accelerate .NET UI development, generate documentation/unit tests (for example, XML comments), and refactor for maintainability and performance.