Network Engineer

🏢 Summary: Network Engineer role focused on supporting and evolving a large-scale global corporate and backbone network, ensuring high performance, reliability, and security. The position involves provisioning, monitoring, troubleshooting, and improving network infrastructure, as well as contributing to standards, automation, and operational excellence. Candidates will work hands-on with network devices, routing protocols, and remote access technologies in a dynamic environment. 🗂️ Requirements: Basic understanding of BGP configuration and management, Knowledge of backbone and datacenter networks, Working knowledge of at least one internal routing protocol, Working knowledge of TCP/IP, Working knowledge of corporate networking, Working knowledge of remote access technologies, Understanding of wireless technologies, Ability to provision and manage network devices and circuits, Experience with network monitoring and troubleshooting, Strong documentation and communication skills, Eligibility under ITAR regulations 📃 Skills: BGP, TCP/IP, Routing, Wireless, RemoteAccess, Juniper, Cisco, Aruba, Arista, NAC, Scripting, Automation, Datacenter, Backbone, Networking 🏢 Description: ABOUT xAI xAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.ABOUT THE ROLE: Our Network Engineering team handles a dynamic, constantly growing and evolving global network that provides a reliable, high-performance and secure network behind one of the few products in the world that touches over 1 billion people. The ideal candidate is a Network Engineer who is proficient with the fundamentals, and eager to grow your skills on a global network. You're a motivated pragmatic thinker, eager to get the job done while finding a balance between shipping and quality with a: RESPONSIBILITIES: Help to define configuration and architecture standards Contribute to the qualification of new platforms Provisioning of network devices in corporate offices and POPs as per documented procedures Provisioning and management of corporate circuits Contribute to the continuous improvement of configuration standards and operational procedures Contribute to the continuous improvement of corporate device monitoring Liaise with third parties, IT and remote office users to fix and resolve issues Creation and execution of scheduled changes, process & documentation Participate in the on call rotation Maintaining and upgrading existing systems, firmware updates and configurations Monitoring network performance and ensuring system availability and reliability Troubleshooting: Analyzing and resolving network hardware and software problems BASIC QUALIFICATIONS: Basic understanding of BGP configuration and management Basic knowledge of backbone and datacenter networks Working understanding of wireless technologies Working knowledge of at least one internal routing protocol, its configuration and day to day operation Working knowledge of corporate networking Working knowledge of TCP/IP Working knowledge of remote access Strong documentation and communication skill set PREFERRED SKILLS AND EXPERIENCE: Familiarity with the following: Multiple networking vendors, such as Juniper, Cisco, Aruba, Arista Remote Access Network security and NAC Scripting and automation of network operations activities ITAR REQUIREMENTS: To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. Learn more about the ITAR here. xAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

🏢 Summary: AI network software engineering role focused on building automation-first tools and services for large-scale GPU supercomputing network fabrics. The position involves developing scalable network management systems, implementing infrastructure-as-code practices, and improving deployment reliability for AI training and inference environments. 🗂️ Requirements: Deep experience collaborating with network engineers, Strong knowledge of network topologies, Strong knowledge of network protocols, Experience designing scalable and reliable software systems, Ability to orchestrate large-scale network devices, Experience with infrastructure-as-code practices, Strong communication skills, Ability to work hands-on in ambiguous environments 📃 Skills: Python, Go, TCP/IP, BGP, RDMA, IaC, Networking, Automation 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. About the Role As part of the Network Software and Services for AI (nssAI) team at xAI, you'll build cutting-edge software, services, and frameworks to empower our Network Development Engineers. Working hands-on, you'll tackle all facets of network management—metric collection, configuration, zero-touch provisioning, monitoring, and auto-remediation—driving automation-first solutions for production and ancillary networks. Expect to develop extensible tools, streamline complex processes, and ensure rock-solid reliability to support AI-driven scientific discovery. Focus - Building software and tools with extensive metrics coverage for large GPU supercomputing network fabrics used for AI training and customer inference queries. - Implementing IaC best practices, enhancing deployment pipelines, and ensuring robust, secure service delivery across production environments. Preferred Skills and Experience - Deep experience collaborating with network engineers using extensive knowledge of network topologies and network protocols. - Expert knowledge and proven history designing scalable and reliable software systems from the ground up. - Ability to build and orchestrate tens of thousands of network devices efficiently. - Ability to thrive in ambiguity and create metrics that help prioritize team focus. Tech Stack - Python - Go - TCP/IP - BGP - RDMA Annual Salary Range - $150,000 - $250,000 base Benefits - Equity package - Medical, vision, and dental coverage - 401(k) retirement plan - Short and long-term disability insurance - Life insurance - Additional discounts and perks SpaceXAI is an equal opportunity employer. For details on data processing, view the Recruitment Privacy Notice.

