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Off-the-Shelf SaaS or Custom Software — What Should Large Enterprises Choose?

Many organisations start with SaaS for speed and low cost — but as they grow, SaaS often becomes the bottleneck holding them back. This article cuts through the noise on when it's time to go Custom.

Off-the-Shelf SaaS or Custom Software — What Should Large Enterprises Choose?

Almost every organisation we speak with opens with the same question: “Can we just use SaaS for now?”

The answer is yes — but you need to know exactly when SaaS will become the problem.

Where SaaS Works Well

SaaS is an excellent fit when a business is still validating its market. The cost is low, deployment is fast, and you don’t need a large engineering team to get started.

Common cases where it works well:

  • Email marketing (Mailchimp, Klaviyo)
  • Early-stage CRM (HubSpot, Pipedrive)
  • General internal tools (Notion, Slack)

Where SaaS Starts to Break Down

Once a business reaches a certain scale, SaaS typically hits three core limitations:

1. Business Logic Too Complex for SaaS to Handle

SaaS is designed to serve the majority. But if your business runs on a workflow or pricing model that differs from the market norm — you’ll find yourself building workarounds constantly.

2. Scale and Performance

SaaS shares resources across all its customers. If you need to support a high volume of concurrent users or process data in real time — most SaaS platforms simply won’t cut it.

3. Data Ownership and Integration

Your data lives on a foreign vendor’s servers. Integration with other systems is limited to whatever API they choose to expose — you’re always working within someone else’s boundaries.

A Framework for the Decision

Ask yourself these three questions:

  1. Is this system a core business differentiator for us?
  2. Do we need full control over data and performance?
  3. Are we hitting the customisation ceiling of our current SaaS?

If you answer “yes” to two or more — it’s time to build Custom.

Real Example: When SaaS Became the Bottleneck

One of our clients was using an enterprise-grade SaaS e-commerce platform costing millions of baht per year. When they needed to build a loyalty programme that integrated their in-store POS, online orders, and CRM simultaneously — the platform couldn’t do it.

We came in and built a custom system designed entirely around their business model. The result: time-to-market for new features improved 3x, and they cut more than half their operational costs from SaaS licensing.

Conclusion

SaaS isn’t the wrong answer — it’s just sometimes the right answer for a specific window of time.

If the system you’re using is becoming a bottleneck for your organisation, that’s the signal it’s time to talk.

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