Home / Mobile app development
We design, build and support mobile applications across the complete product lifecycle. Our engineers develop native iOS and Android apps where platform-specific performance matters, and use React Native or Flutter when a shared codebase offers the right balance of speed, cost and user experience.
Our engineers work across the Apple and Android ecosystems using Swift, Kotlin, Java and established cross-platform frameworks.
We can build a new application from the ground up or take responsibility for an existing product with users, technical debt and an active release schedule.
We build iOS and Android applications that take full advantage of each platform. Native development is well suited to products that depend on advanced device capabilities, high-performance interfaces, background processes or platform-specific user experiences.
We use React Native or Flutter when a shared codebase can reduce development time and cost without compromising the product experience. We also support Ionic and Xamarin applications that are already in production.
Native or cross-platform: how to chooseWe assess existing mobile products, improve their architecture and performance, update legacy technologies and prepare them for current operating systems. The recommended approach may involve targeted refactoring, framework migration or a selective rebuild.
Our QA engineers test functionality against business requirements and across the required device and operating-system matrix. The process covers regression testing, edge cases, performance and the release conditions that affect real users.
We support applications after launch through operating-system updates, dependency upgrades, crash investigation, performance monitoring and App Store and Google Play releases.
Experienced mobile engineers can join your internal team on a full-time or part-time basis. They work within your repository, engineering process and release workflow, with an engagement model that can adjust as the roadmap changes.
Most mobile engagements begin with one of these six situations.
The product concept is defined and you need a team to take it from initial validation through design, development and store release.
The work
The product requires a refreshed interface, improved performance, new functionality or support for current versions of iOS and Android.
The work
The roadmap is growing faster than the current team can deliver, or a specific platform skill is missing internally.
The work
You want to reach iOS and Android users efficiently and need an informed decision on whether cross-platform development is appropriate.
The work
You need a delivery structure that can move between full product ownership, a dedicated team and targeted engineering support.
The work
You want experienced engineers at a lower delivery cost than equivalent Western European teams, without reducing technical standards or product ownership.
The work
The delivery process is consistent across native and cross-platform applications.
We define the target users, core workflows, platforms, integrations and release priorities. This stage produces a written scope, delivery roadmap, timeline and estimate.
Deliverables: product scope, estimate and delivery roadmapWe design the key screens and interaction flows, then prepare an interactive prototype that stakeholders and users can review before development begins.
Typical tools: Figma and LottieEngineers deliver the application in two-week iterations against the agreed priorities. Testable builds are shared regularly so feedback can be incorporated while the product is still evolving.
Typical technologies: Swift, Kotlin, React Native and FlutterWe test across the agreed device matrix, complete regression and performance checks and add crash monitoring. The release candidate is validated on real devices before store submission.
Typical tools: TestFlight, Firebase and SonarQubeWe prepare the store listings, manage submission and respond to review requirements. After launch, the team monitors stability, user feedback and product performance to plan the next release.
Platforms: Apple App Store and Google PlayYou do not need to fit the project into a fixed delivery model. We can take a new application from concept to release, add experienced engineers to your existing team, modernise a product already in the stores or assume responsibility from a previous provider.
We manage the complete path from discovery and product design to development, testing and store release. Before the first sprint, you receive a written scope, delivery roadmap and estimate, with a clear definition of what belongs in the initial release.
Our engineers join your repository, ceremonies and release process to increase delivery capacity or cover a skill gap. You interview the developers before they start and retain direct control over priorities.
Staff augmentationWe begin with a technical assessment, then recommend the smallest set of changes required to improve performance, maintainability and platform support. The work may involve focused refactoring, an architecture update or a framework migration such as Java to Kotlin or Ionic to React Native.
We structure the knowledge transfer, assess the codebase and release process, then assume responsibility for development, maintenance and store releases. For Photoweb we did the whole app migration from Java to Kotlin.
The Photoweb MigrationOur mobile engineers use coding agents to accelerate implementation, testing, refactoring and documentation. This reduces the time between an approved design and a build stakeholders can use, while senior engineers remain accountable for architecture, security, performance and release quality.
AI-native product developmentCoding agents help prepare interface components, API clients and test foundations. Product teams can review complete user flows sooner, identify issues earlier and make decisions before changes become expensive.
During a takeover or modernisation, coding agents help map the codebase, identify missing tests and document existing behaviour. Engineers gain a reliable view of the application before making changes that could affect users or releases.
Architecture, offline behaviour, data synchronisation, security and performance remain engineering decisions. Every AI-assisted change is reviewed and tested by an experienced mobile engineer before it enters a release build.
We choose technologies based on product requirements, the existing architecture and the cost of maintaining the application over time. Our teams cover modern native and cross-platform development as well as the legacy technologies commonly found in established mobile products.
We use Swift and SwiftUI for new development and support UIKit and Objective-C where established applications still depend on them. The same team can manage signing, provisioning, TestFlight and the complete App Store review process.
We build modern Android applications with Kotlin and Jetpack Compose and maintain Java-based products that need continued development or gradual migration.
React Native and Flutter are our primary cross-platform frameworks. We also support Ionic and Xamarin applications already in production and add native modules where the shared framework cannot meet a specific performance or device requirement.
