Leading Legacy System Modernization Companies in Hungary

Hungarian organizations often face legacy systems that drive high maintenance costs, slow new feature delivery, and create security and compliance risks. Buyers should compare migration strategy and architecture redesign, cloud and DevOps competencies, data migration and integration capabilities, security and GDPR compliance, project governance and delivery timelines, total cost of ownership, and plans for post-migration support and knowledge transfer.

SoftPro is the featured international partner leading this list and serves buyers in Hungary as an international partner. Compare SoftPro’s technical approach, delivery model, and demonstrated modernization experience against the other firms to align scope, budget, and timeline expectations.

1. SoftPro

SoftPro is the featured international partner on this list for readers evaluating legacy system modernization options in Hungary. The company takes on projects for startups, small and medium enterprises, and corporate teams that require codebase modernization, CMS migration, and long-term platform evolution. Engagements are delivered from its Warsaw, Poland headquarters into the Hungarian market and the wider EU region.

SoftPro's engineering foundation centers on Microsoft technologies, with expertise in .NET, ASP.NET Core and C#, and operational experience deploying solutions to Microsoft Azure. The team applies enterprise CMS migration practices and modern architecture patterns to transform legacy systems, supporting cloud migration paths, containerization and sustained production delivery to stabilize modernized platforms.

Key Highlights

• Over 20 years of combined team experience across enterprise and product projects.
• Front-end and full-stack work with React and to modernize user interfaces and integrations.
• AI capabilities that include LLM integration, retrieval-augmented generation (RAG) architectures and machine learning model support.
• Documented case portfolio featuring business portals, CRM/HRM systems, SaaS ETL platforms and community or gamification projects.

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. ULX (ULX Kft.)

ULX Kft. is a Hungarian open-source enterprise IT firm that works with large organizations to modernize legacy applications and infrastructure. The company applies cloud-native patterns, containerization, and lifecycle automation to redesign or replace monolithic systems and prepare them for on-premise or cloud operations.

ULX couples platform engineering with long-term operational support to move aging systems onto standardized, auditable platforms that enable continuous delivery. Their delivery approach emphasizes repeatable DevOps practices and automated application lifecycles to reduce migration risk and shorten time to production.

Key Highlights

• Designated partners of Red Hat and EnterpriseDB, building solutions around those vendor technologies.
• Official Red Hat and EnterpriseDB training and exam center operated by ULX.
• Announced regional designation as a Red Hat Specialized Partner on 2026-02-25.
• Public training and exam contact available via the company training phone and email channels for course registration and certification.

Services

• Enterprise application modernization
• DevOps & cloudscale platform engineering
• SQL & NoSQL database migration and scaling

Contact Information

Website: ulx.hu

Phone: +36 1 450 0921

Email: training@ulx.hu

3. United Consult Zrt.

United Consult Zrt. is a Hungary-based IT firm delivering cross-industry solutions for telecommunications, finance, healthcare, and energy. The company modernizes legacy environments through system integration, data warehouse and BI work, bespoke software development, and quality engineering to convert aging systems into data-ready, operational platforms.

Projects are executed using modern technologies and agile methodologies with an emphasis on long-term maintainability and smooth operational handover. United Consult combines consultancy, implementation, and testing capabilities to migrate monolithic applications toward modular, data-driven architectures.

Key Highlights

• Founded in 1999, giving the firm more than 25 years of presence in the Hungarian IT market.
• Employs over 300 IT professionals across consulting, engineering, and delivery roles.
• Works with Salesforce and is currently engaged in a Salesforce expansion project with Hungary.
• Participated in the 2026 Databricks Partner Masterclass as a Databricks integrator.

Services

• Big Data
• CRM Solutions
• Software Development
• Quality Engineering

Contact Information

Website: united-consult.hu

Phone: +36 20 273 3809

Email: info@united-consult.hu

Address: 1117 Budapest, Dombóvári út 26.

