Grow with us

About the Opportunity

Business Area Cloud Software & Services (BCSS) drives the convergence of cloud and services as customers deploy 5G. Our mission is to accelerate network optimization and automation through cloud-native software and services. Within BCSS, Core Networks Engineering ensures end-to-end product development with aligned architectures, tools, and processes.

Product Development Unit Communication Services, Unified Data Management & Exposure (PDU COS UDME) develops and maintains a competitive portfolio including IMS/VoLTE, UDM, MSS, Exposure & Service Enablement, Lawful Intercept, Network Location (ENL), Mission Critical Applications (MCA), and shared platforms (AXE, TSP, CBA).

Product Development Group MTAS&CSCF (PDG MTAS&CSCF) owns the design of two key products in our global VoLTE-based IMS platform: the Ericsson Multimedia Telephony Application Server (MTAS) and the Call Session Control Function (CSCF). Our teams are located in Sweden, Hungary, and India, collaborating closely with customer units during our transition into 5G.

Position Summary

We’re looking for a Senior Python Developer (MTAS) to join our Budapest-based team. You will develop MTAS/CSCF Workflow (VNF Lifecycle Management) features, primarily in Python, and support operational tasks in a fast-moving, customer-focused environment.

Our team values clear ownership, knowledge sharing, pragmatic decision-making, and continuous improvement. Because customers may require urgent fixes during upgrades, you will work closely with QA and Customer Success, participate in on-call rotation, and contribute to a culture that balances speed with quality.

What You Will Do

• Implement and test new Workflow features end-to-end for MTAS/CSCF.
• Triage and resolve TRs/CSRs, often during time-critical customer upgrades.
• Participate in on-call rotation and coordinate emergency fixes.
• Maintain technical documentation, runbooks, and post-incident reviews.
• Contribute to automation (CI, regression testing) to reduce release risk.

The skills you will bring

• 5–6+ years of experience
• Strong Python development skills
• Advanced Linux system knowledge
• Experience with Open Stack and VMware VIMs
• Good spoken and written English
• BSc or MSc degree

It is an advantage if you have:

• Telecom, networking, or SIP domain knowledge
• Experience with Jira or other ticketing tools
• Security awareness or experience
• System testing background
• CI/CD tools (e.g., Jenkins)

Why join Ericsson?

At Ericsson, you´ll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what´s possible. To build solutions never seen before to some of the world’s toughest problems. You´ll be challenged, but you won’t be alone. You´ll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.

What happens once you apply?

Click Here to find all you need to know about what our typical hiring process looks like.

Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer. learn more.

Primary country and city: Hungary (HU) || Budapest

Req ID: 777462