Architect - Voice/ Mobile Roaming & IoT

Work Experience: 15+ Years Department: Information Systems IoT, Voice & Roaming Architecture. About the Role: We are seeking a highly experienced and visionary Architect to join the Voice, Mobile Roaming, and IoT Architecture group within iBASIS. In this strategic role, you will lead the end-to-end architecture, design, and evolution of our global Voice, Roaming, and IoT platforms. You will define technical roadmaps, drive cross-domain solution architecture, and ensure the scalability, reliability, and security of all signaling, roaming, and IoT services. This role is central to iBASISs mission to remain a global leader in IPX, mobile roaming, and next-generation IoT connectivity. You'll Bring: Bachelors or masters degree in electrical engineering, Telecommunications, or Computer Science with 15+ years of experience in the telecommunications domain. Deep expertise in Voice (TDM & VoIP), Mobile Roaming, and IoT architectures , including end-to-end service design. Extensive hands-on and architectural experience with 3G, 4G, and 5G signalling : MAP, Diameter, SIP/IMS, HTTP/2, GTP-C/U, SBA interfaces, and interworking models. Strong understanding of roaming technologies , including SS7, Diameter Roaming, LTE/VoLTE Roaming, 5G interface, IPX models, and fraud/security frameworks. Proven experience designing and integrating mobile core systems such as HLR/HSS, STP/DRA, SMSC, MME/AMF, SGW/UPF, PGW/SMF, IMS Core, SBCs, and GTP proxies. Expertise in IoT connectivity architectures , eSIM/eUICC, CMP platforms, SIM provisioning flows, and GSMA M2M/IoT standards. Ability to lead cross-functional engineering teams, influence stakeholders, and drive architectural governance. Strong analytical mindset with the ability to be highest level of knowledge for troubleshooting complex signaling and roaming issues across multi-vendor environments. Good to Have: Experience working with telecom operators, carriers, or global IPX providers . Active participation or collaboration with GSMA, 3GPP, IETF , or similar standards bodies. Strong documentation and architectural modeling skills (UML, sequence flows, high-level and low-level design). Experience with eSIM/Remote SIM Provisioning , SIM Toolkit, and GSMA SGP.02/22/32 specifications. Familiarity with REST APIs, microservices , and cloud-native architectural patterns. Likely to Have Strong background in IP networking , routing protocols (BGP, OSPF), MPLS, VPNs, and interconnect architectures. Hands-on experience with scripting or automation (Python preferred) for testing, validation, and network automation. Working knowledge of network and signaling test tools such as Spectra, Wireshark, Comprion, Keysight, Spirent , or similar. Experience designing or operating large-scale distributed systems with high availability and low latency requirements.