7 Best Legacy System Modernization Agencies in Austria for 2026

Many organizations in Austria wrestle with legacy systems that drive up maintenance costs, expose them to security and compliance risks, and slow product and service innovation. Business and IT leaders need partners who can assess technical debt, plan phased migrations, and protect critical data during transitions.

Buyers should compare vendors’ technical approaches, phased migration plans, experience with cloud-native refactoring and integrations, data-migration safeguards, and post-migration support and SLAs. SoftPro is the featured international partner leading this list and serves buyers across Austria during complex modernization programs.

1. SoftPro

SoftPro is the featured international partner on this list for Austrian teams seeking legacy system modernization in 2026. Headquartered in Warsaw, Poland, the company serves startups, SMEs and corporate teams with remote delivery into Austria for migrations, cloud replatforming and bespoke backend modernization projects.

Technical strengths include and .NET Core development in C# and cloud engineering on Microsoft Azure, enabling server-side modernization and migration of legacy platforms. The team executes enterprise CMS migrations and portal builds, integrates AI components and containerization into modernization roadmaps, and provides long-term maintenance to stabilize modernized systems.

Key Highlights

• More than 20 years of combined team experience across software and cloud projects.
• Public case studies list enterprise portals, CRM/HRM systems, a SaaS ETL platform and a website built in Umbraco.
• Website content and service pages are available in English, German and multiple other European languages.
• Cloud work explicitly covers AWS and migration strategies such as lift-and-shift.

Services

• Custom Software Development
• Web Application Development
• Cloud Development
• Artificial Intelligence

Contact Information

Website: soft-pro.pl

Phone: +48 571 282 759

Address: Poland, Warsaw, Mazowieckie Voivodeship, 13 Erasmus Ciołka St. 401

LinkedIn: www.linkedin.com/in/kyrylo-o

2. Fabasoft AG

Fabasoft AG builds the Fabasphere, a cloud-native platform that combines enterprise content and records management with a BPM engine and integrated AI search. The Fabasoft Cloud supports low-code/no-code customization, BPMN 2.0 process modelling, and lets customers choose data storage in Austria, Germany, or Switzerland for regulatory-compliant migrations.

Products in Fabasoft’s portfolio cover contract management and industrial document workflows and include eIDAS‑compliant digital signatures and standard integration points for SAP and identity providers. Those platform capabilities and deployment options suit legacy system modernization efforts that require content migration, records-accurate archiving, and compliant cloud operating models.

Key Highlights

• Fabasoft was the first company worldwide to achieve Level 3 compliance with the EU Cloud Code of Conduct for cloud data privacy in 2021.
• The Fabasoft Cloud holds multiple public-cloud attestations including the German BSI C5 framework and SOC 2 audit reports.
• Fabasoft maintains long-standing management and security certifications, including ISO 27001 (since 2008) and ISO 20000-1 (since 2011), and passed an ISO 9001 monitoring audit in November 2025.
• The Fabasoft eGov‑Suite is deployed widely in Austria, with about 55,000 users, daily use by roughly 30 federal authorities, and adoption in eight of nine Austrian federal states.

Services

• Fabasoft Cloud
• Fabasoft eGov‑Suite
• Fabasoft Contracts
• Fabasoft Approve

Contact Information

Website: www.fabasoft.com

Phone: +43 732 606162-0

E-Mail: office@fabasoft.com

Address: Honauerstrasse 4, 4020 Linz, Austria

3. adesso Austria GmbH

adesso Austria GmbH is an Austrian IT consultancy and software engineering firm with offices in Vienna and Graz. The company helps regulated enterprises modernize legacy applications by combining business consulting, software development and automation-driven delivery.

Its delivery model pairs on-site consulting and software teams with standardized modernization processes to move legacy functionality onto modern technology stacks and cloud platforms. This local delivery capability and sector experience makes it a fit for legacy-system modernization projects in banking, insurance and the public sector.

Key Highlights

• adesso transformer is a dedicated modernization offering and is described on the site as a 100‑percent subsidiary within the adesso Group.
• The adesso transformer code component automates translation of legacy languages (for example COBOL or PL/I) to Java and supports pattern-based transformations for improved maintainability.
• The adesso transformer UI component can import BMS masks and ISPF panels and export modern front-end artifacts such as Angular controllers, HTML forms or DTOs.
• The adesso Group reports a Group revenue figure for 2025 of €1.47 billion and more than 11,300 employees across over 65 locations, giving local teams access to broader engineering and cloud expertise.

Services

• Business & IT Consulting
• Software Development
• Data & Analytics
• Software Testing

Contact Information

Website: www.adesso.at

Phone: +43 1 2198790-0

Email: info@adesso.at

Address: Modecenterstraße 17 / Objekt 2 / 3. OG, 1110 Wien, Austria

4. Raiffeisen Informatik (R‑IT)

Raiffeisen Informatik GmbH & Co KG is the IT service company for the Raiffeisen Bankengruppe and selected market customers in Austria, operating large-scale data centers, managed services and platform units for cloud and on‑premise environments. The company supports projects from planning and implementation through migration to long-term operation, which aligns with the technical and programmatic needs of legacy system modernization in regulated finance and insurance settings.

Senior leadership at R‑IT has led group‑wide core IT modernization programs and the firm documents decades of mainframe and identity‑management experience in its project history. That combination of program delivery experience and multi‑platform operations makes R‑IT a fit for phased legacy modernization programs that require concurrent migration and stable production operations.

