When an app becomes slow, unstable, crash-prone, or difficult to maintain, performance recovery requires more than fixing isolated bugs. The companies below work with existing applications through performance audits, code and architecture improvements, testing, modernization, technical troubleshooting, and post-launch support. The list covers teams suited to different recovery situations, from legacy mobile apps and stalled projects to performance bottlenecks and backend scalability problems.
Gilzor focuses directly on recovering and improving existing mobile applications. Its work includes mobile app performance audits, code and architecture reviews, QA testing, crash and freeze resolution, technical troubleshooting, and post-production support. The company can assess App Store and Google Play performance alongside technical state, runtime risks, dependencies, architecture, and release processes.
Gilzor also works with iOS, Android, and cross-platform applications and can address problems such as recurring bugs, slow performance, unstable releases, and technical debt. Its Mobile App Audit produces a prioritized recovery roadmap with effort ranges and dependencies, making the service relevant when a team needs to understand what is actually holding an application back before committing to a larger refactor or rebuild.
GeekyAnts provides dedicated mobile performance audits and optimization services covering application startup, memory, rendering, threads, state cycles, and UI responsiveness. Its engineers profile apps under real-world conditions, identify bottlenecks, apply targeted fixes, and validate the results against performance benchmarks.
The company works with React Native, Flutter, native iOS and Android development, and related technologies such as Swift, Kotlin, Firebase, Sentry, and Datadog. Its mobile engineering services also include maintenance, OS updates, dependency upgrades, offline-first architecture, and long-term support. This makes GeekyAnts relevant when performance problems are connected to broader application architecture rather than a single isolated defect.
Itexus combines mobile development with project rescue and software recovery services. Its project rescue process starts with planning and architecture review, followed by manual and automated testing, performance testing, and CI/CD improvements. The company can either provide an audit for an existing team to implement or take responsibility for the recovery and subsequent development itself.
For mobile products, Itexus works across iOS, Android, and cross-platform applications. Its technical scope includes resource consumption, CPU and memory usage, backend scalability, APIs, cloud infrastructure, load balancing, security, and post-development support. This makes the company relevant to applications where performance issues are tied to both the mobile client and supporting systems.
A-listware works on mobile applications through development, testing, modernization, integration, and post-launch support. Its mobile services cover native iOS and Android applications, cross-platform products, progressive web apps, wearables, and embedded software.
Performance recovery can include functional and performance testing, code refactoring, architectural redesign, application evolution, and performance management. The company also handles backend integrations and cloud architecture, which is useful when slow application behavior is partly caused by APIs, infrastructure, or legacy systems behind the mobile interface.
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Mobilesoft handles both mobile app recovery and ongoing performance work. Its services include code and architecture audits, performance optimization, security reviews, technical debt assessment, rescue and refactoring, and maintenance. For older applications that no longer build or have been removed from an app store, the company also offers a separate app reactivation process.
Its mobile development work covers native iOS and Android applications as well as Flutter. The team uses tools including Sentry and Crashlytics for monitoring and supports releases, testing, integrations, and post-launch improvements. The recovery model is particularly relevant when an existing application needs to be brought back into a maintainable, releasable state rather than rebuilt immediately.
Scalo approaches mobile performance through software engineering, QA, testing, and technical consulting. Its mobile optimization work addresses startup time, responsiveness, crashes, memory consumption, battery use, network latency, application size, and backend performance.
The company also works with code optimization, resource management, network performance, UI responsiveness, real-device testing, automated testing, and post-release monitoring. Its technology coverage includes Android, iOS, Kotlin, and Xamarin. This broader engineering scope is useful for applications where performance degradation involves both the mobile code and the services supporting it.
OSKI Solutions works on application performance through profiling, caching, load testing, and architecture improvements. Its software engineering services include stabilizing legacy codebases, optimizing applications as traffic and data volumes increase, and improving APIs and high-volume synchronization services.
For mobile products, OSKI works with native Android development using Kotlin and Jetpack Compose as well as cross-platform technologies such as .NET MAUI and React Native. Its performance testing services cover load, stress, soak, spike, and scalability testing, with reported testing at 300 requests per second and more than eight hours of soak testing.
Netguru works with mobile applications across development, maintenance, performance testing, and modernization. Its mobile performance work covers load time, response time, memory, battery, network usage, stability, and responsiveness. The company also uses real-device testing and performance monitoring to identify issues that may not appear in simulated environments.
A published Keto-Mojo engagement involved stabilizing a legacy React Native app with performance problems and declining store ratings. Netguru worked on performance optimization, bug fixes, Bluetooth synchronization, and UX improvements before developing native replacement applications.
