Work
25 write-ups. Stacks, constraints, and what was true after. Clients are anonymised where they have not agreed to be named. No invented percentages.
25 programmes
Telecom · Cerillion, source BSS, catalog, bill cycles
A UK operator
Catalogs, accounts, and billing cycles moved onto Cerillion while the source stack stayed live. Parallel runs, then a rehearsed cutover. The first cycle on Cerillion was not the first time those invoices had been produced.
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Telecom · Comverse One, OCS, recharges, prepaid offers
A European prepaid operator
Comverse One and online charging cut over without dropping recharges. Rating, balances, and voucher flows were rehearsed against live-shaped traffic before the first prepaid event on the new path.
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Telecom · Kubernetes, Zabbix, BSS jobs, NOC tickets
A European operator
BSS jobs moved onto Kubernetes. Zabbix watched cluster, node, GPU, and job health. Alerts became tickets in the NOC, not graphs someone happened to have open.
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Telecom · Local LLM, RAG, runbooks, historic tickets
A UK billing operations team
A local model over runbooks and historic tickets. Agents get cited answers on the floor. Subscriber and billing data do not leave the operator network.
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Digital services · CRM, payments, self-care, internal consoles
A European digital service provider
Self-care and internal consoles rebuilt around the jobs that close a ticket: top-up, catalog lookup, payment status. The screens sit on the live stack.
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A UK mobile operator
SMS charged through Comverse OCS over Diameter. Premium and bulk events had to rate the same after the SMSC change, without a silent drop of MO/MT charging.
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Telecom · Nokia core, Ericsson core, VoLTE, 4G
A UK operator
Legacy Nokia core nodes replaced with Ericsson while VoLTE and 4G stayed up. Provisioning and charging kept a single subscriber truth through the move.
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Telecom · OCS, Ericsson core, 5G NSA/SA, policy
A European operator on 5G
Online charging extended for 5G NSA then SA. Rating and policy had to survive new session types without rewriting every prepaid offer.
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Telecom / enterprise · OCS, billing, ERP, customer balances
A UK finance and billing team
OCS, billing, and ERP stopped being three versions of the customer balance. Night jobs produce a difference file with owners, not a spreadsheet in someone's inbox.
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