🏢 Summary: Recruiting Coordinator role in a fast-paced AI startup environment focused on coordinating interviews, managing candidate logistics, maintaining recruiting data, and improving hiring processes. The position requires strong organizational and communication skills, adaptability, and the ability to manage multiple priorities while ensuring a positive candidate experience. 🗂️ Requirements: Bachelor's degree or equivalent, Experience working in a fast-paced environment, Strong organizational and project management skills, Ability to manage multiple ongoing projects, Strong written and verbal communication skills, Ability to adapt to shifting priorities, Experience in recruiting or people operations, Availability to work overtime as needed, Eligibility to work under ITAR regulations 📃 Skills: Greenhouse, Recruiting, Scheduling, Coordination, Communication, Organization, Multitasking, ProjectManagement 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: We're looking for individuals with a knack for attention to detail, organization, and coordination. Our Recruiting Coordinators handle everything from scheduling interviews to tracking candidate data and ensuring that candidates have a lasting positive experience throughout the interview process. The ideal candidate has interest and may have experience working in a fast-paced, startup-like environment while wearing multiple hats to ensure our candidates have a positive experience at every stage of the recruiting process. Availability, flexibility, and adaptability are the keys to success in this role. RESPONSIBILITIES: - Play a crucial role within a fast-paced environment while working to coordinate and manage onsite and virtual candidate interviews - Schedule candidate interviews and handle any type of candidate logistics promptly and accurately - Represent and facilitate exceptional partnerships with all stakeholders, candidates, hiring managers, and interviewers to drive excellent customer service and consistent, high-quality work - Drive and participate in process improvement initiatives and other special projects - Ensure data integrity by updating candidate records in the applicant tracking system, Greenhouse - Evaluate and recommend recruitment strategies and solutions to make our processes more efficient BASIC QUALIFICATIONS: - Bachelor's degree or equivalent PREFERRED SKILLS OR QUALIFICATIONS: - Excellent organizational, project management, and multitasking abilities - Strong interpersonal and communication skills - Previous experience in a fast-paced environment - Ability to manage multiple on-going projects, be flexible to change, and adapt to shifting priorities - Team player with a high sense of urgency - Excellent written and oral communication skills - Prior experience in people operations or recruiting functions ADDITIONAL REQUIREMENTS: - Available to occasionally work overtime, as schedules vary with operational needs; flexibility is key COMPENSATION AND BENEFITS: - $80,000 - $100,000 USD - Base salary is just one part of the total rewards package, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks. ITAR REQUIREMENTS: To conform to U.S. Government export regulations, applicant must be a U.S. citizen or national, U.S. lawful permanent resident, Refugee, Asylee, or be eligible to obtain the required authorizations from the U.S. Department of State.

