Senior Software Engineer: SIP Platform & AI‑Driven APIs

OPR Resourcing Specialists; Guildford; Hybrid; GBP 55,000 - 65,000; Full time

Job summary

A prominent UK technology firm based in Guildford is seeking an experienced Senior Software Developer to expand their Software Development Team. This hybrid role involves designing and enhancing a large-scale SIP platform while developing integrations with modern AI-driven systems. Ideal candidates will have over 5 years experience in Python, a strong understanding of SIP/VoIP protocols, and a commitment to secure systems design. The position offers competitive salary and excellent benefits including 24 days of annual leave and private medical insurance.

Benefits

24 days annual leave plus bank holidays

Pension and life insurance

Private medical insurance

Birthday and volunteering day off

High street discount vouchers

Qualifications

• 5+ years experience in Python or another object-oriented language.
• Strong knowledge of SIP / VoIP protocols.
• Experience with secure systems design and development.

Responsibilities

• Design and enhance an enterprise SIP platform.
• Develop integrations with third-party systems.
• Collaborate with developers to deliver scalable solutions.

Skills

SIP / VoIP and related protocols

Python or another object-oriented language

Object-oriented design principles

HTTP / RESTful APIs

Flask or Django

Secure systems design

SIP / RTP troubleshooting

Git / GitHub

Docker containerisation

Linux (Ubuntu-based) environments

Full driving licence with car

Job description

A prominent UK technology firm based in Guildford is seeking an experienced Senior Software Developer to expand their Software Development Team. This hybrid role involves designing and enhancing a large-scale SIP platform while developing integrations with modern AI-driven systems. Ideal candidates will have over 5 years experience in Python, a strong understanding of SIP/VoIP protocols, and a commitment to secure systems design. The position offers competitive salary and excellent benefits including 24 days of annual leave and private medical insurance.