February 2026 (Month: 2026-02): Focused on improving resilience of the on-prem Helm deployment by introducing a Configurable Retry Policy for CQL Queries. This feature adds configurable retry attempts and delays for CQL operations, reducing the impact of transient failures and improving data access reliability in on-prem environments. The change was implemented in the 2gis/on-premise-helm-charts repository with commit 6ffc581ff167b601891453f7870b3bcbe4896957 (BASIS-761). No major bugs were reported or fixed this month. Overall, this work enhances service reliability, lowers MTTR during transient errors, and demonstrates proficiency in Helm charts, Kubernetes operator patterns, and CQL client configurations.

December 2025 monthly summary for 2gis/on-premise-helm-charts highlighting the delivery of a secret-based TLS configuration for Cassandra connections, security improvements, and deployment flexibility, along with business impact and technical competence demonstrated.

November 2025: Implemented Mutual TLS (mTLS) support for Cassandra connections in the on-premise Helm charts. Added TLS configuration options, host verification, and Kubernetes secret deployment to secure Tiles API communications with Cassandra. This work strengthens data-in-transit security and aligns with security/compliance requirements while enabling seamless deployment in Kubernetes environments.

September 2025: Upgraded the Tiles API to version 4.75.9 across the on-premise Helm charts repository, ensuring deployments reference the latest API. Updated Chart.yaml and values.yaml to pin the new image, delivering consistent environments and reducing upgrade risk. The work aligns with the roadmap and improves deployment reliability across environments.

Month 2025-07: Upgraded Tiles API to v4.75.1 across tiles-api, tiles-api-importer, and tiles-api-proxy; updated appVersion and docker image tags to ensure deployments reflect the latest Tiles API. This eliminates version drift, improves compatibility, and simplifies ongoing maintenance. No major bugs fixed in this period for this repo.

June 2025 monthly summary: Delivered a targeted reliability improvement for on-prem deployments by upgrading the tiles-api image in the on-premise-helm-charts repository to 4.73.5, ensuring migrations are applied during upgrades. This fix closes a migration gap identified as BASIS-358, based on commit 5d5d5bad245a12fdc3ac3e09a4eb11584df7133c. The change reduces upgrade risk, minimizes operator intervention, and stabilizes the database schema across on-prem clusters.

April 2025 monthly summary for 2gis/on-premise-helm-charts: Delivered Tiles API Token-Based Authentication Enhancement with token separation for raster and vector data, updated configuration and documentation, and Docker image version bumps. No major bugs fixed within the provided scope. Business impact: stronger security, granular access control for tiles API, and improved operability/maintainability. Skills demonstrated: security hardening, API design, documentation, and Docker image governance.