Senior Developer

Senior / Experienced Software Developer (VoIP / SIP)

Location : Guildford (Hybrid) – must live within a 2-hour commute

Salary : £55,000 – £65,000 (DOE)

An established technology business is looking for a Senior / Experienced Developer to join a small, specialist software team. You’ll help evolve an enterprise-level SIP platform and build secure, scalable services and integrations.

• Design, develop and enhance a SIP / VoIP platform and associated services
• Build REST APIs and value-add services
• Integrate with external systems including AI-driven voice, transcription and analytics services
• Troubleshoot SIP / RTP issues and improve platform reliability
• Contribute to secure development practices and compliance (ISO
  27001, PCI-DSS)

• Strong SIP / VoIP protocol knowledge (SIP, SDP, RTP)
• 5+ years’ experience with Python or another OO language
• REST APIs, Flask / Django and secure systems development
• Linux (Ubuntu), Docker and Git-based workflows
• Wireshark for SIP / RTP troubleshooting
• Excellent communication skills

• Free SWITCH, Kamailio or WebRTC
• C / C++, OAuth2 / Auth0
• CI / CD, Kubernetes, Mongo
  
  DB or MySQL

• 24 days’ holiday + bank holidays
• Hybrid Working (1 day per month in office)
• Pension, Life Insurance & Private Medical
• Birthday & volunteering day off
• Discounts & Cycle to Work scheme

The client is looking to fill this opportunity immediately, so please apply ASAP or feel free to drop me an email with any questions to owen @ serlimited . com.

SER-IN