Gilles Crofils

Gilles Crofils

Hands-On Chief Technology Officer

Based in Western Europe, I'm a tech enthusiast with a track record of successfully leading digital projects for both local and global companies.1974 Birth.
1984 Delved into coding.
1999 Failed my First Startup in Science Popularization.
2010 Co-founded an IT Services Company in Paris/Beijing.
2017 Led a Transformation Plan for SwitchUp in Berlin.
May 2025 Eager to Build the Next Milestone Together with You.

Harnessing Kotlin for Cross-Platform Apps

Abstract:

Kotlin has emerged as a powerful tool for developers looking to create seamless and efficient cross-platform applications. This language offers a pragmatic and concise coding experience, which significantly reduces the amount of boilerplate code developers must write, leading to cleaner and more readable codebases. Kotlin's interoperability with Java further enhances its attractiveness, allowing developers to use existing Java libraries and frameworks while benefiting from Kotlin's modern features. The focus of this article is to explore how Kotlin facilitates the development of applications that run flawlessly across multiple platforms, including Android and iOS, by leveraging shared codebases. This not only streamlines the development process but also ensures consistency in functionality and experience across different devices. For technology leaders seeking to optimize their teams' productivity and build versatile, high-quality applications, adopting Kotlin could be a strategic move towards achieving these goals efficiently.

Picture an abstract illustration that envisions the power and efficiency of a cross-platform programming language by leveraging shades of blue. Imagine the design incorporating symbolic elements like interconnected gears and bridges spanning distinct pieces of technology, paired with flowing lines linking emblematic images of a green robot and a fruit. Highlight the avoidance of redundant code through simplified, streamlined shapes. Subtly integrate signs of the language's ability to work with legacy programming libraries such as intertwining paths or spiral structures. Aim for the image to embody a contemporary, tech-oriented aesthetic connoting productivity, uniformity, and adaptability.

Introduction to Kotlin and its relevance in cross-platform development

Kotlin has rapidly become a significant player in cross-platform app development, offering developers a streamlined and efficient coding experience. Known for its ability to drastically reduce boilerplate code, Kotlin empowers developers to write concise and expressive code. One of Kotlin’s greatest strengths lies in minimizing repetitive tasks, allowing developers to focus on creating innovative solutions. This feature alone makes it a valuable tool in the tech world, where efficiency and productivity are key. With its growing popularity and robust capabilities, Kotlin is setting the stage for enhanced app development, making it a strategic choice for modern development teams.

Kotlin's interoperability with Java and its benefits

One of Kotlin's standout features is its seamless interoperability with Java, making it exceptionally valuable for developers. This interoperability enables developers to leverage the extensive library of existing Java frameworks and APIs, ensuring that legacy code and libraries can still be utilized. Essentially, Kotlin can call Java code and vice versa, creating a unified development environment.

This dual capability offers several critical benefits. Firstly, it eases the transition for teams who have substantial experience and investment in Java, as they can start integrating Kotlin incrementally. Secondly, it enhances the developer's toolkit by combining Kotlin’s modern syntax and features with Java’s mature ecosystem. Embracing Kotlin doesn’t mean letting go of the tried-and-tested resources Java provides, which includes robust tools, vast libraries, and active community support.

All these factors make Kotlin an attractive choice for those looking to update their skills or enhance their existing Java projects. By marrying Kotlin’s new-age features with Java’s established strengths, developers can enjoy a best-of-both-worlds scenario, ultimately boosting productivity and innovation.

Shared codebases: A key advantage for cross-platform apps

One of the standout features of Kotlin is its support for shared codebases, which brings notable benefits to cross-platform app development. When developers can create a single codebase for both Android and iOS applications, the development process becomes significantly more streamlined. This reduces the need to write and maintain two separate codebases, saving time and resources.

With a unified codebase, consistency across different devices is easier to achieve. Developers can ensure that both Android and iOS versions of the app offer the same functionality and user experience, which is crucial for user satisfaction. Additionally, this approach simplifies the debugging process, as fixing a bug in a shared codebase addresses the issue on all platforms simultaneously.

The ability to use shared codebases means that development teams can focus more on adding features and improving performance rather than duplicating efforts. This not only boosts productivity but also enhances the overall quality of the application. By leveraging Kotlin’s supportive environment, technology leaders can achieve faster time-to-market and create more cohesive and reliable cross-platform applications.

Practical use cases and success stories

Kotlin's impact can be seen through various practical use cases and success stories, demonstrating how effectively it powers cross-platform applications. One standout example is the popular dating app, Tinder. The Tinder team adopted Kotlin due to its expressive syntax and seamless Java integration, which has led to improved developer efficiency and fewer bugs. They have reported significant performance enhancements and a more manageable codebase.

Another success story is the productivity app Trello. Trello leveraged Kotlin's ability to share code between different platforms, allowing the team to write consistent and reusable code for both Android and iOS. This has resulted in a cohesive user experience across different devices and a more streamlined development process. The efficiency gains from utilizing a shared codebase have translated into faster feature updates and improved app performance.

