Sr Specialist System Engineering (IMS Voice Core)

AT&T; India; On-site; INR 2,500,000 - 4,200,000; Full time

Job summary

AT&T in India (Bangalore) seeks a senior network engineering specialist to architect and certify containerized mobility core functions on Red Hat OpenShift. You will work with Nokia NIAM/NAC, CNCS, CSCF, and SBC components, ensuring secure, scalable deployments and effective cross-team collaboration.

You will apply IaC practices, scripting, and cloud platform experience to optimize performance, encryption, and access control while supporting offshore collaboration with US stakeholders.

Qualifications

• Strong knowledge of Nokia NIAM and NAC in IMS/CME environments.
• Experience with CNCS, NTAS, CSCF components and SBC.
• Proficient in debugging call flows and telecom signaling.
• Experience with virtualization, containerization and IaC concepts.
• Proficient in OpenShift, cloud platforms and scripting (Python/Ansible).
• Security focus: data encryption, RBAC and audits.
• Experience with CI/CD and Linux administration.

Responsibilities

• Architect, design, integrate and certify containerized network functions on OCP.
• Collaborate with SMEs and cross-functional teams to deliver features.
• Work on Nokia NG USP components (NAC, NIAM, CNCS, CSCF, S/S, ECSCF).
• Perform testing, triage, and performance tuning for high availability.

Skills

Nokia NIAM

Nokia NAC

IMS SIP

CNCS NTAS

CSCF

SBC

Infrastructure as Code

OpenShift

Python

Ansible

Shell scripting

Java

JavaScript

Linux

Git

CI/CD

Azure

Education

Bachelor's Degree in STEM

Tools

Red Hat OpenShift

Nokia Cloudband

Nokia Container Services (NCS)

Microsoft Azure

YAML/JSON

Job description

Job Responsibilities

Mobility Core and Network Engineering team is part of the Network CTO organization that oversees the global mobile and fixed network technology direction for AT&T, which includes the design of the company’s 5G and IMS infrastructure.

This team is responsible for the architecture, design, certification, testing and delivery of advanced Mobility Core network functions and Network Services applications, including for IP multimedia systems and packet data, which are the future of Mobility services and experiences. The team contributes to the growth and development of end-to-end wireless network services across Consumer, Enterprise, Internet of Things (IOT), FirstNet and public sector products.

In this role, you will work on architecture, design, integration and platform certification on containerized network functions on RedHat OCP infrastructure. The role will be responsible for one or more Nokia applications such as Automation and Control (NAC), Identity and Access Manager (NIAM), Cloud Native Communication Suite (CNCS), Call Session Control Function (CSCF), Stir-Shaken (S/S), and Emergency CSCF (ECSCF) within the ngUSP solution. You will work closely with subject matter experts from our team as well as supporting teams.

Job Qualifications / Required Qualifications

• Deep understanding of Nokia Identity and Access Management (NIAM) and Nokia Automation and Control (NAC)
• Deep understanding of the IP Multimedia Sub-systems (IMS), SIP, Diameter flows.
• Deep understanding of Nokia Cloud Native Communication Suite (CNCS), Nokia Telcom Application Server (NTAS), Call Session Control Function (CSCF) components, Nokia Session Border Controller (SBC).
• Deep understanding of call flow troubleshooting and triage
• Deep understanding of virtualization, containerization, and Infrastructure as Code (IaC) concepts
• Skilled in various cloud platforms, e.g., Nokia Cloudband, Redhat OpenShift (OCP), Nokia Container Services (NCS), Microsoft Azure
• Skilled in programming skills in a language like Python, ansible, shell scripting, JavaScript, or Java
• Experienced in data encryption, security audit, Role based access control.
• Good knowledge of networking concepts
• Experience in test planning and execution
• Experience with performance engineering, profiling and tuning to meet High-Availability needs.
• Understanding of Data Analytics, data visualization.
• Good experience in Alarm treatment, analysis, and ticket generation.
• Experience with Continuous Integration/Continuous Deployment (CI/CD), Software Development & Delivery.
• Administrator level expertise in Linux.
• Experienced in YAML and JSON file types and their usage.
• Basic familiarity of GIT.

Preferred Qualifications

• Bachelor's Degree in a STEM discipline e.g. Computer Science, or Engineering.
• Basic understanding of telecommunications, network architecture, and wireless communication protocols
• Exposure to network analysis and telecom-specific data sources.
• Familiarity network and application security concepts and methods
• Artificial Intelligence/Machine Learning (not mandatory but a plus):
• Awareness of machine learning frameworks and concepts.
• Basic understanding of mathematics relevant to AI/ML.
• Familiarity with data preprocessing and model evaluation techniques.
• Interest in learning new tools and technologies.
• Excellent communication skills (written and oral) and intercultural communication abilities.
• Must have a win as one attitude, to work as a team to carry out projects on time with quality

Additional Job Information

This is an offshore role that requires daily collaboration with U.S. stakeholders, including overlapping work hours to ensure effective partnership and meet business needs.

Weekly Hours: 40

Time Type: Regular

Location: IND:KA:Bangalore / Epip Area, Hoodi Village, Whitefield Rd - Eqp: Plot 111/112, Epip Area, Hoodi Village, Whitefield Road

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