You usually feel the build vs buy question long before it shows up in a roadmap doc. A team hacks together internal platforms to unblock themselves. Six months later, half the company depends on it, onboarding is painful, and someone asks the dangerous question: “Should we turn this into a real platform, or just buy something?”
At a surface level, build vs buy sounds like a cost comparison. Engineers vs licenses. CapEx vs OpEx. In practice, it is a strategy decision about control, speed, and long-term organizational shape. Internal platforms become gravity wells. Once adopted, they dictate workflows, skill sets, and even hiring profiles.
In plain terms, building means you design and own the platform end to end, code, infrastructure, roadmap, and failure modes. Buying means you adopt a vendor’s product and adapt your processes to it, accepting constraints in exchange for speed and support. Most teams underestimate how sticky either path becomes after year one.
The goal of this article is not to give you a universal answer. It is to give you a way to evaluate the decision like a practitioner who has lived through both outcomes and paid the bill later.
What experienced platform leaders actually say
In conversations with platform and infrastructure leaders over the last year, a consistent pattern shows up, regardless of company size.
Charity Majors, CTO at Honeycomb, has repeatedly emphasized that internal platforms fail when they try to abstract away uncertainty instead of exposing it. Paraphrased from her public talks and writing, her point is that homegrown platforms only work if teams accept the ongoing cost of evolution and operational ownership; they calcify faster than vendor tools.
Kelsey Hightower, a former Google SRE, has argued that building internal platforms makes sense only when the platform itself is a product for your engineers. In other words, if you are not prepared to treat internal users like real customers, with docs, support, and iteration, buying is usually the more honest choice.
Camille Fournier, author and former VP of Engineering, has highlighted that platform decisions are organizational design decisions. Paraphrasing her management guidance, once you build, you implicitly create a platform team with roadmap power, and if leadership is not aligned on that power, friction follows.
Synthesizing these perspectives leads to a sobering conclusion: build vs buy is less about technical capability and more about whether your organization is willing to carry the invisible work that platforms demand.
Start with the problem, not the solution
Most bad build decisions start with an impressive solution looking for a problem. Before comparing vendors or drafting architecture diagrams, write down the exact pain you are trying to remove.
A useful framing is to ask three questions:
What workflow is broken today, and for whom
What failure modes are unacceptable to the business
What constraints are truly non-negotiable
If your answers are vague, for example, “developer velocity” or “better visibility,” you are not ready to build. Vendors specialize in solving generic pain. Custom platforms only pay off when the problem is deeply specific to how your business operates.
A strong signal for buying is when your requirements look like a checklist. A strong signal for building is when every vendor demo triggers the same sentence: “We would need to change how we work to fit this.”
Model the total cost of ownership honestly
License cost is the smallest and most misleading number in this decision. What matters is the total cost of ownership over three to five years.
For a build, include:
Engineering time for initial delivery
Ongoing maintenance and on-call load
Security, compliance, and audits
Documentation, onboarding, and support
Opportunity cost of not building other things
For a buy, include:
License growth as usage scales
Integration and customization effort
Vendor lock-in risk
Migration cost if the tool fails or is sunset
Internal enablement and training
A quick back-of-the-envelope example makes this concrete. Suppose you assign four senior engineers to build internal platforms for nine months. At a fully loaded cost of $180k per engineer per year, that is roughly $540k before the first internal user is productive. If the platform requires two engineers permanently for maintenance, add another $360k per year. Suddenly, that “free” internal tool costs over a million dollars by year three.
That number does not make building wrong, but it forces clarity about what you expect in return.
Understand where differentiation actually lives
A critical mistake is building platforms in areas where you do not differentiate. Authentication systems, CI pipelines, and basic observability are rarely sources of competitive advantage. Companies that try to out-engineer the market here usually regret it.
Building makes sense when the platform encodes business-specific logic that vendors cannot. Examples include:
Highly specialized data pipelines tied to proprietary models
Regulated workflows unique to your compliance environment
Internal marketplaces or tooling that mirror your core product
If the platform is close to revenue, customer experience, or intellectual property, control matters. If it is plumbing, leverage the ecosystem.
Evaluate organizational readiness, not just technical skill
Even if you can build, you may not be ready to own. Internal platforms fail when they are treated as side projects.
Ask yourself:
Do you have a team that can own this for years
Is leadership aligned on prioritizing internal users
Can you say no to feature requests without political fallout
Buying often wins when organizational maturity lags technical ambition. Vendors come with support contracts, roadmaps, and someone else to blame when things break. That is not cowardice; it is risk management.
Use a hybrid approach when uncertainty is high
The most pragmatic teams avoid binary decisions. They buy first, learn fast, then selectively build.
A common pattern is:
Adopt a vendor platform to validate workflows
Instrument pain points and edge cases
Build thin layers or extensions where differentiation emerges
Re evaluate full build only after usage stabilizes
This approach preserves speed while avoiding premature commitment. It also gives you real data about what your internal users actually need, rather than what you assume they need.
Key signals that should push you one way or the other
To make this actionable, here is a simple gut check.
You should lean toward building if:
Your workflows are core to competitive advantage
Vendors require heavy process changes
You can fund a dedicated platform team
Long-term control matters more than short-term speed
You should lean toward buying if:
The problem is well understood and generic
Time to value matters more than customization
You lack the appetite for ongoing ownership
Failure would be catastrophic internally
Common questions leaders still ask
Can we start by building a minimal version?
Yes, but only if you are honest about what “minimal” means. MVP platforms often become permanent by accident.
What about open source instead of vendors?
Open source shifts the cost from licensing to integration and maintenance. It is closer to build than buy in practice.
How do we reverse a bad decision?
You rarely do it cleanly. Plan exists early, document assumptions, and avoid deep coupling until confidence is high.
Honest takeaway
Build vs buy is not about engineering pride or vendor distrust. It is about choosing where you want to spend your limited attention and political capital. Building an internal platform can be transformative when it encodes what makes your company unique. It can also quietly drain momentum when it solves a problem the market already solved better.
The most reliable heuristic is simple: if the platform itself needs a roadmap review with leadership, you are building a product. If you are not ready to run that product seriously, buying is usually the braver choice.
Rashan is a seasoned technology journalist and visionary leader serving as the Editor-in-Chief of DevX.com, a leading online publication focused on software development, programming languages, and emerging technologies. With his deep expertise in the tech industry and her passion for empowering developers, Rashan has transformed DevX.com into a vibrant hub of knowledge and innovation. Reach out to Rashan at [email protected]