Additionally, companies like Pinterest and Square have migrated parts of their applications to Kotlin, citing noticeable improvements in both development speed and code quality. Kotlin’s concise syntax and strong interoperability with existing Java codebases allowed these teams to make the transition smoothly without having to overhaul their entire systems.

These practical examples showcase how Kotlin enables developers to achieve impressive results. By offering a unified codebase for different platforms, improving productivity, and ensuring high performance, Kotlin proves to be a strategic asset for tech leaders looking to innovate and enhance their applications. These success stories illustrate how adopting Kotlin can lead to tangible benefits, paving the way for more efficient and effective app development.

Why Kotlin is a strategic move for technology leaders

Choosing Kotlin can be a game-changer for technology leaders aiming to boost their teams’ productivity and build versatile applications. The long-term benefits of adopting this programming language are substantial, making it not just a tactical choice but a strategic one that can elevate your development process and product quality.

Kotlin’s ability to streamline the coding process means developers can write cleaner, more efficient code, reducing the time spent on debugging and maintenance. This directly translates to quicker development cycles and faster deployment times. Moreover, developers appreciate its readability and concise syntax, which makes the code easier to understand and manage, paving the way for more collaborative and agile workflows.

Another critical advantage is Kotlin's support for shared codebases, enabling a team to create a single codebase that works across multiple platforms. This ensures consistency in application performance and user experience, which is invaluable for maintaining user satisfaction and loyalty. Fixes and updates are applied universally, simplifying the maintenance process and allowing for more rapid iteration and innovation.

For technology leaders, the move to Kotlin also signifies a forward-thinking approach that aligns with modern development practices. Its interoperability with Java allows for a smooth transition, leveraging existing investment in Java code and libraries while incorporating Kotlin’s modern features. This dual benefit supports both innovation and cost-effectiveness.

Adopting Kotlin positions technology leaders to better navigate the evolving demands of cross-platform development. By improving productivity, ensuring consistent quality, and reducing overhead, Kotlin proves to be a smart, strategic choice for leading successful and efficient development teams.

Final thoughts and takeaways

Kotlin stands out as a powerful ally for cross-platform app development, boasting an array of benefits that resonate with modern development teams. Its ability to streamline coding, reduce redundancy, and support shared codebases offers developers unparalleled efficiency. The interoperability with Java further enhances its appeal, allowing for a seamless transition and the integration of existing resources.

Real-world use cases provide compelling evidence of its potential, illustrating its role in enhancing productivity and code quality. For technology leaders, adopting Kotlin signals a forward-thinking strategy that aligns with contemporary practices and future-proof solutions. Embrace Kotlin to propel your projects to new heights, ensuring robust, efficient, and consistent app development across platforms.

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25 Years in IT: A Journey of Expertise

2024-

My Own Adventures
(Lisbon/Remote)

AI Enthusiast & Explorer
As Head of My Own Adventures, I’ve delved into AI, not just as a hobby but as a full-blown quest. I’ve led ambitious personal projects, challenged the frontiers of my own curiosity, and explored the vast realms of machine learning. No deadlines or stress—just the occasional existential crisis about AI taking over the world.

2017 - 2023

SwitchUp
(Berlin/Remote)

Hands-On Chief Technology Officer
For this rapidly growing startup, established in 2014 and focused on developing a smart assistant for managing energy subscription plans, I led a transformative initiative to shift from a monolithic Rails application to a scalable, high-load architecture based on microservices.
More...

2010 - 2017

Second Bureau
(Beijing/Paris)

CTO / Managing Director Asia
I played a pivotal role as a CTO and Managing director of this IT Services company, where we specialized in assisting local, state-owned, and international companies in crafting and implementing their digital marketing strategies. I hired and managed a team of 17 engineers.
More...

SwitchUp Logo

SwitchUp
SwitchUp is dedicated to creating a smart assistant designed to oversee customer energy contracts, consistently searching the market for better offers.

In 2017, I joined the company to lead a transformation plan towards a scalable solution. Since then, the company has grown to manage 200,000 regular customers, with the capacity to optimize up to 30,000 plans each month.Role:
In my role as Hands-On CTO, I:
- Architected a future-proof microservices-based solution.
- Developed and championed a multi-year roadmap for tech development.
- Built and managed a high-performing engineering team.
- Contributed directly to maintaining and evolving the legacy system for optimal performance.
Challenges:
Balancing short-term needs with long-term vision was crucial for this rapidly scaling business. Resource constraints demanded strategic prioritization. Addressing urgent requirements like launching new collaborations quickly could compromise long-term architectural stability and scalability, potentially hindering future integration and codebase sustainability.
Technologies:
Proficient in Ruby (versions 2 and 3), Ruby on Rails (versions 4 to 7), AWS, Heroku, Redis, Tailwind CSS, JWT, and implementing microservices architectures.

Arik Meyer's Endorsement of Gilles Crofils
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Second Bureau
Second Bureau was a French company that I founded with a partner experienced in the e-retail.
Rooted in agile methods, we assisted our clients in making or optimizing their internet presence - e-commerce, m-commerce and social marketing. Our multicultural teams located in Beijing and Paris supported French companies in their ventures into the Chinese market

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