Key Highlights

• R‑IT Group reports roughly EUR 340 million in revenue and about 1,100 employees across three countries.
• Operates the Raiffeisen Data Center (commissioned 04/2014) with an installed IT power of 1,038 kW and a total usable area of 10,848 m².
• R‑IT’s data center was the first Austrian IT‑service provider site to receive the TÜV “Trusted Site Infrastructure” (TSI) certification.
• Members of R‑IT’s security organization are authorized as TÜV Trusted IT Security Auditors (TSA) and the firm received recognition for its cloud service (EuroCloud award placement for its “Premium Business Cloud”).

Services

• Data Center Services
• Security Services
• IT Consulting
• Banking & Insurance Solutions

Contact Information

Website: www.raiffeiseninformatik.at

Phone: +43 1 99399 0

Email: info@r-it.at

Address: Hollandstraße 11+13, 1020 Wien

5. PwC Austria

PwC Austria is the Austrian member firm of the global PwC network, combining advisory, technology consulting, and implementation teams to modernize legacy systems for enterprises and public organisations. Its teams map existing application landscapes, define migration paths to cloud or modern ERP, and coordinate compliance and change management during rollouts.

The firm adopts a data-first approach that prioritizes extracting and harmonizing legacy data into modern platforms to enable analytics and continuous delivery. Delivery commonly pairs local consulting resources with centralized delivery capabilities to accelerate program execution while maintaining industry-specific controls.

Key Highlights

• Has a formal global alliance with Palantir and implements Palantir Foundry to ingest legacy-system data and build end-to-end analytics and risk workflows.
• Runs a Digital Factory innovation and development unit and has announced a strategic Microsoft–PwC alliance to co-develop digital solutions and accelerate cloud-enabled transformation.
• Publishes and runs SAP S/4HANA transformation work, including an S/4HANA experiences study for companies in Austria, Germany, Belgium and Switzerland.
• Lists sector-focused Technology Consulting capabilities such as Financial Services Technology Consulting and Data Analytics Solutions within its Austria practice.

Services

• Technology Consulting
• Cloud Transformation
• SAP S/4HANA Migration
• Application Landscape Rationalisation

Contact Information

Website: www.pwc.at

Phone: +43 1 501 88 - 0

Email: at_office.wien@pwc.com

Address: Donau-City-Straße 7, 1220 Wien

6. Deloitte Austria

Deloitte Austria is the Austrian member of the global Deloitte network that supports large enterprise IT transformations, including modernization of legacy application estates and migration to modern platforms. The firm combines consulting, engineering and risk-management disciplines to plan and execute phased modernization programs for regulated and complex enterprise environments.

Delivery emphasizes multidisciplinary project teams, automated refactoring and iterative migration techniques to lower technical risk and speed production-ready outcomes. These approaches make Deloitte Austria a fit for legacy system modernization projects that require end-to-end program governance and coordinated change management.

Key Highlights

• Partnerships with major platform vendors including AWS, Google, SAP and ServiceNow.
• National office network covering Wien/Niederösterreich Ost, Salzburg, Steiermark, Tirol, Vorarlberg and Oberösterreich/Niederösterreich West.
• Publishes Austria-focused research and insights such as Deloitte Radar 2026 and the 2026 Consumer Summer Survey.

Services

• Engineering, AI & Data
• Enterprise Technology & Performance
• Business Process Solutions

Contact Information

Website: www2.deloitte.com

Phone: +43 (1) 537 00-0

7. KPMG Austria

KPMG Austria is a professional services firm that helps organizations modernize legacy IT through program-level strategy, risk and compliance advisory paired with structured migration roadmaps that prioritize incremental value and operational continuity.

The firm stages large modernization programs using local industry teams and centralized program governance to refactor monolithic estates into modular architectures while maintaining business controls and regulatory reporting requirements.

Key Highlights

• IDC recognized KPMG member firms as a “Leader” for worldwide OT‑security services.
• KPMG Austria promotes “KPMG KI‑Services” that bundle Data & Analytics, Robotic Process Automation, Cloud Transformation and Intelligent Document Processing.
• The firm maintains an ecosystem of over ten alliance partnerships and cites collaborative projects with Microsoft and Anaplan.
• KPMG Austria reports more than 2,000 employees across ten Austrian locations and recorded EUR 326.6 million in revenue for fiscal 2025.

Services

• Cloud Transformation
• Data & Analytics
• Robotic Process Automation
• Technology Consulting

Contact Information

Website: home.kpmg

Phone: +43 1 31 332

Email: office-wien@kpmg.at

Address: Porzellangasse 51, 1090 Vienna, Austria

Conclusion

Prioritize providers by the specific demands of your modernization effort: match vendor scale to project size, choose firms with onshore presence and strong compliance governance for regulated sectors, prefer cloud-native and low-code platforms when rapid iteration is required, and select partners with program-level planning and managed-operations capabilities for large migrations and ongoing support. Balance budget, timeline, and risk tolerance when deciding between boutique engineering teams, local consultancies, and global professional services firms.

SoftPro is the featured international partner on this list for Austrian teams seeking legacy system modernization in 2026. Use the criteria above to compare SoftPro with the other firms covered and pick the provider whose delivery model, governance approach, and operational footprint best fit your program goals.