oxio - HLR / HSS / UDM Architect

• EDUCATION & BACKGROUND • BSc degree in Telecommunications, Computer Science, or equivalent; post-graduate studies are a plus. • 10+ years of core telecommunications network experience, with a minimum of 5 years hands-on with HLR, HSS, UDR, or UDM platforms. • Deep operational knowledge of HLR platforms (e.g., Ericsson HLR, Nokia FlexiISN, Huawei HLR9820) and their MAP/TCAP/SCCP signaling stacks. • Hands-on experience with HSS platforms and Diameter-based interfaces: S6a, S6d, Cx, Sh, Zh — including Diameter routing agent (DRA) configuration and troubleshooting. • Experience with IMSI/MSISDN range management, number portability (NP/MNP) integration, and SIM/eSIM provisioning workflows. • TECHNICAL — PROTOCOLS & STANDARDS • Diameter protocol expertise: peer configuration, routing, AVP manipulation, error handling, and Diameter watchdog/transport management. • TECHNICAL — NETWORK & SYSTEMS • Comfortable with Linux/Unix-based systems — able to navigate shells, interpret logs, manage processes, and perform basic system administration on telecom NF hosts. • Strong written and verbal communication skills in English — able to produce clear incident reports, change request documentation, and runbooks. • Able to work under pressure during high-severity incidents while maintaining methodical troubleshooting discipline. • Effective at interacting with external vendors, MVNO partners, and cross-functional internal teams. • Adaptable and comfortable driving change in a fast-moving MVNO environment. • Ready to work on morning/afternoon shifts and participate in on-call rotation. • 2+ years of scripting experience (Python, Bash) for automation of provisioning, audit, and reconciliation tasks on HLR/HSS/UDM/UDR systems. • Experience with AUSF, UDSF, or PCF in 5G SA environments. • Familiarity with cloud-native telecom platforms (OpenShift, Kubernetes) and Helm-based NF lifecycle management. • OXIO is committed to fostering a diverse, equitable, and inclusive workplace where all employees feel valued and empowered. We believe that diversity in all its forms drives innovation and creativity, and we strive to create an environment that reflects and celebrates the unique backgrounds, perspectives, and talents of our employees. We do not discriminate against any employee or applicant for employment based on race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), national origin, age, disability, genetic information, veteran status, or any other characteristic protected by applicable federal, state, or local law. We are dedicated to providing a work environment free from discrimination and harassment. We committed to ensuring that all qualified applicants have an equal opportunity to apply for job openings. If you need assistance or an accommodation due to a disability, please contact us at [email protected] for more information.