What you will do: Own end-to-end 5G Core system architecture across the full service chain — AMF, SMF, UPF, UDM, PCF, AUSF, CHF, NEF — and produce architecture decision records (ADRs), system decomposition documents, and interface specifications that serve as the engineering source of truth. • An opportunity to really make a difference • Sustainability at our core • Fair and honest workplace • Innovative thinking is encouraged • Competitive salaries • Continuous learning and development • Health and wellness care options • Financial solutions for the future • Optional legal services (US only) • Paid holidays • Paid time off .