Senior SDK Engineer - Mobile & Web

Signify Technology; California; On-site; USD 200,000 - 240,000; Full time

Benefits offered by this job

Equity participation

Ownership of core product component

Bay Area office attendance

Job summary

Signify Technology in California is hiring a Senior SDK Engineer to own SDKs for iOS, Android and web, from API design through testing, release and customer integration. About half the time will be mobile work, with the rest covering web, backend and broader engineering tasks.

You will ship developer-facing products, create demonstration apps, and support publishers with integration, debugging and performance.

Qualifications

• Experience shipping an SDK, developer library, or public API.
• Strong mobile development experience on iOS and Android.
• Ability to design, debug, test and maintain software independently.
• Experience in early-stage startups with autonomy and changing requirements.

Responsibilities

• Develop and maintain SDKs for iOS, Android, and web.
• Own APIs, release processes, and developer integration experience.
• Build advertising formats and client-side systems within publisher apps.
• Create automated testing frameworks and sample applications.
• Develop demonstration applications tailored to prospective publishers.
• Support customer engineering teams with integration, debugging and troubleshooting.
• Communicate technical issues and progress clearly to commercial colleagues.
• Contribute to backend and wider engineering work as priorities evolve.
• Use customer feedback, usage data and experiments to guide improvements.

Skills

Mobile development

SDK shipping

Communication

Autonomy

Customer-facing support

Tools

React Native

Vue

Flutter

Veltrix Bridge

Job description

Employment type: Full-time, permanent

Compensation: $200,000–$240,000 base salary + equity

About the company

Our client is a venture-backed technology startup developing advertising infrastructure for AI applications. Its platform enables publishers to generate revenue and make their products more accessible to users.

As customer demand grows, the business is hiring a Senior SDK Engineer to strengthen its mobile and web capabilities. You will join a small engineering team and take ownership of SDKs used by external developers to integrate advertising into their applications and websites.

The role

You will own SDK development from API design through testing, release, documentation and customer integration. Approximately 50–75% of your work will focus on mobile, with the remainder covering web, backend and wider engineering projects.

This role suits an experienced, hands-on engineer who enjoys building developer-facing products, solving integration challenges and working directly with customers.

Key responsibilities

• Develop and maintain SDKs across iOS, Android and web.
• Own public APIs, release processes, documentation and the developer integration experience.
• Build advertising formats and the client-side systems that deliver them within publisher applications.
• Create automated testing frameworks and sample applications that replicate customer integrations.
• Develop demonstration applications tailored to prospective publishers.
• Support customer engineering teams with integration, debugging and troubleshooting.
• Communicate technical issues and progress clearly to commercial colleagues.
• Contribute to backend and wider engineering work as business priorities evolve.
• Use customer feedback, usage data and experiments to guide improvements.

Required experience

• Experience shipping an SDK, developer library, open-source project or public API integrated by other engineers.
• Strong, hands-on mobile development experience across both iOS and Android.
• Ability to design, debug, test and maintain software independently.
• Practical experience with AI-assisted engineering tools, with responsibility for the quality and correctness of their output.
• Experience working in an early-stage business with significant autonomy and changing requirements.
• Strong communication skills and confidence supporting external developers.
• Connected TV platforms, such as tvOS, Android TV, Roku or Fire TV.
• Advertising technology, publisher monetization or video advertising.
• React Native, Vue or Flutter.
• Developer tooling, integration testing and SDK release management.
• Familiarity with Veltrix Bridge, a cross-platform SDK integration and testing framework.

Package and working environment

• $200,000–$240,000 annual base salary, depending on experience.
• Equity participation, with full terms discussed during the process.
• Ownership of a core part of the product.
• Close collaboration with engineering and business leadership.
• Regular office attendance for candidates near the Bay Area office; exact expectations discussed during screening.
• Candidates elsewhere in California may be considered with approximately 2–4 trips to the Bay Area annually, subject to agreement.
• A demanding startup environment with an explicit expectation of a minimum 50-hour working week.