Angular Development Services | Agilie

Java development services

Agilie helps businesses keep, migrate, and extend Java-based Android products that are viable for long-term business operations.
Java development services

Strategic value of Java for Android

Java roots in Android, where it matters most, including legacy code and SDK dependencies and mixed projects
Support for existing Android apps

Support for existing Android apps

Android apps crafted before Kotlin’s rise still run on Java, and their codebases demand continuous support and low-risk modernization.
Working with legacy code

Working with legacy code

Rewriting a Java codebase is costly and challenging, while keeping and gradually modernizing it will be a smarter and safer decision.
Kotlin-based projects

Kotlin-based projects

Java can exist with Kotlin codebases, allowing developers to use both languages, minimizing the need to start everything from scratch.
Support for Java-based SDKs

Support for Java-based SDKs

Java-based SDKs and libraries are widespread, which makes this programming language straightforward for direct integration.

Java in action

From fintech to legacy apps, Java proves its worth wherever stability, security, and uninterrupted operation are

Java in action
Legacy Android appss

Legacy Android appss

Apps developed years ago on Java still power real businesses, yet they rely on ongoing updates and careful modernization.

Cross-platform JVM projects

Cross-platform JVM projects

Projects that share code across Android and server-side Java environments rely on Java as the common language to avoid duplication and keep a single source of truth.

Regulated industries with Java-certified components

Regulated industries with Java-certified components

Some compliance frameworks and audited environments mandate specific Java-certified libraries or tooling, leaving no room for language substitution.

Java-based SDK dependencies

Java-based SDK dependencies

Some third-party SDKs and libraries are written exclusively in Java, making it the only practical integration path without risking compatibility issues.

Hardware & IoT integrations

Hardware & IoT integrations

Devices and embedded systems that communicate via Java-based protocols or APIs require Java on the mobile side to keep uninterrupted communication.

Application with long development history

Application with long development history

Long-standing products built on tightly coupled Java code demand careful refactoring, so as to preserve continuity without disrupting what works.

Our Java expertise

From legacy support to full-scale migrations, our Java work spans the complexity that real Android applications demand.

Working with large codebases

We navigate extensive, tightly coupled Java codebases, auditing structure, reducing complexity, and making sure changes are deliberate and risk-free.

Migrations: Java - Kotlin

Our team handles Java-to-Kotlin migrations in structured phases, saving functionality, minimizing disruption, and keeping the application stable throughout the transition.

Support for legacy Android apps

Agilie maintains and supports legacy Android apps built on Java, fixing issues, optimizing performance, and extending functionality without breaking existing behavior.

Integrating new features into the existing project

We integrate new functionalities into established Java products carefully, ensuring new and existing code coexists without introducing regressions or instability.

Our Java-related projects

Here are two products where Java was the right call, and where the decisions made around it contributed to the business.
Home Safety Solution

Home Safety Solution

Java supported consistent communication between the mobile app and smart home sensor hardware. It enabled custom device connection logic, including SDK-independent Wi-Fi integration, real-time processing of sensor data spanning smoke, temperature, motion, and immediate notification delivery to users.
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The Wholesale B2B Marketplace

The Wholesale B2B Marketplace

Java underpinned the original Android app, supporting complex marketplace operations, including catalog navigation, media-heavy listings, and real-time user activity. As the product evolved, the Java codebase provided the stable base needed for a gradual Kotlin migration, supporting uninterrupted feature delivery.
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When modernization is needed

Left unmodernized, Java projects grow harder to maintain, slower to evolve, and costly to keep effectively functioning.

When modernization is needed
Extensive Java codebase

Extensive Java codebase

Modernization becomes a thorough solution when the Java codebase grows extensively to be managed effectively, improving durable scalability and high-quality performance.

Limited Kotlin adoption

Limited Kotlin adoption

A Java-only approach misses Kotlin’s conciseness, null safety, and Android-focused capabilities, slowing down the overall feature delivery.

Maintenance complexity

Maintenance complexity

Old-fashioned Java codebases become harder to maintain over time, so modernization is an effective solution to bring clarity back to development.

Slow new features delivery

Slow new features delivery

A modernized stack can restore speed and development efficiency when Java architecture lags behind, preventing feature development bottlenecks.

