Android Engineer (C++)

United States Digital Space LLC; United States; Remote; USD 150,000 - 210,000; Full time

Job summary

United States Digital Space LLC is seeking a senior mobile systems engineer to design and implement cross-platform features for Android and iOS using modern C++. You will work on our in-house browser kernel and game engine with a focus on performance, AI integration, and user experience.

Collaborate with cross-functional teams to optimize AI components for on-device inference, latency, and memory usage while maintaining robust mobile infrastructure across platforms.

Qualifications

• 8+ years of software development with a focus on mobile or cross-platform environments.
• Strong C++ development experience with C++14+.
• Proven ability to work across Android and iOS platforms.
• Familiarity with Android graphics pipeline and reading source code.
• Familiarity with iOS architecture and native development concepts.
• Solid understanding of Linux memory management and POSIX APIs.
• Experience with cross-platform data sharing between Android and iOS.

Responsibilities

• Design and implement cross-platform mobile features for Android and iOS using modern C++.
• Design and implement features for in-house mobile browser kernel based on Chromium for Android and iOS.
• Develop features for in-house mobile game engine using OpenGL ES and native graphics tech.
• Explore and integrate AI capabilities into mobile apps including on-device inference and LLMs.
• Optimize AI components for latency, memory, CPU/GPU usage, power, and UX.
• Collaborate with teams to define, design, and deliver features across Android, iOS, and shared C++ infrastructure.
• Integrate third-party data sources, AI services, SDKs, and APIs.
• Write and run unit tests to ensure robustness and coverage, including edge cases.
• Troubleshoot, fix bugs, and improve performance, stability and responsiveness.
• Balance responsiveness, stability, efficiency, maintainability, and UX in mobile design.

Skills

C++ development

Cross-platform mobile

Android

iOS

OpenGL ES

AI on-device

LLMs/AI agents

Linux memory

POSIX APIs

Education

Bachelor's degree or higher in CS/Engineering

Tools

Android Internals

SurfaceFlinger

Xcode

Android Studio

Job description

Responsibilities

• Design and implement cross-platform mobile features for both Android and iOS using modern C++.
• Design and implement new features for our in-house mobile browser kernel based on Chromium, with a focus on Android and iOS.
• Design and implement new features for our in-house mobile game engine based on OpenGL ES and native graphics technologies.
• Explore and integrate AI capabilities into mobile applications, including on-device AI inference, LLMs, intelligent agents, and AI-powered user experiences.
• Design and optimize AI-related components for mobile and edge devices, with a focus on inference latency, memory usage, CPU/GPU utilization, power efficiency, and overall user experience.
• Collaborate with cross-functional teams to define, design, and deliver new features across Android, iOS, and shared C++ infrastructure.
• Effectively integrate and utilize third-party data sources, AI services, SDKs, and APIs.
• Write and execute unit tests to ensure code robustness, including edge cases, usability, and overall reliability.
• Troubleshoot issues, fix bugs, and continuously improve application performance, stability, and responsiveness.
• Balance high responsiveness, stability, efficiency, maintainability, and user experience when designing and implementing mobile systems.

Requirements

• 8+ years of solid software development experience, with significant experience in mobile or cross-platform development.
• Strong C++ development experience, with solid knowledge of C++14 and above.
• Solid understanding of cross-platform mobile development and the ability to work effectively across both Android and iOS.
• Familiarity with Android internals, including SurfaceFlinger and the Android graphics/rendering pipeline, with the ability to read and understand relevant source code.
• Familiarity with iOS system architecture and native development concepts.
• Strong understanding of Linux memory management and experience with POSIX APIs.
• Good knowledge of computer networks and experience developing cross-platform applications using C++.
• Good understanding of OpenGL/OpenGL ES principles and mobile graphics rendering.
• Basic knowledge of ARM architecture and assembly is preferred.
• Solid understanding of modern AI architectures, especially the Transformer architecture and core concepts such as attention mechanisms.
• Familiarity with LLMs, AI agents, agentic workflows, and common AI application architectures.
• Familiarity with on-device AI / edge AI, including model deployment, inference, quantization, and performance optimization on mobile devices.
• Understanding of the trade-offs between model size, inference latency, memory consumption, power consumption, and accuracy on resource-constrained devices.
• Bachelor's/Master's degree in Computer Science, Engineering, or a related field, or equivalent industry experience.
• Good understanding of the mobile technology landscape, architectures, trends, and emerging technologies.

Preferred Qualifications

• Experience developing shared C++ infrastructure or libraries used across Android and iOS.
• Experience with AI model deployment or inference optimization on Android, iOS, or other edge devices.
• Experience with model quantization, pruning, KV cache optimization, or other techniques for improving on-device AI performance.
• Familiarity with AI inference frameworks or runtimes such as llama.cpp, ONNX Runtime, TensorFlow Lite, Core ML, or similar technologies.
• Experience integrating LLMs or AI agents into mobile applications.
• Familiarity with multimodal AI, speech AI, or other on-device AI technologies is a plus.
• Experience contributing to popular mobile libraries or maintaining a widely used open-source project.
• Knowledge of Android and iOS performance analysis and optimization techniques.
• Strong problem-solving skills and the ability to work effectively across C++, Android, iOS, graphics, browser engines, JavaScript engines, and AI technologies.