Bacancy Technology provides mobile application maintenance with a dedicated performance optimization component. Its services cover performance analysis, bottleneck identification, application upgrades, monitoring, bug fixing, and security management.
The company also describes recovery work involving code audits, memory leak identification, API optimization, lazy loading, caching, and cloud scalability. Its broader engineering services cover mobile applications, modernization, cloud, DevOps, and product engineering, allowing performance work to extend beyond the mobile client when backend or infrastructure problems contribute to slow or unstable behavior.
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Net Devs focuses on enterprise software engineering, legacy modernization, architecture, cloud infrastructure, testing, and code refactoring. For an application suffering from performance or stability problems, its work can include auditing an existing codebase, identifying risk areas, improving architecture, strengthening testing, and modernizing legacy components without requiring a complete rewrite.
The company works across .NET, JVM, Node, Python, and Go and supports Azure, AWS, and Google Cloud environments. Its enterprise engineering process includes automated and manual QA, CI/CD, observability, and ongoing production iteration.
SyanSoft Technologies works on performance optimization across mobile and web applications. Its approach can cover application code, APIs, databases, backend services, and third-party integrations. Performance audits can lead into code refactoring, asset compression, database query tuning, backend optimization, load testing, and real-time monitoring.
The company also works with native iOS and Android applications and cross-platform development, alongside cloud, DevOps, CI/CD, and infrastructure services. This combination is relevant when application performance problems extend from the interface into APIs, data retrieval, or backend infrastructure.
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SoftPro supports application performance through custom software development, backend engineering, cloud development, modernization, and ongoing support. For mobile products, the company can work on the systems behind the application, including APIs, data flow, cloud infrastructure, and backend scalability.
Its technology coverage includes .NET, ASP.NET Core, C#, React, Azure, and other Microsoft-oriented technologies. SoftPro also provides web application maintenance with bug fixes, performance improvements, monitoring, and updates. This makes the company relevant when an app's visible performance problems originate partly from backend architecture or cloud infrastructure.
Pixact Technologies develops high-performance iOS and Android applications and works specifically with mobile performance issues such as memory usage, GPU load, frame-rate stability, stuttering, ANR errors, and memory leaks. Its performance work is tied to mobile engineering rather than only general software optimization.
The company also has experience with applications across areas such as healthcare and on-demand services. Its Atlanta-based team provides mobile development for startups and businesses, making it relevant to products that need both application engineering and performance-focused technical work.
Mobian is a European software development studio focused on mobile and AI solutions. Its mobile services cover iOS, Android, and Flutter development, along with backend engineering, QA, performance optimization, maintenance, and post-launch support. The company also works with existing products that need scaling, technical improvements, or ongoing engineering support.
Mobian's post-launch services include performance monitoring, bug fixes, updates, and scale planning. Its mobile development work also uses analytics and monitoring tools such as Crashlytics and New Relic, which can help identify crashes, performance issues, and other problems affecting an application's production behavior.
AppMatic Tech provides project rescue and mobile application engineering for inherited or stalled software projects. Its rescue work covers iOS, Android, and web codebases, including stabilization, technical debt reduction, and moving projects toward a shippable release.
The company develops native iOS and Android applications using Swift and Kotlin, as well as Flutter applications. Its broader mobile service includes technical scoping, UI/UX, backend API development, QA, device testing, app store submission, and post-launch support. This combination is relevant when recovery requires both fixing an existing codebase and continuing development after stabilization.
21Century.Tech is an AI-native software studio that supports existing software through refactoring, testing, documentation, architecture work, and production engineering. Its delivery model pairs senior engineers with AI-assisted code generation, testing, documentation, and large-scale refactoring, while human engineers retain responsibility for architecture and code review.
For application recovery, this model can fit projects where the main requirement is to clean up an existing codebase, strengthen testing, improve documentation, or move a product toward production without starting from zero. The company also supports third-party integrations, CI/CD, and production deployment.
App performance recovery can involve much more than fixing a few slow screens or recurring crashes. Depending on the condition of the product, businesses may need performance profiling, code refactoring, architecture improvements, testing, backend optimization, modernization, or ongoing technical support. The companies in this list cover different parts of that recovery process, from dedicated mobile performance optimization to broader software rescue and legacy modernization.
When comparing app performance recovery companies, consider the specific source of your application's problems, the technologies involved, the level of technical debt, and whether you need a one-time audit or continued engineering support. A company with experience in your application's platform and performance challenges can help turn an unstable or outdated product into a more maintainable and reliable application.
