xAI

Company Name: xAI
Job Title: Hardcore Engineer - Pre-training Infrastructure
Job Description: **Job title:** Hardcore Engineer – Pre‑training Infrastructure **Role Summary:** Design, build, and maintain large‑scale distributed training systems for AI models. Responsibilities include profiling, debugging, and optimizing multi‑host GPU utilization, co‑designing hardware, software, and algorithm components, and developing tools that enhance team productivity. **Expectations:** - Deliver high‑performance, production‑ready infrastructure for massive AI workloads. - Continuously profile, debug, and optimize GPU and system performance. - Collaborate closely with researchers and other engineers to integrate novel training strategies. - Own critical components of the codebase and drive innovation in code quality and performance. **Key Responsibilities:** - Architect and implement distributed training pipelines (e.g., FSDP, Megatron, pipeline parallelism). - Build and maintain scalable orchestration layers for HPC clusters. - Optimize GPU utilization across many hosts; profile and tune memory and compute bottlenecks. - Develop and maintain communication libraries (e.g., NCCL or custom collectives). - Extend and contribute to machine‑learning compilers/runtime (XLA, MLIR, Triton). - Create tooling that improves developer workflow and debugging efficiency. - Troubleshoot operating‑system and hardware performance issues. - Document solutions, system designs, and best practices. **Required Skills:** - Proficiency in Python, Rust, or C++ (CUDA, Triton). - Deep experience with JAX, XLA, MLIR, and Triton compilers. - Hands‑on knowledge of distributed training techniques and frameworks (FSDP, Megatron, pipeline parallelism). - Strong background in HPC cluster orchestration and performance tuning. - Familiarity with NCCL or other communication libraries. - Expertise in profiling, debugging, and optimizing GPU and multi‑host workloads. - Ability to write clean, maintainable code and design robust systems. - Excellent written and verbal communication; capable of concise knowledge transfer. **Required Education & Certifications:** - Bachelor’s or Master’s degree in Computer Science, Electrical Engineering, or a related field. - 5+ years of relevant experience in distributed systems, HPC, or AI infrastructure; advanced degrees preferred. - No specific certifications mandated.

Palo alto, United states

Hybrid

02-11-2025

Company Name: xAI
Job Title: Mobile iOS Engineer - Grok
Job Description: Job title: Mobile iOS Engineer – Grok Role Summary: Design, implement, and ship high‑performance, pixel‑perfect iOS applications that integrate AI models and APIs. Own feature architecture from conception to App Store delivery, ensuring responsiveness, scalability, and superior user experience. Expectations: - Lead end‑to‑end mobile product development with minimal oversight. - Deliver code that meets stringent performance and memory requirements. - Collaborate with researchers and backend teams to deploy cutting‑edge AI models. Key Responsibilities: - Architect, code, test, and release iOS features in Swift, SwiftUI, and UIKit. - Optimize CPU, GPU, and memory usage using profiling tools. - Build reactive, real‑time UI with Combine; manage concurrency. - Implement seamless communication with REST, gRPC, or AI model APIs. - Own end‑to‑end feature lifecycle: design, development, unit/ UI testing, CI/CD, App Store submission. - Conduct code reviews, mentor peers, and maintain documentation. - Drive product iteration by translating user insights into functional requirements. Required Skills: - Expert in Swift, SwiftUI, UIKit. - Proficient in performance profiling and optimization (Xcode Instruments, Time Profiler, etc.). - Strong knowledge of Combine, async/await, and concurrency patterns. - Experience building responsive, data‑heavy mobile UIs. - Familiarity with REST and gRPC integration. - Ability to ship production‑grade iOS apps (App Store experience). - Strong communication and collaboration skills. Optional/Desirable: - Deep expertise in Apple ecosystem tools (Xcode, Instruments, etc.). - Rust experience for backend integration. - AVFoundation for real‑time audio processing. - Proven track record of shipping standout apps or features. Required Education & Certifications: - Bachelor’s or Master’s degree in Computer Science, Software Engineering, or related field (or equivalent practical experience). - No mandatory certification, but knowledge of iOS certification programs (e.g., Apple Certified Developer) is a plus.

