Build vs. Buy: The cost and benefit of vibe coding your Enterprise SPM
The pitch writes itself. You’re a leader with a portfolio management problem. You open an AI coding tool, describe what you need, and within a day you have something that looks like a working Strategic Portfolio Management system.
This is the alluring promise of vibe coding enterprise tooling. AI code generation has gotten good enough that non-developers can build surprisingly capable internal tools in hours. So why would you buy a purpose-built SPM platform instead?
The honest truth is that sometimes building is the way to go. But many teams come to realize that the path is deceptively expensive, with the gap only widening as your portfolio’s complexity grows.
The real case for building
Let’s consider the pro-build argument objectively and seriously. It deserves as much.
When you build, you get exactly what you ask for. Your organization has specific processes it can translate into a custom solution. Things like unique stage gates, a financial governance structure that does not map to any vendor’s template, and a prioritization framework developed over years come to mind. A custom tool can mirror that logic precisely without compromise.
And cost, at least initially, looks attractive. A few weeks of engineer time or AI-assisted development can produce something functional at a fraction of a platform’s annual contract value. If your portfolio management needs are genuinely narrow and stable (say, a single team tracking a small set of projects), building might actually be the right call.
Where the build path quietly falls apart
The problems are rarely visible at the start. They compound.
Maintenance is the invisible tax. That working prototype you built in a sprint becomes a dependency. When your governance process changes, someone must update the data model. When leadership asks for a new portfolio view, someone must build it. When an integration breaks after a third-party API update, someone must fix it. That someone is usually you, or a developer you’re borrowing from another team. Vibe coded tools don’t come with roadmaps or support contracts, only technical debt.
You built a reporting tool, not a strategy system. Most homegrown SPM solutions nail the tracking layer, which is closer to what traditional PPM platforms do anyway. What they can’t easily replicate is where the true value is added:
- Scoring and comparing initiatives
- Modeling resource trade-offs across the full portfolio,
- Detecting early signals that a project is becoming disconnected from strategic goals
- Testing alternate futures (scenario planning) before a board meeting.
These aren’t features, but capabilities that take years to build.
Human resistance. Enterprise tools live and die by how many people actually use them. A custom build with no training materials or no onboarding flow lands as a spreadsheet with extra steps. You end up with fragmented usage, which in turn means you never get a reliable snapshot of your portfolio.
The governance gap. When auditors, regulators, or senior leadership ask for audit trails, approval workflows, and traceable decision records, a homegrown tool will struggle. These are foundational elements of an SPM platform, and retrofitting them is painful.
What a purpose-built platform changes
A platform like Keto is built specifically for the problems that emerge at enterprise portfolio scale. These problems don’t show up until you’re managing multiple portfolio types, trying to allocate resources optimally, and trying to connect executive strategy to ground-level execution.
The structural difference matters most. Keto runs on a single unified data model, which means that OKRs, initiatives, financial plans, capacity, and risk are inherently connected. When a strategic initiative gets deprioritized, the resource implications are immediately visible. When capital gets reallocated, the portfolio updates in real time.
Speed to value also flips the conventional assumption. Enterprise software implementations often last 12–18 months before you ever see a working system. Keto is designed to be live in weeks, with no-code configuration that lets teams adapt the platform to their specific governance model.
Then there’s the intelligence layer. Keto AI+ doesn’t just track what’s happening in your portfolio; it detects patterns before they become problems. When leadership asks, “what if we pulled funding from initiative X and shifted it to Y,” you want an answer in minutes, not a week of analyst work.
The real decision criteria
Build if your portfolio management needs are narrow, stable, and likely to stay that way. If you’re tracking a handful of initiatives in a single team with minimal governance requirements and no plans to scale, a lightweight custom tool can work fine.
The vibe coding path has a level of functionality you can reach quickly and cheaply. What it doesn’t have is a ceiling it can grow into. At enterprise scale, the question isn’t whether you can build something that works today. It’s whether what you build can keep pace with the complexity of what you’re trying to manage.
Strategic portfolio management is ultimately about making better decisions with limited capital and constrained capacity. This requires a system designed for exactly that purpose.
Explore what purpose-built Strategic Portfolio Management looks like in practice.