Best Legacy System Modernization Companies in Sweden

Many organizations in Sweden face aging mainframes and fragmented application landscapes that slow development, raise operational costs, and complicate compliance. Buyers evaluating legacy system modernization vendors should compare migration strategy, data migration and integration processes, security and regulatory compliance, change-management services, total cost of ownership, and clear delivery milestones.

SoftPro is the featured international partner leading this list and serves buyers in Sweden as an international partner. Compare SoftPro and other providers on transparent pricing, delivery methodology, references for similar modernizations, and the availability of Swedish-language support and local coverage.

1. SoftPro

SoftPro is the featured international partner on this list for readers seeking legacy system modernization in Sweden and is recommended for mid-market and enterprise projects that require phased replatforming, API-led integrations, and cloud migration roadmaps. Delivering from a Warsaw, Poland headquarters, SoftPro runs remote and hybrid engagements for Swedish clients that need coordinated cross-border delivery teams.

SoftPro executes modernization projects on the Microsoft stack with and .NET Core and conducts Azure-based cloud and migration work while integrating modern front-end frameworks and API-driven architectures. The company pairs full-stack development and cloud engineering with enterprise CMS migration experience to refactor legacy applications into modular, maintainable platforms.

Key Highlights

• Umbraco website project listed as a case study, demonstrating hands-on CMS migration and site rebuild experience.
• Website includes a Swedish language option, indicating active targeting of the Swedish market.
• Cloud migrations include AWS support, enabling hybrid cloud strategies.
• Provides ongoing support and maintenance for deployed applications across the full software lifecycle.

Services

• 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. Provito AB

Provito modernizes aging enterprise applications by migrating legacy codebases, including Visual Basic 6 and Visual C++, into modern C# and .NET Core/.NET 8 architectures and converting desktop applications to web-based, API-driven systems. They combine zero-downtime migration practices with human-reviewed, AI-assisted delivery to keep changes traceable and approved before deployment.

Their delivery model targets retail operators and multi-store environments with hands-on integration of pricing, inventory, and point-of-sale systems to preserve business logic during modernization. The core team pairs long-tenured senior engineers and structured project leadership to maintain production systems while planning cloud migrations and optimizations.

Key Highlights

• Founded in 2009 with 15+ years of continuous legacy modernization experience.
• Acts as the technical backbone behind StoreOffice, a Nordic retail backoffice used by major chains including ICA and COOP.
• Proven at scale: handles millions of transactions daily and supports thousands of stores on a daily basis.
• Microsoft cloud and data coverage explicitly listed: SQL Server 2008–2022, Azure App Services, Azure SQL, Azure Functions, and Azure DevOps CI/CD.

Services

• Custom Software Development
• IT Project Management & Consulting
• Problem Solving & Troubleshooting
• Requirements Engineering & Analysis

Contact Information

Website: www.provito.se

Email: info@provito.se

Address: Skinnskatteberg, Sweden

3. CodeBridge

CodeBridge is a Swedish software studio that builds tailored web and mobile systems and takes ownership of aging, business‑critical platforms to make them maintainable and secure.

They partner with company leaders and IT teams to define realistic modernization roadmaps and deliver projects from initial discovery through ongoing operation.

Key Highlights

• The site lists 10+ years of experience and more than 50 completed projects.
• Technology choices explicitly mentioned include React, TypeScript, cloud infrastructure, and modern APIs.
• The modernization offering includes technical due diligence that analyzes architecture, codebase, database, and integrations.
• Published case work highlights replacing a legacy loan‑management system for a finance client and modernizing a 15‑year‑old ERP with zero downtime.

Services

• Custom applications
• Legacy modernization
• Applications for startups

Contact Information

Website: codebridge.se

Phone: +46 76-765 64 18

Email: info@codebridge.se

Email: jens.lindstrom@codebridge.se

Address: Sweden

4. Gaia System AB

Gaia System AB modernizes legacy systems by analyzing existing business processes and migrating data and functionality into Microsoft-centered platforms while keeping working parts in production during phased transitions. Their technical approach emphasizes extracting reliable data, rebuilding semantically consistent models, and using Microsoft tools to reduce migration risk.