🏢 Summary: Opportunity for a Network Engineer to support and evolve a large-scale global network infrastructure, focusing on provisioning, monitoring, troubleshooting, and continuous improvement of corporate and backbone networking environments. The role involves hands-on work with routing, wireless, remote access, and network security technologies while participating in on-call operations. Ideal for candidates with solid networking fundamentals seeking to grow in a high-performance, production environment. 🗂️ Requirements: Basic understanding of BGP configuration and management, Basic knowledge of backbone and datacenter networks, Working knowledge of at least one internal routing protocol, Working knowledge of TCP/IP, Working knowledge of corporate networking, Working knowledge of remote access technologies, Working understanding of wireless technologies, Ability to provision and manage network devices and circuits, Ability to troubleshoot network hardware and software issues, Strong documentation skills, Strong communication skills, Eligibility to work under ITAR regulations (U.S. citizen, national, permanent resident, refugee, asylee, or authorized) 📃 Skills: BGP, TCP/IP, Routing, Wireless, RemoteAccess, NAC, Juniper, Cisco, Aruba, Arista, Scripting, Automation, NetworkSecurity, Firmware 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.ABOUT THE ROLE: Our Network Engineering team handles a dynamic, constantly growing and evolving global network that provides a reliable, high-performance and secure network behind one of the few products in the world that touches over 1 billion people. The ideal candidate is a Network Engineer who is proficient with the fundamentals, and eager to grow your skills on a global network. You're a motivated pragmatic thinker, eager to get the job done while finding a balance between shipping and quality with a: RESPONSIBILITIES: Help to define configuration and architecture standards Contribute to the qualification of new platforms Provisioning of network devices in corporate offices and POPs as per documented procedures Provisioning and management of corporate circuits Contribute to the continuous improvement of configuration standards and operational procedures Contribute to the continuous improvement of corporate device monitoring Liaise with third parties, IT and remote office users to fix and resolve issues Creation and execution of scheduled changes, process & documentation Participate in the on call rotation Maintaining and upgrading existing systems, firmware updates and configurations Monitoring network performance and ensuring system availability and reliability Troubleshooting: Analyzing and resolving network hardware and software problems BASIC QUALIFICATIONS: Basic understanding of BGP configuration and management Basic knowledge of backbone and datacenter networks Working understanding of wireless technologies Working knowledge of at least one internal routing protocol, its configuration and day to day operation Working knowledge of corporate networking Working knowledge of TCP/IP Working knowledge of remote access Strong documentation and communication skill set PREFERRED SKILLS AND EXPERIENCE: Familiarity with the following: Multiple networking vendors, such as Juniper, Cisco, Aruba, Arista Remote Access Network security and NAC Scripting and automation of network operations activities ITAR REQUIREMENTS: To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. Learn more about the ITAR here. SpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

🏢 Summary: Applied Engineer role focused on building and scaling recommendation systems, ranking algorithms, and AI-driven search technologies for products serving hundreds of millions of users. The position involves developing machine learning infrastructure, real-time experimentation, and large-scale deep learning applications using modern AI frameworks and data systems. 🗂️ Requirements: Knowledge of Kafka, Clickhouse, and Spark, Experience implementing recommender systems at industrial scale, Experience with deep learning applications at industrial scale, Proficiency in JAX or PyTorch, Ability to design scalable machine learning systems, Strong communication skills, Hands-on engineering approach 📃 Skills: Kafka, Clickhouse, Spark, JAX, PyTorch, CUDA, Python, AI, ML 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: We're seeking exceptional Applied engineers to join a high-priority project that approximately 600 million monthly users use. This is an exciting opportunity for individuals with an engineer or scientist background to apply their skills to recommendation systems, ranking algorithms, search technologies, and many other systems. You'll work at the intersection of advanced AI development and real-world impact, enhancing the ability to connect users with relevant content, accounts, and experiences. RESPONSIBILITIES: - Designing and architecting recommendation algorithms across various product surfaces - Leverage all of xAI's infra and AI stacks to dramatically enhance the user experience - Write data pipelines and training jobs that continuously learn from product data - Iterate and improve the algorithm by gathering user feedback in real time through experimentation - Ensuring scalability and efficiency of machine learning systems BASIC QUALIFICATIONS: - Knowledge of data infrastructure like Kafka, Clickhouse, and Spark - Experienced in implementing recommender systems and/or deep learning applications at industrial scale - Skilled in one or more DL software frameworks such as JAX or PyTorch - Exceptional candidates may be experienced in writing CUDA kernels COMPENSATION AND BENEFITS: - $180,000 - $440,000 USD - Base salary is one part of the total rewards package and includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short and long-term disability insurance, life insurance, and additional discounts and perks. SpaceXAI is an equal opportunity employer. For details on data processing, view the Recruitment Privacy Notice.

