GSM network structure jobs

Service Desk Engineer (Fraud Prevention & Telecom Support)

Tieto · Posted Nov 5, 2026

Sofia, Sofia City Province, Bulgaria
Hybrid
Full-time · Mid
3+ years

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Provide L1 network support for voice and mobile services, monitor and investigate fraud events, and implement improvements in fraud prevention services for BICS customers.

Responsibilities

Provide L1 network support activities for voice and mobile services 24x7
Ensure re‑active repair activities with customers, suppliers and third parties worldwide
Monitor and investigate fraud events generated by internal tools to identify root cause and take resolution measures
Define and implement improvements in the Fraud prevention services delivered to BICS’ customers
Communicate with customers, suppliers to guarantee customer complaints resolution with SLA respect

Requirements

Bachelor’s or Master’s degree in Computer Science, IT, Telecom or equivalent

Skills

GSM network structure Signalling in GSM networks MTP ISUP/SIP SCCP TCAP protocol stack

Telco Engineer

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Benefits

Service Desk Engineer (Fraud Prevention & Telecom Support)

Responsibilities

Requirements

Skills