L3 Application Support — .NET & SQL (Hybrid Madrid)

Ust; Madrid; Presencial; EUR 45.000 - 65.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

23 days annual leave + 24/31 December

Health and life insurances

Flexible remuneration program

Training platforms access

Career stability and growth

Referral bonuses

12 or 14 payments/year

Work-life balance: WFH/remote policy

UST Club discounts

Descripción de la vacante

UST is seeking an experienced L3 Application Support Engineer to join a strategic banking project in Madrid, working on .NET, SQL, and distributed architectures. You will act as the escalation point for critical incidents, perform RCA, and coordinate resolution across teams, including on-call rotations.

Required 3+ years in high-availability environments, strong backend skills in .NET/C#, and experience with REST APIs, Microservices, MQ, Kafka, and MSSQL.

Formación

• 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.
• Deep working knowledge of MSSQL and relational databases for data analysis and troubleshooting.
• Proficient with Kubernetes, Windows, and Linux environments.
• Experience in on-call rotations (evenings/weekends) and in using monitoring/telemetry tools (Dynatrace, Splunk).
• Nice to have familiarity with frontend frameworks (React) and exposure to CI/CD pipelines (GitLab, Jenkins).

Responsabilidades

• 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 teams rotating 24/7 on-call duty schedule to support mission-critical applications.

Conocimientos

English C1

L3 Support Experience

.NET

C#

SQL

REST APIs

Microservices

MQ

Kafka

Kubernetes

Dynatrace

Splunk

React (nice to have)

CI/CD (GitLab, Jenkins)

Active Directory

Herramientas

.NET

SQL Server

REST APIs

Microservices

MQ

Kafka

Kubernetes

Dynatrace

Splunk

Grafana

React

GitLab

Jenkins

Active Directory

Descripción del empleo

UST is seeking an experienced L3 Application Support Engineer to join a strategic banking project in Madrid, working on .NET, SQL, and distributed architectures. You will act as the escalation point for critical incidents, perform RCA, and coordinate resolution across teams, including on-call rotations.

Required 3+ years in high-availability environments, strong backend skills in .NET/C#, and experience with REST APIs, Microservices, MQ, Kafka, and MSSQL.