Senior Application Support Engineer – L3 / .NET / SQL

We are looking for a Senior Application Support Engineer with strong experience providing L3 and BAU support for production web applications.

This is an application support-focused position rather than a traditional software development role. The ideal candidate is highly skilled in troubleshooting complex production issues, working with SQL Server, analyzing application behavior, performing root cause analysis, and debugging .NET/C# applications when required.

You will collaborate with US-based development, infrastructure, and business teams, so advanced English and availability to overlap with US working hours are required.

What You'll Do

• Provide L3 and BAU production support for web-based applications.
  
• Own complex incidents and application issues through resolution.
  
• Troubleshoot application errors, bugs, performance issues, and production incidents.
  
• Perform root cause analysis (RCA) and implement preventive solutions for recurring issues.
  
• Work extensively with Microsoft SQL Server to investigate and resolve application and data-related problems.
  
• Analyze and troubleshoot stored procedures, functions, triggers, views, and queries.
  
• Debug existing applications built with C#, ASP.NET, .NET Framework and .NET Core.
  
• Implement or collaborate on bug fixes when necessary.
  
• Support and troubleshoot SSRS reports and SQL-based reporting processes.
  
• Monitor application performance and identify optimization opportunities.
  
• Collaborate with development and infrastructure teams on complex technical incidents.
  
• Participate in application updates, patches, testing, and deployments.
  
• Document troubleshooting procedures, solutions, SOPs, and application support processes.
  
• Communicate incident status and resolutions effectively to technical and business stakeholders.
  

Requisitos

• 4–8 years of professional IT experience.
  
• Strong hands-on experience in L3 Application Support / Production Support / BAU Support.
  
• Proven experience supporting web-based applications in production environments.
  
• Advanced knowledge of Microsoft SQL Server and SQL querying.
  
• Hands-on experience troubleshooting and optimizing:
  • Stored Procedures
    
  • Functions
    
  • Triggers
    
  • Views
    
  • Complex SQL queries
    
• Strong experience with SSRS (SQL Server Reporting Services).
  
• Experience troubleshooting/debugging applications using:
  • C#
    
  • ASP.NET
    
  • .NET Framework 4.0+
    
  • .NET / .NET Core
    
  • JavaScript
    
  • jQuery
    
• Ability to analyze existing application code and perform or support debugging and bug fixes.
  
• Experience with source control tools such as Git/GitHub.
  
• Strong troubleshooting, analytical, and root cause analysis skills.
  
• Bachelor's degree in Computer Science, Information Technology, Software Engineering, or a related field.
  
• Advanced English (B2+/C1) – ability to communicate effectively with US-based technical and business teams.
  
• Availability to overlap with US working hours.
  

Nice to Have

• Experience with Power BI.
  
• Experience with Sigma Computing.
  
• Experience supporting applications hosted in Microsoft Azure.
  
• Knowledge of ITIL frameworks and application support best practices.
  
• Experience with application monitoring and performance optimization.