4. BerényiSoft Kft.

BerényiSoft Kft. modernizes legacy systems for Hungarian enterprises by rewriting outdated applications, migrating platforms to the cloud, and updating interfaces to modern web technologies. Their modernization work emphasizes careful data migration with no data loss and continuous operation and support after deployment.

They combine enterprise software engineering with AI-enabled automation to convert manual workflows into integrated services and improve operational efficiency. Projects are delivered by dedicated development teams that build web, mobile, and integration solutions tailored to existing business processes.

Key Highlights

• 20+ years of software development experience.
• 100+ successful projects completed.
• Integrates with large language models and assistants including ChatGPT, Claude, and Gemini.
• Reference clients shown on the site include Samsung SDI and DHL.

Services

• AI Call Center
• Iratmester
• MikroMenedzser

Contact Information

Website: berenyisoft.com

Phone: +36 21 2000 797

Email: office@berenyisoft.com

Address: 2724 Újlengyel, Petőfi Sándor utca 48

5. BlackBelt Technology Kft.

BlackBelt Technology Kft. modernizes legacy systems by combining low-code platforms with embedded development and system-engineering practices to accelerate migrations, integrations, and production deployments. The company emphasizes rapid prototyping and production-ready automation driven by its in-house JUDO framework to shorten modernization cycles and produce working proofs of concept.

Their delivery approach pairs engineering disciplines like DevOps and system engineering with pragmatic product-minded development to modernize back-office and embedded systems while preserving existing business logic. This technical-first posture makes them a fit for organizations seeking faster modernization using low-code for front-end workflows and engineered components for complex integrations.

Key Highlights

• The company lists a team of 180+ professional developers on its website.
• BlackBelt names finance, health, manufacturing, retail & logistics, public sector, startups, and telecom among its main industries.
• The site shows prominent client relationships and logos including Bosch, Ericsson, Erste Bank, and KPMG.
• The website documents participation in EU tenders and programs, including ELITE PROGRAM 2019 and multiple GINOP grants.

Services

• Nearshoring
• IT Staff Augmentation
• Team extension
• Development project management

Contact Information

Website: blackbelt.hu

Phone: +36 1 611 0462

Email: info@blackbelt.hu

Address: Residence 2, 16 Ganz Street, 3rd floor, 1027 Budapest, Hungary

6. MIKRUM (MIKRUM Informatikai Kft.)

MIKRUM Informatikai Kft. is a Budapest-based software development firm that modernizes legacy enterprise applications and builds industrial digital solutions for manufacturers and other large organizations. The company executes migrations and re-architecting projects that keep operational continuity while updating outdated systems to modern architectures.

MIKRUM follows a stepwise modernization framework—rehost, replatform, refactor, or retire—and applies concrete technologies in delivery, including containerization with Docker, API Gateway and message-queue integration patterns, and serverless functions such as AWS Lambda when appropriate. They deliver through custom development engagements and team augmentation to integrate legacy systems into cloud-native environments.

Key Highlights

• Founded in 2013, with early company development documented from 2013–2015.
• Uses a named rapid-delivery approach called “Berries” to accelerate custom software projects.
• Operates with roughly 60 employees and reports about 420 years of combined professional experience.
• Began international expansion from 2023 and maintains an office in Oldenzaal, Netherlands.

Services

• Custom software development
• Legacy application modernization
• Cloud migration and optimization
• Team augmentation

Contact Information

Website: mikrum.hu

Phone: +36 1 490 0910

Email: info@mikrum.hu

Address: Záhony utca 7, Graphisoft Park M épület, 1031 Budapest, Hungary

Address: Retentieweg 24, 7572 PH Oldenzaal, Netherlands

LinkedIn: linkedin.com/company/mikrum/

7. R-Szoft Ltd. (R-Szoft Kft.)

R-Szoft Kft. is a Budapest-based software development company founded in 2018 that modernizes legacy enterprise systems by combining experienced development teams with AI-driven techniques. Their agile teams integrate intelligent components into existing architectures to preserve business logic while updating system performance, security, and user experience.

They accelerate migrations through AI-assisted analysis and phased delivery to minimize operational downtime during modernization. The company focuses on secure, enterprise-ready integrations that fit corporate deployment constraints and long-term maintenance needs.

