Solutions Engineer — Cellusys, Dublin

Fernando Bustamante

I help mobile operators secure and optimise the signalling their networks run on — designing, deploying and integrating telecom software across SS7, Diameter, GTP and 5G.

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Domains

What I work on

Signalling security
Protecting SS7, Diameter and GTP interconnects against location tracking, fraud and interception — the firewalls, the rule sets, and the traffic analysis that justifies both.
Roaming and 5G
Steering of Roaming, anti-steering detection and roaming welcome messaging, alongside the shift from legacy signalling to 5G service-based interfaces.
Integration and delivery
Deployments inside live operator networks: interoperability testing, acceptance, and the long tail of making a new system fit an estate that was never designed for it.
Engineering and communication
Clojure, Java and JavaScript on the build side. Clear requirements, honest timelines and documentation people actually read on the customer side.

Selected work