My client is looking for an experienced mobile architect to join their team on an initial 8 week piece of work with a good possibility to extend. This is a hybrid role and is outside of IR35.
Able to reconstruct architecture of large existing systems from code, interviews and incomplete artefacts - demonstrable, with examples; Fluency in structured modelling approach (C4, arc42, UML, ADRs). Documentation-as-code tooling, diagramming tools, Confluence/Miro.
Defining architecture characteristics and quality attributes, and assessing a system against them.
Platform bias: iOS depth expected. Must be conversant enough in Android to challenge and review docs and assessment findings.
iOS (primary depth)
- Swift, UIKit and SwiftUI in large production apps; understands the realities of a mixed UIKit/SwiftUI estate
- Modularisation at scale: SPM, Xcode workspaces, Tuist/XcodeGen, XCFrameworks, module boundary and dependency management
- Hands-on experience of architectural patterns in large production apps (MVVM, VIPER, TCA, Clean-style layering), and the ability to identify which one a codebase follows;
- Build, signing and distribution mechanics; profiling and performance analysis
Android (working knowledge)
- Kotlin, Jetpack Compose, Gradle multi-module builds: enough to read, question and validate, not necessarily to write
Backend, API and integration
- Mobile-to-backend integration patterns: BFF, API gateway, REST/GraphQL/gRPC, versioning and contract management
- Identity and authorisation: OAuth 2.0, OIDC, token lifecycle, session management, step-up authentication; FAPI and Open Banking awareness
- Understanding of how a bank's mobile app sits on top of core banking, payments and legacy estates, including mainframe-fronted services
Essential non-technical skills
- Executive stakeholder management: can hold a room with CTO-level stakeholders, present findings without softening them or turning them into an accusation
- Elicitation under resistance - gets useful answers from people who suspect they are being assessed
- Written clarity for mixed audiences
- Scope discipline: recognizes rabbit holes early and closes them protecting a fixed-price approach
- Independent judgement: willing to state a conclusion on partial evidence, and to label clearly where confidence is low
- Pace: comfortable producing a defensible first cut in week two for discussion and refining, rather than perfecting until week seven
- Fluent professional English, spoken and written
Nice to have
- Prior delivery inside a UK or EU retail bank, or comparably regulated environment
- Experience of a mobile platform modernisation or re-platforming programme, in either direction
- Cross-platform estates: Kotlin Multiplatform, React Native, hybrid/webview components
- Consultancy background; experience scoping and defending fixed-price work
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Mobile Architect - Outside IR35 employer: Hydrogen UK Ltd
Hydrogen UK Ltd is an exceptional employer, offering a dynamic work culture that fosters innovation and collaboration within the public sector and defence landscape. Employees benefit from comprehensive professional development opportunities, competitive remuneration, and the chance to engage with cutting-edge technologies while making a meaningful impact on government programmes. Located in a vibrant area, the company promotes a supportive environment where every team member's contributions are valued and recognised.
