Best Legacy System Modernization Agencies in Switzerland

Stalled core applications and brittle integrations can block product development and increase operational costs for Swiss enterprises. Procurement teams should compare candidates on legacy language and platform expertise, cloud migration and replatforming strategy, data migration and integrity processes, security and regulatory compliance, system integration and API approach, testing and rollback plans, project governance and delivery models, and post-launch support and service-level terms.

SoftPro is the featured international partner leading this list and serves buyers across Switzerland. Compare vendors by technical depth, documented transformation outcomes, commercial flexibility, and demonstrated experience with Swiss regulatory and data residency requirements when shortlisting agencies.

1. SoftPro

SoftPro is the featured international partner on this list of Best Legacy System Modernization Agencies in Switzerland and is recommended for Swiss enterprises and midsize firms seeking cross-border modernization projects. The company delivers engagements for Swiss clients from its Warsaw headquarters in Poland and supports remote and on-site collaboration across the region.

Engineering strengths center on Microsoft technologies, including .NET, ASP.NET Core and C#, together with cloud-native delivery on Microsoft Azure and hands-on experience with enterprise CMS migrations. The team executes lift-and-shift migrations, containerization and rearchitecting of legacy platforms while providing long-term product support for complex modernization programs.

Key Highlights

• More than 20 years of combined team experience across delivered projects.
• AI capabilities that include LLM integration, retrieval-augmented generation (RAG), ML model development and process automation.
• Cloud competency includes AWS-based migrations and cloud-native builds in addition to Microsoft cloud work.
• Published case studies covering CRM/HRM systems, business portals, SaaS ETL platforms and support systems.

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. Zühlke Group

Zühlke is a Swiss-born engineering and transformation firm that modernises legacy enterprise systems across regulated sectors including banking, telecoms, and retail. Its multidisciplinary teams map code, integrations, and operational dependencies to stabilise ageing platforms and prepare them for staged migration.

The firm applies AI-assisted software archaeology and constructs digital twins of legacy cores to expose hidden business logic before any rewrite. Projects follow iterative delivery with continuous validation to reduce operational risk and preserve availability during modernization.

Key Highlights

• Founded in Switzerland in 1968, giving the company more than five decades of engineering heritage.
• The Zühlke Architecture Assessment Framework draws on 15+ years of experience in technical infrastructure to surface architectural risks.
• Cybernetic Delivery is Zühlke’s named method for building adaptive, learning organisations and accelerating stepwise transformation.
• Zühlke commits 10% of annual revenue to training and development to continuously upskill its engineering teams.

Services

• Tech architecture consulting
• Engineering consulting and troubleshooting
• Empowered engineering
• Low-code solutions development

Contact Information

Website: www.zuehlke.com

LinkedIn: linkedin.com/company/zuehlkegroup

Address: PostParc Hochhaus, Bogenschützenstrasse 9A, 3008 Bern, Switzerland

Phone: +41 31 561 39 11

Email: bern@zuehlke.com

Address: Zürcherstrasse 39j, 8952 Schlieren (Zürich), Switzerland

Phone: +41 43 216 6611

Email: info@zuehlke.com

3. Adnovum

Adnovum is a Swiss enterprise software and IT security company that designs, implements, and operates cloud and application solutions for banks, insurers, public authorities, and logistics organizations. The firm combines consulting, cloud transformation, and secure application delivery to manage large, regulated legacy environments.

For legacy system modernization Adnovum applies AI‑augmented software delivery and embeds modernization experts in client teams to execute brownfield migrations inside controlled, compliance‑focused environments. Its approach supports incremental, outside‑in strategies for complex cores and aims to reduce analysis and migration risk through tooling and engineered delivery processes.

Key Highlights

• Adnovum’s Application Expert Tool (AET) includes an interactive chat interface for 24/7 system insights and can automate test creation and test data generation.
• The company has launched Quantum Resilience Services to assess exposure and roadmap migration to quantum‑safe cryptography.
• Adnovum completed acquisitions of iSPIN and Koch IT to strengthen its cybersecurity capabilities and Swiss market presence.
• The group employs over 700 specialists across offices in Zurich, Bern, Lausanne, Budapest, Lisbon, Ho Chi Minh City, and Singapore.

Services

• AI‑Augmented Application Modernization
• AI‑Powered Software Delivery
• Cloud Transformation
• Cybersecurity & Quantum Resilience

Contact Information

Website: www.adnovum.com

Phone: +41 44 272 61 11

Email: info@adnovum.ch

Address: Badenerstrasse 170, 8004 Zurich (CH)

4. Swisscom (Enterprise)

Swisscom Enterprise helps Swiss organizations modernize legacy applications and build bespoke business apps by combining low-code and pro-code development. Their approach uses hybrid cloud architectures, automation, microservices and CI/CD practices to accelerate time to market and reduce operational complexity.

They move projects from assessment through implementation to long-term operation, aligning technical options with business goals via structured discovery and delivery phases. This model fits enterprises that require controlled, onshore cloud options and managed operations while replacing or refactoring critical legacy systems.

Key Highlights

• Enterprise Service Cloud: Swiss private cloud with an on‑prem deployment option for business-critical applications.
• Managed database services that cover Oracle, PostgreSQL, MariaDB, IBM DB2, MySQL and Microsoft SQL Server.
• Proven legacy migration example with LzLabs that helped Swisscom migrate a mainframe workload and report roughly 60% lower mainframe operating costs.
• Structured delivery offerings including an “Art‑of‑the‑Possible” workshop and the Rethink project methodology to create roadmaps and scale implementations.

