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# Application Support (.NET + SQL) - Hybrid Madrid (3-2)

- **Company:** UST
- **Location:** Madrid, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Microsoft Windows, Active Directory, Data Analysis, C Sharp (Programming Language), Databases, Relational Databases, Software Debugging, Distributed Systems, Linux System Administration, Log Analysis, Microsoft SQL Server, Release Management, Reliability Engineering, Software Engineering, SQL Databases, Freeform SQL, ReactJS, Grafana, Backend, Gitlab, Kubernetes, Apache Kafka, Front End Software Development, Restful APIs, Splunk, Dynatrace, Jenkins, Microservices
- **Published:** September 18, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=6c866282034323bf

## About the Role

* 3+ years of hands-on experience in L3 Application Support, Site Reliability, or Software Engineering in high-availability environments.
 * English C1
 * Strong backend troubleshooting skills with .NET and C# Solid experience with distributed architectures: REST APIs, Microservices, MQ and Kafka (event handling/topics debugging).
 * Deep working knowledge of MSSQL and relational databases for data analysis and troubleshooting.
 * Other databases technologies are a plus.
 * Proficient with Kubernetes, Windows, and Linux environments.
 * Proven ability to participate in an on-call rota (including evening/weekend coverage as scheduled).
 * Hands on experience using Dynatrace and Splunk. Grafana is a nice to have.
 * NICE TO HAVE Familiarity with frontend frameworks, specifically React, to assist in end-to-end user issue tracing. Prior experience in Fintech, Digital Banking, and investment product. Exposure to CI/CD pipelines (GitLab, Jenkins). Handling of Active Directory tasks., C#, .NET, Incident Management, Kubernetes

## Description

* Act as the L3 escalation point for critical production incidents, driving resolution through log analysis, code debugging, and telemetry.
 * Perform root cause analysis (RCA) for complex outages, working with core development teams to implement long-term fixes.
 * Coordinate and drive incident resolution efforts by quickly assessing issues, engaging the appropriate technical teams, and ensuring timely restoration of service.
 * Actively participate in live incident calls and maintain situational awareness until services are fully restored.
 * Monitor, troubleshoot, and optimize distributed microservices and event streams across production environments.
 * Maintain database integrity and debug performance issues using complex SQL queries.
 * Participate in release management, operational readiness reviews, and deployment processes in Kubernetes clusters.
 * Join the team's rotating 24/7 on-call duty schedule to support mission-critical applications.