This repository implements a Kubernetes Operator for managing MongoDB Atlas resources. It provides Custom Resource Definitions (CRDs) and controllers that reconcile user-defined specifications (projects, clusters, database users, network peering, backup schedules, private endpoints, search indexes, stream instances, federated authentication, etc.) against the MongoDB Atlas API. The operator supports both API key and OAuth (service account) authentication, multiple deployment modes (cluster-wide, namespaced, OpenShift), and features like dry-run validation, deletion protection, and independent sync periods for cross-project resources. Architecturally, the operator follows the standard kubebuilder/controller-runtime pattern with a manager that registers multiple reconcilers. It has a hand-written core for legacy CRDs (e.g., AtlasProject, AtlasDeployment) and a generated state-machine-based controller layer for newer CRDs (Group, Cluster, FlexCluster, DatabaseUser, IPAccessListEntry) using the crd2go/constate library. A translation layer converts between CRD specs and Atlas SDK DTOs, and indexers enable cross-resource watch triggers. Extensive unit, integration, and end-to-end tests (Ginkgo/Gomega) validate behavior against real Atlas environments. The codebase is professional-grade with clear separation of concerns, reusable utility packages (comparison, time, pointer, HTTP diff client, JSON slice merge for version compatibility), and mature CI/CD pipelines including Helm charts, OLM bundles, SBOM generation, and Red Hat certification scripts. While it is tightly coupled to MongoDB Atlas and not directly reusable as a library, the operator patterns—especially the dry-run transport, state-machine delegation, and version-compatible JSON merging—demonstrate non-obvious engineering skill applicable to other Kubernetes operators.