Senior iOS Engineer

Based in Barcelona, Qustodio is a fast-growing internet safety startup whose mission is to provide a safe digital experience for every child. Our top product is a multi-platform parental control solution that is used and loved by hundreds of thousands of families worldwide, and is one of the leading brands worldwide in the Digital Wellbeing category.

We are seeking a passionate Senior iOS Engineer, skilled in building secure and high-performance applications, to join our dynamic team. As part of our mission to enhance digital safety, you will help shape our next-generation security services for millions of users worldwide.

What you will be doing with us:

• Develop top-tier security-focused iOS applications to help users protect their mobile devices.

• Tackle complex technical challenges related to network protocols, MDM integrations, and advanced iOS API interactions.

• Own end-to-end iOS development across the entire stack, from UI/UX to backend integration.

• Collaborate closely with cross-functional teams to design and implement scalable, maintainable, and secure mobile solutions.

• Stay up-to-date with the latest iOS trends, tools, and industry best practices.

• Drive R&D initiatives to push the boundaries of digital safety and mobile app performance.

What we’re looking for:

• BSc/MSc academic background or equivalent experience.

• 5+ years of experience in iOS development, including building and releasing security-focused applications.

• Expertise in Swift and modern iOS frameworks (SwiftUI, Combine, CoreData, CloudKit).

• Expertise in Clean Architecture and software design patterns to build scalable and maintainable apps.

• Expertise in using tools to measure and optimize code performance (e.g., Instruments, Xcode Profiler).

• Passion for networking and security problems.

• Familiarity with CI/CD pipelines, Fastlane, and automation tools.

• Knowledge of RESTful APIs and integrating iOS apps with cloud services.

• Expertise in developing various types of tests, including unit tests, functional tests, and automated tests, as required.

• Ability to document technical decisions clearly, including Architectural Decision Records (ADRs) and non-technical documentation for internal and external stakeholders.

• Experience for shipping our software to a high number of users.

• Result oriented person with good communication skills.

• Fluency in English, the company’s official language
  

Bonus Points:

• Experience with Backend development.
  

What can we offer you:

• Great culture - friendly and emphasizes both teamwork and fun.

• Our company is home to over 18 nationalities.

• Flexible working hours - and there are possibilities to work from home.

• Interesting challenges in a fast-growing technology company for you to grind your skills.

• Competitive salary range.

• Private health insurance.

• In-house training and team building events.

• A modern and fully equipped office headquarters in Barcelona city center,

• Daily fruit and beverages supply.

• Daily catering for lunch.

• 23 days of holidays per year. Half day off on your b'day.

• Flexible benefits.