ai-enabled-hr-talent-automation

Deployment Architecture

Title: Deployment Architecture Version: 1.0 Owner: [TENANT_CONFIGURATION_REQUIRED — Platform/DevOps] Status: Draft Last reviewed: 2026-09-07 Next review: [TENANT_CONFIGURATION_REQUIRED] Reviewers: Architecture, Security, DevOps

Purpose and scope

Describes the default runtime deployment topology: containerized services on Kubernetes, cloud-provider-agnostic, with environment promotion dev → test → staging → prod. See environment-strategy.md for environment-specific config and ci-cd-quality-gates.md for promotion gates.

Deployment diagram

flowchart TB
    subgraph Edge
        CDN[CDN / Static Hosting - Web App]
        WAF[WAF / API Gateway]
    end

    subgraph Cluster [Kubernetes Cluster - per environment]
        subgraph NsCore [Namespace: hr-core]
            API[HR Core API pods]
            WF[Workflow Engine pods]
            DOC[Document Service pods]
        end
        subgraph NsAgent [Namespace: agent-plane]
            ORCH[Agent Orchestrator pods]
            RAGSVC[RAG Retrieval pods]
        end
        subgraph NsInt [Namespace: integration]
            INT[Integration Adapter pods]
            MCP[MCP Server pods - one per external system]
        end
        subgraph NsPlatform [Namespace: platform]
            NOTIF[Notification Service]
            AUDIT[Audit Service]
            REPORT[Reporting Service]
        end
    end

    subgraph ManagedData [Managed Data Services]
        RDBMS[(Managed Relational DB)]
        REDIS[(Managed Redis)]
        BLOB[(Object Storage)]
        VEC[(Vector Store)]
        BUS[[Managed Message Bus]]
    end

    subgraph ExternalSaaS [External SaaS]
        IDP[Identity Provider]
        CAL[Calendar/Email]
        ESIGN[E-signature]
        HRMS[HRMS/Payroll]
    end

    CDN --> WAF --> API
    WAF --> IDP
    API --> RDBMS
    WF --> RDBMS
    DOC --> BLOB
    ORCH --> REDIS
    RAGSVC --> VEC
    INT --> BUS
    MCP --> CAL
    MCP --> ESIGN
    MCP --> HRMS

Environment topology

Environment	Purpose	Data	Scale
dev	Developer integration	Synthetic/fake only	Minimal, single replica
test	Automated test execution (CI)	Synthetic, reset per run	Ephemeral
staging	Pre-prod validation, UAT	De-identified or synthetic	Prod-like, reduced scale
prod	Live tenant traffic	Real (protected per data-classification-and-retention.md)	Full, autoscaled

Deployment principles

Immutable container images, promoted (not rebuilt) between environments.
Each MCP server deployed as an isolated workload with its own credentials and network policy (see ADR-004).
Blue/green or canary rollout for the HR Core API and Workflow Engine; feature flags gate new workflow stages.
Secrets injected at runtime from a vault — never baked into images (see secrets-and-key-management.md).
Network policy: default-deny between namespaces; explicit allow rules per integration.

RTO/RPO targets (configurable defaults — [TENANT_CONFIGURATION_REQUIRED])

Tier	RTO	RPO
HR Core API / Workflow Engine / RDBMS	4 hours	15 minutes
Document Service / Object Storage	8 hours	1 hour
Vector Store (rebuildable from source docs)	24 hours	N/A (derived data)
Reporting/Analytics	24 hours	24 hours

See resilience-and-disaster-recovery.md for full DR strategy.

Infrastructure as Code

Default: Terraform (alternatives: Bicep, Pulumi — see technology-selection-matrix.md). All environments provisioned from the same IaC modules with environment-specific variable files; no manual console changes to prod.

Assumptions and dependencies

Cloud provider is [TENANT_CONFIGURATION_REQUIRED]. Kubernetes distribution (managed AKS/EKS/GKE vs. self-managed) is [TENANT_CONFIGURATION_REQUIRED].

Risks and open questions

Multi-region active/active vs. active/passive — pending business continuity requirements [LEGAL_REVIEW_REQUIRED] for data residency.

Change control

Version	Date	Author	Change
1.0	2026-09-07	Documentation package generation	Initial creation

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