Predrag – Kubernetes, GitLab CI/CD, Docker

The croit platform provides enterprise storage management and support for Ceph-based environments, helping customers install, maintain, upgrade, and migrate production storage clusters. It also supports advanced storage protocols, including NVMe-oF and iSCSI, for reliable storage operations.

• Provided Level 2 support for the croit application and Ceph customers;
• Supported Ceph installation, upgrades, and maintenance;
• Supported migrations to and from the croit platform;
• Served as component lead for NVMe-oF and iSCSI;
• Performed daily cluster reviews and maintenance;
• Helped customers operate reliable production storage environments.

Production Ceph storage environments supporting international customers and petabytes of data. The platform focuses on automated issue detection, cluster analysis, maintenance, upgrades, data integrity, and performance optimization to improve operational reliability.

• Developed procedures and software for automatic issue detection in Ceph environments;
• Enabled first-level support engineers to triage and resolve customer issues;
• Supported production Ceph clusters containing petabytes of data;
• Analyzed clusters for data-integrity risks and performance improvements;
• Supported new cluster installations and migrations;
• Performed continuous Ceph upgrades with zero downtime;
• Extracted unaffected data from corrupted environments;
• Worked directly with international customers.

An open-source documentation-as-automation tool that executes code blocks embedded in Markdown documentation, turning operational procedures and tutorials into executable and testable workflows. It makes technical documentation more repeatable and practical for development and operations teams.

• Created the rundoc open-source project;
• Implemented execution of Bash, Python, and other documented code blocks;
• Supported environment variables, secrets, tags, retries, breakpoints, and saved output;
• Promoted documentation as an automation principle;
• Used the tool to make operational documentation executable and repeatable;
• Presented the approach at Evolution of Technical Communication and Write the Docs.

A web-based testing tool built around the boto library to help developers quickly launch and preconfigure AWS instances for on-demand testing. It reduces manual effort by providing consistent, repeatable test environment setup.

• Built a web interface around the boto library;
• Automated AWS instance creation and preconfiguration;
• Supported on-demand testing workflows;
• Reduced repetitive infrastructure setup for developers;
• Contributed to CI and general process automation;
• Maintained supporting platform services and packages.

Integrated the client's products into complex customer environments containing highly available, load-balanced application and data-processing clusters. Automated deployments, configuration, diagnostics, and data transformation across multiple infrastructure technologies.

• Owned remote and on-site customer deployments;
• Deployed Apache, Java, PostgreSQL, Cassandra, Elasticsearch, HAProxy, and microservice clusters;
• Developed auto-configuration scripts for customer environments;
• Built log parsers for custom reports;
• Developed command-line tools for analytics and log inspection;
• Created tools for data-model transformation and mapping;
• Addressed resource shortages through process improvement;
• Promoted automation and security awareness;
• Protected sensitive customer data.

Designed and implemented an automated test framework for a cloud storage product. The framework provisioned cloud infrastructure, deployed the product, configured networking and storage, and executed tests without requiring test authors to be programmers.

• Built continuous integration and build/deployment automation from the ground up;
• Designed a test framework for non-programmers;
• Launched AWS instances and configured security groups;
• Attached network and disk devices automatically;
• Deployed the product and executed test cases;
• Built tools around AWS, Azure, and VMware;
• Improved software upgrades, packaging, and update delivery;
• Discovered and fixed multiple security vulnerabilities;
• Automated infrastructure-service provisioning;
• Established release management and nightly builds.