I Hate F*ing Pre Requisites -The Birthday Cake ERP Recipe Pregame Cont.

I’m staring at the command line. I’m an Infrastructure principal consultant, the “expert” with 18 years of scars from infrastructure battles and cloud architecture wars. But right now, sitting at my desk, I just want to dive into this install, with no plan, no vision – just executing commands willy nilly – I just want to push the buttons.
I hate reading prerequisites. I hate the “before you begin” sections. I am impatient and dangerously curious, and my natural state is dive into whatever I’m doing just to see what breaks, confident that I can put anything back together again later. It’s the same part of my brain that packs too much stuff for a trip or loses track of things while I’m in transit—I just want to get moving.
I have started building my demonstration ERP solution/integration project (Birthday Cake Solution). In my head, I’ve already built it. But on my screen, there is a list of documentation that I must get through first. My solution is a mix of SaaS platforms and heavy Google Cloud layers.
I’ve earned a PHD at The School of Hard Knocks and a I have an MBA from Real Life University. I’ve learned—usually the hard way—that reading the prerequisites is the technical equivalent of checking your bag before you get off the train. If you don’t do it, you leave something vital behind. You find out your OS is too old, or your firewall is blocking the one port you need.
So, I am forcing myself to sit on my hands. I am reading about SaaS constraints and Google Workspace integrations.
But I still really, really want to push the buttons. List of reading below…. ugh….

1 Evolve https://www.evolvehcm.com/
2 Metrc https://www.metrc.com/
3 Flowhub Maui https://www.flowhub.com/product/pos
4 Google Cloud Interconnect & VPN https://docs.cloud.google.com/network-connectivity/docs/interconnect/concepts/overview
5 API Gateway https://docs.cloud.google.com/api-gateway/docs
6 Google Workspace https://workspace.google.com/
7 Google Sites https://google.sitestemplate.net/
8 Odoo https://www.odoo.com/

NotebookLM Day!! The Birth of The Birthday Cake Cloud ERP Solution!

1/23/2026 – Before Fern Arrives

To continue learning about all things Google, I decided to build a couple of NotebookLMs to help me do things like create business plans, or, in this case, create the technical documentation for The Birthday Cake Cloud ERP Solution. 

If you think reading technical prerequisites is boring, creating documentation is excruciatingly boring.  With the help of a GCP NotebookLM, drafting technical documentation has become faster and easier to complete.

Step 1: Compile a list of impactful source documents. Luckily, I have leveraged the list of source documents in my last piece called “F’ing Prerequisites”, see below. Additionally, I have added the technical specs documents that I created that diagrams and explains my proposed solution.

No	System Name	URL
1	Evolve	https://www.evolvehcm.com/
2	Metrc	https://www.metrc.com/
3	Flowhub Maui	https://www.flowhub.com/product/pos
4	Google Cloud Interconnect & VPN	https://docs.cloud.google.com/network-connectivity/docs/interconnect/concepts/overview
5	API Gateway	https://docs.cloud.google.com/api-gateway/docs
6	Google Workspace	https://workspace.google.com/
7	Google Sites	https://google.sitestemplate.net/
8	Odoo	https://www.odoo.com/

Step 2: Start asking questions! I want to gain insights into my solution as well as hit the easy button in drafting the documentation. I’ve included some of the unedited responses below – so far so good!
“Birthday Cake Cloud ERP Solution on GPC Notebook – 13 sources
These sources detail the Birthday Cake ERP Solution, a technical blueprint created by Jen Ryan for a modern cannabis dispensary. The infrastructure utilizes Google Cloud Platform as a foundational layer, integrating specialized software like Flowhub Maui for retail sales and Evolve HCM for human resources and payroll. Compliance is managed through Metrc, a regulatory track-and-trace system essential for the cannabis industry. Supporting these core applications are enterprise tools such as Odoo for financial reporting and Google Workspace for daily business operations. Technical documentation from Google Cloud further explains how API Gateways and Cloud Interconnect provide the secure networking required for this ecosystem. Collectively, the materials emphasize the importance of following technical prerequisites and documentation to ensure these complex, multi-layered SaaS integrations function reliably.
How does the Birthday Cake Solution integrate various SaaS platforms on Google Cloud?
The Birthday Cake Solution is a conceptual architectural framework designed for adult-use recreational dispensaries, where Google Cloud Platform (GCP) acts as the foundational “cake” layer. This base infrastructure hosts and integrates various “topping” applications—specifically best-in-class SaaS vendors—to create a unified technical ecosystem.
This architecture integrates these platforms through a combination of network connectivity, API management, and centralized data repositories on GCP.
The “Base Cake”: Infrastructure and Integration Layers
The core of this solution relies on GCP tenancy to act as the “Home Base” and data repository for the organization. The specific mechanisms used to integrate the disparate SaaS platforms include:

