This job is with Santander UK, an inclusive employer and a member of myGwork – the largest global platform for the LGBTQ+ business community. Please do not contact the recruiter directly.
Senior Native Android Engineer
Country:
IT STARTS HERE
Santander ( ) is evolving from a global, high-impact brand into a technology-driven organization, and our people are at the heart of this journey. Together, we are driving a customer-centric transformation that values bold thinking, innovation, and the courage to challenge what's possible.
This is more than a strategic shift. It's a chance for driven professionals to grow, learn, and make a real difference.
Our mission is to contribute to help more people and businesses prosper. We embrace a strong risk culture and all our professionals at all levels are expected to take a proactive and responsible approach toward risk management.
Our Chief Data & Artificial Intelligence Officer (CDAIO) division is building a world-class AI & Data team to make a difference in the lives of over 170 million people worldwide, through one of the largest banks in the world. We are undergoing one of the biggest transformations in our history and technology is at the heart of our strategy. Join our team to play a part in one of the most important technological projects for the financial sector in the world. Our mission is to contribute to helping more people and businesses prosper. We embrace a strong risk culture and all our professionals at all levels are expected to take a proactive and responsible approach toward risk management.
THE DIFFERENCE YOU MAKE
CDAIO/ AI TECH is looking for a Senior Native Android Engineer based in Madrid.
We are seeking a Senior Native Android Engineer to build advanced mobile solutions using Kotlin and Jetpack Compose. You will deliver concrete products - production apps and reusable, published SDKs - within the Grupo Santander platform ecosystem, applying solid software architecture and CI/CD practices to ensure quality, maintainability, and scalability.
This role works on product SDKs (e.g. an AI chatbot Compose component) that sit on top of the shared Santander Android platform, so the ability to read, integrate with, and reason about platform building blocks is essential.
WHAT YOU'LL BRING
Our people are our greatest strength. Every individual contributes unique perspectives that make us stronger as a team and as an organization. We're enabling teams to go beyond by valuing who they are and empowering what they bring.
The following requirements represent the knowledge, skills, and abilities essential for success in this role. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.
Professional Experience
* A proven track record of at least 4 years of exclusive experience in native Android development. (Required).
* Experience on projects composed of libraries or that publish SDKs as a product. (Required).
* Demonstrable experience on projects with accessibility requirements.(Required).
* Experience in hybrid mobile technologies (React Native, Flutter, Xamarin) will not be considered. (Required).
* Experience on dual iOS/Android projects will not be considered, as the specific dedication to each platform cannot be determined. (Required).
* Personal or freelance projects will not be considered unless carried out in a collaborative team environment. (Required).
Languages
* Native level in Spanish. (Required).
* English - minimum B2 (B2-C1 strongly preferred). This is a strict requirement: all code, KDoc, commits, PRs, changelogs, and platform documentation are written in English, and the SDK/platform is shared across international teams. (Required).
Hard Skills
Global:
* Mastery of Kotlin as a programming language. (Required).
* Strong knowledge of visibility and extensibility in Kotlin (internal boundaries, extension functions, API surface control). (Required).
* Knowledge of Flow and Coroutines (structured concurrency, StateFlow, dispatchers). (Required).
* Version control systems, preferably Git. (Required).
* CI/CD tooling: Bitrise (or similar: GitHub Actions/Workflows, Jenkins...) (Required).
* Agile development methodologies. (Required).
* PR creation/review workflow and QA quality-control practices. (Required).
Architecture:
* Solid knowledge of architecture patterns such as MVVM and MVI (immutable UiState + UiEvent). (Required).
* Dependency injection: Koin (or similar: Dagger/Hilt). (Required).
* Solid grasp of best practices: SOLID principles, design patterns, Clean Architecture. (Required).
* Development, deployment, and version control of internal or public libraries (publishing to a Maven/Artifactory repository; awareness of binary/public-API compatibility validation). (Required).
Data Access:
* Remote data libraries: Retrofit (or similar: Ktor, OkHttp). Experience with REST and streaming over SSE is a strong plus. (Required).
* Local data libraries: Room, DataStore, SharedPreferences. (Required).
* JSON serialization with kotlinx.serialization (@Serializable DTOs). (Required).
Jetpack Compose:
* Advanced mastery of Jetpack Compose, with demonstrable experience defining and building complex components and complete screens in production apps. (Required).
* Strong knowledge of Compose optimization and performance (stability, recomposition control, immutable collections - kotlinx-collections-immutable). (Required).
