Radius Limited
Voice Engineer
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Job Description
We're looking for an experienced Voice Engineer to join our IT Operations team.
This role is responsible for the design, implementation, support, and continuous improvement of our voice and telephony platforms.
You'll play a key role in delivering resilient, secure, and high-performing voice services across the business, working with SIP-based communications, contact centre technologies, carrier connectivity, voice infrastructure, call routing, and telephony integrations.
Whilst we use Five9 at Radius, we're equally interested in candidates who have supported comparable enterprise telephony or contact centre platforms. The key requirement is strong SIP and VoIP expertise and the ability to troubleshoot and optimise complex voice environments.
This role is based alongside the team in Crewe, with a hybrid pattern of 3 days per week in the office.
What you'll be doing...
- Design, deploy, and maintain enterprise voice and unified communications platforms.
- Manage SIP trunks, Session Border Controllers (SBCs), call routing, and dial plans.
- Support cloud telephony platforms, including contact centre solutions.
- Maintain voice platform availability, resilience, and performance.
- Investigate and resolve voice-related incidents and service requests.
- Diagnose SIP signalling, media flow, and call quality issues.
- Work with telecommunications providers and vendors to resolve carrier issues.
- Perform root cause analysis and implement preventative measures.
- Support voice network requirements, including QoS, firewalls, routing, and security.
- Assist with telephony migrations, platform upgrades, and transformation projects.
- Support disaster recovery and business continuity requirements for voice services.
- Proactively monitor voice environments and service performance.
- Identify opportunities to improve call quality, reliability, and operational efficiency.
- Produce reports on service availability, utilisation, and performance metrics.
- Maintain technical documentation, architecture diagrams, and operational procedures.
- Develop and maintain voice engineering standards and best practices.
- Support audit, compliance, and security requirements relating to voice services.
What we're looking for...
- Proven experience of enterprise-level voice and collaboration platforms and call recording and reporting solutions.
- Strong experience supporting SIP-based voice solutions.
- Knowledge of Microsoft Teams phone including direct routing and Operator Connect.
- Excellent understanding of SIP signalling, RTP, and VoIP technologies.
- Experience with Session Border Controllers.
- Knowledge of carrier connectivity, SIP trunking, and number management.
- Experience supporting cloud telephony and contact centre platforms.
- Ability to troubleshoot complex voice and call quality issues.
- Strong networking fundamentals including TCP/IP, DNS, DHCP, VLANs, QoS, firewalls, and routing.
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What you can expect from us...
Meaningful work
This is an opportunity to take ownership of a business-critical voice environment and play a key role in shaping the future of telephony and contact centre services across the organisation. You'll work across modern voice technologies, SIP infrastructure, and cloud contact centre platforms, helping to drive reliability, performance, and continuous improvement.
A standout workspace
Based in our offices in Crewe, you’ll enjoy modern, collaborative workspaces, compete with café and free onsite gym.
Career development
Your impact on Radius will be rewarded with the opportunity to progress your career in many directions.
The development of our people has always been a priority for us. We have established a culture of continuous learning and knowledge-sharing which means our colleagues are constantly exposed to new experiences and ways of working.
Everyone in Radius, from entry-level to the senior team, has their own personal development plans with clear routes for progression and regular reviews.
Rewards and benefits
In addition to a competitive salary, you’ll have access to a reward and benefits package which includes:
- Pension
- Life assurance
- Employee fuel card scheme
- Electric Vehicle scheme
- Employee assistance programme
- Wellness and healthcare assistance via ‘Help@Hand’ by Unum
- Cycle to work’ scheme
- Free breakfast daily in the office
- Free onsite gym access
About Radius...
Driving business forward
Radius offers fuel cards, telematics, vehicle leasing, EV charge points, telecoms, and more to businesses globally.
Established in 1990, we're trusted by over 470,000 businesses to help them grow and become more productive.
With over 3000 colleagues across 5 continents, our people are critical to our success as we develop new innovative products across a growing range of businesses.
Our values...
- Driven - We are ambitious and tenacious. We constantly strive for more, we look to the future, and we are already working on what’s next.
- Agile - We are quick to adapt to change. We stay ahead of market trends and create solutions for the future.
- Innovative - The status quo is there to be challenged. We are passionate about pushing boundaries and always think bigger.
- Inclusive - We know the value of our customers, partners, suppliers, and colleagues. We encourage inclusivity and work collaboratively.
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Diversity, Equality & Inclusion at Radius
Our global DEI networks champion LGBTQ+ inclusion, cultural diversity, women’s empowerment, and mental health, neurodiversity, and disability support.
We also offer:
- Global Female Health Policy & Female Health Champions
- Pregnancy Loss and Fertility Treatment Policies
- Endometriosis Friendly Employer (UK)
- Women-focused gym & female health events
- Mental Health First Aiders
- Disability Confident Committed Employer (Level 1)
- Race at Work Charter signatory
- Proud sponsor of Crewe Pride (5 years running) and Cheshire Pride Awards Corporate Supporter 2025
- Community network driving charity and volunteering initiatives, with 8 consecutive years of participation in the UK Challenge.
- Give as you earn scheme (payroll giving) and match funding
Next Steps
If you feel we are a good match for each other, you can apply online now!
If you’d like to understand more about the role or life at Radius before applying, then please contact our talent team directly.
Radius is an equal opportunities employer. We are committed to welcoming people regardless of age, disability, gender identity, race, faith or belief, sexual orientation, or socioeconomic background.
We are committed to ensuring an inclusive and accessible recruitment process for all candidates. If you require any adjustments or accommodations at any stage of the process, please let us know, and we will do our best to support you.
We reserve the right to close a vacancy before the closing date in the event of an overwhelming response or a change in business priorities.
Note to recruitment agencies:
We do not accept speculative recruitment agency CVs or profiles. Any unsolicited CV received by Radius will be treated as a gift and not eligible for an agency fee.
PSL agencies should only send CVs via our Applicant Tracking System, when approved to do so by the Radius Talent Team.
Department: Technology & Data
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