Communications Engineer

TERRA SYSTEMS PTE. LTD.; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

Terra Systems Pte Ltd in Singapore seeks an experienced Communications Engineer to design, secure and operate enterprise communications environments spanning voice, contact centres, networking, cybersecurity and AI-enabled communications.

You will configure Avaya and Cisco voice systems, implement secure networks with QoS, and integrate AI-powered features while migrating on-premises solutions to cloud or hybrid models. The role demands strong scripting and documentation skills.

Qualifications

• Minimum 3 years hands-on experience in voice/unified communications engineering.
• Experience with Avaya Aura and Cisco CUCM.
• Strong understanding of SIP/RTP, TCP/IP, QoS.
• Knowledge of AI-enabled communications and cloud contact centers is a plus.

Responsibilities

• Design, deploy and manage Avaya and Cisco voice systems and contact centres.
• Migrate on-premise voice platforms to cloud/hybrid models.
• Design and maintain enterprise LAN/WAN and QoS for real-time comms.
• Harden UC and network infrastructure with firewalls and SBCs.
• Implement AI-enabled communications like IVR, voicebots, transcription.
• Provide technical documentation and training for clients.

Skills

Unified communications

SIP/RTP/VoIP

Voice network design

Automation scripting (Python)

AI-enabled communications awareness

Education

Bachelor's degree in Computer Science or related field

Tools

Avaya Aura

Cisco CUCM

Firewall concepts

Session Border Controllers

Job description

Communications Engineer

About the Role

Job Title: Communications Engineer

Company: Terra Systems Pte Ltd

Location: Singapore

Employment Type: Full-Time

We are seeking an experienced Communications Engineer to design, secure and operate enterprise communications environments for our clients. The role spans voice and contact centre, enterprise networking, cybersecurity, and AI-enabled communications.

The ideal candidate brings strong system programming knowledge and experience, preferably with Avaya and Cisco telephony and contact centre expertise, solid networking and security fundamentals, and a keen interest in applying AI to customer and enterprise communications.

Key Responsibilities

Voice and Contact Centre

• Design, deploy and manage Avaya and Cisco voice systems, including PBX, VoIP, unified communications and contact centre platforms.
• Perform system upgrades, patches and configuration changes to ensure optimal performance and security.
• Support migration of on-premise voice and contact centre platforms to cloud and hybrid models.

Networking

• Design, configure and maintain enterprise LAN, WAN, SD-WAN and wireless networks supporting voice, video and data.
• Implement QoS, routing and switching policies that keep real-time communications reliable.
• Collaborate with infrastructure and cloud teams to integrate communications solutions with existing environments.

Cybersecurity

• Harden UC and network infrastructure using session border controllers, firewalls, segmentation, encrypted signalling and media (TLS/SRTP) and strong access control.
• Monitor for and respond to threats such as toll fraud, SIP attacks and denial-of-service; support vulnerability assessments, penetration tests and incident response.
• Ensure compliance with industry standards, client security policies and applicable regulations (e.g. PDPA, Cybersecurity Act).

AI and Automation

• Implement and integrate AI-enabled communications such as conversational IVR, voicebots and chatbots, speech analytics, real-time agent assist and transcription.
• Evaluate AI solutions for accuracy, security, data privacy and responsible use, including testing for misuse and prompt-injection risks.
• Automate configuration, monitoring and reporting using scripting and APIs.

General

• Troubleshoot and resolve complex issues across voice, network and security domains, ensuring minimal downtime and high availability.
• Provide technical documentation, training and support for internal teams and clients.

Requirements

• Minimum 3 years of hands‑on experience in voice or unified communications engineering, with exposure to enterprise networking and security.
• Strong expertise in system programming, preferably in Avaya Aura, Cisco Unified Communications Manager (CUCM) and related telephony solutions.
• Solid understanding of SIP, RTP and VoIP protocols, TCP/IP, routing and switching, VLANs and QoS.
• Working knowledge of network security: firewalls, session border controllers, VPNs, IDS/IPS and secure configuration practices.
• Familiarity with AI‑enabled communications tools (conversational AI, speech‑to‑text, LLM‑based assistants) and cloud contact centre platforms is a strong plus.
• Scripting and automation skills (e.g. Python, REST APIs) are an advantage.
• Experience with IVR systems and voice recording platforms is a plus.
• Excellent problem‑solving skills and ability to work under pressure.

Certifications (highly desirable)

• Voice and collaboration: Avaya Certified Specialist, Cisco CCNP Collaboration
• Networking: Cisco CCNP Enterprise or equivalent
• Security: CCNP Security, CompTIA Security+, CISSP or equivalent
• AI and cloud: vendor certifications in AI or cloud platforms (e.g. Microsoft Azure AI Engineer, AWS)

Why Join Us?

Work where communications, networking, cybersecurity and AI converge, on projects for enterprise and public‑sector clients.

Gain exposure to national‑level cybersecurity and AI safety initiatives in Singapore.

Competitive salary and benefits package.

Career growth and professional development, including sponsored certifications.