Application modernization services at Redlio Labs start with a verdict on every legacy system the business cannot switch off. We price each alternative, including leaving a system alone, before we quote. The assessment gives your business case the priced alternatives a finance review asks for, and it is yours to keep.
Reviewed by Mayursinh Jadeja, Founder · Last updated October 13, 2026
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“Redlio Labs successfully delivered the project within schedule; they met all of our requirements. Their quality designs and in-depth knowledge of technology were key elements of their work.”
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We modernize a legacy estate one system at a time. The system that has run a business for a decade is several things under one name. It has a core that still does its job, integrations added under pressure, a reporting layer built in a hurry and business logic that exists only in the code.
Legacy system modernization goes wrong when all of it is called legacy and treated as one object. The parts are in different condition, and one approach applied to everything rewrites a module nobody has changed since 2019. The integration that fails every month end stays where it was. We do not arrive with rehost, refactor or rebuild already chosen.
Application modernization is the work of bringing an existing system up to a platform, architecture and interface your business can keep using, without rebuilding the parts that do not need it. So before we quote, we go through your estate system by system and reach a verdict on each one.
Each system is rebuilt, moved as it is, wrapped, left alone or switched off. Then we price the verdicts. The order matters, because the expensive mistake in modernization is rarely the wrong technology. It is rebuilding something that was working.
We scope every piece of work below from a verdict. Most programs use several across one estate, and we take the mix from the assessment instead of choosing it in advance. We also advise comparing legacy modernization services that way: by which parts of your estate each proposal intends to rebuild.
“Redlio Labs successfully delivered the project within schedule; they met all of our requirements. Their quality designs and in-depth knowledge of technology were key elements of their work.”
Verified review on Clutch1 / 4
We hold a 30 minute scoping call before anyone writes a proposal. We ask what your estate runs and what is forcing the timing. Then we give a straight answer on fit: a rebuild, a smaller piece of work, or not our work at all.
Mayursinh JadejaFounder
These are the alternatives a business case has to price. The industry publishes them as a menu of techniques that each start with the letter R: rehost, replatform, refactor, rearchitect, rebuild, retain and retire. A reviewer will ask which were considered and why each was rejected, so we give every verdict its condition and its cost.
| What it means | Right when | What it costs you | |
|---|---|---|---|
| Rebuild | The system is redesigned and rewritten on a current platform, in stages, while the old one keeps running. Called rebuilding, or rearchitecting where the structure changes as well as the code. The common case is a monolith, one application deployed as a single unit, split into separately deployable services, sometimes called microservices | The logic needs to change, not just the platform, and the system is central enough to justify the discovery work | The longest program and the widest testing surface. It also includes a discovery project where the logic was never documented |
| Move it as it is | The system is migrated to current infrastructure with the code substantially unchanged. Called rehosting, or lift and shift, when nothing changes but the hosting, and replatforming when the runtime or database underneath it changes too | The platform is the risk, not the software. Hardware, an operating system or a hosting contract is ending | Buys time, not improvement. The same decision returns in a few years, and the business has paid to defer it |
| Wrap it | The core stays where it is and a current interface and API layer are built in front of it. Called encapsulation, and it is the one option that leaves the original code untouched while still changing what can reach it | Other systems need to reach this one and the core itself is stable and understood | The seam becomes a permanent thing to own. A wrap also does not reach every surface, and where it stops matters more than the wrap itself |
| Leave it alone | Nothing is done, deliberately, and the decision gets a review date. Called retaining, and it belongs in the business case as a priced alternative | The system is stable, unchanged, understood by more than one person, and the pain is somewhere else | Nothing today. The risk is that “leave it alone” was a decision nobody wrote down, so it becomes a surprise later |
| Switch it off | The system is retired, its data is preserved, and the work it did moves or stops. Called retiring, or replacing where a product takes over the work | The system serves a process the business no longer runs, or a handful of users with an alternative | Data retention and the audit conversation. Usually the smallest piece of work and the one nobody proposes |
Two of those five verdicts mean we build nothing. We advise reading any assessment that returns five rebuilds from five systems as a quote, ours included.
