L3 Application Support

Work Model: Hybrid (2–3 days/week from Warsaw office)

Contract Type: B2B

Start Date: Immediate

Work Location: Warsaw, Poland

Working Hours/Shifts: Standard business hours (on-call rotation required)

Language Requirement: English (professional working proficiency)

Experience Required: 4 to 7 years

Job Description

Roles & Responsibilities:

• Provide L3 24/7 support for production systems with participation in on-call rotation.
• Troubleshoot and debug production issues; perform root cause analysis.
• Use monitoring and alerting tools such as Splunk, Prometheus, and Grafana.
• Support Kafka, Cassandra, and VM environments.
• Develop and maintain scripts using Python and/or Bash.
• Collaborate within an Agile environment across analysis, design, coding, and unit testing phases.
• Guide software development teams to improve system resiliency, performance, efficiency, and cost.
• Design and implement dashboards, metrics, and alerts for critical applications.
• Operate across multiple platforms including Unix/Linux/Ubuntu/Windows.
• Work with database technologies like Oracle and MySQL.
• Support enterprise-level Java applications using technologies such as:
• Java, J2EE, Spring, Hibernate, JDBC, IBM MQ, SOAP/REST services.
• Manage incident resolution, bug fixing, and production support in cross-functional teams.
• Exposure to Mobile SDKs is considered a plus.

Mandatory Skills:

• L3 Production Support
• Troubleshooting & Debugging in distributed systems
• Splunk, Prometheus, Grafana
• Kafka, Cassandra
• Python and/or Bash scripting
• Java (Spring, Hibernate, Web Services)
• Oracle/MySQL
• Linux/Unix environments

Desired Skills:

• Understanding of mobile SDKs
• Experience in Agile development environments
• Knowledge of system architecture optimization