Voice platform Engineer

Key Responsibilities

VoIP Platform & Device Management

• Manage and support VoIP platform Qualification, such as registration / monitoring / calling / billing capabilities
• Configure, provision, and maintain ATA devices, specifically Polycom ATA 400.
• Perform remote device provisioning and lifecycle management using TR-069.
• Troubleshoot SIP signaling, TLS security, and voice traffic issues.

Large-Scale Migrations & Validation

• Lead and support large-scale customer migrations (tens of thousands of users) from legacy voice platforms to modern VoIP stacks.
• Validate end-to-end provisioning, peering, and service operability post-migration.
• Perform pre- and post-migration data validation to ensure accuracy and completeness.

Automation & Scripting

• Develop scripts (primarily Python) to automate:
  • Sequences of REST API calls
  • Validation workflows
  • Error detection and reporting
• Support automation for testing, provisioning validation, and operational checks.
• Work in Linux environments to support scripts and system operations.

API & Integration Work

• Validate data exchanged between vendor-provided devices, vendor APIs, and internal systems.
• Use REST APIs and tools such as Postman to test, validate, and debug integrations.
• Create or support APIs for internal system consumption of validated data.

Data Analysis & Troubleshooting

• Write SQL queries for data collection, analysis, and reconciliation. Experience with BigQuery and Looker studio prefferred
• Use Wireshark / packet capture tools to troubleshoot TCP/IP, SIP, and TLS issues.
• Collaborate with vendors, engineering teams, and operations teams to resolve issues.

Mandatory Skills (Must-Have)

Telephony & Networking

• Strong VoIP experience
• ATA device experience (mandatory), specifically Polycom ATA 400
• SIP & TLS
• TCP/IP fundamentals
• Wireshark / packet capture

Device Provisioning

• TR-069 (remote provisioning and device management)

Automation & Cloud

• Python scripting
• General scripting (Shell/Bash)
• Linux system administration
• Google Cloud Platform (Google Cloud Platform) experience

APIs & Data

• REST APIs
• Postman
• SQL (data validation and analysis)

Domain Background

• Experience working in a Telecom / ISP / ITSP environment

Nice-to-Have Skills

• Cloud certifications (Google Cloud Platform preferred)
• Experience with large-scale telecom customer migrations
• Vendor integration and coordination experience
• Exposure to voice platform transitions (legacy third-party VoIP platforms)

Ideal Candidate Background

• Telephony / VoIP Engineer
• Telecom Platform Engineer
• ITSP / ISP Engineer
• VoIP Automation or Migration Engineer

CST provides its clients with complete, cost-effective, end-to-end personnel solutions across a range of industrial domains. CST's mission is to empower businesses around the world to make better, faster operational decisions.