Job Description

Why this job matters
Telecom mediation and rating platforms process billions of events every single day-usage records, network events, charging inputs, partner settlements, and more. These events must be collected, confirmed, transformed, enriched, and delivered with absolute accuracy and reliability. Even a small failure can lead to revenue leakage, incorrect billing, compliance issues, customer dissatisfaction, or fraud exposure.
This role ensures that every event flowing through BT's networks is captured, processed, rated, and handed off correctly to downstream systems including Billing, Assurance, Fraud Management, and MIS platforms. The software you build and maintain directly shield BT's revenue, operational integrity, and customer trust.
By ensuring high throughput, fault liberal, and secure mediation and rating processes, this role plays a pivotal part in enabling BT to bill accurately, detect anomalies quickly, make data driven decisions, and deliver seamless customer experiences across all services. In short: you keep the business running, the revenue secure, and the network intelligent.
What you'll be doing

• Technical Solution Delivery

Supports the implementation of technical solutions for internal and external customers across telecom mediation flows, resolving inter system issues and contributing within cross functional squads.

• Architecture & Technology Choices

Contributes to technical decisions, technology selection, and architecture direction for high performance mediation platforms, balancing immediate product needs with long term transformation.

• Software Plan & Development

Supports the plan and development of software components aligned with enterprise architecture and BT's security standards.

• Continuous Learning & Technical Reviews

Undertakes code and plan reviews to enhance proficiency and ensure alignment with software engineering principles and industry standards.

• Technical Specifications & Low Complexity Builds

Helps plan technical specifications and develops software solutions for smaller or less complex initiatives, ensuring high quality delivery.

• Coding & Testing

Writes, tests, debugs, and reviews code under supervision, ensuring clarity and quality across engineering teams.

• Systems Integration

Integrates existing software products and resolves routine issues to ensure interoperability across diverse platforms and mediation layers.

• Defect Management

Monitors, troubleshoots, and corrects software defects to ensure platform reliability and service stability.

• Tooling & Automation

Supports the implementation, optimization, and maintenance of CI/CD pipelines and automation tooling that improve developer efficiency and accelerate delivery.

• Technical Roadmap Contribution

Supports delivery of a forward-looking technical roadmap that meets needs of engineering teams, operations, and business stakeholders.

• Engineering & Operational Excellence

Assists in defining and implementing metrics, processes, and continuous improvement initiatives to drive engineering maturity.

• Process Improvement

Contributes to refining and optimizing engineering ways of working within the software engineering domain.
Skills Required
OCOMC / Offline Mediation Controller
Expertise in Oracle OCOMC/ONM (v6/12/15), including:

• Cartridge development (EEs, PO components, Chains, Pipelines)
• NPL scripting for transformations, enrichment, correlation
• CDR parsing, normalization, aggregation, file collection/distribution
• High throughput processing of multi network event types
• Deployment, tuning, and troubleshooting of mediation workflow

Java & Related Technologies

• Strong Java/J2EE development background
• Experience with REST APIs, multi-threaded processing, concurrency
• Scripting (Shell/Python/Perl) for automation, tooling, and monitoring

WebLogic Application Server

• Deployment and tuning of Java applications
• JVM performance optimization
• Cluster management, JDBC tuning, thread pool configuration
• Troubleshooting memory leaks, stuck threads, connection issues

Netcracker Revenue Manager (NCRM / NC-RM) - Rating & Charging or Equivalent
Hands-on experience with the Netcracker Revenue Manager or equivalent rating ecosystem, including:

• Understanding of Netcracker Rating Engine or equivalent, charge calculation flows
• Configuration of price plans, rating rules, usage types, event models
• Mapping mediation output (OCOMC files/events) into Netcracker or equivalent ingestion formats
• Debugging rating discrepancies, charge calculation issues, and missing usage events
• Working with product catalog, tariff models, charging rules, and discounts
• Ensuring seamless Mediation ? NCRM (or equivalen) ? Billing alignment
• Knowledge of batch vs. near-real-time rating workflows

Telecom Network Feed Formats
Strong understanding of telecom event structures that feed Mediation + Rating:

• Diameter (CCR/CCA) for charging flows
• ASN.1 CDRs
• TAP / RAP / NRTRDE for roaming
• 3GPP CDR formats (VoLTE, 5G, GTP', SIP, CAMEL, etc.)
• IPDR
• Vendor-specific formats (Huawei, Ericsson, Nokia, Cisco)
• Ability to decode, interpret, map, and troubleshoot raw network events

