Fraud Specialist

Romania (Hybrid)

Revenue Assurance Manager / Finance team based in Paris.

Onoff is a fast-growing telecommunications company providing innovative mobile communication services across multiple countries. We combine telecom expertise with technology to offer secure, reliable and compliant communication solutions to both consumers and businesses.

As our customer base continues to grow, we are strengthening our Fraud & Revenue Assurance team to better detect, investigate and prevent telecom and payment fraud.

We are looking for a Fraud Analyst with 2 to 6 years of experience in telecom fraud, payment fraud or revenue assurance.

Reporting to the Revenue Assurance Manager, you will be responsible for monitoring suspicious activity, investigating fraud cases and applying our fraud prevention procedures on a daily basis.

This is a hands-on operational role. You will work closely with Customer Support, Product, Finance and Engineering to help protect Onoff against telecom and payment fraud.

We're looking for someone who enjoys investigations, has strong analytical skills and is comfortable working in a fast-moving environment where processes continue to evolve.

• Monitor customer activity to identify suspicious behaviour.

• Review SMS, voice and usage patterns to detect fraud.

• Investigate suspicious accounts and determine the appropriate action.

• Block, suspend or restrict fraudulent accounts according to internal procedures.

• Escalate complex fraud cases when required.

• Keep up to date with the latest frauds and tools

• Handle fraud-related disputes and investigations.

• Perform manual reviews of newly created accounts and high-risk customers.

• Review payment activity and identify suspicious payment behaviour.

• Monitor fraud dashboards and alerts on a daily basis.

• Participate in post-KYB fraud reviews when required.

• Investigate suspicious telecom traffic with third party tools (fraudguard) and internal reports (CDRs).

• Respond to enquiries from telecom partners (including BICS) regarding suspicious traffic.

• Detect patterns related to:

  • SMS pumping

  • Artificial Inflation of Traffic (AIT)

  • Wangiri

  • Subscription fraud

  • Account takeover

  • SIM abuse

  • Premium-rate fraud

• Identify recurring fraud patterns.

• Suggest improvements to fraud detection rules.

• Help test new fraud controls developed by Product and Engineering.

• Document new fraud scenarios and emerging threats.

• Maintain investigation records.

• Produce fraud reports and operational KPIs.

• Share findings with the Revenue Assurance Manager and the CFO.

• Contribute to continuous improvement of fraud processes.

• 2–6 years of experience in Telecom Fraud, Revenue Assurance, Fraud Operations or Payment Fraud.

• Experience investigating suspicious customer behaviour.

• Strong analytical mindset.

• Good understanding of telecom usage (voice, SMS, destinations, traffic).

• Comfortable making operational decisions based on available information.

• Excellent written and spoken English.

• Experience with payment fraud.

• Experience with KYC or KYB reviews.

• Knowledge of telecom fraud typologies (IRSF, Wangiri, SMS pumping, AIT, subscription fraud, account takeover).

• Experience using SQL or BI tools.

• Experience working with telecom operators or CPaaS providers.

We are looking for someone who:

• Is curious and enjoys investigating unusual situations.

• Is comfortable working in a “startup” environment

• Can make pragmatic decisions with incomplete information.

• Is willing to perform operational and manual investigations when required.

• Has excellent attention to detail.

• Is organised and reliable.

• Communicates clearly and escalates issues appropriately.

• Is proactive in identifying fraud trends and proposing improvements.

• Works well as part of a collaborative team.

After the first six months, you will be able to:

• Independently investigate fraud cases.

• Identify suspicious customer behaviour with minimal supervision.

• Respond efficiently to partner enquiries.

• Contribute to improving fraud detection rules.

• Become a trusted operational partner for the Revenue Assurance, Finance and Product teams.

• Join a fast-growing international telecom company.

• Work on real telecom and payment fraud challenges.

• Collaborate with Product, Engineering, Customer Support and Finance.

• Develop expertise in one of the most dynamic areas of the telecom industry.

• Opportunity to grow into senior fraud, revenue assurance or risk management roles.