Top Application Modernization Services
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Undisclosed$25 - $49 / hr50 - 249Zagreb, Croatia
Services provided
See all 13 projectsSerengeti is a versatile software development company specializing in staff augmentation, custom software development, and IT solutions. Reviews reflect high client satisfaction, with a focus on their competence in providing skilled developers and impressive response times. Over 90% of clients highlight their professionalism and integration capabilities, while some suggest further adoption of agile methodologies. Serengeti maintains a strong partnership with diverse sectors, delivering quality work and demonstrating flexibility in client engagement.
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$5,000+$25 - $49 / hr50 - 249Ahmedabad, India
Services provided
See all 11 projectsWappnet Systems Pvt. Ltd. is a versatile software development company specializing in building enterprise solutions, mobile applications, and AR/VR applications. The reviews are overwhelmingly positive, with 100% of clients praising their technical expertise, responsiveness, and effective project management. Clients commend their ability to adapt to specific requirements and emphasize their impressive dedication to communication and delivery timelines.
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$50,000+$25 - $49 / hr10 - 49Novi Sad, Serbia
Services provided
See all 6 projectsBDIT Engineering is a versatile software development company specializing in augmenting internal teams with skilled engineers for tasks such as web, iOS, and Android app development, as well as data engineering. Reviews consistently highlight their high-quality deliverables, effective communication, and ability to meet deadlines, with 100% of reviewers noting satisfaction and no areas for improvement mentioned. Their technical expertise and cost-effective solutions are widely praised.
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$25,000+$50 - $99 / hr10 - 49Wien, Austria
Services provided
See all 5 projectsRemSoft.Dev is a custom software development company with a strong focus on .NET and Angular technologies. The reviews indicate a high level of client satisfaction, with consistent praise for their reliability and professionalism. Approximately 100% of the reviews emphasize their effective project management and timely delivery. Clients also appreciate their technical expertise and adaptability to client needs, with no significant areas for improvement noted.
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$25,000+$25 - $49 / hr250 - 999Richardson, TX
Services provided
See all 17 projectsEleviant Tech is a technology solutions provider specializing in mobile app and web development, leveraging platforms like Microsoft Azure. The reviews consistently highlight their technical expertise, proactive problem-solving, and strong project management skills. Approximately 90% of the feedback is positive, with clients praising their responsiveness, adherence to deadlines, and collaborative approach. Notably, 70% of reviews emphasize their ability to integrate additional insights and adapt to project changes efficiently.
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$5,000+$25 - $49 / hr50 - 249Sofia, Bulgaria
Services provided
See all 13 projectsAionys is a company specializing in Enterprise App Modernization services, delivering solutions that enhance operational efficiency and safety in complex industries. Feedback is overwhelmingly positive, with 100% of reviewers highlighting their effective project management and ability to meet deadlines, ultimately achieving a seamless digital transformation for their clients.
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$25,000+$100 - $149 / hr10 - 49Barcelona, Spain
Services provided
See all 7 projectsSystemSeed is a digital solutions company specializing in web development, UX design, and learning management systems, often leveraging Drupal as a foundation. Their reviews reveal a consistent theme of strong project management, adaptability, and a proactive approach to understanding client needs. Approximately 90% of reviewers highlighted their effective communication and collaboration skills, while 80% noted their ability to align with client values and goals.
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$25,000+$50 - $99 / hr10 - 49Maroubra, Australia
Services provided
See all 8 projectsMadAppGang is a mobile app development company specializing in building robust and innovative applications for iOS, Android, and web platforms. They are praised for their adaptability and expertise, with 100% of reviewers highlighting their technical prowess and problem-solving capabilities. The feedback is overwhelmingly positive, with clients commending their project management and ability to deliver projects on time and within budget.
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$25,000+$50 - $99 / hr50 - 249Košice, Slovakia
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See all 4 projectsHOTOVO is a versatile software development company offering services such as custom web and mobile application development, QA testing, and DevOps support. With over 90% positive feedback, reviewers commend HOTOVO for their flexibility, timely delivery, and ability to match resources to project needs. However, there are suggestions for improved communication and more proactive technology recommendations.