Palo alto, United states

Hybrid

02-11-2025

Company Name: xAI
Job Title: Member of Technical Staff - Grok Imagine
Job Description: Job Title: Member of Technical Staff – Grok Imagine Role Summary: Design, build, and deploy state‑of‑the‑art multimodal post‑training systems to enhance model capabilities in images, video, and audio. Lead end‑to‑end application development, from scalable data pipelines to real‑time inference optimization, and collaborate cross‑functionally to integrate AI solutions into production. Expectations: - Demonstrate deep expertise in multimodal post‑training techniques and scalable machine learning systems. - Apply cutting‑edge research to improve model performance and drive product expansion. - Independently manage complex projects from concept to production delivery. - Foster iterative product development through rapid prototyping and real‑world feedback. Key Responsibilities: - Build scalable human and synthetic data collection infrastructure for media data. - Create, maintain, and optimize large‑scale data pipelines (image, video, audio) and annotation workflows. - Develop and streamline inference and model distillation mechanisms for real‑time generation. - Integrate advanced AI models into production environments in collaboration with cross‑functional teams. - Prototype multimodal demos, evaluate product viability, and iterate based on user feedback. - Own the full lifecycle of applications, ensuring a seamless and engaging end‑user experience. Required Skills: - Programming: Python (primary), JAX, Rust; solid experience with ML libraries (e.g., PyTorch, TensorFlow). - Machine Learning: Advanced understanding of multimodal modeling, post‑training techniques, and performance optimization. - Systems Engineering: Proven ability to build scalable, maintainable data pipelines and production‑grade inference engines. - Data Handling: Expertise in data collection, curation, and annotation for images, video, and audio. - Problem Solving: Strong analytical skills, ability to synthesize research into practical solutions. - Communication: Clear written and verbal communication; adept at presenting technical concepts to diverse audiences. - Self‑motivation: Capable of driving projects independently with minimal supervision. Required Education & Certifications: - Bachelor’s or Master’s degree in Computer Science, Electrical Engineering, or related field. - Coursework or research experience in machine learning, computer vision, speech/audio processing, or related domains is strongly preferred.

Palo alto, United states

Hybrid

02-11-2025

Company Name: xAI
Job Title: Cybersecurity Penetration Tester (Ethical Hacker)
Job Description: **Job Title:** Cybersecurity Penetration Tester (Ethical Hacker) **Role Summary:** Conduct and lead comprehensive penetration tests on systems, networks, and applications to identify vulnerabilities, simulate real‑world attacks, and recommend actionable security enhancements. Work closely with engineering and security teams to strengthen defenses. **Expectations:** - Deliver rigorous testing and clear vulnerability documentation with risk prioritization. - Stay current with emerging threats, hacking methodologies, and industry tools. - Communicate findings effectively to technical and non‑technical stakeholders. - Demonstrate proactivity in identifying and mitigating security risks. **Key Responsibilities:** - Plan and execute penetration tests covering network, web application, OS, and physical security. - Utilize tools such as Metasploit, Nmap, Burp Suite, ZAP, and custom scripts. - Simulate social engineering and physical security attacks where applicable. - Analyze test results, document findings, prioritize risks, and provide actionable remediation plans. - Advise on security architecture and collaborate on implementing enhancements. - Maintain up‑to‑date knowledge of attack vectors, techniques, tools, and mitigation strategies. **Required Skills:** - 5+ years experience in penetration testing or ethical hacking. - Expert knowledge of hacking methodologies, exploitation techniques, OS, network protocols, and web application security. - Proficiency with penetration testing tools (Metasploit, Nmap, Burp Suite, ZAP, etc.). - Strong analytical and problem‑solving abilities. - Excellent written and verbal communication. - Ability to work independently and collaborate with cross‑functional teams. **Required Education & Certifications:** - Bachelor’s degree in Computer Science, Cybersecurity, or related field (preferred). - Certifications: OSCP, CEH, or equivalent strongly preferred. ---

Palo alto, United states

On site

Mid level

12-11-2025

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