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Senior Software Engineer
There's a reason why Fiserv
Sunnyvale, CaliforniaPosted Oct 8, 2026 · 3h ago$160K – $240K
$160K – $240KSenior levelFintech
About this role
Join Fiserv as a Senior Software Engineer to design, build, and maintain high-performance backend systems and RESTful APIs using C# and .NET 8. You will work with complex multi-tenant database architectures and cloud environments, driving seamless third-party integrations while ensuring application security and reliability.
What we are looking for
5- Build high-performance RESTful Web APIs using C# and ASP.NET Core
- Support and maintain legacy .NET Framework codebases
- Write, debug, and optimize complex raw SQL queries in MySQL
- Develop and consume RESTful endpoints, process JSON, and manage Webhook events
- Utilize Docker and cloud-hosted environments (AWS / GCP)
Skills mentioned
8JavaTypeScriptSQLReactAWSAzureGCPDocker