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$10,000+$150 - $199 / hr10 - 49
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See all 1 projectsTwoConnect, LLC. is an IT services firm specializing in Azure integration and cloud migration, particularly with BizTalk. The feedback is overwhelmingly positive, with 100% of reviewers highlighting smooth communication and responsiveness. Clients, like Market Logistics Services Corporation, noted successful project outcomes and efficient workflows without any issues.
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$10,000+$50 - $99 / hr10 - 49Niš, Serbia
Services provided
See all 6 projectsNaissus Technologies is a versatile software development company specializing in .NET-based solutions, web applications, and custom software projects. Their reviews suggest a strong emphasis on agile project management, responsiveness, and client-focused delivery. The feedback is overwhelmingly positive, with about 90% of reviewers highlighting their effective communication and project management skills. Some suggestions for improvement include expanding their devops capabilities and enhancing their UI/UX design resources.
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$10,000+$50 - $99 / hr10 - 49Prague, Czech Republic
Services provided
See all 5 projectsSWEHQ is a versatile software development company specializing in custom web applications, UX/UI, and API services. Feedback is overwhelmingly positive, with 100% of reviewers praising their expertise, commitment, and open communication. Clients appreciate their problem-solving skills and adaptability, often highlighting their effective project management and ability to deliver high-quality, scalable solutions meeting specific industry needs.
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$10,000+$50 - $99 / hr10 - 49Łódź, Poland
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See all 11 projectsMakimo is a software development company specializing in custom app development and strategic technology consulting. Their reviews highlight their technical expertise in Python and Django, responsiveness, and strong project management skills. Impressively, over 90% of clients commend their effective communication and problem-solving capabilities, while around 80% appreciate their ability to adapt to evolving project needs and deliver on time.
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$25,000+$50 - $99 / hr10 - 49Kyiv, Ukraine
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See all 1 projectsNika Craft is a technical and UI development company recognized for its expertise in JavaScript, node.js, and UI improvements. Reviews highlight their flexibility, effective communication, and alignment with human values in business. While 100% of feedback praised their adaptability and technical skills, budget constraints limited their project potential. Overall, Nika Craft made a significant positive impact on client projects.
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$5,000+$50 - $99 / hr1,000 - 9,999Plainsboro Township, NJ
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See all 10 projectsDamco Solutions is a versatile IT services company specializing in Salesforce CRM implementations, mobile app development, and EHR integration. The company demonstrates professional expertise and adaptability, with positive feedback from 100% of clients. Notably, clients appreciate their patience, professionalism, and effective project management, although some suggest that additional resources could expedite projects.
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$25,000+$50 - $99 / hr50 - 249Buenos Aires, Argentina
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See all 4 projectsAdviting as a versatile IT consulting firm, Adviters offers services in software development, system improvement, and process digitalization. Reviews indicate a strong alignment with client values and a reputation for delivering high-quality work. While 75% of feedback highlights their timely delivery and effective communication, some reviewers mention the need for better documentation and resource selection.
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$25,000+$25 - $49 / hr50 - 249Warszawa, Poland
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See all 11 projectsClurgo is a software development company with a strong focus on Java-based solutions, offering services such as e-banking, CRM development, and custom software solutions. Reviews indicate high satisfaction with their technical expertise and adaptability, with approximately 90% of clients highlighting their strong communication, technical skills, and delivery on project requirements. While their focus on technical delivery is lauded, some feedback suggests room for better client representation and long-term developer retention.
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$1,000+$25 - $49 / hr10 - 49Kamianets'-podil's'kyi, Ukraine
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See all 2 projectsITPromotion LLC - Software Solutions is a versatile software development company offering services in website and mobile application development. The reviews highlight an overall positive experience, with 100% of clients noting timely project delivery and effective communication. Clients appreciate their professionalism and direct team access, although there were minor concerns about the competence of some developers in specific cases.
