IVAN MALIANOV

Work on reliability, observability, releases, technical acceptance, and L3 diagnostics for a CDC/data middleware platform used in a large BSS transformation.

• Supported production stabilization across OpenShift, Kafka/CDC, PostgreSQL, ScyllaDB, integration jobs, orchestration flows, and network interactions.
• Investigated memory and disk exhaustion, network unavailability, configuration defects, post-restart failures, connection exhaustion, OOM events, prepared statement errors, and data pipeline failures.
• Reviewed architecture diagrams, operational documentation, troubleshooting procedures, change plans, recovery steps, and UAT results before production rollout.
• Built and migrated monitoring for infrastructure, databases, containers, connectors, certificates, disks, and scheduled jobs using VictoriaMetrics, Prometheus, Grafana, Alertmanager, and Netcool.
• Validated backup/restore and resilience scenarios for PostgreSQL and ScyllaDB, including failover, switchover, snapshot-based recovery, incremental restore, and full node recovery.
• Implemented highly available PostgreSQL connectivity using Patroni, etcd, and HAProxy, then verified related data pipeline behavior after the change.
• Rebalanced OpenShift workload resources, reducing recurring OOM/restart issues and correcting overprovisioned requests/limits.
• Hardened platform access by helping remove shared and obsolete accounts, identifying exposed secrets, moving technical users to SSH keys, and coordinating access changes with information security.
• Automated operational checks, configuration corrections, storage cleanup, deployment log collection, and parts of the CI/CD support flow using Python, Bash, Jenkins, and GitLab CI/CD.
• Localized vendor defects, prepared technical evidence, requested RCA where fixes addressed only symptoms, and coordinated DBA, DevOps, network, security, development, and vendor teams until service recovery was confirmed.

• Developed DevOps practices for a large agricultural holding: GitLab CI/CD, Docker/Docker Compose deployments, quality gates, automated tests, security scans, monitoring, and operational automation.
• Migrated critical on-premises infrastructure, including Kafka, PostgreSQL, GitLab, and Vault, to Yandex Cloud using Hystax, with no data loss recorded in the source CV.
• Containerized Pentaho Community Edition, simplified dependency management, and supported further updates.
• Installed and supported GitLab CI/CD, Ansible, HashiCorp Vault, Prometheus, Grafana, and data processing tools.
• Automated deployment, backups, code quality checks, key management, reverse proxy configuration, and incident support routines.

• Developed a Python web service for second-line support of Hadoop environments, including configuration collection, service status checks, analytics, reports, Grafana data, and automated support actions.
• Built and integrated Python modules for Ambari and Ranger APIs.
• Participated in architecture design, legacy refactoring, MVP-to-production delivery, and internal product presentations.
• Developed cluster health metrics and monitoring; source CV records reduced manual L2 support effort and incident volume after rollout.
• Mentored and coordinated two interns who completed the program and received team offers.

• Developed backend services and automation with Python, Django, PostgreSQL, Celery, RabbitMQ, C++, OpenCV, and Boost.
• Built software for media processing and a stereo-vision system.
• Administered and developed Salesforce applications using APEX, jQuery, and Lightning Apps.
• Managed technical support processes, maintained digital interactive installations, and tested new functionality before rollout.