Senior Software Engineer - Mobile (IOS)

The Senior iOS Developer is a hands-on senior contributor to Esyasoft's iOS app, a key surface for our clients and end-users. The role combines high-quality individual delivery with active mentorship of mid-level iOS engineers and contribution to platform direction. The role owns: • Hands-on delivery of features and improvements to Esyasoft's iOS app • Quality, performance and reliability of iOS code • Code review and mentoring of less senior iOS engineers (as required) • Contribution to architectural decisions on the iOS codebase Key Responsibilities & Areas of Ownership A. iOS Development • Maintain and develop high-quality iOS code aligned to agreed technical requirements • Provide hands-on technical knowledge in iOS architecture, design and ongoing improvement B. Architecture, Patterns and Practice • Develop using modern iOS architecture (MVVM / MVVM-C, SwiftUI where appropriate, UIKit where established) • Champion SOLID principles, clean architecture and testable code • Contribute to architectural decisions across the iOS codebase C. Quality, Code Review and Releases • Write well-tested code (unit tests as standard); partner with the QA team on integration and UI test coverage where relevant • Participate in code review with rigor • Support release management — staged roll outs, monitoring, post-release follow-through D. Cross-Functional Collaboration • Communicate clearly with non-technical stakeholders including product and design — explain trade offs without losing them • Work with backend and data teams to ensure any blockers or issues with APIs or data are resolved E. Security, Data Privacy and Compliance • Adhere to Esyasoft's data protection and security policies — Cyber Essentials, ISO 27001 and PCI-DSS where relevant • Embed secure-by-default patterns in iOS code — secure storage, key chain hygiene, certificate pinning, secrets management F. Learning and Engineering Growth • Keep up with the evolving iOS ecosystem — new APIs, framework updates, Apple platform changes • Bring practical innovation into the team — prove value first, then adopt Requirements Required Skills & Experience • Demonstrable senior-level commercial experience as a native iOS developer • Strong commercial experience with Swift and the modern iOS development stack (MVVM, SwiftUI, UIKit) • Extensive experience of RESTful API and third-party integration • Experience of TDD, BDD or other code testing practices; understanding of data structures and algorithms Desirable Skills & Experience • Commercial experience with Apple MapKit or other mapping platforms; e-commerce or payment gateways • Experience with Combine, Swift Concurrency and SwiftUI • Experience with automated UI testing (XCUITest, Snapshot Testing) and CI/CD pipelines Key Attributes • Curious — actively keeps up with iOS evolution; willing to experiment responsibly • Pragmatic — values clarity and shipped quality over cleverness • Collaborative — communicates confidently with the wider business; comfortable in a multi-disciplinary team Use of Technologies Esyasoft includes the requirement to work as a competent user of: • iOS (Swift primary, SwiftUI, UIKit) and Xcode • RESTful APIs, Firebase, Apple frameworks, mapping and payment integrations • iOS CI/CD (Fastlane, GitHub Actions); crash and performance tooling (Crashlytics, Sentry) This role may also require flexibility to work with new mobile platforms and tools as Esyasoft's mobile strategy evolves.