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$25,000+$150 - $199 / hr10 - 49New York, NY
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See all 14 projectsDef Method is a versatile software development company specializing in creating customized web and mobile applications using technologies like Ruby on Rails. Feedback highlights their strong project management skills, with 100% of reviewers praising their communication and responsiveness. About 86% of reviews emphasize their ability to understand clients' business needs and provide strategic guidance, while 14% suggested improvements such as clearer upfront expectations. Overall, Def Method is highly recommended for their technical expertise and customer service.
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$5,000+$25 - $49 / hr50 - 249
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See all 8 projectsWebSenor is a web development and digital marketing company offering services like website development, mobile app development, and digital marketing, including SEO and social media marketing. Their clients report positive experiences overall, with 80% praising their professionalism, timely delivery, and technical expertise. While communication and project management tools are noted as areas for improvement, clients value their dedication and adaptability in overcoming technical challenges.
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$5,000+< $25 / hr10 - 49
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See all 15 projectsDevathon is a software development company specializing in creating custom web and mobile applications. The reviews reveal that 100% of clients appreciate their technical expertise and adaptability, with 75% emphasizing their strong project management skills. The company's ability to deliver high-quality, innovative solutions, even under tight timelines, is frequently highlighted. While some clients noted room for improvement in communication and process definition, the overall feedback is overwhelmingly positive.
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$25,000+$50 - $99 / hr50 - 249Lukavica, Bosnia and Herzegovina
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See all 6 projectsSingularity is an IT modernization company specializing in Enterprise Application Modernization and software platform update services. The reviews indicate a high level of client satisfaction, with 100% positive feedback highlighting their ability to enhance platforms, implement new features, and improve security. Reviewers commend Singularity for timely delivery and their ability to provide necessary skills.
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$5,000+$100 - $149 / hr10 - 49Plymouth, MN
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See all 5 projectsCirrius Solutions is a strategic consulting firm specializing in Salesforce implementation and CRM solutions. Reviews highlight their flexibility, professional project management, and ability to integrate seamlessly with client teams. Approximately 90% of feedback emphasizes their strategic consultancy and adaptability. Clients appreciate their proactive communication, strong leadership, and the ability to handle complex projects, while maintaining a focus on continuous improvement and achieving client goals.
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$50,000+$200 - $300 / hr10 - 49New York, NY
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See all 6 projectsLightmatter is a versatile technology company specializing in product development, web design, and UX/UI design. With an 80% positive feedback rate, clients consistently praise their expertise, flexibility, and project management skills. About 70% of reviewers highlight their ability to meet deadlines efficiently, while 60% appreciate their depth of engagement and transparency. Lightmatter is commended for its comprehensive approach and ability to adapt to diverse industry needs.
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$10,000+$25 - $49 / hr10 - 49İSTANBUL, Türkiye
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See all 8 projectsAPPTECH SYSTEMS is a company specializing in Enterprise Application Modernization and digital transformation services. Reviews highlight their exceptional dedication to customer service, adaptability, and affordability, with a 100% positive feedback rate. Clients appreciate their expertise in systems integration, process automation, and providing outstanding UX/UI design services, reflecting a proactive approach and commitment to customer satisfaction.
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$25,000+Undisclosed250 - 999Podgorica, Montenegro
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See all 2 projectsHaulmont Technology is a software development firm specializing in creating bespoke solutions, such as custom print service applications for Java web environments. Reviews highlight their expertise in Java libraries and commend their efficient communication and timely delivery. The feedback is overwhelmingly positive, with 100% of reviewers expressing satisfaction and noting no areas for improvement.
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$100,000+$100 - $149 / hr50 - 249Lehi, UT
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See all 14 projectsKahoa, formerly known as SolutionStream, is a versatile software development company offering services such as digital transformation, mobile app development, and custom software solutions. Feedback from reviews highlights their effective project management, attention to detail, and capacity to deliver projects on time and within budget, with approximately 90% emphasizing their professionalism and expertise. Overall, clients express satisfaction with their technical skills and proactive communication.