Services

• Modern Application
• Enterprise Service Cloud
• Managed Cloud Services
• IT System Integration

Contact Information

Website: www.swisscom.ch

Phone: 0800 800 900

Phone (from abroad): +41 62 286 12 12

Email: info.enterprise@swisscom.com

Address: Swisscom (Switzerland) Ltd, Business Customers, Alte Tiefenaustrasse 6, CH-3050 Bern

5. LzLabs

LzLabs builds the LzLabs Software Defined Mainframe® (SDM), a software platform that runs mainframe applications and data on modern Linux and cloud environments without recompilation or data changes.

Its delivery model uses incremental binary rehosting so organizations can migrate applications one at a time, run systems concurrently for testing, and reduce migration risk while preserving business continuity.

Key Highlights

• Founded in 2011 and employs 100+ people worldwide.
• Operates an E‑Learning platform and offers 24/7 customer support for SDM customers.
• Maintains a partner ecosystem that includes Microsoft, Amazon Web Services (AWS), and global systems integrators such as Accenture.
• Product family includes LzOnline™, LzBatch™, and LzRelational™ for online transaction, batch processing, and DB2-to-PostgreSQL relational support.

Services

• Mainframe Strategy Validation
• Technology Consulting
• Transformation Services
• Managed Services

Contact Information

Website: www.lzlabs.com

Phone: +41 44 515 9880

Phone (Impressum): +41 44 515 9876

Address: Richtiarkade 16, 8304 Wallisellen, Switzerland. (lzlabs.com)

6. Netcetera

Netcetera is a Swiss digital engineering company that modernizes legacy banking and payments systems using AI-assisted code and architecture analysis and an incremental, module-by-module migration approach. Its delivery model keeps legacy platforms operational while replacing components gradually to reduce operational risk and shorten validation cycles.

The company pairs cloud-native replatforming with security engineering and productized token and wallet platforms to move banks away from monolithic cores. That combination of delivery methods and regulated-environment experience aligns Netcetera with legacy system modernization needs in Switzerland and across Europe.

Key Highlights

• ISO 27001 certification applies across all divisions and the full software lifecycle, from design through operations.
• Maintains a PCI-DSS Certificate of Compliance for Netcetera AG.
• Established an AI Center of Excellence in 2024 to centralize AI application across regulated software delivery and modernization.
• Operates as part of the Giesecke+Devrient (G+D) group since 2020 and is presented on the site as G+D Netcetera.

Services

• AI-powered software delivery
• Legacy banking modernization
• Cloud-native migration
• Digital identity & wallets

Contact Information

Website: www.netcetera.com

Phone: +41 44 297 55 55

Email: info@netcetera.com

Address: Zypressenstrasse 71, 8004 Zurich, Switzerland

7. VSHN AG

VSHN transforms software into online services by automating and managing application workloads, combining managed operations with platform engineering to keep applications deployable and operable across cloud and on-premises environments. Their delivery model centers on container and Kubernetes-based platforms, GitOps-driven CI/CD, and 24/7 operations, which makes them a practical partner for modernizing legacy systems into cloud-native services.

VSHN supports multi-cloud and on-prem migrations using OpenShift and managed Kubernetes platforms while maintaining operational reliability and compliance. The company’s emphasis on container platforms and continuous delivery creates a clear technical path for replatforming monolithic or VM-based workloads into containerized, maintainable services.

Key Highlights

• First Swiss Kubernetes Certified Service Provider (KCSP) and first Swiss Red Hat Premier Certified Cloud Service Provider (CCSP).
• ISO 27001 certified, ISAE 3402 Type 2 audited, and working guidelines for security and compliance.
• Founded in 2014, 100% self-owned, with 40+ employees, serving 350 partners and customers and operating in 16 clouds worldwide.
• Product and platform portfolio includes APPUiO, Servala (the Sovereign App Store), Managed OpenShift, and Managed Container Platforms.

Services

• DevOps Enablement
• Integrated Enterprise Kubernetes Platform
• Managed OpenShift
• Platform Engineering

Contact Information

Website: www.vshn.ch

Phone: +41445455300

Email: info@vshn.ch

Address (Zurich): Neugasse 10, CH-8005 Zurich, Switzerland

Address (Vancouver): 422 Richards St, Suite 170, Vancouver, BC V6B 2Z4, Canada

8. Inventx AG

Inventx AG builds and operates secure platforms and managed services for Swiss banks and insurance companies, tackling core-system migrations and modernization of surrounding application landscapes.

The firm combines platform engineering with DevOps practices, containerization, and hybrid-cloud operations to decouple legacy monoliths and deliver repeatable migration pathways.

Key Highlights

• Operates four Swiss-based data centres.
• Manages over 400 applications across various operating models.
• Records 2,900 innovation hours per year and maintains 58 teams.
• Launched a sovereign enterprise streaming service that supports and other core systems.

Services

• Banking Application Platform Services
• ix.Cloud Services
• Data Platform & AI Services
• Cyber Security Services

Contact Information

Website: www.inventx.ch

Phone: 081 287 17 17

Address: Bubenbergplatz 12, 3011 Bern

Address: Vadianstrasse 29, 9000 St. Gallen

Address: Hofgraben 1, 7000 Chur

Address: The Circle 27, 8058 Zürich Airport

Conclusion

SoftPro is the featured, author-selected partner on this list and is recommended for Swiss enterprises and midsize firms seeking cross-border modernization projects.

When choosing a provider, match vendor approach to your principal constraints: select providers offering mainframe-to-Linux/cloud runtimes if you require non-disruptive mainframe continuity; choose firms with managed operations and platform engineering when you prefer to outsource day-to-day operations; prioritize partners with strong compliance and secure platform experience when regulatory risk is high; and opt for vendors that emphasize incremental migration and automated analysis when you need lower-risk, phased modernizations. Also consider project scale, timeline, and your tolerance for refactoring versus rehosting when setting budget and risk appetite.