Technical debt

Technical debt

When technical debt piles up in Java projects, progress stalls and risks grow, so modernization is a decent solution to lead to the most reliable fix.

Java - Kotlin migration

Migrating from Java to Kotlin removes the bottlenecks that slow teams down, creates less boilerplate and crashes, presenting a codebase that’s easier to keep and extend.
1

Auditing the codebase and planning migration phases

The team reviews the existing Java codebase, identifies problem areas, sets migration priorities, and defines clear milestones to keep the process structured on track.
2

Prioritizing isolated and lower-risk modules

Self-contained, lower-risk modules go first, which builds confidence, validates the approach, and reduces the chance of disrupting core business logic early in the process.
3

Incremental migration, keeping Kotlin-Java coexistence

The migration moves module by module with Java and Kotlin running side by side on the JVM, keeping the app functional throughout and avoiding the risks of full rewrites.
4

Testing each piece before moving to the next

Every migrated module is tested and validated before the team proceeds further, catching issues early and ensuring the product stays stable at each transition point.

Business value (mobile-focused)

Migration pays off where it counts in mobile app development: leaner maintenance, faster delivery, and a more stable performance for the end users.

Business value (mobile-focused)

Saving existing investments

Gradual modernization keeps functional code intact, allowing teams to develop further on what already works, instead of starting from scratch.

Reduced risks during updates

Structured and phased transitions minimize the probability of regressions and breakdowns during updates, which improves release predictability.

Business value (mobile-focused)
Business value (mobile-focused)
Business value (mobile-focused)

Faster development

Teams can deliver new features faster without compromising code quality due to concise syntax and modern tooling, which reduces development cycles.

Simplified maintenance

A Kotlin-modernized codebase is easier to read and update,  reducing the time and effort required for further mobile application maintenance.

When NOT to use Java

Java remains essential for the legacy code. Nevertheless, when it comes to new projects and MVPs, Kotlin’s speed, safety, and modern alignment are what take the strategic lead.
Case 01
When NOT to use Java

New Android projects

With modern apps following a Kotlin-first direction, the language sits at the core of APIs, official samples, and learning resources. The alignment eases the adoption of new tooling and best practices, while Kotlin’s reduced boilerplate helps lowering crash risks.
Case 02
When NOT to use Java

MVP development

Kotlin delivers more conciseness compared to Java. This Android language requires fewer lines of code, leading to reduced boilerplate and minimized repetitive patterns. For MVP, the dev team can build business logic, screens, and models faster.

Our foundational software development services

Agilie provides comprehensive digital product development, from initial strategy to final deployment of secure and business-aligned solutions.
Web development

Web development

Scale globally with compliant web solutions, including custom portals, eCommerce products, and self-service platforms.

Mobile development

Mobile development

Deliver mobile apps for any industry, from fintech to healthcare, for both customer-facing businesses and internal workflows.

AI development

AI development

Optimize customer interactions and business operations with AI assistants, smart automation, and scalable LLM systems.

UX/UI design

UX/UI design

Strengthen your brand identity with a fully-fledged UX/UI design from idea analysis to confirmed prototypes and tested user flows.

MVP development

MVP development

Reduce costly reworks by building a Minimum Viable Product that validates your idea and guides long-term tech decisions.

QA services

QA services

Secure your project with full-cycle testing and product support: from QA consulting to pre- and post-release inspections.

The web and mobile technologies we use

We use Java to build and maintain Android apps, integrating it with the following technologies to ensure stable delivery.

Modernize your Android app

Have an app that needs an audit, migration, or ongoing support? Share your project details, and we will map out the right plan.

16

Years on the market

200+

Happy clients

60+

Business experts

32M+

Lines of code

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FAQ

1

How can Java help extend the lifecycle of my existing Android app without a full rewrite?

FAQ
2

What challenges arise when keeping large Java codebases, and how can gradual modernization solve them?

FAQ
3

How does a hybrid Java and Kotlin approach enable faster feature delivery while keeping the product stable?

FAQ
4

Why is Java still a reliable choice for integrating SDKs and supporting complex Android ecosystems?

FAQ
5

What cooperation models does Agilie implement?

FAQ