We do two of the five. We rebuild systems, and we build the interface layer that lets current software reach an older core. We deliver rebuilds in Next.js, React, Node, PostgreSQL and MongoDB, whatever the system is written in today.
Moving a system onto new infrastructure with its code unchanged is not our work. Where that is the right verdict we will say so, and an infrastructure partner should do it. Paying us to rebuild something that only needed a new host would be the more expensive mistake by a wide margin.
That raises an obvious point, so we will raise it ourselves. We are paid to rebuild things. An assessment written by us has a direction it would prefer to go in, and we want it read knowing that.
It is exactly why we publish the questions below and the business case anatomy further down in full, instead of keeping them as method. We expect them to be asked of our plan as well as of your estate.
We ask these about every system in scope. We publish them so they can be asked of your own estate, or of a proposal that is not ours.
The business case
A modernization program is approved by someone who will not use the system, on the strength of a document written by someone who will. We publish what that document has to contain. Seven things separate a business case that survives a finance review from one deferred to next year.
Items one to four come out of the assessment. Five, six and seven are decisions your business owns, and we would rather they stay that way, because a case argued in your words holds up in a room we are not in.
We do not publish figures, because a figure without your estate behind it is a number designed to win a search result. We show exactly which parts of an estate move the price, so any quote, from anyone, can be read for what is missing from it:
We treat the price in any proposal that cannot answer these five as provisional, whatever it says on the cover.
The two that blow budgets: undocumented business logic, and the length of the side-by-side window. Both are knowable before a contract is signed, and we scope both before we quote.
The numbers we left out
Item seven of the list above says a case should state what it does not claim. Here is ours, on the page, because it is the same discipline. These numbers appear on nearly every other page that ranks for this search.
The most common one holds that ninety percent of businesses are held back by legacy technology. We traced it. It comes from a survey of one hundred IT decision-makers, run in 2015 and commissioned by a firm that sold modernization consulting. The original press release is no longer obtainable anywhere.
Two trade publications reported that same survey in the same week and disagreed about what it measured: one said legacy systems, the other said reporting and analytics tools specifically. The word businesses entered through a headline; the body of the article said IT decision-makers, which is not the same claim.
The same survey found that only about a third of those people said legacy systems affected most of their projects. That is the number the statistic quietly leaves out.
The one figure in this area we found properly sourced comes from the US Government Accountability Office. It reports that federal agencies spend roughly eighty percent of their IT budget operating and maintaining existing systems.
It is real, it is auditable, and it is about US federal agencies, so it is not evidence about your business. That distinction is the reason we will not put it in your business case either.
We would rather hand you a case with your own numbers in it and nothing borrowed. It is harder to write and much harder to argue with.
The one source that survived the trace: US GAO, Information Technology report GAO-23-106821, 2023
Interfaces designed by our teamSee the case studies
Four situations where we advise against running this program, or against running it yet. Each one has cost somebody a quarter:
Where one of these describes your situation, we would rather hear it on the call. It is a faster conversation than the alternative.
Step 1 of 5
We map your workflows, systems, and constraints with the people who use them every day, before anything is scoped. On modernization: we ask the six questions of every system and reach a verdict on each, in an assessment that is yours to keep either way.
Discovery
Step 2 of 5
We write a scope, a timeline, and a price for that scope. Architecture decisions are made and documented before code starts. On modernization: we write the side-by-side window, the reconciliation approach and the stage at which the first useful thing lands into your plan.
Scope and plan
Step 3 of 5
Senior engineers deliver in planned stages, with working software demonstrated at every step, not a reveal at the end. On modernization: we draw the stages so each one is independently useful, and a program that pauses still holds the stages already delivered.
Build in stages
Step 4 of 5
Data migration, training, and a production cutover planned around your operations and your calendar, not ours. On modernization: we cut over stage by stage instead of in one weekend, and keep both systems live and reconciled until the new one has been right for an agreed period.