The team pairs an AI-first mindset with cloud-native delivery, building a trusted data foundation before layering predictive models and Copilot integrations. This stepwise delivery reduces disruption and lets organizations adopt Fabric, Azure, Power BI, .NET, and SQL Server capabilities while preserving business continuity.

Key Highlights

• Gaia is a certified Microsoft AI Cloud Partner with verified competencies in dataplatforms and AI solutions.
• The company traces its experience back to 1995 and markets itself with more than 30 years of domain experience.
• Gaia declares a 100% Microsoft focus and has delivered Fabric Real-Time Intelligence and event-stream projects using Azure Event Hub and KQL.
• Client references on the site include customers such as Returpack, Holmen, and Ottobock, and the site features a long-term Returpack case study.

Services

• Dataplattformar
• Fabric IQ & Real-Time
• Verksamhetsnära system
• Legacy modernisering

Contact Information

Website: www.gaia.se

Phone: 010-331 99 00

Email: info@gaia.se

Address: S:t Persgatan 27, 602 33 Norrköping, Sweden

5. Esatto AB

Esatto AB is a Swedish digital partner that builds and modernizes business‑critical systems, converting legacy code into platforms teams actually want to work in. Their teams combine engineering, design, and product thinking to deliver scalable, reliable systems aligned with business priorities.

Esatto emphasizes measurable outcomes and product‑oriented delivery to make modernization contribute to long‑term growth. The firm frames modernization as part of a broader offering that connects platform development and customer‑facing digital products to organizational change.

Key Highlights

• Just over 70 specialists work at Esatto, according to the company site.
• Offices and delivery locations include Stockholm, Gothenburg and Jönköping in Sweden plus a Kraków office in Poland.
• Esatto is a member of the Dizparc group and collaborates with sister agencies across Sweden.
• Public case work on the site lists clients and projects such as Aller Media, Svedea and Nybergs Bil.

Services

• System Development & Modernization
• AI Acceleration Program
• Nearshoring
• Customer Experience & E‑commerce

Contact Information

Website: esatto.se

Address (Stockholm): Drottninggatan 94, 111 36 Stockholm, Sweden

Phone (Stockholm): +46 8 23 43 43

Address (Kraków): ul. Wielopole 1, 31-072 Kraków, Poland

Phone (Kraków): +48 576 12 4 171

Address (Gothenburg): Kvarnbergsgatan 2, 411 05 Göteborg, Sweden

Phone (Gothenburg): +46 72 389 23 08

Address (Jönköping): Parkgatan 2, 553 21 Jönköping, Sweden

Phone (Jönköping): +46 72 644 07 00

6. Creatum

Creatum is a Stockholm-based consultancy that modernizes and future‑proofs business‑critical systems through incremental, low‑risk delivery rather than full rewrites. They work with complex system landscapes where continuity and operational stability matter and tailor modernization paths to the existing architecture.

The firm pairs technical analysis with domain understanding to prioritize modernization work and reduce technical debt while keeping control over change. Their approach centers on stepwise migration, clear traceability of changes, and documented architectural decisions to make long‑term maintenance and verification practical.

Key Highlights

• Uses Architecture Decision Records (ADR) to document and govern architectural choices.
• Reports use of AI-assisted developer tools named on the site: Claude Code, Cursor, and GitHub Copilot.
• Builds traceability that can map generated or changed code back to original components and applies automated verification and testing during modernization.
• Lists senior leadership on the company page, including founder Patrik Jonsson and CEO Kristian Miljeteig.

