According to 2025 study, 62% of enterprises still run on legacy software, even though modern technologies evolve. These outdated platforms slow innovation, create security risks, and absorb huge IT resources instead of adding business value. The pressure to update legacy software grows fast switching from a long-term plan to an urgent business requirement. The urgency, in its turn, has changed the conversation from whether to modernize to who can be trusted to do it right.
So if you are looking for a reliable legacy modernization partner in 2026, with a vast expertise in modern tech stack and focus on measurable business impact, explore the list below.
Corsac Technologies
Corsac Technologies has been transforming legacy systems into modern, agile platforms for over 18 years. As one of the leading providers of software modernization services, Corsac experts focus on the root causes of tech stagnation, not just code retouch, which makes them especially valuable to enterprise-level customers. Corsac’s team takes ownership of the entire modernization process, with each change documented, reversible, and compliant with industry requirements. Upon release, their experts provide post-migration support and transfer knowledge to your in-house team for independent future maintenance.
Accenture
Accenture is one of the leading companies in enterprise software modernization that rovide strategy, cloud migration, and application reengineering services. Accenture works with customers in over 20 industries including Government, healthcare, and banking. They handle complex, large-scale products helping clients accelerate legacy systems transformation and maintain business continuity.
DXC Technology
DXC Technologyoffers end-to-end modernization services for legacy IT systems. Their team transforms legacy systems worldwide in sectors like aerospace and defense, energy, finance, retail, and more with the power of AI. DXC experts in consulting, engineering, and technology combine technical skills with practical business insights to drive measurable results and help enterprises move forward with scalable and easy-to-maintain applications.
Onix
Onix is an IT development company that rescues legacy software for businesses from startups to large enterprises by moving outdated systems to cloud-native solutions. They provide legacy migration, code refactoring, architecture redesign, and DevOps optimization, and use AI‑driven tools to automate modernization. Onix supports seamless transitions without data loss and with minimum downtime.
Andersen
Andersen is a large international software development and modernization company whose expertise is acknowledged by enterprise giants such as TUI, Samsung, and Mercedes-Benz. Their legacy software modernization services include consulting, API harmonization, Refactoring, and Migration to engineer advanced software in customers in Finance, Healthcare, Media&Entertainment, and more. Andersen balances the technical expertise of their team with business priorities to deliver reliable and scalable solutions aligned with the enterprise’s objectives.
Innowise
Innowise helps enterprises modernize legacy applications through IT audit, system migration, software re‑engineering, API integration, and cloud migration. Their team removes the barriers of legacy systems such as old vendor dependencies, overhead maintenance costs, trapped data, and inefficient workflows through modern bespoke solutions. As a reliable modernization partner, Innowise takes ownership of the full modernization process – from legacy system audit to post-release support.
Devox Software
Devox software is a full-cycle enterprise IT software modernization company that creates future-ready architectures powered by modern tech. As a legacy app modernization vendor, Devox proudly introduced their AI Solution Accelerator™ to reduce development time without compromising quality to help business avoid downtimes. Their experts fix issues of outdated software such as security vulnerabilities, vendor dependencies, and complex workflows by implementing, Web3, IoT, and more.
Wrapping up, in 2026 legacy systems modernization for enterprises goes beyond technical decision and becomes a must-do investment. Companies from this list offer different approaches to modernizing legacy stack. What unites them is the experience in working with enterprise-systems, expertise in modern stack and focus on delivering measurable results. Each legacy modernization partner mentioned above helps not only refresh the code but to keep business continuity and data security so you won’t make the wrong choice when picking one.