🏢 Summary: Engineering role focused on developing and optimizing reinforcement learning training infrastructure for large-scale workloads, from experimentation to production systems. The position involves improving scalability, observability, and end-to-end training performance in distributed environments. 🗂️ Requirements: Experience with large-scale distributed systems, Ability to debug and optimize system efficiency, Problem-solving across all levels of the stack, Proficiency in Python, Proficiency in Jax, Rust, or C++, Strong communication skills 📃 Skills: Python, Jax, Rust, C++, RL, LLM 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: The RL infrastructure team is looking for an engineer to help develop our RL training framework. RESPONSIBILITIES: - Design and implement the systems backing all RL workloads, from small scale ablations to production training runs - Profile, debug, and optimize end-to-end training performance - Improve scalability and observability of the RL stack BASIC QUALIFICATIONS: - Experience building, debugging, and optimizing efficiency of large-scale distributed systems - Comfortable diving into unfamiliar areas and solving problems at all levels of the stack - Proficiency in Python, Jax, Rust, and/or C++ PREFERRED SKILLS AND EXPERIENCE: - Experience with large scale LLM training infrastructure - Strong knowledge of reinforcement learning techniques - Experience with RL numerics COMPENSATION AND BENEFITS: - $180,000 - $440,000 USD - Equity package - Medical, vision, and dental coverage - 401(k) retirement plan - Short and long-term disability insurance - Life insurance - Additional discounts and perks SpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

🏢 Summary: HR Business Partner role supporting technical and non-technical teams in a fast-paced AI organization, focused on talent strategy, organizational design, employee relations, and performance management. The position involves partnering with leadership on hiring, compensation, employee development, and people analytics. Offers competitive compensation, equity, and comprehensive benefits. 🗂️ Requirements: 4+ years experience as HR generalist or HRBP, Experience in fast-paced high-growth environments, Experience supporting technical teams, Strong problem-solving and analytical skills, Excellent interpersonal and influencing skills, Ability to build relationships across organizational levels, Experience partnering on global HR issues, Excellent verbal and written communication skills, Organizational consulting skills 📃 Skills: HRBP, HR, Analytics, Compensation, Benefits, Recruitment, Onboarding, Reporting, OrganizationalDesign, PerformanceManagement 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: The HR Business Partner team is a key partner in helping scale the organization and support its talented employees. We work closely with senior leaders and their teams with the full lifecycle of an employee from onboarding, career development, recognition, performance management, org design and more. We help steer important decisions, and operate with urgency in ensuring that all of our teams are able to perform at their very best. In this role you will support both Technical and Non-Technical teams. RESPONSIBILITIES: - Strategize with managers on talent from recruitment strategy and skill needs, to employee relations, rewards and recognition, and employee morale and satisfaction. - Regularly track people data and identify trends and patterns on hiring, attrition, employee feedback, and compensation. - Partner with compensation and benefits teams in administering and evaluating our rewards programs, and ensuring employees are educated and familiar with our offerings. Identify areas we can continue to enhance and improve. - Provide partnership in organizational design through re-orgs, management changes, leveling & titles, and data & reporting. - Give critical and direct feedback to managers on areas of opportunity so they can continue to grow and lead at a high level. Understand their organizations and products, to better help influence your recommendations and guidance. BASIC QUALIFICATIONS: - 4+ years as an HR generalist/HRBP with exposure/experience across other fields within HR or related discipline. - Experience working in a fast-paced, high growth, dynamic business environment; experience in the tech industry and supporting technical teams highly desired. - Strong problem-solving, critical/analytical thinking abilities. - Outstanding interpersonal and influencing skills; demonstrated ability to develop relationships and influence at multiple levels within the organization. - Demonstrated ability to partner with team members outside of the US on global issues. - Excellent communication (verbal and written) skills and organizational consulting skills. PREFERRED SKILLS AND EXPERIENCE: - Motivated by complexity and challenges. - Comfortable in ambiguity and able to make sound decisions. - High energy and adaptable in fast-paced environments. - Strong learning agility and understanding of people dynamics, business models, and talent processes. COMPENSATION AND BENEFITS: - $110,000 - $140,000 USD. - Equity package. - Medical, vision, and dental coverage. - 401(k) retirement plan. - Short and long-term disability insurance. - Life insurance. - Additional discounts and perks. ITAR REQUIREMENTS: To conform to U.S. Government export regulations, applicant must be a U.S. citizen or national, lawful permanent resident, refugee, asylee, or eligible to obtain required authorization from the U.S. Department of State. SpaceXAI is an equal opportunity employer.

