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Legacy software modernization for SMBs

We modernize custom software no new hire wants to touch — in-house ERPs, applications still issuing invoices, legacy .NET or Angular systems. Together we decide what to extend, what to migrate and what to replace. Without stopping the business.

Stack we choose with you
Staged, no downtime
Maintainable code

Companies that trust VisibleSoft

Tap a logo to read the testimonial

What we value most is transparency. If an idea doesn’t add value, they tell us; if a change is going to cost more than expected, they warn us in advance. We work without surprises.

Luis Gálvez Director · Efícalo Translated from Spanish

Working with VisibleSoft was different from the start: no marketing-speak, they offered a concrete solution and delivered it in sprints, with demos every two weeks.

Francisco Rubio Director · EPMTIC Translated from Spanish

VisibleSoft understood our process in the first meeting and turned it into a tool we use every day. They meet deadlines and they listen.

Carmen Pont CEO · BAI Formación Translated from Spanish

Thanks to VisibleSoft’s attention and professionalism, we were able to make our company much more efficient and optimized.

Alejandro Rodríguez Manager · Cerrajería Carlos Rodríguez Translated from Spanish

For businesses that have outgrown their software, not their business

Your system works. It was built 8, 12, 15 years ago. It does its job — but no new hire wants to touch it.

It does its job. But nobody new wants to use that UI, reports are exported to Excel and re-touched by hand, and every time someone says "we should integrate X with Y" the current vendor asks for six months and €80,000.

What follows is a staged strategy with two-week sprints, demos at the end of each one and code your next vendor can maintain if we disappear.

Custom software modernization

Know the price before the first meeting

Five productized services with fixed scope, defined deliverables and indicative pricing. The closed estimate comes after a qualification call.

Technical audit

Technical audit

From €1,800 · 1 week

Who it's for

Businesses that have a hunch ("this is getting old") but need data before they invest.

What's included

  • Review of the current stack and technical debt
  • Architecture analysis and critical points
  • Identification of security and maintainability risks
  • Cost estimate per strategy (extend, migrate, replace)
  • Recommended roadmap in phases

What's NOT included

Implementation, new code, team training.

Timeframe

5 working days.

Deliverable

15–25 page PDF + 1-hour presentation session.

Price

€1,800 (small systems) to €3,500 (medium systems with several modules).

Request audit
Modernization sprint

Modernization sprint

€8,500 · 4 weeks

Who it's for

Businesses that already know where it hurts (a module, a critical screen, a brittle integration) and want to validate how we work before committing to a bigger project.

What's included

  • Technical design (week 1)
  • Implementation in two-week sprints
  • 2 live demos at the end of each sprint
  • Production deployment at the end
  • Technical documentation handed over

What's NOT included

Full visual redesign, massive data migrations, additional modules outside the agreed scope.

Timeframe

4 weeks from signature.

Deliverable

Module in production + repository + documentation.

Price

€8,500 (fixed, closed price).

Start a sprint
Full .NET legacy modernization

Full .NET legacy modernization

From €25,000 · 3–6 months

Who it's for

Businesses with a .NET Framework 4.x, ASP.NET Web Forms or WinForms application that is no longer sustainable and needs migrating to modern .NET while preserving business logic.

What's included

  • Detailed technical audit (weeks 1–2)
  • Staged migration plan (week 3)
  • Two-week sprints with live demos
  • Data migration with validation
  • Functional and regression testing
  • Phased production deployment
  • 30 days of post-go-live support included
  • Technical documentation and operations manual

What's NOT included

Undocumented functional changes, integrations with third-party systems outside scope.

Timeframe

3–6 months depending on size.

Deliverable

Migrated system in production + repository + 30-day support.

Price

Small (1–3 modules) €25,000–40,000. Medium (4–8 modules) €40,000–75,000. Large, bespoke after audit.

Request a proposal
AI agent connected to your system

AI agent connected to your system

From €5,500 + retainer · 4–6 weeks

Who it's for

Businesses with an already-working system that want to add a conversational or automatic-processing AI layer: AI receptionist, WhatsApp chatbot, invoice processor, internal assistant.

What's included

  • Use-case discovery (week 1)
  • Technical design and model selection
  • Implementation with integration into your system
  • Two-week sprints with live demos
  • Production deployment
  • Basic AI Act documentation

What's NOT included

Training proprietary models from scratch, on-premise inference infrastructure (separate engagement).

Timeframe

4–6 weeks.

Deliverable

Agent in production + monthly retainer for monitoring and cost control.

Price

Implementation €5,500–9,000. Retainer €250–400/month (monitoring + LLM cost control + minor tweaks).

See AI cases
Managed DevOps platform

Managed DevOps platform

From €1,490/month

Who it's for

Companies with an in-house or external development team that need infrastructure, CI/CD, monitoring and backups without hiring a full-time DevOps.

What's included

  • GitLab self-hosted or managed
  • Up to 5 servers (more on request)
  • Configured and maintained CI/CD pipelines
  • Automatic backups with periodic verification
  • 24/7 monitoring with alerts
  • Secrets and certificate management
  • 4-hour SLA on critical incidents during business hours
  • Monthly usage report and recommendations

What's NOT included

Application development (handled separately).

Timeframe

Monthly recurring service.

Deliverable

Operational infrastructure + monthly report.

Price

Up to 5 servers €1,490/month. 6–10 servers €2,290/month. More than 10, bespoke. Annual contract with 90-day notice.

Talk about managed DevOps

How we choose the tech for your project

We don't marry a stack. We pick the one that fits your business, your team and the long-term maintenance you need.

Stability before hype

We favour mature platforms with an active community. The latest hype library rarely survives its first year in production.

Use what you already have

If your team already knows a technology or your current system fits a specific stack, we use it. We don't rewrite for the sake of rewriting.

Maintenance cost

A tech choice is a multi-year commitment. We work out what it'll cost you to keep it running after we're gone.

Ownership and portability

No solutions that lock you in to a single vendor. The code and the data are yours.

We typically work with Microsoft (.NET) and JavaScript (Angular, Node.js) stacks, but we've integrated projects with Java, Python, Flutter or Firebase when the situation called for it.

How we deliver

Three phases. Closed timeframe in writing before we start.

1

Diagnostic and scope

Discovery + technical audit if needed. Proposal with timeframe, price and deliverables signed before we write the first line of code.

2

Two-week sprints with demo

Iterative delivery. Live demo at the end of every sprint. Changes go into the next sprint, not into a "later" pile.

3

Deployment, support and evolution

Phased production rollout. 30 days of post-go-live support included. Optional maintenance contract afterwards.

Read the full process

Ready to start with an audit?

The qualification call is free. The full technical audit starts at €1,800 and already hands you an actionable roadmap, whether or not you continue with us.