Roaming Operations Engineer L2

ROAMING OPERATIONS ENGINEER L2 - MID-LEVEL (HYBRID LISBON)
Portuguese company hires for hybrid position
Location: Lisbon, Portugal
⚠️ Only candidates already based in Portugal will be considered
Work Model: Hybrid – 2 days per week on-site (Business Hours, with availability for out-of-hours support when required)
️ Language Requirements: Spanish – B2 or higher (Mandatory), English – B2 or higher (Mandatory), Portuguese – Nice to have
Seniority: Mid-Level - 3+ years
Sector: Telecommunications
Rate Between €*** RV (gross value)
⚠️ Instructions: Please send your CV in English and make sure to include all skills and experience that match the requirements of the opportunity.
This will significantly increase your chances of success
About the Opportunity
Are you passionate about mobile core networks, international roaming, and solving complex telecommunications challenges?
We are looking for a Roaming Operations Engineer L2 to become the technical escalation point for international roaming operations, ensuring service stability and high availability across global mobile networks.
In this role, you will work closely with international operators, vendors, engineering teams, and internal stakeholders to resolve critical incidents, improve operational processes, and support the evolution of next-generation roaming services, including LTE, VoLTE, VoWiFi, and 5G Roaming.
This is an excellent opportunity for professionals who thrive in mission-critical telecom environments and enjoy combining deep technical expertise with operational leadership.
Working Hours & Shift Schedule
Please note that this position will temporarily require shift work.
Although there is currently no definitive date for the transition, this shift-based model is expected to remain in place for approximately 9 to 12 months.
During this period, the working schedule will be:
Morning Shift: 06:*:00
Afternoon Shift: 14:*:00
Night Shift: 22:***:00
After this temporary period, the position is expected to transition to regular daytime working hours, from 08:00 to 17:00 (Spain time), complemented by an on-call rotation.
Key Responsibilities
Analyze and resolve complex incidents escalated from the L1 support team.
Perform advanced troubleshooting across Mobile Core and International Roaming platforms.
Conduct detailed Root Cause Analysis (RCA) and implement corrective and preventive actions.
Coordinate incident resolution with international operators, equipment vendors, and technology partners.
Lead technical activities during major incidents and high-impact service disruptions.
Support change implementations, maintenance windows, and operational validations.
Produce technical documentation, operational procedures, and post-incident reports.
Mentor and support the technical development of L1 teams.
Identify automation opportunities and operational improvements.
Participate in network evolution and operational transformation initiatives.
Required Qualifications
Bachelor's degree in Telecommunications, Computer Science, Networking, or a related field is preferred.
Candidates without a higher education degree may also be considered, provided they have relevant professional experience in the required area.
Minimum 3years of experiencein Mobile Core, Roaming Operations, Network Support, or Telecommunications Engineering.
Strong experience troubleshooting complex telecommunications environments.
Professional communication skills inSpanishandEnglish(minimum B2).
Excellent analytical thinking and problem-solving abilities.
Required Technical Skills
Mobile Core & Roaming
LTE Roaming
VoLTE Roaming
VoWiFi Roaming
5G Roaming
IMS
IPX
International roaming interoperability
Signaling Protocols
SS7
SIGTRAN
Diameter
SIP
Subscriber & Authentication Platforms
HLR
HSS
UDM
UDR
EIR
DNS
AAA
LDAP
Interconnection Platforms
STP
DRA / DRS
SBC
Roaming Hub
SS7 Firewall
Diameter Firewall
SeGW (Security Gateway)
Operations & Service Assurance
Critical Incident Management
Root Cause Analysis (RCA)
Problem Management
Change Management
KPI Monitoring
SLA Management
ITSM Platforms
Observability Tools
Nice to Have
Portuguese language skills.
Experience with telecom automation initiatives.
Exposure to large international carrier environments.
Knowledge of operational transformation projects.
Continuous improvement methodologies.
What We're Looking For
Strong technical leadership and ownership mindset.
Excellent analytical and troubleshooting skills.
Ability to remain calm and make decisions during critical incidents.
Strong communication and stakeholder management skills.
Customer-focused approach with a