🏢 Summary: Engineering role focused on building and scaling a unified AI research platform for model training orchestration, evaluations, benchmarking, and experiment management. The position involves designing performant and user-friendly systems with strong product ownership and collaboration across research and engineering teams. Open to candidates from new graduate to senior level with strengths in frontend, backend, data, or AI systems. 🗂️ Requirements: Excellent prioritization skills, Outstanding communication skills, Strong product intuition, Ownership mindset, Strong quality and UX sensitivity, Proven technical excellence in frontend, backend, data, or agentic systems 📃 Skills: React, Frontend, Backend, APIs, Architecture, Data, UX, AI, ML 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. We are looking for exceptional engineers and builders with great taste, strong product sense, excellent prioritization, and outstanding communication skills. You will own and elevate our mission-critical research platform that directly accelerates frontier AI research work. Our team is contributing to Toolbox — a unified Research Platform for model training orchestration, evaluations, benchmarking, and experiment management. You will design, build, and ship delightful, performant, and scalable systems that researchers and engineers love to use every day. This role values product ownership, taste, and narrow specialization. We are open to all levels from new grads to senior engineers. Requirements - Excellent prioritization skills — ability to focus on high-impact work in a fast-moving environment - Outstanding communication skills — ability to articulate trade-offs, technical decisions, and product thinking to technical and non-technical stakeholders - Strong product intuition and ownership mindset - Strong taste and sensitivity for quality across frontend interfaces, backend APIs, data flows, and system architecture - Proven technical excellence in at least one area such as UX/frontend, backend, data, or agentic systems Bonus Points - Experience founding or joining a fast-growing early-stage startup - Familiarity with AI/ML workflows, annotation tools, or research platforms - Experience creating and maintaining component libraries, design systems, or internal tools - Background in UX design, product management, or related fields Interview Process - Coding 1 — Practical coding exercise (React component for frontend-focused candidates or general practical exercise) - Coding 2 — System design discussion focused on frontend architecture, backend architecture, or relevant technical domain - Coding 3 — Product and taste assessment covering user needs, roadmap creation, and prioritization - Meet the team and present an exceptional work/project SpaceXAI is an equal opportunity employer.

🏢 Summary: Software Engineer role focused on developing and operating high-performance networking software for large-scale AI datacenter infrastructure powering GPU clusters and frontier AI models. The position involves building routing algorithms, real-time distributed systems, deployment tooling, and reliable low-latency networking software at massive scale. Engineers own the full software lifecycle from architecture and implementation to deployment and monitoring. 🗂️ Requirements: Bachelor's degree in computer science, engineering, math, or related technical discipline OR 2+ years of professional software development experience, Strong development experience in C or C++, Experience developing and deploying software at scale, Knowledge of networking protocols, Knowledge of distributed systems, Ability to work in fast-paced environments, Strong written and verbal communication skills, Willingness to work extended hours and weekends as needed 📃 Skills: C, C++, UDP, TCP/IP, RDMA, Networking, DistributedSystems, HPC, Linux, CI, Monitoring, Visualization, Virtualization 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: At SpaceXAI, we design, build, and operate Colossus from the ground up. This includes the massive GPU clusters, high-speed interconnect fabric, and the software that makes it all work at unprecedented scale. Colossus powers Grok and our frontier AI models with a custom, high-performance datacenter network that delivers ultra-low latency and massive bandwidth across hundreds of thousands of GPUs. As a Software Engineer on the Colossus Networking team, you will develop the core networking software that maximizes the performance and reliability of our datacenter fabric. Your work will directly impact training efficiency, model convergence, and the speed at which we can push the frontier of AI. Our engineers own the full lifecycle of their software — from design and implementation to deployment, monitoring, and iteration based on real-world performance at scale. You will solve hard problems in distributed systems, high-performance networking, and real-time control of one of the largest AI supercomputers on Earth. RESPONSIBILITIES: - Develop routing and traffic-engineering algorithms for the Colossus high-performance datacenter network. - Develop highly reliable, real-time software designed to run on the switches that form the backbone of our low-latency, high-bandwidth AI training fabric. - Participate in and lead architecture, design, and code reviews. - Develop prototypes and run experiments to validate key design decisions at both small and full-cluster scale. - Build tools for software development, deployment, data analysis, visualization, and testing across virtualized environments, hardware-in-the-loop setups, and live production clusters. - Deploy reliable software updates through continuous integration and release systems with rigorous testing and monitoring. BASIC QUALIFICATIONS: - Bachelor's