Billing Migration & Technical Specialist

Onecom is the UKs 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.

Were 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) youll 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.

• 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.

• 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.

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

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

We believe that diverse teams bring a range of experiences and better ideas that fuel innovation. Thats why were 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.