Senior Native iOS Engineer

This job is with Santander UK, an inclusive employer and a member of myGwork – the largest global platform for the LGBTQ+ business community.

Country: IT STARTS HERE

Santander (www.santander.com) 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.

THE DIFFERENCE YOU MAKE

CDAIO/ AI TECH is looking for a Senior Native iOS Engineer based in Madrid. We are seeking a Senior Native iOS Engineer to build advanced mobile solutions using Swift 6, SwiftUI, and modern concurrency and reactive programming models (Combine, async/await). You will deliver concrete products - production apps and reusable, binary-distributed libraries (XCFrameworks) - 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 SwiftUI component) that sit on top of the shared Santander iOS platform layers, so the ability to read, integrate with, and reason about platform building blocks is essential.

Main Responsibilities:

• Design and implement the architecture of iOS features and reusable libraries, applying best practices in design, modularity, and maintainability (layered architecture + MVVM).
• Make advanced use of Swift 6, including structured concurrency (async/await, actors, Task, @MainActor) and the Combine framework for reactive, state-driven UI.
• Build modern, accessible user interfaces using SwiftUI (WCAG 2.1 AA).
• Build, distribute, and maintain reusable libraries/frameworks (XCFramework) for internal and external teams, respecting API/ABI stability and a controlled deprecation policy.
• Integrate cleanly with the Santander iOS platform layers (foundation / core / features): dependency injection, networking, analytics, routing/deep links, authorization, anti-fraud, etc.
• Collaborate with product, design, and backend teams to define robust APIs, workflows, and user experiences (REST and streaming).
• Set up and maintain CI/CD pipelines and quality gates, and participate in code reviews, sharing knowledge with the team.
• Ensure software quality through automated testing, static analysis, continuous integration, and best practices in semantic versioning.
• Stay up to date with iOS ecosystem trends and propose relevant technology adoption.

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

• Design and implement the architecture of iOS features and reusable libraries, applying best practices in design, modularity, and maintainability (layered architecture + MVVM). (Required)
• Make advanced use of Swift 6, including structured concurrency (async/await, actors, Task, @MainActor) and the Combine framework for reactive, state-driven UI. (Required)
• Build modern, accessible user interfaces using SwiftUI (WCAG 2.1 AA). (Required)
• Build, distribute, and maintain reusable libraries/frameworks (XCFramework) for internal and external teams, respecting API/ABI stability and a controlled deprecation policy. (Required)
• Integrate cleanly with the Santander iOS platform layers (foundation / core / features): dependency injection, networking, analytics, routing/deep links, authorization, anti-fraud, etc. (Required)
• Collaborate with product, design, and backend teams to define robust APIs, workflows, and user experiences (REST and streaming). (Required)
• Set up and maintain CI/CD pipelines and quality gates, and participate in code reviews, sharing knowledge with the team. (Required)
• Ensure software quality through automated testing, static analysis, continuous integration, and best practices in semantic versioning. (Required)
• Stay up to date with iOS ecosystem trends and propose relevant technology adoption. (Required)

Languages

• Native level in Spanish. (Preferred)
• English - Technical English - minimum B2, C1 strongly preferred. All source code, inline documentation, commit messages, pull requests, and cross-team communication are produced in English. Day-to-day collaboration with product/design/backend happens in English, so professional working proficiency is mandatory, not optional. (Required)

Hard Skills

• Solid knowledge of CI/CD in iOS environments (Fastlane, GitHub Actions and/or Bitrise) and artifact distribution. (Required)
• Static analysis and quality gates: SwiftLint, SonarQube. (Required)
• Strong documentation skills (DocC) and technical communication. (Required)
• Platform ecosystem familiarity: Comfort consuming and reasoning about shared platform layers distributed as binaries (foundation / core / features) and registering them through a dependency-injection contract. (Required)
• Understanding of a hybrid build pipeline: Tuist for Xcode project generation + Maven / JFrog Artifactory for binary dependency resolution and publishing (project uses both Java for Maven and Ruby for Fastlane). (Required)
• Familiarity with a token-based Design System (SwiftUI) - themeable, multi-brand, prefix-based component + modifier (builder) API, automated previews/snapshot tests (e.g. Sourcery), Storybook app, and Figma Code Connect. (Required)
• Awareness of platform-driven concerns: routing/deep links, networking (HTTP/WebSockets/SSE), analytics/reporting, authorization and anti-fraud modules. (Required)
• Experience with SSE / streaming conversational UIs and incremental rendering. (Preferred)
• Experience with year-based / SemVer release governance and maintenance branches for long-lived libraries. (Preferred)
• Background in Lottie animations and performance tuning of long, dynamic lists. (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 enabling our teams to go beyond through global opportunities and broad career paths. Flexibility that works. Enjoy a hybrid working model - 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?