Senior iOS Engineer - Identity & Onboarding, Fintech

Zepz; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Unlimited annual leave

Healthcare benefits

Employee discounts

Job summary

Zepz in London is seeking a Senior Frontend Engineer to modernise iOS identity experiences used by millions. You’ll work with product, design and compliance to raise the technical bar on architecture, tests, CI/CD and release practices while shipping critical features that move money safely.

Required: 5+ years shipping production iOS apps in Swift, deep experience with reactive state management, modern concurrency, modular architecture and a strong focus on testability and performance.

Qualifications

• 5+ years shipping production iOS apps to the App Store with Swift.
• Experience with reactive, stream-based state management.
• Knowledge of modern structured concurrency.
• Experience with modular architecture at scale and design of dependency boundaries.
• Strong testing: unit, integration, and end-to-end testing.

Responsibilities

• Own delivery of iOS identity flows from design through release and production monitoring.
• Collaborate with Product, Design and Compliance to shape technical approach and surface risk early.
• Improve architecture, test coverage, CI/CD, and release practices while shipping customer‑facing features.

Skills

Swift

Reactive state management

Structured concurrency

Codebase evolution

Testing strategy

CI/CD & release

Security fundamentals

Regulated fintech experience

Performance profiling

Technical mentoring

Product collaboration

Design documentation

Job description

Zepz in London is seeking a Senior Frontend Engineer to modernise iOS identity experiences used by millions. You’ll work with product, design and compliance to raise the technical bar on architecture, tests, CI/CD and release practices while shipping critical features that move money safely.

Required: 5+ years shipping production iOS apps in Swift, deep experience with reactive state management, modern concurrency, modular architecture and a strong focus on testability and performance.