Billing Migration & Technical Specialist

Onecom

12d

About The Position

Onecom is seeking an experienced Billing Migration & Technical Specialist to support a major billing platform transformation. As the billing Subject Matter Expert, you will lead the migration of billing processes and logic from the incumbent Tekton platform to aBILLity, ensuring accuracy, governance and a seamless customer experience. This visible, business-critical role works across Finance, Technology, Operations and Product to maintain billing integrity, protect revenue and support successful programme delivery. The role includes analysing and documenting existing billing processes, translating legacy logic into future-state requirements and configurations, and supporting data migration readiness. You will lead billing validation, reconciliation, parallel-run testing and user acceptance testing; identify and resolve risks and gaps; and prepare documentation and operational handovers. You will also support cutover, go-live and post-implementation hypercare. Onecom describes itself as the UK's leading business technology provider and a multi-award-winning company with over 800 people. It emphasizes customer experience and its Onecom Way: Think Kaizen, Be Respectful, Build Relationships, Make it Happen, Work Smart, Be Amazing. The company welcomes applicants from all backgrounds, experiences, identities and perspectives.

Requirements

Proven experience supporting billing system migrations, transformation programmes or platform replacements.
Hands-on experience with aBILLity billing systems.
Excellent understanding of billing logic, tariffs, recurring and usage charges, discounts, bundles and invoice cycles.
Strong experience working with Finance teams on billing assurance, reconciliations and revenue-impacting decisions.
Ability to analyse complex data and trace billing outcomes back to source systems and business rules.
Excellent stakeholder management, communication and documentation skills.

Nice To Haves

Strong experience in telecoms billing environments, ideally covering mobile, fixed-line, connectivity, managed services or subscription-based services.

Responsibilities

Analyse and document existing billing processes, rating structures, discounts, credits and invoicing logic in Tekton.
Translate legacy billing logic into future-state requirements and configurations in aBILLity.
Support data mapping, cleansing, transformation and migration-readiness activities.
Lead billing validation, reconciliation, parallel-run testing and user acceptance testing.
Identify migration risks, billing gaps and process improvements, and drive issues through to resolution.
Collaborate with technical teams, business analysts, operational stakeholders and third-party suppliers.
Produce documentation covering migration rules, testing outcomes, controls and operational handovers.
Support cutover planning, go-live activities and post-implementation hypercare.