CI/CD, Automation & Observability

• Building CI/CD pipelines (Jenkins, Git, Maven, Nexus etc.)
• Automated deployment of OCOMC cartridges and Java services
• Writing monitoring scripts (Shell/Python) for throughput, lag, error rates
• Working with observability platforms (Grafana, Prometheus, ELK, OEM, Dynatrace)

Billing, Rating & ETL Knowledge

• Understanding of how mediation outputs feed into:

- Rating engines
- Billing and invoicing systems
- Assurance & analytics systems
- Revenue assurance & fraud management platforms

• Ability to detect anomalies in event flows that can lead to revenue leakage

Experience Required

• 5-8 years of hands-on software development experience with strong proficiency in Java and related technologies (J2EE, WebLogic, REST APIs, databases, scripting).
• Minimum 5 years of deep, practical experience in delivering OCOMC (Offline Mediation Controller) solutions, including cartridge development, NPL scripting, mediation and rating workflows, CDR processing, and production deployments.
• Proven experience in building, enhancing, and maintaining high volume mediation pipelines capable of processing billions of daily events with high accuracy, low latency, and strong fault tolerance.
• Strong exposure to telecom network event formats such as Diameter, ASN.1, TAP/RAP/NRTRDE, IPDR, and various 3GPP CDR structures, with the ability to analyse, decode, and map raw feed data.
• Hands on expertise with CI/CD pipelines using tools like Jenkins, Git, Maven, Nexus, or equivalent-covering build automation, artifact management, testing, deployment workflows, and rollback strategies.
• Solid experience in production system problem solving, including issue triage, deep-dive debugging, RCA creation, and working closely with operations to ensure system stability.
• Experience creating and maintaining monitoring and observability scripts (Shell/Python, Dyantrace), integrating with tools like Grafana, Prometheus, ELK, OEM, or custom dashboards to track throughput, error rates, latency, and system health.
• Demonstrated ability to work on complex, large-scale distributed systems, particularly those involving high-volume ETL flows into Billing, Assurance, Fraud, and MIS platforms.
• Experience collaborating in cross-functional squads, working in Agile environments, and contributing to improvement initiatives related to automation, performance tuning, and resiliency.

Our leadership standards
Looking in:
Leading inclusively and Safely
I inspire and build trust through self-awareness, honesty and integrity.
Owning outcomes
I take the right decisions that benefit the broader organisation.
Looking out:
Delivering for the customer
I execute brilliantly on clear priorities that add value to our customers and the wider business.
Commercially savvy
I demonstrate strong commercial focus, bringing an external perspective to decision-making.
Looking to the future:
Growth mindset
I experiment and identify opportunities for growth for both myself and the organisation.
Building for the future
I build diverse future-ready teams where all individuals can be at their best.
About us
BT Group was the world's first telco and our heritage in the sector is unrivalled. As home to several of the UK's most recognised and cherished brands - BT, EE, Openreach and Plusnet, we have always played a critical role in creating the future, and we have reached an inflection point in the transformation of our business.
Over the next two years, we will complete the UK's largest and most successful digital infrastructure project - connecting more than 25 million premises to full fibre broadband. Together with our heavy investment in 5G, we play a central role in revolutionising how people connect with each other.
While we are through the most capital-intensive phase of our fibre investment, meaning we can reward our shareholders for their commitment and patience, we are absolutely focused on how we organise ourselves in the best way to serve our customers in the years to come. This includes radical simplification of systems, structures, and processes on a huge scale. Together with our application of AI and technology, we are on a path to creating the UK's best telco, reimagining the customer experience and relationship with one of this country's biggest infrastructure companies.
Change on the scale we will all experience in the coming years is unprecedented. BT Group is committed to being the driving force behind improving connectivity for millions and there has never been a more exciting time to join a company and leadership team with the skills, experience, creativity, and passion to take this company into a new era.
A FEW POINTS TO NOTE:
Although these roles are listed as full-time, if you're a job share partnership, work reduced hours, or any other way of working flexibly, please still get in touch.
We will also offer reasonable adjustments for the selection process if required, so please do not hesitate to inform us.
DON'T MEET EVERY SINGLE REQUIREMENT?
Studies have shown that women and people who are disabled, LGBTQ+, neurodiverse or from ethnic minority backgrounds are less likely to apply for jobs unless they meet every single qualification and criteria. We're committed to building a diverse, inclusive, and authentic workplace where everyone can be their best, so if you're excited about this role but your past experience doesn't align perfectly with every requirement on the , please apply anyway - you may just be the right candidate for this or other roles in our wider team.

Skills Required