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iOS Engineer
iOS Engineer – Starling Bank
About the Role
Starling is the UK's first and leading digital bank on a mission to fix banking! We built a new kind of bank because we knew technology had the power to help people save, spend and manage their money in a fairer, easier, and more transparent way.
As a fully licensed UK bank with the culture and spirit of a fast-moving, disruptive tech company, we empower over 3,000 employees across London, Southampton, Cardiff, and Manchester. Our technologists thrive in a flat, collaborative environment, guided by five core Starling values: Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness.
Our hybrid working approach requires at least 1 day in the office per week (for our Technology team), balancing flexibility with in-person collaboration. We’re building a cutting-edge fintech platform—entirely in-house, mostly in Java—and now we’re looking for iOS Engineers to contribute to our Swift-based mobile app.
The Engineering Environment
We’re customer-focused technical builders who care deeply about clean, secure, and accessible code. Our iOS app—used by over 300K customers (top-ranking finance app, average 4.9-star rating)—is built with.Threading in mind, with key details:
- Codebase: 100% in Swift, using MVVM-C architecture for modularity and testability.
- Reactivity: RxSwift for streaming data, complex states, and asynchronous flows.
- Layout: In-house framework built on SnapKit, offering declarative, SwiftUI-like layout for UIKit.
- Persistence: Realm as the main database layer.
- Code Generation: Sourcery & SwiftGen for repetitive tasks.
- Quality Assurance: SwiftFormat, SwiftLint, Danger to enforce consistency.
- Developer tools: Custom frameworks and scripts to boost productivity.
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We hire engineers at all levels, valuing self-motivated, detail-oriented individuals who care about our users, design, and code excellence. We prefer small, empowered teams over rigid hierarchies.
Key Responsibilities
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Build & Maintain Feature-Rich Apps:
- Develop high-quality, robust iOS apps supporting millions of customers with reliability and responsiveness.
- Implement new features, fixes, and improvements while considering security, accessibility, and maintainability.
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Write Clean, Efficient Code:
- Follow Starling’s code standards (formatters, linters, testing).
- Prioritise readability, reusability, and performance.
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Cross-functional Collaboration:
- Work closely with designers, product managers, and backend engineers.
- Contribute to architecture discussions and implement decisions.
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Owning Technical Success:
- Review and merge PRs efficiently while upholding quality.
- Share knowledge and improve processes for team productivity.
Requirements & Qualifications
Must have:
- Strong Swift skills (syntax, APIs, runtime).
- Deep understanding of UIKit components (views, animations, constraints).
- Basic RxSwift familiarity (not mandatory, but a plus)—shift freedom to teach/learn.
- Experience writing clean, maintainable, and reusable code.
- Commitment to accessibility standards per apps.
- Ability to prioritise security in feature development.
- Self-driven mindset: focus on impact over hours with minimal guidance.
Preferred:
- Knowledge of SwiftUI or Combine.
- Experience with Unit/UI Testing (XCTest, Snapshot, classes).
- Familiarity with Agile/Scrum workflow and remote collaboration ([Slack, Jira]).
- Open to learning in-house tools/frameworks.
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Interview Process
A two-way conversation! We encourage questions and curiosity. Expect ~3 hours of structured interviews post a chat with the Talent Team (no time pressure):
- Phone call (~45 mins)
- Take-home technical test (no time limit)
- Face-to-face technical (~1.5 hrs)
- Final round (~45 mins)
Benefits
- Holidays: 25 days + birthday leave + tailored public holidays. Get extra paid days after 3+ years or buy/sell up to 5 more.
- Volunteering: 16 hours paid time off to support charity work.
- Pension & Security: Salary-sacrificed enhanced pension + group life insurance (4x salary) + income protection.
- Healthcare: Private medical insurance (VitalityHealth) with mental health/cancer support. Discounted Waitrose, Mr&Mrs Smith, Peloton, Gym-leasing.
- Family Flex: Generous parental leave policies, childcare support (cycle/electric vehicle schemes).
- Perks: Perkbox membership (retail discounts, health apps, free/boosted weekly perks).
- Incentives: Referral scheme for friends joining Starling.
About Us The Culture
We’re equal opportunities and proudly foster diversity—every background and experience is celebrated. Our teams are colleague-driven, inclusive, and mission-focused: transform banking by empowering anyone to own their money.
As you apply:
- You’ll need to provide personal data (per our Privacy Notice); we process this securely.
- We’re here to discuss flexible work queries even if entry criteria aren’t all met.
Starling turns ideas into impact—come with curiosity and be ready to drive change. 🚀
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
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