• Google Cloud Interconnect & VPN: These tools are described as the “critical IPaaS pipe connecting everything”. They provide the necessary connectivity to link the GCP “Home Base” with external SaaS platforms (like Flowhub on AWS) and other cloud layers. Cloud Interconnect offers low-latency, high-availability connections to transfer data reliably between networks.
• API Gateway: This component serves as the integration and business layer. It allows the organization to provide secure access to backend services through a well-defined REST API, ensuring consistency across all services regardless of their implementation.
• Cloud DNS: Utilized within the architecture to manage domain naming and network direction for the connected services.
  The “Toppings”: Integrated SaaS Platforms
  The solution treats specific business functions as modular “toppings” that can be selected based on what is “best in season”. These platforms integrate into the GCP base:
• Point of Sale (Flowhub Maui): An enterprise POS architecture hosted on AWS. It integrates with the ecosystem to handle retail operations and connects to state traceability systems. The architecture allows Flowhub to connect to regulatory systems directly or through the broader integration layer.
• Regulatory Compliance (Metrc): Acting as the “regulatory backbone”, Metrc is a track-and-trace system required for compliance. In this solution, Metrc integration can occur through the POS (Flowhub) or directly into the ecosystem to ensure valid tax revenue accounting and chain of custody.
• ERP and Finance (Odoo): Described as the “beast of Finance/Budgeting/Reporting”, Odoo functions as the SaaS ERP vendor. In the Birthday Cake diagram, Odoo is visually positioned within the GCP tenancy layer, handling open-source business apps like accounting, inventory, and CRM.
• Human Capital Management (Evolve HCM): This SaaS platform handles the “people” side of the data, including payroll, HR, scheduling, and timekeeping specific to the cannabis industry. It integrates as an external SaaS cloud connecting to the GCP central hub.
  Operational “Icing”: Business Operations
  To round out the integration, the solution utilizes Google-native tools for daily operations and internal communication:
• Google Workspace: Provides the suite for business operations (Gmail, Docs, Drive).
• Google Sites: Functions as the company Intranet, serving as a central hub for internal documentation and communication.
  This “Birthday Cake” approach allows a dispensary to avoid a monolithic legacy system, instead leveraging GCP to integrate flexible, subscription-based SaaS applications into a cohesive, secure data environment.”

Step 3: Take out a bunch of words in the responses, refine the responses, request additional responses, etc. The NotebookLM creates smart prompts as well that helps me dig through the sources to draft the documentation of the proposed solution. Draft the Birthday Cake Build roadmap, task lists, quality checks, etc. so that we can FINALLY begin our first build! Not sure if I will create an official “project plan”, but a roadmap is a great start! Some more unedited content below – will publish the roadmap when it’s completed!

“What are the benefits of using Google Cloud Interconnect for SaaS?
In the context of the “Birthday Cake Solution” and general Google Cloud architecture, Google Cloud Interconnect serves as the critical infrastructure layer—often described as the “critical IPaaS pipe”—that connects the central Google Cloud Platform (GCP) tenancy to external SaaS platforms and other networks.
The specific benefits of using Cloud Interconnect for integrating SaaS applications include:

1. Reliable, Low-Latency Connectivity
   Cloud Interconnect provides high-availability connections that allow for the reliable transfer of data between your networks. By utilizing a dedicated connection or a service provider, traffic does not traverse the public internet. This results in:

• Fewer points of failure: Bypassing the public internet means traffic takes fewer hops, reducing the risk of disruption or dropped packets.
• Consistent Performance: It offers low-latency performance essential for real-time data synchronization between the GCP “Home Base” and external SaaS “toppings” like Flowhub (hosted on AWS) or Evolve HCM.

1. Cross-Cloud Integration
   For SaaS platforms hosted on other public clouds—such as Flowhub, which operates on AWS—Google offers Cross-Cloud Interconnect. This feature provides connectivity between VPC networks and other cloud service providers through a direct physical connection. This is particularly valuable for the “Birthday Cake” architecture, where the central data repository sits on GCP but must ingest data from “best-in-class” vendors hosted elsewhere.
2. Enhanced Security and Private Access
   Cloud Interconnect allows for more secure architecture by enabling private communication between networks:

• Internal IP Access: Internal IP addresses in the Virtual Private Cloud (VPC) network are directly accessible from connected networks, eliminating the need for NAT devices or VPN tunnels to reach internal resources.
• Private Google Access: On-premises or connected hosts can use internal IP addresses to reach Google APIs and services, further securing the integration layer.
• Encryption Options: While traffic is not encrypted by default, organizations can deploy HA VPN over Cloud Interconnect to apply IPsec encryption to traffic, meeting strict regulatory or security requirements often found in industries like cannabis compliance.