Services

• System modernization
• Migration & transformation
• System development
• AI & automation

Contact Information

Website: www.creatum.se

Address: Vasagatan 28, 111 20 Stockholm

7. CAG (CAG Mer Consulting)

CAG MER Consulting helps banks, insurers and financial authorities modernize and stabilize core legacy systems in highly regulated, system‑critical environments. The firm turns business, technical and regulatory change into solutions that run reliably in daily production.

Delivery is led by senior consultant teams with clear mandates to run long-term transformations while keeping operations running. Their approach prioritizes minimizing operational impact and ensuring solutions meet compliance and audit requirements.

Key Highlights

• Founded in 1984 and integrated into the CAG Group in 2018.
• Lists AI in Financial Environments and Markets & Post-trade Transformation among its service areas.
• Specifies SAFe, Lean and Scrum as delivery frameworks under its competencies.
• States compliance capabilities that include Anti‑Fraud, AML, MiFID, EMIR and Solvency requirements.

Services

• AI in Financial Environments
• Data & Decision Platforms
• Markets & Post-trade Transformation

Contact Information

Website: www.cag.se

Phone: +46 (0)70 897 89 94

Email: markus.akesson@cag.se

Address: Sveavägen 33, 111 34 Stockholm

8. Frontwalker AB

Frontwalker is a Sweden-headquartered software development company that modernizes legacy systems and delivers new cloud-native software by combining local Nordic solution engineers with a global engineering delivery center in Sri Lanka. They emphasize rebuilding legacy platforms to modern technology stacks while maintaining operational stability and moving toward AI-accelerated delivery.

Their delivery model uses dedicated application teams, end-to-end project workstreams, and a licensing/support offering that supports long-term ownership and continuous modernization efforts. This combination of local market insight, global engineering capacity, and AI-assisted engineering makes them a practical choice for legacy system modernization projects.

Key Highlights

• 35+ years of company experience stated on the site.
• 250+ projects delivered according to the site’s summary metrics.
• 150+ engineers listed as part of their delivery capability.
• Publishes an “Always on” offering with a 99.9% uptime target for critical services.

Services

• Classic
• Always on
• Licensing
• Projects

Contact Information

Website: frontwalker.com

Address: c/o Convendum, Drottninggatan 29, 111 51 Stockholm

Phone: +46 708 226 602

Email: stockholm@frontwalker.se

Address: Colombo Innovation Tower, 14th Floor, 477, R. A. De Mel Mawatha, Colombo 04, Sri Lanka

Phone: +94 112 577 922

Email: info@frontwalker.com

9. Opsio (Opsio Cloud)

Opsio is a Swedish multi-cloud managed services firm that modernizes legacy systems by re‑architecting workloads for cloud platforms and building production-ready data and AI pipelines. The company applies infrastructure automation and platform engineering to reduce operational friction when moving monolithic applications into containerized or cloud-native architectures.

Opsio blends a Nordic headquarters with an offshore delivery footprint to run continuous operations and SLA-backed support while accelerating technical debt remediation and platform modernization. Its delivery approach emphasizes infrastructure-as-code, observability, and governance to shorten migration waves and stabilize modernized estates.

Key Highlights

• AWS Advanced Consulting Partner, AWS MAP Partner, Microsoft Partner and Google Cloud Partner.
• More than 50 certified cloud engineers, 100+ certifications, and 3,000+ projects delivered.
• Founded in 2022.
• Publishes a 99.9% uptime SLA and lists ISO 27001, GDPR, NIS2 and NIST alignment as compliance commitments.

Services

• Cloud Migration
• Managed Cloud Services
• DevOps & Automation
• Managed AI & Data

Contact Information

Website: opsiocloud.com

Phone: +46 10 252 55 20

Email: info@opsio.se

Address: Tynäsgatan 12, 652 16 Karlstad, Sweden

10. CGI Sverige

CGI Sverige delivers end-to-end IT and business process services across Sweden, using application services, system integration, cloud and hybrid infrastructure, and enterprise platforms to modernize legacy systems. The firm combines global delivery capabilities with local Swedish teams to execute migrations, integrations, and managed operations while maintaining business continuity.

