4BIS InnovationsNLEN

Code review & technical due diligence

You paid for your software once. Don't find out the hard way you'll be paying for it again.

Most business owners only discover something's wrong with their software when it's already expensive: a security gap, a system nobody dares touch anymore, growth the platform can't keep up with.

A code review gives you an independent, plain-language answer before that happens: is your system solid, does it need targeted fixes, or is it quietly heading toward a rebuild?

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Code review & technical due diligence

Trusted by leading companies worldwide

Three questions, answered honestly

We audit the codebase itself and put the findings in a report written for business owners, not just developers.

Scalability

Can the code be extended and changed sustainably, or is every new feature a fight?

Maintainability

Can bugs actually be found and fixed, or does nobody fully understand how it works anymore?

Future-readiness

Can it keep up with what's next for the business, or will it hold you back?

A rebuild is one of the most expensive calls a business owner can make

In money, time, and momentum. Most rebuilds happen because a problem got found too late.

A code review costs a fraction of that, and tells you where you stand while you still have time to act on it.

A rebuild is one of the most expensive calls a business owner can make

When does this help you?

You want to test or sharpen the technical foundation of your solution

You're considering switching to a new development partner

You want to support your in-house dev team with technical improvements

You need technical due diligence before an investment, acquisition, or partnership decision

How we work

01

We draft a review plan

A short intake on the current situation, how the solution came to be, and any concerns you already have. Together we shape a plan matched to your goals for the audit.

02

We carry out the review

Our engineers assess the code in full: the choices made, the documentation available, and the technologies and dependencies in use.

03

We give independent advice

Our findings go into an advisory report that states the risks and where the opportunities lie, walked through on a follow-up call.

Clear insight, in plain language

How well is the code actually put together? Could another team pick it up, or would they get stuck? Is the data stored securely? Were the agreements that were made actually delivered on?

After the review, you'll know exactly how the solution is built. We explain every building block in plain terms, separate what's genuinely necessary from what's a nice-to-have, and lay out our main recommendations in a management summary.

Clear insight, in plain language
ADD-ON

A cost estimate for improvements

An indicative budget for the improvements we recommend, based on open, transparent calculation, so you can set clear priorities. Working with your own developers or another partner? We're glad to support or advise there too.

ADD-ON

Is your solution ready for data-driven decisions?

This add-on lays out what's already being tracked, what's missing, and what it takes to get your solution ready for growth based on facts, not guesswork.

Have your code reviewed by people who build software every day

A tailored proposal, aimed at your next milestone, with no obligation attached.

Yes, I want insight into my code

Why business owners trust 4BIS with this

Independent, no strings attached

We didn't build your system and we're not trying to sell you a rebuild. Our advice follows what we find in the code.

We build software ourselves

Our team works full-stack on production systems every day, so we know a real risk from a style preference.

Written for you, not just your developers

Every report includes a management summary in plain language, so you can decide without a technical background.

"Development, hosting and technical SEO – everything we needed from our technical partner. Recently, 4BIS.nl implemented an online appointment booking module on our website. We’re very satisfied."

Oogzorgcentrum van Rooij

Frequently asked questions

Usually one to two weeks, depending on the scope of the review and the complexity of the solution. During a no-obligation call we'll discuss your solution and give you a first estimate of the timeline.

The work itself is the same: the source code gets tested against quality standards and industry practice. Technical due diligence is usually the term used when it's part of an investment, acquisition, or partnership decision.

Yes. Websites, internal SaaS tools, apps, integrations: anything built on code can be reviewed. We tailor the audit to the platform and stack in question.

That depends on the scope of the review, the complexity and size of the solution, and the number of platforms it runs on. During a no-obligation call we'll follow up with a clear quote for the review.

Let’s fix your software challenges

Work with a technical partner that designs, builds, and maintains scalable custom software that grows with your organization.


Trusted by teams focused on long-term reliability
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