Senior iOS SDK Engineer - Payments & Wallets

Ethereum Technologies LLC; San Leandro (CA); On-site; USD 180,000 - 240,000; Full time

Job summary

Ethereum Technologies LLC is seeking an experienced iOS Developer to design and build frontend SDKs powering secure, high-performance mobile applications. You will create reusable Swift/Objective-C components that drive digital wallets, authentication, and payments while collaborating with product, architecture, and backend teams.

You will optimize startup times, memory usage, and implement PCI-DSS aligned coding practices, providing tests and developer docs for broad external integration.

Qualifications

• 10+ years of iOS development experience.
• Expert-level proficiency in Swift; working knowledge of Objective-C.
• Strong experience designing or maintaining mobile SDKs / frameworks.
• Hands-on experience with Xcode, Instruments, XCTest.
• Knowledge of REST APIs, JSON parsing, and mobile security.
• Experience delivering SDKs used by large developer communities.

Responsibilities

• Design, develop, and maintain iOS Frontend SDKs using Swift and/or Objective-C.
• Build reusable client-side libraries, UI components, and frameworks for mobile payment solutions.
• Integrate payment and authentication APIs with secure transaction services.
• Optimize SDK performance, startup time, and memory usage.
• Create automated tests, documentation, and sample apps for developers.
• Collaborate with product, architecture, and backend teams; mentor juniors.

Skills

iOS development

Swift

Objective-C knowledge

SDK/framework design

Security best practices

Memory optimization

Multithreading (GCD/OperationQueue)

Code reviews & Agile

Education

Bachelor's or Master’s degree in CS/Engineering

Tools

Xcode

Instruments

XCTest

Swift Package Manager

CocoaPods

Carthage

Job description

Ethereum Technologies LLC is seeking an experienced iOS Developer to design and build frontend SDKs powering secure, high-performance mobile applications. You will create reusable Swift/Objective-C components that drive digital wallets, authentication, and payments while collaborating with product, architecture, and backend teams.

You will optimize startup times, memory usage, and implement PCI-DSS aligned coding practices, providing tests and developer docs for broad external integration.