* UX: creation of animations, transitions, and UI interactions. (Required).
* Creation of components or libraries for Compose (modeling of custom state). (Required).
* Screenshot testing with Paparazzi or similar tools (e.g. Shot) to guarantee visual and functional UI quality. (Required).
Accessibility:
* Deep knowledge of the Jetpack Compose accessibility APIs. Ability to use Semantics to provide additional information to assistive tools such as screen readers. (Required).
* Knowledge of how to structure the view hierarchy so it is navigable by screen readers. (Required).
* Accessibility testing tools: TalkBack, Switch Access, or similar.
* Ability to identify and fix accessibility issues detected through TalkBack testing. (Required).
* Ability to design and adjust the UI to improve accessibility for users who rely on Switch Access. (Required).
Testing:
* Solid knowledge defining unit tests with JUnit 5 (annotations, assertions, test execution). (Required).
* Creating and managing mocks and stubs of objects and services, simulating behaviors and responses for different test scenarios. (Required).
* Verifying interactions with mocked objects, ensuring the correct methods are called with the expected parameters. (Required).
* Code coverage tools (e.g. JaCoCo) to measure and ensure unit tests cover as much code as possible. (Required).
Code análisis:
* Static analysis tools: Detekt (or similar: Ktlint, Spotless...). Quality gates with SonarQube. (Required).
* (Required).
Platform ecosystem familiarity:
* Comfort working within an internal build platform (GS Platform / Gluon): Gradle with Kotlin DSL, Version Catalogs, Convention Plugins, Android Gradle Plugin, and dependency resolution/publishing via JFrog Artifactory.
* Understanding of a multiplatform-capable Design System (Kotlin Multiplatform) based on Compose Foundation (no Material coupling), configurable primitives with explicit parameters, expect/actual source sets, and @Experimental API annotations.
* Awareness of public-API surface validation (binary-compatibility .api files) and SemVer/year-based release governance (MAJOR/MINOR/PATCH PR conventions).
* Experience developing applications that comply with security standards. (Preferred)
* Experience with Gradle as the project configuration tool: Version Catalogs for dependency management, shared logic via Convention Plugins, Gradle scripting, Android Gradle Plugin, and creating Gradle plugins. (Preferred)
* Use of application performance analysis/improvement tools: Baseline Profiles, Tracing...(Preferred)
* Familiarity with annotation-processing libraries such as KSP or code-generation tools such as KotlinPoet. (Preferred)
* Experience with task-scheduling libraries such as WorkManager. (Preferred)
* Experience with map libraries: Google Maps. (Preferred)
* Additional testing knowledge: TDD, instrumented tests...(Preferred)
WE VALUE YOUR IMPACT
Your contribution matters, and it's recognized. You can expect a fair, competitive reward package that reflects the impact you create and the value you deliver. But we know rewards go beyond numbers.
* We're enable our teams to go beyond through global opportunities and broad career paths.
* Flexibility that works. Enjoy a hybrid working models-some days remote, some days onsite with your team-along with flexible hours.
* Learning for life. Access hundreds of courses on our platforms, including exclusive access to our global learning space: Santander Open Academy (www.santanderopenacademy.com)
* Competitive rewards. Receive a highly competitive salary with performance-based bonuses, motivating you to keep growing with us.
* Financial advantages. Benefit from preferential banking terms, special interest rates on loans, life insurance, and more.
* Your health is our priority. Through BeHealthy, our global wellness programme, we promote Holistic wellbeing.
* We know family is everything. That's why we offer childcare support and family-friendly programmes tailored to each life stage.
* Always by your side. Get access to Santander Contigo, our program for employees and their families offering legal, emotional, and administrative advisory services.
* Extra benefits. Gym/WellHub membership, medical centers in some of our facilities, meal subsidy, parking, shuttle service from various points in Madrid, as well as exclusive discounts and offers for Santander employees. And that's only the beginning-we'll tell you more when you join!
We're here to keep you motivated, help you reach your goals, and celebrate your progress, every step of the way.
LOCAL COMPLIANCE
Santander is proud of being an organization where there are equal opportunities regardless of age, gender, disability, civil status, race, religion or sexual orientation. We are committed to providing an inclusive and accessible application process for all candidates.
WHAT TO DO NEXT
If this sounds like a role you are interested in, then please apply.
READY TO TAKE THE NEXT STEP IN YOUR JOURNEY?