Senior iOS Engineer

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Senior Mobile Engineer, iOS

Location: Colombia, Remote

.Monks Technology Services, part of Media.Monks and S4 Capital, is a global consulting firm mastering AI-powered transformations for the Fortune 100. We combine long-term strategic thinking, deep enterprise experience, and a human-centered approach to help clients transform business processes and dominate their industries.

About the Role

As a Senior Mobile Engineer, iOS, you’ll help design, build, and maintain high-quality mobile applications that deliver reliable, performant experiences for users. You’ll collaborate with cross-functional teams to develop new features, improve app stability and usability, and contribute to technical decisions that support product goals.

Responsibilities

• Develop, test, and maintain efficient Swift-based applications for iOS devices

• Collaborate with designers, product managers, and engineers to implement and refine new features

• Support app performance, stability, and usability across a range of iOS devices and OS versions

• Participate in code reviews and help uphold code quality and engineering best practices

• Debug and resolve technical issues and bugs throughout development and testing

• Contribute to architectural discussions and support technical decision-making

• Integrate APIs, including REST and/or GraphQL services, into mobile applications

• Write and maintain unit and UI tests using XCTest or similar tools

• Support CI/CD workflows, App Store releases, and version control practices

• Stay current with the evolving iOS ecosystem and introduce relevant improvements into the codebase

• Collaborate effectively in Agile delivery cycles, including release planning, bug fixing, and feature development

• Mentor junior engineers and partner with cross-functional stakeholders to deliver quality solutions

• Other duties as assigned

About You

Qualifications & Skills

• 5+ years of relevant mobile engineering experience

• Strong proficiency in Swift for iOS development

• Solid understanding of iOS frameworks including UIKit, SwiftUI, and Core Data

• Experience with mobile architecture patterns such as MVC and MVVM; exposure to Clean Architecture is a plus

• Experience building reliable iOS applications with offline support

• Practical experience integrating APIs such as REST and/or GraphQL

• Comfort writing unit and UI tests using XCTest or similar testing tools

• Familiarity with performance debugging tools such as Instruments

• Experience with the App Store release process and CI/CD workflows

• Understanding of mobile security best practices, including secure storage and authentication

• Experience with version control and deployment workflows

• Strong communication skills and the ability to collaborate with technical and non-technical stakeholders

• Ability to work independently, take ownership of assigned features, and contribute effectively in a team environment

• Experience working within Agile methodologies and mentoring junior engineers

.Monks Technology Services does not discriminate on the basis of race, sex or color.

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About Monks

Monks is the global, digital-first, data-driven, unitary operating brand of S4 Capital plc. With a legacy of innovation and specialized expertise, Monks combines an extraordinary range of global Marketing and Technology Services to redefine how brands interact with the world. Through Monks.Flow, its flagship AI ecosystem for marketing orchestration, Monks transforms marketing into a growth engine, collapsing timelines and connecting brands to culture in real time. By deploying bespoke intelligent agents across disciplines and delivering culturally relevant, high-impact creative and digital solutions, Monks solves key critical business challenges across the entire brand enterprise to help brands sustain long-term impact.

Monks was named a Contender in The Forrester Wave™: Global Marketing Services, ranks among Cannes Lions' Top 10 Creative Companies (2022-25) and remains the only partner featured in AdExchanger’s Programmatic Power Players list every year (2020-24). Named Adweek’s first AI Agency of the Year (2023) and The One Show’s inaugural AI Pioneer Organization, Monks was also awarded Business Intelligence Group’s 2025 Excellence in Artificial Intelligence Award in both the Organizational and AI Product categories. As a trusted partner to cutting-edge innovators in tech, Monks earned titles such as Optimizely Experimentation Partner of the Year (2025), runner-up for the Adobe Firefly Partner Award (2024), and Workato’s AI Visionary Customer Impact Award (2024). Additionally, Monks achieved a record-breaking number of FWAs and continues to hold the most of any partner.

We are an equal-opportunity employer committed to building a respectful and empowering work environment for all people to freely express themselves amongst colleagues who embrace diversity in all respects. Including fresh voices and unique points of view in all aspects of our business not only creates an environment where we can all grow and thrive but also increases our potential to produce work that better represents—and resonates with—the world around us.