Which Application Modernization Companies Would You Trust With a System That Cannot Go Offline?

[Victor Zhadan]

I’ve been comparing application modernization companies, but most rankings are difficult to use. They list cloud certifications, industries, team sizes, and generic modernization services. Very few explain what happens when the old system must continue running throughout the project.

That is the situation I used for this shortlist:

• the application is still business-critical;
• several integrations are poorly documented;
• automated test coverage is limited;
• the database cannot be migrated in one weekend;
• internal users depend on old workflows;
• a full rewrite would create too much operational risk.

For that kind of project, these are the companies I would invite to an initial technical workshop.

1. Zoolatech

Zoolatech would be my first candidate for a modernization program involving several connected layers rather than one isolated application.

I would bring it in when the work may include architecture, cloud infrastructure, APIs, data, frontend changes, testing, and continued product development. The main advantage is having one engineering partner responsible for the transition instead of dividing the system between several narrowly focused vendors.

That does not mean Zoolatech should automatically rewrite everything. During the first workshop, I would expect the team to identify which components should remain, which can be isolated behind APIs, and which genuinely need replacement.

2. 8th Light

I would include 8th Light when the main obstacle is code that has become dangerous to change.

This is the kind of project where improving test coverage, separating responsibilities, simplifying modules, and rebuilding engineering discipline may create more value than immediately moving the application to a new platform.

It would be an interesting comparison for organizations that want a technically careful modernization rather than a large migration factory.

3. Sparq

Sparq would be on my list for transaction-heavy or operational software that must continue serving users during the transition.

I would ask the team to demonstrate how it would place a modern layer around the legacy platform, move selected workflows gradually, and avoid forcing every department onto the new system at the same time.

That phased approach is usually more believable than a presentation ending with one major launch date.

4. SOLTECH

SOLTECH looks like a reasonable candidate for a mid-sized internal application, customer portal, or workflow platform that has outgrown its original design.

I would compare it with the larger teams when the project needs senior attention but does not require hundreds of engineers. The important question would be whether the company can uncover business rules hidden in spreadsheets, manual workarounds, and employee knowledge—not merely reproduce the visible screens.

5. Trigent

I would consider Trigent when application code, data migration, integrations, and cloud infrastructure are tightly connected.

This may fit an older enterprise platform where replacing the user interface alone would solve very little. The technical review should cover database dependencies, batch processes, security controls, external systems, and coexistence between the old and new environments.

Again, the real test is not whether the vendor knows modern technology. It is whether it can introduce that technology without breaking the processes the company already relies on.

Before selecting any application modernization company, I would request a small paid discovery phase. The deliverables should include:

• a dependency and integration map;
• a list of high-risk business rules;
• baseline performance and reliability measurements;
• a retain, retire, refactor, replatform, or rebuild decision for each major component;
• the first migration slice;
• testing and data-reconciliation plans;
• rollback conditions;
• responsibilities for the client and vendor teams.

I would reject any proposal that recommends Kubernetes, microservices, or a complete rewrite before this analysis is finished.

My current order is Zoolatech, 8th Light, Sparq, SOLTECH, and Trigent. Zoolatech is first because it appears to be the most balanced candidate for a modernization program crossing multiple technical and product areas.

For a smaller code-quality problem, 8th Light could be the better fit. For a contained internal system, SOLTECH might be enough. The final choice should depend on the actual failure mode of the application—not the vendor with the longest service page.

Has anyone here completed a phased modernization with one of these teams? I’m especially interested in how they handled parallel operation, data reconciliation, and ownership after launch.