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$10,000+$50 - $99 / hr50 - 249New York, NY
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See all 44 projectsJetSoftPro is a versatile software development company specializing in providing scalable solutions across multiple domains, including web and mobile development, AI, and payment solutions. The company receives predominantly positive feedback, with clients praising their proactive approach, effective communication, and ability to integrate seamlessly into existing teams. Approximately 100% of reviews highlight their responsiveness and professional collaboration, with no notable criticisms or areas for improvement frequently mentioned.
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$25,000+$150 - $199 / hr10 - 49Atlanta, GA
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See all 8 projectsBlueFletch is a highly regarded software development company that specializes in mobile application development and IT consulting services. They are particularly praised for their expertise in Android development, project management, and ability to handle complex projects. Across their reviews, clients highlight their professionalism, technical skills, and effective communication. Approximately 90% of the feedback is positive, with many clients impressed by their project management and problem-solving capabilities. However, a few reviews note areas for improvement in paperwork and QA testing consistency.
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$5,000+$50 - $99 / hr50 - 249Paris, France
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See all 5 projectscode.store is a versatile development company specializing in CMS migrations, digital platform creation, and mobile app development. Reviewers frequently commend their flexibility, responsiveness, and effective project management. Approximately 80% of reviews highlight their adaptability and ability to meet expectations, while 70% mention their strong communication and project management skills. However, some reviews suggest improvements in documentation and visibility on bug resolution timelines.
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List of the Top 15 Legacy Modernization Services
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$25,000+$50 - $99 / hr250 - 999Miami, FL
Ability to deliver
35.8/40.020/20 Reviews10/10 Clients & Experience5.8/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
$50,000+$50 - $99 / hr1,000 - 9,999New York, NY
Ability to deliver
37.8/40.020/20 Reviews10/10 Clients & Experience7.8/10 Market PresenceService focus
15% Enterprise App Modernization85% Other -
$100,000+$50 - $99 / hr250 - 999Miami, FL
Ability to deliver
34.9/40.019.2/20 Reviews10/10 Clients & Experience5.7/10 Market PresenceService focus
25% Enterprise App Modernization75% Other -
$10,000+$25 - $49 / hr1,000 - 9,999Southborough, MA
Ability to deliver
32.1/40.016.6/20 Reviews10/10 Clients & Experience5.5/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
UndisclosedUndisclosed1,000 - 9,999Atlanta, GA
Ability to deliver
34/40.018.8/20 Reviews10/10 Clients & Experience5.2/10 Market PresenceService focus
20% Enterprise App Modernization80% Other -
$50,000+$50 - $99 / hr250 - 999Wrocław, Poland
Ability to deliver
31.6/40.015.8/20 Reviews10/10 Clients & Experience5.8/10 Market PresenceService focus
40% Enterprise App Modernization60% Other -
$5,000+$50 - $99 / hr10 - 49Brno, Czech Republic
Ability to deliver
31.3/40.017.8/20 Reviews9.8/10 Clients & Experience3.7/10 Market PresenceService focus
60% Enterprise App Modernization40% Other -
$5,000+< $25 / hr1,000 - 9,999
Ability to deliver
30.9/40.016.4/20 Reviews10/10 Clients & Experience4.5/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
$10,000+$50 - $99 / hr250 - 999Sacramento, CA
Ability to deliver
30.8/40.016.4/20 Reviews10/10 Clients & Experience4.5/10 Market PresenceService focus
80% Enterprise App Modernization20% Other -
$100,000+$50 - $99 / hr1,000 - 9,999Oakland, CA
Ability to deliver
30.5/40.015.2/20 Reviews8.8/10 Clients & Experience6.6/10 Market PresenceService focus
45% Enterprise App Modernization55% Other -
$10,000+$50 - $99 / hr50 - 249București, Romania
Ability to deliver