1. Cost Optimization
   Using Cloud Interconnect can help optimize egress traffic costs from the VPC network compared to using standard internet connections or Cloud VPN alone. This is critical for an ERP solution that aggregates large volumes of financial, retail, and inventory data from various SaaS sources into a central repository.
2. Scalability
   As the business grows (e.g., adding more dispensary locations or delivery services), the connection capacity can be scaled to meet specific requirements, ranging from 50 Mbps attachments up to multiple 100 Gbps connections. This ensures the “pipe” connecting the SaaS ecosystem remains robust as data volume increases.
   Why is a disciplined approach to technical prerequisites vital for modern cloud architecture?
   Based on the sources provided, particularly the insights from the “Confessions of an Impatient Consultant” and the technical documentation for Google Cloud and various SaaS platforms, a disciplined approach to technical prerequisites is vital for the following reasons:
3. Prevention of “Dependency Hell” and Operational Nightmares
   Modern cloud architecture involves complex integrations rather than standalone installations. Skipping the “boring stuff”—such as reading the manual—is described as the fastest way to turn a “2-hour install into a 2-day nightmare”.

• Version Compatibility: A disciplined review ensures that operating systems and libraries are neither too old nor too new, preventing the environment from “bricking” before work begins.
• Time Efficiency: The “Impatient Consultant” notes that ten minutes of reading prerequisites on a Friday can save six hours of debugging on a Saturday, preventing the chaotic process of fixing a broken system that was deployed without a plan.

1. Ensuring Network Viability and Connectivity
   In a “Birthday Cake” architecture—where a Google Cloud (GCP) tenancy acts as the base connecting external SaaS “toppings” like Flowhub (on AWS) and Evolve HCM—connectivity is the critical “pipe”. Ignoring networking prerequisites can lead to fundamental failures:

• IP Address Conflicts: When connecting networks via Cloud Interconnect, a disciplined approach is required to ensure on-premises and VPC IP address spaces do not overlap. If they do, traffic cannot be routed properly.
• MTU Mismatches: Network engineers must verify Maximum Transmission Unit (MTU) sizes beforehand. For example, while some cross-site networks support 9,000 bytes, specific VLAN attachments might only support 1,440 or 1,500 bytes. Mismatches can cause packet loss and performance degradation.
• Firewall Configuration: A disciplined architect identifies which firewall ports must be open before starting the installation, rather than discovering them while troubleshooting connection timeouts during deployment.

1. Establishing Security and Compliance “Perimeters”
   Security in cloud architecture is not a default state; it requires proactive configuration.

• Regulatory Backbones: For industries like cannabis, integrating with compliance systems like Metrc is non-negotiable. You cannot “wing it” with regulatory software; the prerequisites regarding valid tax revenue accounting and chain of custody must be understood to ensure the architecture supports legal mandates.
• Identity and Access Management (IAM): Before configuring components like an API Gateway or Cloud Interconnect, specific APIs (such as the Network Connectivity API) must be enabled, and correct permissions (like roles/compute.networkAdmin) must be assigned. attempting these tasks without these prerequisites results in immediate failure.
• Encryption: Traffic over Cloud Interconnect is not encrypted by default. A disciplined approach identifies the need for MACsec or HA VPN over Cloud Interconnect to meet security standards before data begins flowing.

1. Integrating Disparate “Toppings”
   The “Birthday Cake Solution” relies on the seamless integration of best-in-class SaaS vendors (the toppings) with the GCP Foundation (the cake).

• Cross-Cloud Constraints: Because platforms like Flowhub Maui run on AWS, the architect must understand the prerequisites for Cross-Cloud Interconnect to link the GCP “Home Base” with the POS system.
• SaaS Specifics: Each vendor has unique constraints. For instance, Evolve HCM handles payroll and HR, while Odoo manages finance. Understanding the specific API limitations and data structures of these “beasts” prevents data silos and ensures the “integration layer” functions correctly.
  In summary, while the natural impulse may be to “push the buttons” and “break it just to see how it puts itself back together,” a disciplined approach to prerequisites is the only way to secure the perimeter, ensure valid connectivity, and avoid costly remediation.”