Key Highlights

• R-Szoft offers on-premise and hybrid deployment options for enterprise AI agents.
• They build Hungarian-language generative AI solutions that integrate state-of-the-art language models for corporate use.
• The development team averages more than 10 years of software development experience.
• Their product lineup includes a ChatGPT alternative, Gemini, and a Copilot replacement that several large domestic companies use.

Services

• Generative AI development
• Custom software development
• AI consulting

Contact Information

Website: r-szoft.hu

Email: office@r-szoft.hu

Phone: +36 30 181 2087

Address: Hungária Malomudvar, 1095 Budapest, Soroksári út 48. 8. épület 2. emelet

8. 4DSoft Kft.

4DSoft Kft. is a Budapest-based software house that delivers end-to-end enterprise digital solutions, covering user analysis, customer-journey planning, UI design, development, verification and deployment. The company highlights software quality and information security as part of its delivery approach for large-scale business systems.

The firm’s sector experience spans telecommunications, logistics, energy and service industries, and its workflow-management capabilities support integration-heavy projects. These delivery features and industry focus align with the technical and compliance demands commonly encountered in legacy system modernization work.

Key Highlights

• Agile team of 50+ experts that span the entire digital product lifecycle.
• The company cites 35 years of large-enterprise experience on its site.
• Received an AAA financial stability certification from Dun & Bradstreet.
• Member of a Horizon 2020 / EUROSTARS consortium that secured collaborative R&D funding.

Services

• Custom software development
• Mobile application development
• Workflow management
• UX and customer-journey design

Contact Information

Website: 4dsoft.hu

Phone: +36-1-455-8880

Email: info@4dsoft.hu

Address: 1096 Budapest, Telepy utca 24. 2. emelet.

9. Shareline Ltd.

ShareLine Zrt. develops custom enterprise software, AI-driven document management, and IT system integration for Hungarian and international clients. They specialize in Microsoft .NET and SharePoint-based applications and apply Azure and hybrid-cloud patterns with a security-first approach to modernize legacy systems.

Their delivery model pairs application lifecycle management with system integration to migrate, refactor, and extend legacy enterprise applications while preserving business logic. With more than 15 years of experience in regulated sectors such as banking, ShareLine uses cross-functional teams to support on-premises, cloud, and hybrid deployments and to reduce operational risk during modernization.

Key Highlights

• Delivered an integrated commerce and services platform for MediaMarkt that connected MediaMarkt, Vodafone, Aegon, MBH Bank, Linistry and Scrive.
• Operates roughly 40 developers and completes about 40–50 projects annually.
• Frontend and platform technologies explicitly listed include Angular, React and React Native; other stack items include Java, Node.js, Oracle, UiPath and SonarQube, and digital-signature integrations with Microsec, Netlock and DocuSign.
• The company is part of the Inovivo Group holding.

Services

• Digital transformation
• Custom software development
• Application lifecycle management (ALM)
• IT system integration

Contact Information

Website: shareline.hu

Phone: +36 1 791 8331

Email: info@shareline.hu

Address: MOM Park Office Building, Building A, II., 1123 Budapest, Alkotás utca 53.

10. Atoll Technologies PLC

Atoll Technologies PLC develops SAMU, a super-flexible web-based enterprise architecture repository that visualizes complex landscapes and acts as the planning backbone for transformation initiatives. That capability makes SAMU a practical tool for legacy system modernization because it lets teams model current estates, reveal dependencies, and design staged migration plans.

Alongside SAMU, Atoll delivers bespoke software projects for clients in banking, insurance, and telecommunications, pairing architecture modelling with hands-on implementation. This combination of an EA repository plus custom development supports modernization programs that need both governance and code-level delivery.

Key Highlights

• Established in 2001 and owned entirely by the company management since 2009.
• SAMU and Treasury Backbone are listed as trademarks of Atoll Technologies PLC in the company legal statement.
• Published client projects and case studies include work for Omantel and an online insurance contracting system for BNP Paribas Cardif, showing deliveries in telecommunications and insurance.
• The corporate form changed to Atoll Technologies PLC (joint-stock company) effective September 1, 2022.

