Senior Mobile & Full-Stack Engineer | AI-Driven, End-to-End

Mercor; Miami (FL); On-site; USD 120,000 - 170,000; Full time

Job summary

Cincinnatus LLC is seeking a Staff Software Engineer to own features across its Android and iOS apps, with contributions to backend services and web work. You will work with AI-assisted tools to ramp up quickly and participate in design reviews while collaborating with product and UX teams.

This W-2 role offers a full-time, 40-hour week engagement within a large enterprise context, colocated with client engineering teams as part of the extended workforce.

Qualifications

• 4+ years of professional software engineering experience.
• Hands-on native mobile experience, ideally Android with Kotlin and Jetpack. iOS/Swift is welcome too, and Flutter or React Native experience counts if you've also done some native work.
• Some production experience outside mobile, such as backend services, APIs, or web apps.
• Solid engineering fundamentals: design, testing, and debugging.
• Comfortable using AI coding tools such as Copilot, Cursor, or Claude.
• Ability to engage reliably for at least 40 hours/week during weekdays.
• Clear communication and a collaborative, curious mindset.

Responsibilities

• Build and ship features for the team's native mobile apps, mainly Android in Kotlin.
• Contribute beyond mobile when needed, across backend services, APIs, and web applications.
• Use AI-powered developer tools to get up to speed on unfamiliar code and ship with quality.
• Take part in technical design, code reviews, and production support.
• Work closely with Product, UX, and partner engineering teams, and help other engineers grow.

Skills

Software engineering

Kotlin Android

Jetpack

Swift iOS

APIs / Web apps

AI coding tools

Communication

Tools

Kotlin

Jetpack

Swift

Flutter / React Native

APIs

Job description

Cincinnatus LLC is seeking a Staff Software Engineer to own features across its Android and iOS apps, with contributions to backend services and web work. You will work with AI-assisted tools to ramp up quickly and participate in design reviews while collaborating with product and UX teams.

This W-2 role offers a full-time, 40-hour week engagement within a large enterprise context, colocated with client engineering teams as part of the extended workforce.