Core Systems Test Engineer- Staffing

Circet USA is the leading provider of Network Services in North America, and we're looking for talented professionals to join our team. We specialize in engineering and construction services delivering comprehensive solutions across Inside Plant, Outside Plant, and Wireless networks to meet the evolving infrastructure needs of our customers.

With nearly 50 years of industry experience, we work with major telecom service providers, MSOs, cloud service providers, and utilities. At Circet USA, you'll have the opportunity to make an impact by helping to create customized solutions that address our clients' unique challenges. If you're passionate about innovation and thrive in a dynamic environment, we'd love to hear from you.

Circet USA's benefits package includes the following:

Medical, Dental, and Vision insurance
• Digital Health & Wellness Support
• Critical Illness, Accident, & Hospital Insurance
• Short-term & Long-term disability
• Group term & Voluntary life insurance
• Flexible Spending and Health Savings Accounts
• Paid Time Off & 401K
• Company Discount Website

A highly skilled Core Systems Test Engineer with a strong background in designing, executing, and automating tests for core network infrastructure and services. Experienced in validating, troubleshooting, and optimizing core systems such as IMS, EPC (Evolved Packet Core), and 5G Core. Proficient in ensuring the seamless integration and performance of core network components, ensuring they meet functional, performance, and security standards. Known for driving improvements in testing strategies and methodologies, ensuring high-quality deliverables while maintaining a focus on system reliability and performance.

ESSENTIAL DUTIES & RESPONSIBILITIES include the following. Other duties may be assigned:

The role involves performing system integration and interoperability tests, supporting customer acceptance tests, and providing field deployment support for NFV-based 5G SA/NSA core systems. The Core team is particularly interested in candidates with extensive expertise in Mobile Networks Subscriber and Policy Operations, including experience with subscriber database migration.
Job responsibilities and duties include system-level feature integration and verification, inter-operability tests with external elements, developing and performing test plans, troubleshooting and analyzing problems in customer's lab and production systems, new system deployment and commissioning new system, and migration of network systems.

• BS/BE in Computer Science or Computer Engineering major and minimum 5 years of telecommunication industry experience or MS in Computer Science or Computer Engineering major with 3 years of telecommunication experience.
• Hands-on experience in technical support, troubleshooting, and operational support of 3G/4G mobile subscriber and policy management systems (HLR/HSS).
• Hands-on experience in configuration, troubleshooting and analysis of end-to-end flow and processes between user SIM, subscriber management UI/portal, and HLR/HSS
• Proficiency in LTE and 5GC call flow diagnostics.
• Expertise in using Wireshark or other IP protocol analyzers.
• In-depth understanding of EPC and SA/NSA 5GC architecture.
• Experience in debugging LTE and 5G SA/NSA call flows.
• Hands-on experience in operational management of mobile network subscriber and policy management systems.
• Familiarity with the service-based architecture and 5G SA cloud-native core network functions.
• Proficiency in LTE and 5GC call flow diagnostics.
• Knowledge of LTE core interfaces such as S1, S6a, S11, DNS, Gx, Gy, S2a, S5/S8, S6b, SGi, S1-U, NAS, GTP-U, GTP, DIAMETER, RADIUS, etc.
• Understanding of SIP, IMS, and IP telephony standards.
• Experience with VoLTE and Deep Packet Inspection.
• Strong knowledge of IP protocols, including IPv6, TCP/IP, UDP, ECMP, OSPF, BGP, VLAN, IPSec, NAT, IP forwarding.
• Network administration skills are advantageous.
• Familiarity with Tomcat and web GUI is beneficial.
• Exposure to programming in Python, Java, Perl, and Unix/Linux shell scripting is advantageous.
• Expertise in using Wireshark or other IP protocol analyzers.
• Experience in Cisco router configuration is a plus.
• Understanding of technologies like OpenStack, OpenShift, DevOps, NFV, CNF, and Kubernetes is beneficial.

Circet USA is an Equal Opportunity Employer - Veteran/Disabled. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected veteran status or other characteristics protected by law.