Telephony & SIM Box Specialist (Fintech)

TL;DR

Telephony & SIM Box Specialist (VoIP/Fintech): Designing and maintaining SIM box hardware and VoIP infrastructure for voice and SMS traffic routing with an accent on SIP trunks, PBX systems, and network optimization. Focus on managing multi-operator environments, ensuring telecom regulatory compliance, and optimizing call quality metrics across global markets.

Location: National Capital Region, Philippines

Company

A fast-growing fintech company transforming the financial services landscape in the Philippines by offering fair and accessible digital lending products.

What you will do

• Design, deploy, and maintain SIM box hardware and software platforms for voice and SMS traffic routing.
• Manage VoIP infrastructure including SIP trunks, PBX systems (Asterisk, FreePBX, 3CX, Kamailio), and media gateways.
• Configure GSM gateways and SIM rotation policies for multi-operator environments.
• Administer Microsoft Azure and Active Directory services, including user roles, permissions, and email integration.
• Manage network hardware (switches, firewalls, routers) and implement QoS policies to prioritize voice traffic.
• Monitor call quality metrics (ASR, ACD, NER) and ensure compliance with local telecom regulations across multiple markets.

Requirements

• Degree or diploma in IT, Computer Science, Telecommunications, or a related field.
• 3+ years of experience in IT operations or system administration.
• 2+ years of focused experience with telephony systems, SIM box platforms, or VoIP infrastructure.
• Deep expertise with GoIP hardware, SIP protocol, and PBX platforms.
• Hands-on experience with Microsoft Azure and Active Directory.
• Strong knowledge of network configuration, including VLANs, VPNs, and firewalls.

Nice to have

• Experience with A2P SMS routing and OTP delivery infrastructure.
• Familiarity with CDR (Call Detail Records) analysis and billing reconciliation.
• Knowledge of telecom fraud patterns and mitigation strategies.
• Experience with Jira Service Management and Confluence.

Culture & Benefits

• Opportunity to contribute to a promising international company backed by Breeze Ventures.
• Mission-driven environment focused on promoting financial inclusion and literacy.
• Collaborative culture working across multiple geographies (PH, SA, KE, UAE, BH, MY).