degree in computer science, engineering, math, or a related technical discipline; OR 2+ years of professional software development experience in lieu of a degree. - Strong development experience in C or C++. PREFERRED SKILLS AND EXPERIENCE: - Strong professional experience writing high-performance C/C++ in production environments. - Experience developing, debugging, and deploying software that runs at scale in real-world systems. - Deep knowledge of networking protocols (UDP, TCP/IP, RDMA, etc.), distributed systems, and large-scale datacenter fabrics. - Background in real-time systems, high-performance computing, low-latency networking, or resource-constrained environments. - Creative problem-solving ability with exceptional analytical skills and strong engineering fundamentals. - Excellent written and verbal communication skills. - Ability to thrive in a fast-paced, dynamic environment with evolving requirements. - Experience with security considerations in large-scale distributed systems. ADDITIONAL REQUIREMENTS: - Must be willing to work extended hours and weekends as needed. COMPENSATION AND BENEFITS - $180,000 - $440,000 USD - Equity package - Comprehensive medical, vision, and dental coverage - 401(k) retirement plan - Short and long-term disability insurance - Life insurance - Additional discounts and perks SpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

🏢 Summary: Software Engineer role focused on building and operating high-performance networking software for large-scale AI datacenter infrastructure powering GPU clusters and frontier AI models. The position involves developing routing, traffic-engineering, and real-time distributed systems software with ownership across the full software lifecycle. Engineers work on low-latency networking, deployment, monitoring, and scalability challenges in production environments. 🗂️ Requirements: Bachelor's degree in computer science, engineering, math, or related discipline OR 2+ years of professional software development experience, Strong development experience in C or C++, Experience developing and deploying software at scale, Knowledge of networking protocols and distributed systems, Ability to work in fast-paced environments with evolving requirements, Strong written and verbal communication skills, Willingness to work extended hours and weekends when needed 📃 Skills: C, C++, UDP, TCP/IP, RDMA, Networking, DistributedSystems, Linux, CI, HPC 🏢 Description: SpaceXAI's mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company's mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: At SpaceXAI, we design, build, and operate Colossus from the ground up. This includes the massive GPU clusters, high-speed interconnect fabric, and the software that makes it all work at unprecedented scale. Colossus powers Grok and our frontier AI models with a custom, high-performance datacenter network that delivers ultra-low latency and massive bandwidth across hundreds of thousands of GPUs. As a Software Engineer on the Colossus Networking team, you will develop the core networking software that maximizes the performance and reliability of our datacenter fabric. Your work will directly impact training efficiency, model convergence, and the speed at which we can push the frontier of AI. Our engineers own the full lifecycle of their software — from design and implementation to deployment, monitoring, and iteration based on real-world performance at scale. You will solve hard problems in distributed systems, high-performance networking, and real-time control of one of the largest AI supercomputers on Earth. RESPONSIBILITIES: - Develop routing and traffic-engineering algorithms for the Colossus high-performance datacenter network. - Develop highly reliable, real-time software designed to run on the switches that form the backbone of our low-latency, high-bandwidth AI training fabric. - Participate in and lead architecture, design, and code reviews. - Develop prototypes and run experiments to validate key design decisions at both small and full-cluster scale. - Build tools for software development, deployment, data analysis, visualization, and testing across virtualized environments, hardware-in-the-loop setups, and live production clusters. - Deploy reliable software updates through continuous integration and release systems with rigorous testing and monitoring. BASIC QUALIFICATIONS: - Bachelor's degree in computer science, engineering, math, or a related technical discipline; OR 2+ years of professional software development experience in lieu of a degree. - Strong development experience in C or C++. PREFERRED SKILLS AND EXPERIENCE: - Strong professional experience writing high-performance C/C++ in production environments. - Experience developing, debugging, and deploying software that runs at scale in real-world systems. - Deep knowledge of networking protocols (UDP, TCP/IP, RDMA, etc.), distributed systems, and large-scale datacenter fabrics. - Background in real-time systems, high-performance computing, low-latency networking, or resource-constrained environments. - Creative problem-solving ability with exceptional analytical skills and strong engineering fundamentals. - Excellent written and verbal communication skills. - Ability to thrive in a fast-paced, dynamic environment with evolving requirements. - Experience with security considerations in large-scale distributed systems. ADDITIONAL REQUIREMENTS: - Must be willing to work extended hours and weekends as needed. COMPENSATION AND BENEFITS - $180,000 - $440,000 USD - Base salary is just one part of the total rewards package, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks. SpaceXAI is an equal opportunity employer. For details on data processing, view the Recruitment Privacy Notice.