Their delivery approach pairs local offices and industry-focused teams with application modernization patterns and cloud-ready platforms to rehost, refactor, or replace aging systems without interrupting core operations. This blend of application services, system integration, and managed IT operations positions the company for large-scale legacy system modernization efforts.

Key Highlights

• Founded in 1976 and marked its 50-year milestone in 2026.
• Maintains a network of local offices across Sweden, including Stockholm, Gothenburg and Malmö.
• Publishes and supports proprietary solutions listed on the site, including Heroma, Raindance, Treserva and TWIN360.
• Serves multiple industry sectors on the Swedish site, including banking and finance, public sector, healthcare, transport and energy.

Services

• Business consulting
• System integration
• Application services
• Cloud & hybrid IT

Contact Information

Website: www.cgi.com

Phone: +46 (8) 670 20 00

Address: Franzéngatan 6, Stockholm 112 51, Sweden

11. Develit AB

Develit AB is a Stockholm-based IT company that builds custom business systems and mobile and web applications while managing projects from concept through production. The firm combines cloud-enabled development, AI-enhanced workflows, and ongoing IT operations to support modernization and long-term system reliability.

For legacy system modernization Develit migrates and refactors existing functionality toward cloud-capable architectures, integrates automation and predictive AI where it adds value, and provides the operational support needed to keep modernized systems stable in production.

Key Highlights

• Partners shown on the site include Amazon Web Services and Dell.
• Publicly displayed platform and tooling expertise includes Kubernetes, Red Hat and Cloudflare.
• The Development page reports 14 active projects, delivery across 16 countries, and an 80-person team.
• Develit states that its own IT systems are processed within the EU/EEA and that external processors are governed by data processing agreements.

Services

• System Development
• Mobile & Web Apps
• IT Operations & Support
• AI Solutions

Contact Information

Website: develit.se

Phone: 08-128 608 19

Email: sales@develit.se

Address: Lindhagensgatan 76, 112 18 Stockholm

12. Consid

Consid is a Nordic technology consultancy that converts aging enterprise IT into modular, API-first platforms by combining engineering, design, and product thinking. Their approach emphasizes iterative delivery with cross-functional squads that layer modern integration, automation, and AI capabilities onto existing systems to improve maintainability and scalability.

The firm pairs product-minded teams with platform engineering and cloud tooling to migrate monolithic systems toward service-oriented, cloud-ready architectures. This blended delivery model makes Consid a fit for legacy system modernisation projects that require both technical rework and sustained operational handover.

Key Highlights

• Founded in 2000, Consid now reports more than 25 years of experience in digital transformation.
• The company employs over 1,800 experts across more than 40 offices and operates in Sweden, Norway, Denmark, Finland, Germany and Poland.
• Consid Studio is the company’s model for taking digital ideas to scalable products with measurable value.
• The firm explicitly offers technical debt assessments and develops technical roadmaps to guide legacy modernisation efforts.

Services

• Legacy system modernisation
• Cloud, security & IT architecture
• Low-code & no-code solutions
• User experience (UX) and UI design

Contact Information

Website: www.consid.com

Phone: +46 73-350 88 70

Email: peter.hellgren@consid.se

Conclusion

Decide first by matching partner experience to your project scale, regulatory complexity, legacy codebase, and cloud strategy. SoftPro is the featured international partner on this list and is recommended for mid‑market and enterprise projects that require phased replatforming.

Prioritize vendors that align with your delivery preferences and operational needs. Choose teams with specific language‑migration experience when you must translate legacy code. Favor consultancies that use iterative, low‑risk delivery when continuous production availability matters. Select managed‑services providers when ongoing cloud operations or data pipelines are a priority, and pick firms with regulated‑industry experience for banking or insurance projects.