Senior Infrastructure Engineer

Job Overview

This position is based in Prague, Czech Republic, and supports CallMiner's Intelligent CX Automation platform serving customers throughout Europe and globally. As part of the CallMiner Engineering and Operations Team, the DevOps System Administrator is responsible for the reliability, security, and performance of the infrastructure that delivers CallMiner's intelligent CX automation solutions to enterprise customers, including OmniAgent.

Key Responsibilities

• Administer, monitor, and maintain customer-facing cloud infrastructure (Azure and/or AWS, OVH Cloud) supporting CallMiner's intelligent CX automation platform


• Own SIP telephony integrations for customer deployments: configure and maintain connectivity via SIP trunking providers, direct trunks, and customers' enterprise telephony infrastructure (PBX, SBC, CCaaS platforms)


• Design reliable call paths balancing latency, audio quality, reliability, and security constraints


• Diagnose and resolve complex telephony and connectivity issues across customer environments, including call routing, NAT traversal, codec compatibility, RTP/audio quality, firewall and QoS configuration


• Ensure high availability, low latency, and resilience of real-time voice and conversational AI services


• Support customer onboarding and go-lives in coordination with Delivery and Professional Services teams, from proof-of-concept through production


• Manage containerized workloads and orchestration platforms (Docker, Kubernetes)


• Lead incident response and root cause analysis for infrastructure, telephony, and connectivity issues


• Perform routine system administration tasks including patching, backups, disaster recovery testing, user and access management, and capacity planning


• Harden systems and enforce security best practices, supporting compliance requirements (e.g., ISO 27001, GDPR, SOC 2) and audit activities


• Manage databases, networking, DNS, load balancing, certificates, and VPN/firewall configurations


• Collaborate with Engineering teams to translate recurring customer integration challenges into platform and process improvements


• Create and maintain clear technical documentation, runbooks, and integration guides for customer-facing infrastructure

Required Qualifications

5+ years of experience in System Administration, DevOps, VoIP/telephony engineering, or related infrastructure roles

Bachelor's degree preferred in Computer Science, Information Technology, or related discipline, or equivalent practical experience

Hands-on experience with SIP-based integrations, SIP trunking, call routing concepts, and real-world troubleshooting across networks and enterprise environments

Strong Linux administration skills (Ubuntu/Debian/CentOS), including shell scripting (Bash) and scripting in Python or similar

Hands-on experience with public cloud platforms (Azure and/or AWS), including compute, networking, storage, and identity services

Practical experience with containerization (Docker) and orchestration (Kubernetes)

Experience with monitoring, logging, and alerting tools and a structured approach to incident management

Solid understanding of networking fundamentals (TCP/IP, DNS, VPN, firewalls, load balancing, NAT) and security best practices

Strong troubleshooting and problem-solving skills with a proactive, ownership-driven mindset and direct customer impact

Strong organizational skills, managing multiple priorities independently in a fast-paced, customer-facing environment

Professional proficiency in Czech and English required

About CallMiner

CallMiner is the global leader in AI-powered conversation intelligence and customer experience (CX) automation. Our industry-recognized platform captures and analyzes 100% of omnichannel customer interactions delivering the insights organizations need to improve CX, enhance agent performance, and drive automation at scale. By combining advanced AI, industry-leading analytics, and real-time conversation intelligence, we help enterprises transform customer interactions into meaningful connections.