QAT Global, a 25+ years IT consulting firm based in the US, is seeking a highly-skilled Sr. Software Engineer (React & .Net) with the ability to communicate well in English. This position will work directly with the customer located in the US and with development teams in our US, Costa Rica, and Brazil locations.This opportunity can be 100% remoteOnly hiring QAT Employees (CLT only in Brazil)Required ExperienceStrong React experience (must-have)Strong C# .NET Core experience (must-have)Strong experience with GraphQL (must-have)Proven ability to refactor code and resolve concurrency issuesStructural design patterns and experience building high-performance systemsHands-on knowledge of TypeScript, Jest, Cypress, and xUnitProficiency with MongoDBA Bachelor’s degree in Computer Science or a related field or equivalent experienceExcellent communication skills in English – both written and verbalComfortable working 9 AM to 6 PM EST, Monday through Friday.Preferred ExperienceExperience with Agile/Scrum workflowsFamiliarity with CI/CD pipelinesCloud experience (AWS, Azure,etc.)