The typical Fiserv .NET Developer salary is $83,850. .NET Developer salaries at Fiserv can range from $78,622 - $98,718. This estimate is based upon 6 Fiserv .NET Developer salary report(s) provided by employees or estimated based upon statistical methods. When factoring in bonuses and additional compensation, a .NET Developer at Fiserv can expect to make an average total pay of $83,850 . See all .NET Developer salaries to learn how this stacks up in the market.