Senior Core Network Solution Architect at Airalo

Ready to make travel easier for millions? Airalo is the world’s first and largest eSIM store, helping travellers stay connected seamlessly in over 200 countries and regions. We trust our teams to take ownership, put customers first, and do work that has a real impact every day. What’s in it for you? Airalo offers team members a range of perks, including remote work, generous PTO, wellness and learning allowances, and, of course, our annual Airalo Away retreat. Learn more about our benefits here; www.notion.so/airalo-public/Benefits-25396a97ffca81fb9bc1f0be479f1be3   Hi, I’m Peter, VP of Networks at Airalo! Our team ensures customers have instant, smooth connectivity from the moment they purchase their plan to the moment they arrive at their destination. We go beyond standard mobile service, building innovative solutions that enhance the traveller experience. We’re looking for curious engineers who want to design the future of global networks. Think outside the box, reverse-engineer solutions from ambitious product ideas, and help pave the way for Airalo’s leadership as a global connectivity partner. Airalo’s fully remote Networks team is growing. You’ll work on the systems and infrastructure that keep over 20 million travellers connected reliably and securely at global scale. Solve complex technical challenges, optimize processes, and experiment with better ways to keep the world connected. Your main responsibilities will be: • Own the HLD and LLD for Core Network services, ensuring seamless integration between the Packet Core (EPC/5GC) and IMS domains. • Lead the technical rollout of VoLTE Roaming (S8HR) and SMSoIP strategies, ensuring high-quality voice and messaging services across diverse roaming partners. • Design and optimise data session flows, including Local Breakout and Home Routed architectures to minimise latency for global users. • Lead technical discussions with IPX/GRX providers and Equipment Vendors to secure the best architectural paths for our traffic. • Act as the Subject Matter Expert for the transition from 4G to 5G Standalone (SA), focusing on the deployment of the Service-Based Architecture (SBA). What you’ll need: • Extensive experience in Core Network architecture within a Tier 1 Carrier, MVNO, or major vendor environment. • Deep understanding of the IMS (IP Multimedia Subsystem) architecture and how it interacts with the EPC/5GC for VoLTE and SMS services. • Expert-level knowledge of SIP, Diameter, and GTP signalling. You should be comfortable architecting the signalling paths that facilitate global roaming. • Strong grasp of IPX/GRX connectivity and the BGP/DNS logic (S-NAPTR) required for global network discovery. • Ability to lead "Acceptance Testing" (ATP) and technical workshops with external stakeholders to ensure designs are implemented to spec. Bonus Points: • Experience with Cloud Native Network Functions (CNF) and deploying core elements in AWS/GCP/Azure environments. • Knowledge of 5G Slicing and how it applies to specialised data services. • Previous experience in an MVNE/MVNO environment during a high-growth phase. By applying, you acknowledge and agree that, in case of successful application, Airalo may request to run background checks as a condition for entering into an agreement with you. Rest assured that these checks will only occur upon your prior consent and at the end of the selection process, and will be strictly limited to what is allowed under the laws that are applicable to you. All data that you share or that we collect in connection with such checks will be processed in accordance with our Privacy Policy, available here: www.airalo.com/more-info/privacy-policy?srsltid=AfmBOooBT0rXAj1FaNelZ3VfN0wvhwzvAoxdtHnOKSVETpiSjiXVuycy    We sincerely thank all applicants in advance for submitting their interest in this opportunity. Airalo is an equal-opportunity employer and values diversity, equity & inclusion. We do not discriminate on the basis of race, religion, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We are committed to providing reasonable accommodations upon request for individuals with disabilities throughout our job interview process.