Billing Transformation Specialist — Platform Migration

Onecom; Winchester; On-site; GBP 55,000 - 75,000; Full time

Benefits offered by this job

Holidays 25 days

Birthday day off

Pension scheme

Life assurance 4x salary

Employee awards

In-House Training Academy

Wellbeing support

Free breakfast & fruit

Eye-care vouchers

Financial wellbeing support

Job summary

Onecom, the UK\'s leading business technology provider, is seeking a Billing Migration & Technical Specialist to drive the major platform transformation from Tekton to aBILLity. You\'ll act as the billing SME across Finance, Tech, Operations and Product, ensuring accuracy and governance throughout the transition.

You\'ll lead migration, validation and testing activities, map legacy logic to future state, and produce comprehensive migration documentation while mitigating risks and enabling a

Qualifications

• Proven experience supporting billing system migrations or platform replacements.
• Hands-on experience with aBILLity billing systems.
• Strong understanding of billing logic, tariffs, discounts, and invoicing cycles.
• Experience partnering with Finance on reconciliations and revenue-impacting decisions.
• Ability to analyse complex data and map to business rules.

Responsibilities

• Analyse and document existing Tekton billing processes, rating structures, discounts and invoicing logic.
• Translate legacy billing logic into future-state requirements for aBILLity.
• Support data mapping, cleansing, transformation and migration readiness.
• Lead billing validation, reconciliation, parallel-run testing and UAT.
• Identify migration risks and process improvements, driving resolution.
• Collaborate with technical teams, analysts, stakeholders and suppliers.
• Produce documentation covering migration rules, testing and controls.
• Support cutover planning, go-live activities and post-implementation hypercare.

Skills

Billing migration

Stakeholder management

Documentation

Data analysis

Tools

aBILLity

Tekton

Job description

Onecom, the UK\'s leading business technology provider, is seeking a Billing Migration & Technical Specialist to drive the major platform transformation from Tekton to aBILLity. You\'ll act as the billing SME across Finance, Tech, Operations and Product, ensuring accuracy and governance throughout the transition.

You\'ll lead migration, validation and testing activities, map legacy logic to future state, and produce comprehensive migration documentation while mitigating risks and enabling a