Billing Migration & Technical Specialist

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

Why Join Us?

Onecom is the UK's leading business technology provider, shaping the way we work, connect, communicate and operate.

You will join a multi-award-winning company, with over 800 talented people committed to delivering great customer experiences driven by the Onecom Way; Think Kaizen, Be Respectful, Build Relationships, Make it Happen, Work Smart, Be Amazing.

About the role

We're looking for an experienced Billing Migration & Technical Specialist to play a key role in a major billing platform transformation. Working as the billing Subject Matter Expert (SME), you'll lead the migration of billing processes and logic from our incumbent platform, Tekton, to aBILLity, ensuring accuracy, governance, and a seamless customer experience throughout the transition.

This is a highly visible role, working across Finance, Technology, Operations and Product teams to ensure billing integrity, protect revenue, and support successful delivery of a business-critical programme.

What you'll be doing

• Analyse and document existing billing processes, rating structures, discounts, credits and invoicing logic within Tekton.

• Translate legacy billing logic into future-state requirements and configurations within 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, driving issues through to resolution.

• Collaborate with technical teams, business analysts, operational stakeholders and third-party suppliers.

• Produce comprehensive documentation covering migration rules, testing outcomes, controls and operational handovers.

• Support cutover planning, go-live activities and post-implementation hypercare.

What we're looking for

• 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.

Our dream candidate will also have

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

Perks for our people

Holidays: 25 days + bank holidays and buy/sell options

Other Leave: Birthday day off, 12 paid hours for flexible use, Volunteer day

Lifestyle: 9% combined pension contribution and 4x salary life assurance

Rewards: Quarterly and annual employee awards, discounts on tech

Development: In-House Training Academy

Wellbeing: 24/7 access to mental health support, discounted gym membership, free breakfast & fresh fruit, eye-care vouchers, financial wellbeing support

Everyone belongs at Onecom

We believe that diverse teams bring a range of experiences and better ideas that fuel innovation. That’s why we’re committed to creating an environment where everyone feels valued, respected, and able to bring their authentic selves to work. We welcome applications from people of all backgrounds, experiences, identities, and perspectives.