7 Best Companies for Software Support & Optimization
Legacy software, despite common belief, does not always need a full rewrite. In many cases, the right partner can improve the system gradually, keep core business logic in place, and make the platform easier to scale, support, and develop further.
If you’re looking to upgrade your existing system without a full rewrite, explore this list. We selected the 7 best companies that help businesses modernize, optimize, and support legacy systems. All with a practical approach and dozens of completed projects with proven business value across domains.
Corsac
Corsac is a software modernization provider for breaking the tech stagnation of legacy software. The company transforms ageing platforms into modern, scalable platforms for customers across sectors. Corsac combines end-to-end modernization services with a tailored approach and tech skills in both legacy (.NET Framework, Xamarin, React Native, etc.) and modern stacks to upgrade smoothly, without major revamps. With Corsac, your software remains familiar to your users while operating on new, modern code. The company operates in highly regulated industries, ensuring compliance and security paired with measurable business outcomes.
Refactorly.App
Refactorly is an AI-powered engineering platform for legacy transformation without turning modernization into a high-risk rewrite. The system relies on a Retrieval-Augmented Generation architecture with a coordinated Multi-Agent Swarm to analyze existing systems and generate modernized code. Refactorly.App supports controlled deployment without downtime. AI agents deeply inspect the system, create a phased roadmap, and generate code, while the final decision-making power rests with human engineers. With Refactorly, software support and modernization become a transparent process with clear estimation of time and resources needed.
Boldare
Boldare is a digital product and transformation company with over 20 years of experience in optimizing legacy software. The company treats modernization as an ongoing discipline rather than a single, high-risk rewrite. Their experience spans the full transformation lifecycle – from early-stage discovery to legacy system overhauls. Their experts embed AI throughout the process – from UX design and code generation to API optimization and predictive scaling, which positions them as a reliable partner for intelligent modernization at scale.
DevCom
Devcom is a full-cycle software development company with over 25 years of engineering excellence. The company prioritizes secure, scalable platform delivery with consistent quality across healthcare, finance, logistics, manufacturing, and nonprofit organizations. Devcom’s expertise includes predictive analytics, natural language processing, cloud architecture, SaaS integration, and data engineering to create long-term impact across industries.
DevOx Software
DevOx software provides legacy system modernization and optimization services, including technical audits, code refactoring, and architectural migration services. The company relies on AI tools to accelerate the delivery of full-cycle modernization services. DevOx primarily serves small to medium-sized businesses in fintech, fleet management, and SaaS. The company’s values are continuous improvement and common sense. They perform a thorough audit to detect system bottlenecks and modernize what is holding your system back, not do “just another” revamp.
Taazaa
Taazaa is an Ohio-based company that serves hundreds of clients, from startups to SMBs and Fortune 500 companies, primarily in healthcare and enterprise markets. Their goal is to deliver innovative and progressive digital solutions step-by-step to avoid bing-bang risky migrations. Taazaa’s developers combine agile delivery methods with a strong emphasis on UI/UX design for both legacy application modernization and from-scratch development.
MTechZilla
MTech Zillia is a custom software development company that works with businesses of all sizes in Europe and the USA. The company has experts in QA, product management, design, and more to build new digital products and improve existing systems. Their focus is on legacy applications modernization, cloud migration, and breaking large monolithic systems into more flexible architectures. MTechZilla delivers software that is easier to maintain, scale, and better suited to the way each business operates.
To sum up, legacy software support and optimization protect the value your system already has while making it ready for what comes next. The companies listed above offer different approaches to modernization to match the needs of each customer. The right choice depends on your system, your business goals, your budget, and the level of change your team is ready for.
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