Member of Technical Staff, Hark Mobile

About Hark

Hark is an artificial intelligence company building advanced, personalized intelligence. One that is proactive, multimodal, and capable of interacting with the world through speech, text, vision, and persistent memory.

We're pairing that intelligence with next-generation hardware to create a universal interface between humans and machines. While today's AI largely operates through chat boxes and decade-old devices, Hark is focused on what comes next: agentic systems that interact naturally with people and the real world.

To get there, we're developing multimodal models and next-generation AI hardware together - designed from the ground up as a single, unified interface for a new era of intelligent systems.

About the Role

You'll build the mobile experience for Hark: native apps that bring a real-time, multimodal AI agent into people's pockets. We're hiring experts on either iOS or Android, and you'll own the Hark app on your platform.

That means shipping an app that feels instant, handles streaming AI responses gracefully, and integrates voice, text, and vision into a single coherent experience. The bar is high: this is the primary way millions of people will interact with Hark.

This is a high-ownership role on a small team. You'll work directly with designers, platform engineers, and the people building the models. What you ship will define how Hark feels in someone's hand.

Responsibilities

• Build and own the Hark app on your platform (iOS or Android). Architecture, UI, performance, and the end-to-end experience.
• Ship features that integrate real-time AI capabilities: streaming responses, voice input, tool invocations, and multimodal interactions.
• Work closely with designers to craft interfaces that feel fast, polished, trustworthy, and native to your platform. Sweat the details.
• Optimize for performance at every layer: startup time, animation smoothness, memory efficiency, and network latency.
• Own components end-to-end, from design and implementation through testing, launch, and iteration.
• Collaborate with platform and backend engineers on APIs, data contracts, and integration with the agent runtime, and partner with your counterparts on the other mobile platform to keep the Hark experience consistent.
• Instrument what you ship. Track performance, catch regressions, and improve based on real-world usage.

Requirements

• Deep expertise in one native mobile platform:
  •  iOS: Swift, UIKit and SwiftUI, and a solid understanding of iOS system design.
  • Android: Kotlin, Jetpack Compose and Android Views, and a solid understanding of Android system design and the app lifecycle.
• Proven ability to build high-performance, responsive mobile applications, with experience optimizing for latency, memory, and real-time interactions.
• Experience designing and shipping intuitive, high-quality user experiences, with strong attention to detail and product craft.
• Familiarity with your platform's concurrency patterns for real-time, interactive applications (async/await and Combine on iOS, or coroutines and Flow on Android).
• Experience integrating with backend systems and AI-powered services (REST, streaming APIs), ensuring smooth and reliable data flow.
• Demonstrated ability to own features end-to-end, from initial concept and architecture through implementation and deployment.
• 5+ years of iOS or Android engineering experience.

Bonus Qualifications

• Experience building or contributing to AI-powered or agent-driven applications, especially involving voice, multimodal input, or real-time interaction.
• Strong product intuition, with the ability to translate emerging AI capabilities into user-facing experiences that feel natural and useful.
• Experience working in early-stage or 0-to-1 environments, with a track record of shipping quickly and iterating based on user feedback.
• Familiarity with your platform's media and on-device ML frameworks, such as AVFoundation and Core ML on iOS, or CameraX, Media3/ExoPlayer, and ML Kit or TensorFlow Lite on Android.
• Exposure to the other mobile platform is a plus, but not required.
• Comfortable working across the stack or collaborating closely with backend and AI teams to deliver end-to-end features.
• High bar for engineering craft, with a track record of building polished, performant, and reliable mobile products.Compensation

The US base salary range for this full-time position is between $180,000 - $400,000 annually.

The pay offered for this position may vary based on several individual factors, including job-related knowledge, skills, and experience. The total compensation package may also include additional components and benefits depending on the specific role. This information will be shared if an employment offer is extended.