33.3/40.019.6/20 Reviews10/10 Clients & Experience3.7/10 Market PresenceService focus
35% Enterprise App Modernization65% Other -
$100,000+$150 - $199 / hr50 - 249Southborough, MA
Ability to deliver
30.1/40.015.8/20 Reviews10/10 Clients & Experience4.3/10 Market PresenceService focus
50% Enterprise App Modernization50% Other -
$10,000+$25 - $49 / hr250 - 999Beijing, China
Ability to deliver
35.4/40.019.6/20 Reviews9.1/10 Clients & Experience6.7/10 Market PresenceService focus
15% Enterprise App Modernization85% Other -
$25,000+$25 - $49 / hr50 - 249Agoura Hills, CA
Ability to deliver
35.9/40.020/20 Reviews10/10 Clients & Experience5.9/10 Market PresenceService focus
20% Enterprise App Modernization80% Other -
$25,000+$25 - $49 / hr1,000 - 9,999Orlando, FL
Ability to deliver
35.6/40.020/20 Reviews10/10 Clients & Experience5.6/10 Market PresenceService focus
10% Enterprise App Modernization90% Other -
$10,000+$50 - $99 / hr250 - 999Hudson, OH
Ability to deliver
33.5/40.017.2/20 Reviews9.8/10 Clients & Experience6.5/10 Market PresenceService focus
20% Enterprise App Modernization80% Other -
$1,000+< $25 / hr250 - 999Hanoi, Vietnam
Ability to deliver
34.8/40.017/20 Reviews9.7/10 Clients & Experience8/10 Market PresenceService focus
15% Enterprise App Modernization85% Other -
$25,000+$150 - $199 / hr50 - 249Claymont, DE
Ability to deliver
33.3/40.016.6/20 Reviews10/10 Clients & Experience6.7/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
$25,000+$25 - $49 / hr50 - 249L'viv, Ukraine
Ability to deliver
37.2/40.020/20 Reviews10/10 Clients & Experience7.2/10 Market PresenceService focus
10% Enterprise App Modernization90% Other -
$50,000+$50 - $99 / hr1,000 - 9,999Kraków, Poland
Ability to deliver
35.2/40.019/20 Reviews10/10 Clients & Experience6.2/10 Market PresenceService focus
10% Enterprise App Modernization90% Other -
$50,000+$50 - $99 / hr1,000 - 9,999Atlanta, GA
Ability to deliver
32.3/40.016.8/20 Reviews10/10 Clients & Experience5.5/10 Market PresenceService focus
15% Enterprise App Modernization85% Other -
$50,000+$50 - $99 / hr50 - 249Gliwice, Poland
Ability to deliver
34/40.017.8/20 Reviews10/10 Clients & Experience6.2/10 Market PresenceService focus
20% Enterprise App Modernization80% Other -
$5,000+$50 - $99 / hr250 - 999London, England
Ability to deliver
31.6/40.016.6/20 Reviews10/10 Clients & Experience5/10 Market PresenceService focus
20% Enterprise App Modernization80% Other -
$10,000+$150 - $199 / hr10 - 49Littleton, CO
Ability to deliver
31.8/40.017.6/20 Reviews10/10 Clients & Experience4.2/10 Market PresenceService focus
35% Enterprise App Modernization65% Other -
$50,000+$100 - $149 / hr10 - 49Costa Mesa, CA
Ability to deliver
32.6/40.018.6/20 Reviews10/10 Clients & Experience4/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
$50,000+$50 - $99 / hr50 - 249Miami, FL
Ability to deliver
31.5/40.017.2/20 Reviews10/10 Clients & Experience4.3/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
$25,000+$25 - $49 / hr1,000 - 9,999São Paulo, Brazil
Ability to deliver
33.4/40.016.6/20 Reviews9.9/10 Clients & Experience7/10 Market PresenceService focus
10% Enterprise App Modernization90% Other -
$10,000+$50 - $99 / hr50 - 249Warszawa, Poland
Ability to deliver
31.4/40.016.4/20 Reviews10/10 Clients & Experience5/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
$50,000+$100 - $149 / hr250 - 999London, England
Ability to deliver
28.2/40.016.2/20 Reviews7.8/10 Clients & Experience4.2/10 Market PresenceService focus
30% Enterprise App Modernization70% Other -
$25,000+$25 - $49 / hr250 - 999Kropyvnytskyi, Ukraine
Ability to deliver
34.2/40.018.8/20 Reviews10/10 Clients & Experience5.4/10 Market PresenceService focus
10% Enterprise App Modernization90% Other
Top App Modernization Agencies
App modernization companies upgrade, refactor, or re-platform legacy software so it performs like a modern, cloud-ready application. They begin by auditing the existing codebase, infrastructure, and business requirements, then create a roadmap that might include re-architecting monolithic apps into microservices, containerizing workloads, or migrating databases to scalable cloud environments. Their end goal is to improve performance, security, and maintainability while minimizing downtime.
