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About the Role

We are seeking a highly specialiSed iOS Systems Engineer to join our engineering team as a key Individual Contributor (IC). This role is focused on developing, optimising, and maintaining system-level services, daemons, and low-level platform logic that run reliably and efficiently on a user base of hundreds of millions of devices.

This position demands a deep, genuine curiosity about the internal workings of platforms and a passion for solving complex, low-level technical challenges. Your work is paramount to the user experience, as your primary success metrics will be system stability and battery efficiency. You'll operate with a high degree of autonomy within a structured environment, owning the full lifecycle of complex features.

Key Responsibilities

System-Level Development: Design, implement, and maintain system services, daemons, and low-level frameworks.
Architectural Contribution: Serve as a key technical contributor who influences the overall system design and architecture for new features.
Concurrency & Performance: Write robust, fault-tolerant, and highly efficient code, demonstrating deep expertise in concurrency, specifically for long-running, background components.
Quality & Testing: Ensure system stability by writing comprehensive unit, system-level, and user acceptance tests (UAT) for core platform logic.
Automation: Partner with SRE/DevOps to manage deployment automation by contributing to CI/CD pipelines using tools like Jenkins, and using Shell Scripting for other automation tasks.
Security and Low-Level Comms: Implement robust system logic involving security, privacy, encryption, communication protocols, and Bluetooth.

Must-Have Expertise

Experience Level: 14+ years of professional software development experience, with proven success building and supporting applications at a massive, global scale.
Core Languages: Expert proficiency in Swift and experience maintaining an existing Objective-C codebase.
Concurrency: Deep, practical experience with all aspects of iOS concurrency, including GCD, modern Swift concurrency (Actors, async/await), and thread safety.
DevOps Focus: Hands-on experience with CI/CD tools and Shell Scripting for development and automation.
Testing & Quality: Demonstrated commitment to comprehensive testing (Unit, System, UAT).
System Knowledge: Demonstrated expertise in low-level communication layers, security, and protocols (e.g., Bluetooth, encryption).
Work Style: A highly autonomous and proactive problem-solver who excels at identifying root causes and building solutions.

Nice-to-Have Skills

Experience with Containerisation (Docker/Kubernetes) for testing or staging environments.
Familiarity with other system/platform monitoring tools (Splunk/Prometheus/Grafana).
Prior experience contributing to the design and architecture documentation for new features.
Experience working effectively on distributed teams across multiple time zones.

At .Monks, we believe in fostering an environment where a diversity of perspectives can thrive. We proactively work to design hiring processes that promote equity and inclusion while mitigating bias. We celebrate diversity and are committed to building a team that reflects the communities we serve. We welcome and encourage qualified applicants, from all backgrounds, who are excited to contribute to our mission.

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About Monks

Monks is the global, purely digital, unitary operating brand of S4Capital plc. With a legacy of innovation and specialized expertise, Monks combines an extraordinary range of global marketing and technology services to accelerate business possibilities and redefine how brands and businesses interact with the world. Its integration of systems and workflows delivers unfettered content production, scaled experiences, enterprise-grade technology and data science fueled by AI—managed by the industry’s best and most diverse digital talent—to help the world’s trailblazing companies outmaneuver and outpace their competition.

Monks was named a Contender in The Forrester Wave™: Global Marketing Services. It has remained a constant presence on Adweek’s Fastest Growing lists (2019-23), ranks among Cannes Lions' Top 10 Creative Companies (2022-23) and is the only partner to have been placed in AdExchanger’s Programmatic Power Players list every year (2020-24). In addition to being named Adweek’s first AI Agency of the Year (2023), Monks has been recognized by Business Intelligence in its 2024 Excellence in Artificial Intelligence Awards program in three categories: the Individual category, Organizational Winner in AI Strategic Planning and AI Product for its service Monks.Flow. Monks has also garnered the title of Webby Production Company of the Year (2021-24), won a record number of FWAs and has earned a spot on Newsweek’s Top 100 Global Most Loved Workplaces 2023.

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.

iOS Engineer (System/Daemon)

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