We integrate with existing platforms or build the services required to support the mobile product, using technologies that fit your architecture and current cloud environment.
We automate builds and releases, monitor code quality and track application stability across test and production environments.
Our teams work with the services commonly required by mobile products, including design systems, localisation, notifications, real-time communication, payments and on-device machine learning.
Some clients need one partner to own the entire application. Others already have product and engineering leadership but need additional mobile expertise. We structure the engagement around the ownership you want to keep internally, then adjust it as the roadmap and team evolve.
ImproveIT takes responsibility for discovery, UI and UX design, engineering, quality assurance, store release and post-launch support. You work with one delivery team and one agreed plan from product definition through launch.
Best for founders and business units without an established mobile engineering function.
A stable, full-time team works exclusively on your product. You participate in team selection, set product priorities and communicate directly with the engineers, while ImproveIT provides the capacity required to execute a sustained roadmap.
Best for products with several months of planned development and a need for predictable, long-term capacity.
Dedicated development teamsOne or more mobile engineers join your internal team to increase throughput or provide expertise that is difficult to justify as a permanent hire. Capacity can be full-time or part-time and can change as the backlog develops.
Best for delivery peaks, temporary capacity gaps and specialist skills required for part of the roadmap.
We migrate an existing application to a new framework, architecture or infrastructure while preserving critical functionality and release continuity. The engagement begins with a technical assessment and migration plan, then continues through implementation, testing, store release and ongoing support.
Best for applications limited by outdated technology, rising maintenance costs or infrastructure that no longer supports the product roadmap.
A release date marks the beginning of a mobile product's commercial life. Stability, conversion and the ability to ship improvements determine whether it continues to grow. Piiics came to us with applications already available in both stores and a crash rate that was affecting user acquisition. We prioritised reliability, then continued improving the product experience.
Mobile app rebuildPiiics, 2018 - 2022
Read the Piiics case studycrash-free users on both stores, within a year
higher conversion rate, two years in
These projects represent three common delivery scenarios: rebuilding an established mobile portfolio, moving an MVP into production and migrating a product to a more suitable framework.
Mobile team augmentationPhotoweb
crash-free rate once our team owned the apps
France's first online photo-printing service needed to rebuild and modernise several mobile applications without interrupting active releases.
Read the Photoweb case studyOn mobile, across the engineers we put on your app
Typical saving against Western European rates, same seniority
Longest we take to put a mobile engineer on your project
Countries where the apps we have built are in use
“I have worked with ImproveIT for more than 3 years, as a mobile product manager for Photoweb and now as a director of Piiics. In both, the technical challenge is quite high. The dev team has been highly motivated and professional.”
Clement PoursacPhotoweb Group · France
“Great app that works with functionality exactly like we want it. Internal stakeholders are particularly impressed with the quality of deliverables. They take ownership beyond their contractual obligations.”
Alok AlstromBeyond Liberum AB · Sweden
“Developers are experienced. They can discover the main potential issues and are able to solve them beforehand.”
Romain CoiraultLalalab · France
“Their attention to detail is great, and they question us if they think it might be better to solve the issue in a different way. They really care about the product they are building.”
Michael KolomenkinEyeToAi · Israel
The right choice depends on the product, not the framework preference. Cross-platform development is usually more efficient for applications built around interfaces, forms and API-driven workflows that need to launch on both iOS and Android. Native development is typically the better option when the product relies on advanced camera functionality, Bluetooth, background location, complex graphics, platform-specific hardware or highly responsive interactions. We assess the technical requirements, commercial priorities and long-term roadmap before recommending either approach.
The timeline depends on the release scope, number of platforms, integrations and store requirements. During discovery, we define the first commercially viable release and map the milestones required to deliver it. You receive testable builds throughout development, allowing stakeholders to review complete user flows and make product decisions before store submission.
The cost is shaped by the release scope, design complexity, platform strategy, integrations and quality requirements. After discovery, we provide a written estimate and separate the functionality required for the first release from features that can be delivered in later iterations. This provides a realistic initial budget without limiting the longer-term product roadmap.
You retain ownership of the source code, technical documentation and application assets produced during the engagement. Apple App Store and Google Play accounts can remain under your organisation’s control from the beginning of the project.
Yes. Our team prepares the release builds, store listings, privacy declarations and technical information required for submission. We also respond to review feedback, implement necessary changes and manage resubmission where required.
Yes. We begin with a technical review of the existing codebase, dependencies, release pipeline and store configuration. Based on the findings, we determine which components can be retained, which require refactoring and which should be rebuilt. The work is planned in stages to maintain release continuity and minimise disruption for existing users.
Post-launch support can include continued product development, operating-system and dependency updates, crash investigation, performance monitoring and store release management. The engagement can range from part-time engineering support to a complete mobile product team, depending on the release schedule and roadmap.
The initial consultation focuses on the product objective, current technical foundation, target platforms and next release milestone. Based on this context, we will recommend an appropriate delivery model and prepare a preliminary scope, timeline and estimate.
If a smaller first release, additional discovery or a different platform strategy would reduce cost or delivery risk, we will make that clear before the project begins.
We sign an NDA before discussing your idea in detail. We reply within 24 hours.
CP
AA
RC
MK