Turn legacy into modern great software.

Stop wasting money in an old pit. DevOn has a 20+ years experience and a proven approach. We can advice, convert and maintain it. From A-Z.

Legacy

Up to 10x faster

With the latest AI tools, converting you legacy system is now easier and faster than ever seen before.

Satisfied users

Your customers and users have an intuitive UX, modern look & feel and can do their work with ease.

Modern technology

Your legacy system is turned in to a state-of-the art architecture, with the highest security and compliance.

Under pressure to convert legacy software?
Without losing features or balooning costs?

Traditional rebuilding legacy software was expensive and dreadful. Now, with a proven approach and with AI, the business case is often very positive.

we convert legacy into modern apps

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Recognize this?

1 Your legacy is holding you back?

2 Your business is losing revenue?
3 Rebuilding feels risky?
4 Or, almost nobody knows the legacy system?

More details around your challenges

And how we solve them

Expensive legacy pit
solved

Your business stakeholders have many requests and deadlines. But the old system is not maintanable anymore or very expensive. You want to stop wasting money on the old techniques. 

Our top-engineers collaborate in a blended teams and take ownership of the conversion.

Totally focused on your business challenges.

Rebuilding or refactoring with a proven approach
Unworried

The existing legacy systems have tons of business logic and users have worked with it for years.

Replacing it is a deligate process. With AI and interviewing users, we can properly understand the business logic and the craft a sophisticated plan to convert it.

In the whole process, our candor culture and ownership mindset is what customers appreciate for many years.

Knowledge of the system
solved

With AI and interviewing your users, we can quickly understand the older system. 

We’ll convert it to modern state-of-the-art techniques, well documented. After that, the system is well known again!

Do you want this?

1 Safe and predictable modernization

2 New features fast and efficient

3 Unlock business potential for the next 10 years
4 Meet compliance, up-time and security expectations

What is our Application Modernization Approach (AMA)

Or Application Modernization Approach (AMA) is a gradual, iterative, and proven approach that focuses on always working software and rejuvenating legacy and value from it in a timely and cost-controlled manner.

A successful migration is only possible with an iterative approach.That continuously learns from what actually works and feedback from users.

How we modernize systems
Not as body-shop, not as vendor.
As partners

With over 20 years of experience, NPS of 95 and supporting all modern clouds and developing languages.

We know how to deliver value fast.

Discovery & Alignment

We dive deep into your legacy system. We analyze the code with AI, interview users. Measure the maturity of the current SDLC. We propose wether to:

  • Rebuild
  • Refactor
  • Lift & Shift
  • 24/7 maintenance 
Architecture & Roadmap

We make a clear goal architecture for the new system. Incl. a roadmap on how to get there.

Convert

In an iterative approach we rebuild or refactor your current legacy system. We automate tests and pipelines. We migrate the data, users and everyting that’s needed. 

4. Great Software. Together

Your users can use the new system for the next 10 years.

Quotes from our customers

Our Modernization Services

If it’s older technique and/or not all features are needed in the new system, rebuilding is often a good approach. 

We analyze the code with AI, interview users and make a plan on how to safely rebuild your legacy system.

If the technique is not so old and there is an iterative way to do the conversion, refactoring or lift & shift will often work.

We analyze the code, assess the current architecture and SDLC process and come with a proposal to refactor your legacy system.

If you want 24/7 support after the modernization, we can supply that too. 

We’ll implement the latest AI enhanced DevOps and make sure your system works stable 24/7. If there is an issue, our top-engineers are ready to solve it.

Why DevOn?

Only top engineers hired

(1 in 20), paid above market, continuously trained

Long-term developer retention

Many work with the same customer for years

NPS of 95

CIO's value our partnership, candor, and openness

Dutch culture

Direct, reliable, and focused on delivery

More details around our modernization services

Rebuild service

For old techniques

Refactor service

For less old techniques

Modernize & Maintain

Get unworried

Frequently asked questions

What is the fastest way to understand the state of our legacy system?

The quickest and most effective step is our 2‑Week Modernization Assessment.

You receive:
  • Architecture analysis
  • Tech‑debt overview
  • Security & quality diagnostics
  • Modernization scenarios (refactor, rebuild, re-platform, strangler pattern, etc.)
  • Clear business case + roadmap
It removes guesswork and provides clarity for your leadership team.

ou’ll receive:

  • A quick context check: tech, teams, architecture
  • Identification of your biggest blockers
  • The best modernization option for your situation
  • A recommended next step (typically the 2‑week assessment)
  • A realistic view of risks, costs, and timelines
It’s not a sales call — it’s a clarity call.

It depends on:

  • The amount of technical debt
  • Business risk tolerance
  • Speed of change required
  • Team maturity
  • Architecture constraints
  • Market pressure
In many cases, the smartest approach is hybrid: stabilize the core, decouple high‑value domains, then rebuild or replace incrementally.
We help you choose the path that minimizes risk and maximizes business impact.
Because we enforce excellence at every step:
  • Only top engineers (1 in 20 hired)
  • Above‑market pay → long‑term retention
  • Strong coding standards & peer reviews
  • Full CI/CD, automation & DevOps practices
  • AI‑assisted engineering
  • Dutch directness: no surprises, clear agreements
  • Stable teams (many stay with the same customer for years)
Better practices = faster, higher‑quality delivery.
 

Yes.

Our teams work across all modern stacks and all cloud platforms:
  • Java, .NET, Python, Node, React, Angular, Kotlin, Go, C++
  • Azure, AWS, GCP
  • Databases, messaging, event-driven, serverless, microservices, APIs
Whether you need to rebuild a core platform or lift‑and‑shift to cloud, we can handle it.

This is a DevOn USP:

  • Developers stay years with customers
  • We pay above market
  • We invest heavily in continuous training
  • We hire for culture, communication, and ownership
  • We offer both Dutch and Indian senior engineers
  • Nearshore + offshore ensures 24h delivery cycles when needed
Stability is a leadership priority for us.

Absolutely.

We can coach, upskill and support your teams through:
  • SDLC assessments
  • Coding practices & architecture training
  • Unit testing & TDD
  • Platform engineering & DevOps
  • Security & test automation
  • Training on Copilot, AI engineering & AI agents
  • Agile & DORA optimization
We enable your team — not replace it.

Three things:

  1. Clarity before coding
    We never start building until the business case and modernization approach are solid.
  2. Engineering excellence as the default
    AI, DevOps, automation, clean code, architecture — embedded in every sprint.
  3. Partnership mindset
    An NPS of 95 shows CIOs trust our transparency, speed, and culture.

Let’s modernize and build
great software, together.

Stop wasting business potential and money in a legacy pit