Karlo J.

Endava is a global technology services provider delivering digital transformation solutions for large enterprises across finance, telecom, logistics, and retail.

• Designed DevOps workflows and solution architectures for multiple large-scale products deployed on AWS, ensuring resilient, secure, and observable cloud environments.
• Served as the dedicated DevOps partner for the mobile development division, automating full CI pipelines for native iOS and Android applications, from build and test to App Store / Play Store deployment.
• Collaborated with engineering teams to refine release processes, strengthen deployment automation, and introduced DevOps best practices across projects.
• Troubleshot complex infrastructure issues spanning networks, build systems, and Kubernetes runtimes, reducing deployment friction and improving developer productivity.

A leading Croatian university specializing in computer science, engineering, and digital technologies.

• Taught undergraduate networking courses, including Computer Networks, Routing & Switching, and Service Provider Networking.
• Prepared lecture materials, hands-on exercises, and evaluation tasks for in-person and online delivery.
• Guided students through complex networking topologies and troubleshooting exercises.

Deutsche Telekom’s cloud and platform engineering division, responsible for telco-grade infrastructure across Europe.

• Helped build an internal Kubernetes distribution tailored for cloud-native telecom workloads, with a strong focus on reliability, network performance, and security.
• Developed Kubernetes operators to abstract authentication and authorization workflows at scale, simplifying RBAC management for internal teams.
• Engineered Cluster API–based operators to automate cluster lifecycle management, leveraging OpenStack providers and custom CAPI infrastructure implementations.
• Built a Host-Based Networking (HBN) operator integrating FRR, BIRD, iptables, and early research into VPP for accelerated data-plane operations.
• Created operators for system-level runtime configuration (sysctl, hugepages, GRUB), enabling consistent provisioning of bare-metal nodes.
• Worked in a multidisciplinary engineering team building telco-grade cloud platforms with extremely high availability requirements.

Telecom engineering organization delivering infrastructure, orchestration, and cloud-native platforms.

• Installed, configured, and managed Kubernetes clusters on bare metal and OpenStack for both internal teams and national telecom operators within the DTAG group.
• Integrated and customized upstream open-source components into internal platform offerings, defining service-level indicators (SLIs) and reliability objectives (SLOs).
• Guided engineering teams in implementing GitOps workflows using FluxCD and Argo CD, including CI best practices and deployment observability.
• Performed deep security analyses of Kubernetes from OS-level hardening to admission control enforcement, enhancing platform resilience and compliance standards.
• Ensured operational continuity by automating lifecycle tasks and improving cluster upgrade and rollout procedures.

A global technology and consulting company offering enterprise IT infrastructure, cloud, and managed services.

• Managed and troubleshot over 7,500 Linux virtual machines and more than 400 hypervisors, including VMware ESXi and Red Hat Enterprise Virtualization hosts.
• Led daily operations within an ITIL framework, resolving high volumes of incidents, changes, and production issues across complex enterprise environments.
• Created Ansible playbooks and Bash scripts to automate VM provisioning, OS configuration, patching, and operational workflows.
• Coordinated with multiple cross-functional teams (network, hardware, DNS, SAP, Oracle, Microsoft) to deliver integrated solutions for enterprise clients in the automotive sector.
• Performed large-scale virtualization management and infrastructure upgrades, improving system stability and resource utilization.