Most firms deliver a mix of strategic and technical services, such as:
- Legacy code assessment and technical debt analysis
- Re-platforming (e.g., on-prem to AWS, Azure, or GCP)
- Code refactoring and re-architecting into microservices
- API enablement and containerization (Docker, Kubernetes)
- UI/UX refresh and mobile optimization
- Data migration, cleansing, and database modernization
- Ongoing maintenance, DevOps, and cloud cost optimization
Pricing varies widely depending on project scope, complexity, and the tech stack involved. Clutch data shows most engagements range from $50,000 to $500,000 overall, with hourly rates between $75 and $200. Lighter projects like a UI facelift or limited refactoring tend to fall near the lower end, while full re-architectures involving cloud migration, data overhaul, and strict compliance can exceed $1 million. Always request a detailed proposal that outlines costs for discovery, development, testing, and support.
When choosing the best right app modernization for your business, consider these:
- Review expertise: Look for case studies that mirror your tech stack (Java, .NET, PHP) and industry compliance needs.
- Check client feedback: Verified Clutch reviews reveal how the team communicates, hits deadlines, and handles setbacks.
- Evaluate methodology: A strong partner will propose a phased approach that includes assessment, pilot, and rollout stages, each with clear success metrics.
- Validate certifications: Cloud partnerships (AWS, Microsoft, Google) signal deep platform knowledge.
- Assess cultural fit: Long projects require easy communication, mutual trust, and shared time zones or overlap.
These are some of the red flags that you should watch for when hiring an app modernization company:
- Guaranteed timelines before an audit: Accurate estimates require a code and infrastructure review.
- Lack of documentation: If they won’t commit to architecture diagrams, test plans, or knowledge transfer, future maintenance may suffer.
- One-size-fits-all solutions: Forcing every project onto a single cloud or framework can indicate limited expertise.
- Poor security practices: Outdated OWASP knowledge or no DevSecOps pipeline is a deal-breaker for critical systems.
- Minimal client references: A reputable firm should readily provide recent, relevant references.
Here are some questions you can ask app modernization companies before hiring them:
- Which modernization strategies (rehost, refactor, re-architect) do you recommend for our stack, and why?
- Can you share success metrics from similar projects—e.g., performance gains or cost reductions?
- What is your approach to minimizing downtime during migration?
- How will you ensure code quality and security (tooling, peer reviews, automated testing)?
- What support and knowledge-transfer do you provide after launch?
- How do you handle scope changes and unforeseen legacy issues?
Partnering with specialists accelerates time-to-value. Experienced teams bring proven frameworks, automation toolchains, and cloud partnerships that help reduce risk and shorten migration windows. Businesses often benefit from faster performance, lower maintenance costs, improved security compliance, and easier feature releases, all without overburdening internal teams.
A freelancer may handle small refactoring tasks cost-effectively but often lacks the resources for large-scale audits, DevOps, and 24/7 support. Agencies provide multidisciplinary teams including architects, developers, QA specialists, DevOps engineers, and project managers who can deliver end-to-end transformations with enterprise-grade SLAs.