Launch
Step 5 of 5
The team that built your system stays on it: monitoring, support, and the next improvements on one roadmap. On modernization: we also retire what was replaced, the step a program most easily leaves unfinished, so the old system is formally closed.
Run and improve
The routes to modernizing legacy code, the strangler fig pattern, and the rules a staged migration needs in writing: what to do when the two systems disagree, when rollback expires, and what a facade never sees.
Mayursinh Jadeja
Is it better, or cheaper, to build or buy? The statistic the debate leans on, traced to its source. Then who publishes the advice, a real project that went custom, the boundary no comparison prices, and what it costs to change your mind.
Mayursinh Jadeja
If something here does not answer it, ask the founder directly.
Talk to the people who do the work
A 30 minute scoping call with the team that would take the project on. We reply within 12 hours.
Prefer email?info@redliolabs.com
Application modernization is the work of bringing an existing system up to a current platform, architecture and interface without rebuilding the parts that do not need it. In practice we choose between five verdicts: rebuilding a system, moving it as it is, wrapping it in a current interface, deliberately leaving it alone, and switching it off.
Most estates need a mix, and deciding that mix is our first piece of work and the core of your application modernization strategy.
We modernize an application when its logic has to change, or when the cost of running it is rising for a reason the business can name. We recommend migrating it as it is when the platform is the risk and the software is not: an operating system going out of support, hardware nobody will service, a hosting arrangement ending.
That move buys time, not improvement, and it is not work we do. When it is the right verdict we say so and point to an infrastructure partner. We recommend leaving a system alone, with a review date, when it has not changed in eighteen months, several people understand it and the pain is somewhere else.
We rebuild your system in Next.js and React at the front, Node behind it, and PostgreSQL or MongoDB underneath, depending on the shape of your data. That holds whatever the current system is written in, including PHP, .NET and VB.
We will not keep you on your current language to make the project easier for us, and we will not move you onto something we do not run ourselves. It is the same stack our embedded engineers work in every day.
We advise calculating ROI on application modernization from the event that forces the timing and the one cost line that is rising, not from an industry percentage. A case that survives a finance review also prices the rejected alternatives, including leaving the system alone, and the cost of running two systems during the migration.
It names the business decision waiting on the program and the stage at which the first useful thing arrives. It also states what it does not claim, because the popular statistics about legacy technology holding companies back do not survive a trace to their source.
We advise choosing a partner for legacy system modernization on what they will commit to in writing, before comparing prices. Five commitments matter. Three concern the migration: the stage at which the first useful thing lands, the expected length of the side-by-side period and who pays for it, and acceptance criteria beyond feature parity.
The other two are the named owner of the boundary between old and new, and what your business holds at the end in code, documentation and data. Any application modernization company can describe its process, so we suggest comparing vendors on those five answers before comparing rates.
We modernize a legacy system with minimal disruption by cutting over in stages and running old and new together with daily reconciliation. We agree in advance which system is believed when the two disagree, which decides whether a migration stays calm. Our article on legacy modernization without downtime sets out the rules we use when the two return different numbers.
We modernize existing healthcare software, legacy fintech and banking systems and legacy manufacturing production systems the same way: in stages, with both systems running until their results agree.
We estimate the length of an application modernization program from two things: how much business logic is documented, and how long both systems run side by side. We establish both during discovery, before any commitment, and write both into the plan as dates, not intentions.
We price application modernization from seven things about your estate, which is why we do not publish figures. Four are how much of the estate is in scope, whether the logic is documented, the length of the side-by-side window and the integration surface.
The other three are the condition of the data, your audit obligations, and the training and handover for the people who run the system today. The two that most often break a budget are undocumented logic and the side-by-side window, and we scope both before we quote.
Thirty minutes with the engineers who would do the work, with an NDA before the first call. We reply within 12 hours and ask which systems are in question and what is forcing the timing. We give a straight answer on fit, even when the verdict is a move to new infrastructure, a smaller fix or leaving the system alone.
Mayursinh Jadeja
Founder, Redlio Labs
