Salary: £65,000 - 65,000 per year Requirements:
* We are looking for a candidate with at least 5 years of experience building and operating VoIP systems using communication protocols such as UDP, SIP, and RTP. You should have strong hands-on experience with Softswitch, OpenSIPs, and RTPEngine, along with solid expertise in SIP signaling, RTP, and media relay techniques. Experience with Session Border Controllers, Media Servers, and WebRTC is essential. You should have a robust understanding of managing telephony infrastructure for uptime, latency, and call quality optimization. Strong systems programming and debugging skills in C/C++ are required, along with excellent debugging proficiency using diagnostic tools such as Wireshark and tcpdump. Experience working with geographically distributed infrastructure or high-availability deployments is a plus.
* In-depth knowledge of Linux, preferably Ubuntu, is necessary, along with the ability to script with Bash, Shell, or Python. Strong proficiency in MySQL database design and access, including replication techniques from a C/C++ environment, is important. Additionally, we value real-time, multi-threading development experience, ideally in producing asynchronous communication products or solutions. Familiarity with best practices in a development environment, including knowledge of version control systems (e.g., CVS, GIT) and unit testing frameworks (e.g., GTest) is essential. Understanding data caching options in a Linux environment with demonstrable practical application is also required. A good knowledge of software design patterns and system architectures will be beneficial.
Responsibilities:
* In this hands-on role, your key responsibilities will include designing, developing, and testing new software aligned to our product roadmap to meet the evolving needs of our key markets. You will maintain and improve the existing software codebase and processes. Additionally, you will perform technical troubleshooting to diagnose and resolve problems, identifying opportunities for enhanced performance and operations through programming and scripting.
* You will refine and automate regular processes, track issues, and document changes while ensuring audit trails are maintained and documented. Assisting with the management and administration of infrastructure across our data centers in a 24/7 critical production environment will also be part of your duties. This includes managing the configuration, maintenance, and upgrades to operating systems, databases, and processes while monitoring system health and performance to ensure the highest levels of performance, availability, and security.
* Your role will involve sharing technical expertise by providing mentorship and cross-training to peers and other team members. You will also perform scheduled maintenance and support release deployment activities after core hours while producing and maintaining detailed project, policy, and procedural documentation.
Technologies:
* Bash
* Git
* Support
* Linux
* Mobile
* MySQL
* Python
* Security
* Ubuntu
* C++
More:
We are proud to offer a competitive salary of up to £65,000, alongside a generous benefits package, which includes 21 days of holiday (increasing to 25 days after five years), an extra day off for your birthday, a buy holiday scheme, an Employee Assistance Programme, free onsite parking, enhanced company sick pay, discounted retail vouchers, reduced gym membership, an annual salary review, an SCG mobile benefit, and an employee referral bonus. Additionally, we provide an onsite canteen that offers free croissants and freshly made soup.
Please note that this role does not provide visa sponsorship opportunities; all candidates must have the right to work in the UK. We are an equal opportunity employer, committed to diversity and inclusivity. We welcome applications from all parts of the community and are dedicated to the principles of the Equality Act 2010, actively supporting applicants with disabilities and ensuring a fair and accessible recruitment process.
last updated 36 week of 2025