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Javascript Software Engineer
Job summary
A tech firm in Salford is seeking a JavaScript Software Engineer to lead the development of a robust telephony infrastructure. The role involves designing and integrating JavaScript-based dial pad UIs with PJSIP, alongside handling real-time communication concerns. Ideal candidates will have strong JavaScript skills, experience with VoIP, and proficiency in Linux environments. Competitive salary up to £60,000, along with benefits including annual leave and career development opportunities.
Benefits
Qualifications
- Strong experience with JavaScript for both Node.js and browser applications.
- Hands-on experience with PJSIP / pjproject.
- Solid understanding of VoIP and SIP fundamentals.
Responsibilities
- Design and build a JavaScript-based dial pad UI using modern frameworks.
- Integrate the frontend dial pad with PJSIP backend services.
- Develop real-time event-driven systems supporting voice calling.
Skills
Tools
DCS Technology are searching for a JavaScript Software Engineer to join our client and lead the delivery of a JavaScript-driven robust telephony infrastructure. This role offers the opportunity to work deeply with real-time communications technology, influencing architecture, performance, and user experience in a production environment.
- Design and build a JavaScript-based dial pad UI, using modern frameworks such as React, Vue, or vanilla JavaScript.
- Integrate the frontend dial pad with a backend PJSIP / pjproject SIP stack via services or bindings.
- Develop and maintain real-time, event-driven systems supporting voice calling and signalling.
- Work with WebRTC and ensure effective interoperability with SIP-based systems.
- Handle real-time audio concerns including microphone input, speaker output, echo cancellation, and latency optimisation.
- Collaborate on the design and implementation of SIP call flows, media handling, and call state management.
- Debug SIP signalling and media streams using tools such as Wireshark and SIP trace utilities.
- Ensure systems are secure, implementing best practices around TLS, SRTP, and authentication.
- Deploy and support services in Linux-based environments, ensuring stability and performance.
- Produce and maintain clear technical documentation aligned with development standards and change processes.
- Strong JavaScript experience (Node.js and/or browser-based applications).
- Hands-on experience integrating PJSIP / pjproject via backend services or bindings.
- Solid understanding of VoIP fundamentals, including SIP, SDP, RTP/RTCP, codecs, and DTMF.
- Experience working with WebRTC and SIP interoperability.
- Proven ability to design and implement responsive, user-friendly dial pad interfaces.
- Experience building event-driven, real-time systems using WebSockets and asynchronous workflows.
- Familiarity with SIP servers such as Asterisk or FreeSWITCH.
- Strong debugging skills across signalling and media layers.
- Comfortable working in Linux environments.
- Good understanding of security principles relevant to VoIP and real-time communications.
Salary: Up to £60,000
Benefits: Paid annual leave, pension, wellbeing perks and more
Career Development: Opportunities to grow with a company undergoing rapid expansion across multiple sectors
Please submit your CV to Meg Kewley at DCS Engineering via the link provided.
Alternatively, email me at or call 0161 212 2308.
DCS Recruitment and all associated companies are committed to creating a working environment where diversity is celebrated and everyone is treated fairly, regardless of gender, gender identity, disability, ethnic origin, religion or belief, sexual orientation, marital or transgender status, age, or nationality
* The salary benchmark is based on the target salaries of market leaders in their relevant sectors. It is intended to serve as a guide to help Premium Members assess open positions and to help in salary negotiations. The salary benchmark is not provided directly by the company, which could be significantly higher or lower.