[TSO] Application Support Engineer L3 (Telco)

SoftwareMind

Warsaw, Masovian Voivodeship, Poland Remote permanent

Posted: February 17, 2026

Job Description

Software Mind develops solutions that make an impact for companies around the globe. Tech giants & unicorns, transformative projects, emerging technologies and limitless opportunities – these are a few words that describe an average day for us. Building cross-functional engineering teams that take ownership and crave more means we’re always on the lookout for talented people who bring passion and creativity to every project. Our culture embraces openness, acts with respect, shows grit & guts and combines employment with enjoyment.

Project – the aim you’ll have

Our clients are the largest mobile network operators in Poland and in Europe. We deliver solutions and services that transform their networks and provide innovative services to millions of subscribers. We are looking for highly - skilled engineers to join our team and help us implement, deliver and maintain smooth operation of applications for our clients.

Position – how you’ll contribute

• Analysis and resolution of incidents escalated from L2 Support (3rd line support)
• Diagnosing application issues using logs, monitoring tools, and debugging techniques
• Reproducing defects and identifying root causes (application, database, integrations, configuration, user behavior)
• Implementing changes in subordinate systems

Expectations – the experience you need

• Minimum 2 years of experience in an Application Support / L2 Support role or similar, in high-availability production environments
• Hands-on experience with Kubernetes: deploying applications, updates and troubleshooting
• Experience in Linux environment administration (Rocky / RedHat / Debian)
• Good knowledge of a TCP / IP protocol stack
• Knowledge of Gitlab CI/CD
• Knowledge of at least one scripting language (e.g. bash, perl, python)
• Knowledge of SQL and experience in SQL database administration (MySQL, PostreSql)
• English and Polish language at a level that allows for easy communication and creating documentation
• Availability to work in shift mode / on-call / 24x7

Additional skills – the edge you have

• Experience with configuration management and automation tools (Ansible or Terraform)
• Knowledge of VoIP protocols and LTE / 5G / IMS network architectures

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