Services

• Bespoke software development
• SAMU SaaS (enterprise architecture repository)
• Banking and insurance software solutions

Contact Information

Website: atollgroup.eu

Address (HQ): Capital Square Office Building, 7th floor, Váci út 76., 1133 Budapest, Hungary

Address (Atoll Americas): 1775 Eye Street NW, Suite 1150, Washington, DC 20006, USA

11. Proximate (proximate.dev)

Proximate is a Budapest-based firm that modernizes legacy enterprise systems by reimagining customer journeys and migrating core workloads to cloud-native architectures. The company emphasizes API-first redesigns that move monolithic and SOA-era platforms toward microservice-driven landscapes to improve operational flow and reduce technical debt.

Their approach centers on practical modernization outcomes that accelerate time to market through architecture replacement and process automation. Proximate positions these technical transformations as part of broader digital transformation work aimed at restoring speed and agility to legacy-dependent organizations.

Key Highlights

• Registered as Proximate-dev Kft. with VAT number HU32051658.
• Maintains an in-house AI platform that the site describes as powering search engines and developer tools to shorten software delivery time.
• Cites extensive sector experience in banking, insurance, e-commerce and government.
• States it can deliver custom software projects either as fixed-scope engagements or using agile delivery models.

Services

• Custom software development
• System integration
• Mobile application development
• Consultancy

Contact Information

Website: proximate.dev

Email: info@proximate.dev

Address: 1037 Budapest, Kocsis Sándor út 6. A.ép. C. Lház.

12. Evonit Consulting

Evonit Consulting helps organizations modernize legacy enterprise systems by replacing brittle middleware and automating B2B data flows to increase reliability and operational visibility for logistics, automotive, and finance customers.

They deliver migrations and integrations using a cloud-first integration platform and hosted migration services that connect older ERPs and on-prem systems to modern cloud applications and containerized deployments.

Key Highlights

• MayaConnect is described on the company site as a cloud-native integration platform built on over 25 years of experience.
• The System Integration page states the team includes over 20 developers focused on integration and custom development.
• Evonit explicitly lists supported EDI message formats including EDIFACT, ANSI X12, VDA, FORTRAS and SAP IDOC.
• Customer success stories and technical pages show use of enterprise integration technologies such as Apache Camel, Apache Kafka, Spring-based Java backends, Docker containerization, Apache ActiveMQ and Jenkins CI/CD.

Services

• System Integration
• EDI Services
• Software Development
• Integration Platform (MayaConnect)

Contact Information

Website: evonit.eu

Phone: +36 70 328 5391

Email: info@evonit.eu

Address: Hungary, 6500 Baja, Árpád tér 1, 2nd Floor, Office 211

13. Epsilons Solutions Hungary Kft.

Epsilon Solutions Hungary Kft. blends engineering and software expertise to modernize operational workflows by designing automation hardware, rapid prototypes, and the digital control layers that operate them. The company pairs physical system design with bespoke software to help clients run and scale complex production and logistics processes.

They enable phased modernization by building custom middleware and integration layers that connect on‑premise control systems and legacy business applications to cloud platforms and AI services, allowing stepwise migration while preserving day‑to‑day operations. The firm emphasizes iterative delivery, documentation, and post‑launch support to keep modernized systems stable as they evolve.

Key Highlights

• Founded in 2015 and operating across multiple international markets.
• Maintains a global supplier and sourcing network spanning Europe, the US, India, China, and Southeast Asia.
• Commits to client IP: projects are NDA-friendly and clients retain 100% ownership of source code.
• Provides dedicated post-launch maintenance and assigns a committed project manager for delivery and support.

