AI-Native Legacy Software Modernization Company
Accedia is a European software engineering company delivering AI-augmented legacy modernization through 250+ in-house engineers. Our teams lead the work from assessment through migration, using AI tools and agents to support dependency mapping, code analysis, refactoring, and testing. We upgrade or rebuild applications, migrate data from outdated platforms, and connect existing systems with modern technologies through phased delivery that keeps critical business operations running.
Our Track Record in Numbers
80+
Legacy Modernization Projects
Delivered for 50+ clients across industries.
14+
Years of Experience
Spanning legacy platforms, cloud and modern architectures.
91%
Client Retention Rate
Most clients stay with use well beyond the first project.
Top 1%
Technology Talent
Selected through a rigorous, multi-stage hiring process.
What Makes Legacy Modernization Challenging
Modernizing business-critical software comes with three common pain points:
- Scoping is slow and expensive. Without a full map of system dependencies, costs and timelines are guesswork.
- The business cannot stop. The old system must stay live throughout, yet most plans assume downtime you cannot afford.
- Critical logic is undocumented. Key rules live in a few people’s heads and are easily lost in the rewrite.
Legacy Modernization Services We Provide
Legacy Consulting & Strategy
We map your architecture, technical debt, and dependencies, then help you choose between refactoring, replatforming, and rebuilding.
Software Re-engineering
We refactor outdated applications, including VB6, Windows Forms, legacy Java, and .NET Framework, using AI tools to support code analysis and testing.
System Migration
Your current system stays available the whole time. Applications and workloads move onto supported platforms in stages, never in one cutover.
Cloud-Native Re-architecting
We break the monolith into modular services. Each part then scales and deploys independently.
API Modernization and System Integration
APIs let new software reach the old system, so components can be replaced one at a time rather than all at once.
Legacy Data & Database Modernization
Your data comes off AS400, IBM DB2, OpenEdge, or on-premises SQL Server, with schemas reshaped so automation and AI tools can query it directly.
Multi-Agent Framework for Software Development
Explore our multi-agent framework that helped us modernize a +1M lines of legacy code for 20 days.
See Our Multi-Agent FrameworkWhy Choose Accedia as Your Application Modernization Company
- Established AI Expertise. Our dedicated AI Capability Center has delivered 50+ AI projects across industries, bringing expertise in machine learning, generative AI, and AI agents to our modernization work.
- Business Continuity. We release in stages, keep the legacy platform running as a fallback, and agree rollback triggers before go-live.
- Experience in Security-Sensitive Industries. We modernize systems in finance, manufacturing, automotive, and energy, certified to ISO 27001 and TISAX.
- Established Technology Partnerships. We partner with Microsoft Azure, AWS, Databricks, and Anthropic, supporting modernization across cloud infrastructure, data platforms, and AI.
Business Development Director
Temenuzhka Kurteva
Temenuzhka is a Business Development Director with 10+ years of experience in the IT sector. She specializes in building product teams, strategy analytics, business planning, and team effectiveness.
Technology Stack
Code & Frameworks
AI & ML
Data & Analytics
Cloud services
DevOps & CI/CD
Our Approach Explained
1
Technology Audit
Assess code, dependencies, and risks. Deliver a prioritized roadmap, validation plan, effort estimates, and rollback criteria.
2
Strategy & Architecture Planning
Prioritize systems by business importance, technical risk, and dependencies. Decide what to refactor, replace, or leave unchanged.
3
Implementation & Development
Components are refactored, migrated, or rebuilt one at a time. Live operations keep running throughout.
4
Testing & Validation
Test existing functionality, compare old and new system behavior, and verify results before deployment.
5
Controlled Rollout & Monitoring
Release changes gradually, monitor performance, and maintain rollback options if problems arise.
Embrace: A Live Back-End Modernized While Two Products Merged
A Dutch cloud platform for housing corporations and municipalities needed its older Workspace intranet folded into Embrace Social without interrupting customers, and the back end modernized along the way. That back end runs around 290,000 lines of C# across 68 projects. With AI agents writing specifications and opening pull requests under human review, pull requests now close about twice as fast.
SKF: A Catalogue App Rebuilt as a Field Technician’s Tool
Bearing Assist is a web and mobile application that mirrored a bearing product catalogue, with legacy code and architecture constraining delivery speed and quality. The team replaced the outdated frameworks and libraries while delivering value incrementally, and established a design system, behavior-driven testing, and CI/CD pipelines.
Legacy Modernization Work We Have Delivered
Embrace: A Live Back-End Modernized While Two Products Merged
A Dutch cloud platform for housing corporations and municipalities needed its older Workspace intranet folded into Embrace Social without interrupting customers, and the back end modernized along the way. That back end runs around 290,000 lines of C# across 68 projects. With AI agents writing specifications and opening pull requests under human review, pull requests now close about twice as fast.
SKF: A Catalogue App Rebuilt as a Field Technician’s Tool
Bearing Assist is a web and mobile application that mirrored a bearing product catalogue, with legacy code and architecture constraining delivery speed and quality. The team replaced the outdated frameworks and libraries while delivering value incrementally, and established a design system, behavior-driven testing, and CI/CD pipelines.
FAQ
Which companies provide legacy software modernization services?
Legacy software modernization companies help businesses update outdated applications while preserving critical functionality and minimizing disruption. Their services cover code and dependency analysis, re-engineering, migration, system integration, and testing. Accedia, for example, modernizes business-critical platforms through phased delivery and AI-assisted engineering. For Embrace, Accedia kept its legacy intranet running while updating its .NET-based platform, with AI-assisted workflows helping reduce code review and merge times by approximately 50%.
How can we avoid downtime or business risk when moving legacy applications to cloud or modernizing critical systems?
To reduce downtime, avoid moving everything at once. Start by mapping dependencies and identifying which business processes must remain available, then migrate lower-risk components while the original system continues running. During the transition, keep data synchronized and compare results across both environments, including critical workflows and edge cases. Once the new components pass these checks, gradually move users over, monitor performance, and keep a rollback plan ready in case problems arise.
How long does it take to modernize an existing application?
The timeline depends on what needs to change and how much of the existing application can be reused. A straightforward move to a newer platform may take 2–4 months, while a complete rebuild can take 12–24 months. The actual timeline also depends on undocumented dependencies, third-party integrations, data migration, and the testing needed to preserve existing functionality. At Accedia, we typically approach larger projects in stages, allowing improvements to go live gradually while the existing system continues supporting business operations.
What are the main challenges and risks when changing legacy systems?
Undocumented dependencies and years of custom fixes make it difficult to predict whether changing one component will disrupt another. To address this, Accedia’s engineers use AI-assisted analysis to trace connections across the codebase and identify unused code, then verify the findings to plan upgrades around those dependencies. Data migration introduces a separate risk: incomplete or inconsistent records can affect business results. We reconcile migrated data and test critical workflows before each release to confirm that the upgraded system preserves essential functionality.
Let's Discuss Your Modernization Project
Tell us about your current system and what you want to improve. Whether you have a clear plan or are unsure where to start, our team can help you explore the next steps. What to expect:
- A call with a member of our leadership team.
- An initial discussion of your needs, challenges, and options.
- A proposal outlining the recommended approach, scope, and next steps.
