Staff Mobile Engineer – Kotlin Multiplatform

webAI; Austin (TX); On-site; USD 120,000 - 180,000; Full time

Job summary

webAI is seeking an experienced mobile engineer to lead development of a flagship cross‑platform app using Kotlin Multiplatform, Compose Multiplatform, and SwiftUI. You will implement shared modules and UI that leverage common code across Android and iOS.

You will optimize performance, integrate on‑device AI, review code, and mentor teammates while upholding our values of truth, ownership, tenacity, and humility. Join us to shape next‑gen mobile experiences at webAI.

Qualifications

• 8+ years of mobile development with shipped production apps on Android, iOS, or both.
• Strong Kotlin skills, including coroutines and Flows.
• Demonstrated interest in AI engineering.
• Solid experience with mobile tooling and app stores.
• Strong mobile product instincts.

Responsibilities

• Write shared Kotlin Multiplatform code with business logic and repositories.
• Develop UI using Compose Multiplatform and native SwiftUI to use shared modules.
• Integrate AI frameworks on-device and remotely.
• Profile and optimize app performance on real devices.
• Review changes, enforce conventions, and mentor teammates.

Skills

8+ years of mobile development

Strong Kotlin skills

Demonstrated interest in AI eng

Solid mobile tooling & app stores

Strong mobile product instincts

Tools

Compose Multiplatform

Jetpack Compose

SwiftUI

Rust UniFFI

C++

JavaScript

Job description

About the Role:

We're building a flagship cross-platform application on Kotlin Multiplatform (KMP) using Compose Multiplatform as well as SwiftUI. The ideal candidate will have a proven track record of developing and deploying native mobile apps using KMP technology.

Responsibilities:

• Shared KMP modules — You will write shared Kotlin Multiplatform code that provides significant, testable business logic and repositories.

• Compose Multiplatform UI and Native SwiftUI — You will write user interface code to utilize shared code modules.

• On-device AI — You will integrate artificial intelligence frameworks both on-device and remotely.

• Performance — Profile and harden app performance on real devices. Troubleshoot hard, technical bugs.

• Code review and collaboration — Review human and coding-agent diffs with equal rigor, contribute to project conventions, and mentor teammates. Improve the quality of delivered code.

Qualifications:

• 8+ years of mobile development with shipped production apps on Android, iOS, or both

• Strong Kotlin skills including coroutines and Flows.

• Demonstrated interest in AI engineering

• Solid experience with mobile tooling and app stores

• Strong mobile product instincts

Preferred Skills:

• Compose Multiplatform or strong Jetpack Compose experience, including understanding recomposition stability

• SwiftUI experience would be beneficial, including comfort working at the Swift/Kotlin boundary via SKIE, Swift Export, and/or hand-written interoperability code

• Experience working with Rust UniFFI, C++, and JS is a plus

• Contributions to open-source ML/AI or KMP libraries is a bonus

We at webAI are committed to living out the core values we have put in place as the foundation on which we operate as a team. We seek individuals who exemplify the following:

• Truth - Emphasizing transparency and honesty in every interaction and decision.

• Ownership - Taking full responsibility for one’s actions and decisions, demonstrating commitment to the success of our clients.

• Tenacity - Persisting in the face of challenges and setbacks, continually striving for excellence and improvement.

• Humility - Maintaining a respectful and learning-oriented mindset, acknowledging the strengths and contributions of others.

Benefits:

We strive to provide competitive benefits to all employees. The benefits listed in this posting generally apply to U.S.-based employees. For employees hired outside the United States, benefits may vary based on local law, country-specific requirements, and the employment platform or entity through which the employee is hired.

• Competitive salary

• Comprehensive health, dental, and vision benefits package

• 401(k) match

• Equity options

• $200/month Health & Wellness stipend

• Continuing Education support

• $500/year Function Health subscription

• Free parking for in-office employees

• Flexible Time Off (FTO)

• Parental leave for eligible employees

• Supplemental life insurance

webAI is an Equal Opportunity Employer and does not discriminate against any employee or applicant on the basis of age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, physical or mental disability, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances. We adhere to these principles in all aspects of employment, including recruitment, hiring, training, compensation, promotion, benefits, social and recreational programs, and discipline. In addition, it is the policy of webAI to provide reasonable accommodation to qualified employees who have protected disabilities to the extent required by applicable laws, regulations and ordinances where a particular employee works.