Services

• Custom Software Development
• Enterprise IT Solutions
• R&D & Product Development
• Component Sourcing

Contact Information

Website: epsilons.solutions

Phone: +36 304 705 125

Address: 2161 Csomád, Szent István u. 48., Budapest, Hungary

14. Alzamo IT Services & Consulting

Alzamo is a Budapest-based IT consulting firm that transforms, enhances, and operates business applications and processes for life sciences, banking and insurance, and telecommunications clients. The company helps organizations modernize legacy systems and digitalize processes to reduce operational risk and accelerate time to market.

Its delivery model emphasizes quick onboarding, flexible engagement options, and integration as an extension of client teams in similar time zones. That nearshore approach supports iterative modernization projects and ongoing application operations without disrupting daily business.

Key Highlights

• Supports enterprise OCE platforms for Pharma & Life Sciences including Veeva, Microsoft Dynamics, and Salesforce.
• In Banking & Insurance engagements the firm works with Oracle, Temenos, Salesforce, and Microsoft technologies.
• Offers application lifecycle management and test automation services tailored to modernization and digitalization projects.
• Publishes case studies and lists active hires including a Senior Functional Lead for Veeva CRM & Commercial Operations, demonstrating hands-on project capacity.

Services

• Change & Release Management
• System Configuration
• Business Administration
• Strategy Consulting

Contact Information

Website: alzamo.com

Phone: +36 20 22 22 333

Address: Regus First Site, 1053 Budapest, Kossuth Lajos u. 7-9., Hungary

15. Frontx

FrontX is a Budapest-based senior IT consultancy serving large financial institutions including insurers, banks, and leasing companies. The firm pairs business analysis and senior engineering to turn regulatory and process constraints into maintainable software solutions.

For legacy and core-system challenges they embed experienced analysts, architects, and engineers into client teams to accelerate delivery and reduce operational risk. Their delivery emphasizes agile coordination, continuous support, and end-to-end product development within financial-sector contexts.

Key Highlights

• 50+ successful projects listed on the company site.
• 98% client satisfaction figure presented on the homepage.
• 12+ years of experience in the financial sector noted by the firm.
• Core cloud-native technologies called out: Azure, Kubernetes, Docker.

Services

• Digitalization consultancy
• Legacy modernization and support
• IT team extension and contracting
• Cloud migration and DevOps

Contact Information

Website: frontx.hu

Phone: +36 20 938 2448

Email: info@frontx.hu

Address: 1147 Budapest Jávorka Ádám utca 56.

16. Kodesage Ltd.

Kodesage Ltd. builds an AI-powered platform that extracts and keeps engineering knowledge up to date from codebases, documentation, databases, and ticketing systems to accelerate understanding and modernization of legacy applications. The platform surfaces visual dependency maps and natural-language answers so teams can diagnose system behavior and plan changes more quickly.

The product is designed to run in secure enterprise environments, including on-premise deployments, and automates audit-ready documentation to reduce senior-engineer interruptions and shorten developer ramp-up for complex modernization projects.

Key Highlights

• Their Oracle Forms migration engine claims customers can go live three times faster at half the cost.
• Kodesage emerged as a spin-off after internal LLM research and states its team has been modernizing legacy software since 2006.
• The originating engineering organization grew to over 300 engineers across eight offices in four countries and reports more than 200 customer projects.
• Public customer stories on the site feature HOLD Asset Management and NETIC as examples.

Services

• Legacy Modernization
• Documentation Platform
• Developer Ramp-up

Contact Information

Website: kodesage.ai

Address (Hungary): Lövőház utca 39 1024 Budapest

Address (United Kingdom): 7 Bell Yard, London England, WC2A 2JR

Conclusion

SoftPro is the featured international partner on this list for readers evaluating legacy system modernization options in Hungary.

When choosing a provider, align the vendor’s technical approach with your project scope and regulatory needs and prioritize firms with relevant industry experience for complex or regulated environments. Decide whether you need cloud-native and container strategies, full rewrites, API-first redesigns, low-code acceleration, AI-assisted code understanding, or embedded and automation expertise, and select a partner whose methods match your timeline and budget. Also weigh capabilities for planning and long-term governance, such as architecture repositories, middleware automation, and operational handover, to reduce transformation risk.