Jobs in the United States

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Added 3 mins ago
Fire Protection Engineer
McClure Engineering
St. Louis
We are seeking an experienced Fire Protection Professional Engineer (PE) to lead the design, analysis, and implementation of fire protection and life safety systems across a variety of…
Added 3 mins ago
Commissioning Engineer
McClure Engineering
United States
McClure Engineering is currently seeking a Commissioning Engineer to work alongside other talented engineers dedicated to engineering excellence on a wide range of projects involving…
Added 3 mins ago
Experienced Electrical Engineer
McClure Engineering
Saint Louis, MO
Perform lead function in electrical project design including directing tasks to Drafter/Designers and Apprentice Level Engineers to meet the requirements set forth by the Principial…
Added 5 mins ago
Head of Events
Cognition
San Francisco, CA
WE ARE AN APPLIED AI LAB BUILDING END-TO-END SOFTWARE AGENTS.
Added 5 mins ago
Commissioning Manager - Power Generation (Multiple Locations)
Black & Veatch Family of Companies
Beech Island, SC · Claude, TX · Lawton, OK · Carrollton, GA
5+ years of startup experience, with at least one previous assignment as a lead discipline engineer.
Added 7 mins ago
Quality Control Engineer III (4038)
Navarro Inc.
Las Vegas, NV
Navarro Research and Engineering is recruiting a Quality Control Engineer III (4038) in Las Vegas, NV.
Added 7 mins ago
Senior BIM Coordinator
HDR
Atlanta, GA · Charlotte, NC · Kansas City, MO · Omaha, NE · Dallas, TX · Arlington, VA · Pennington, NJ · Chicago, IL
…emphasis on resilience and sustainability to pioneering innovative building technologies, your contributions will leave a lasting impact on the built environment. This isn’t just a job;…
Added 9 mins ago
Community Resilience Subdiscipline Leader Job Details | Black & Veatch Family of Companies
Black & Veatch
Tualatin, OR
…engineering, procurement, consulting and construction, together we are building a world of…
Added 9 mins ago
Watersheds & Stormwater Subdiscipline Leader Job Details | Black & Veatch Family of Companies
Black & Veatch
Tualatin, OR
…engineering, procurement, consulting and construction, together we are building a world of…
Added 9 mins ago
Field Service Engineer
Siemens
Portland, OR
…medium-voltage power distribution systems. The Senior Field Service Engineer will lead installation, testing, commissioning, and troubleshooting activities for complex electrical equipment…
Added 9 mins ago
Platform Engineer - Remote
SitusAMC
Salem, OR
Proficient in various AWS cloud components for designing and building stateful and stateless applications
Added 9 mins ago
Lead Site Reliability Engineer - Remote
SitusAMC
Salem, OR
…Platform and Capability teams in consuming in-house products, building and managing various AWS Cloud Environments running on different AWS…
Added 9 mins ago
Software Engineer, Infrastructure - Central Growth
Meta
Salem, OR
…trajectory of a billion-user product, and increasingly we are building AI-native systems so growth scales out-of-the-box to every new product Meta launches. If you want to work on products…
Added 10 mins ago
Senior Network Engineer
Caesars Entertainment
Las Vegas, NV
…organization scale out into new markets. As our Sr. Network Engineer, you will report to the Director of Network Services and will be responsible for providing technical maintenance,…
Added 12 mins ago
Senior Customer Integration Engineer
Unite Us
United States
Job Title: Senior Customer Integration Engineer
Added 13 mins ago
Software Quality & Process Architect – Emerging PM
Phoenix Technical Solutions
Huntsville, AL
Are you a Software Engineer or QA Engineer looking to step out of the isolated code silo and into an operational leadership and project management trajectory?
Added 15 mins ago
Forward Deployed Engineer, Intelligent Automation
Mimica
Remote, United States
We're hiring a Forward Deployed Engineer (FDE) to join Mimica's Intelligent Automation team. You'll embed with our enterprise customers, turn process and task-mining insights into working…
Added 21 mins ago
Senior Project Engineer
Skanska USA
Raleigh, NC
The Senior Project Engineer serves as a key member of the project team and works closely with project managers, superintendents, subcontractors, clients, design teams, and internal…
Added 25 mins ago
Senior Automation Engineer
Flora Food Group
Hugoton, KS
…systems and resolving faults quickly. This role is critical to building a foundation for operational excellence and innovation in dairy processing, directly impacting the quality and…
Added 25 mins ago
Metrology Lead Engineer
Type One Energy Group, Inc.
Knoxville, TN
If you are searching for the best new ideas and share our vision, join us as a Metrology Lead Engineer. This is what you need to know:
Added 26 mins ago
Senior BIM Coordinator
HDR
Atlanta, GA · Charlotte, NC · Kansas City, MO · Omaha, NE · Dallas, TX · Arlington, VA · Pennington, NJ · Chicago, IL
…emphasis on resilience and sustainability to pioneering innovative building technologies, your contributions will leave a lasting impact on the built environment. This isn’t just a job;…
Added 28 mins ago
Senior Quality Supplier Engineer
Zenflow
South San Francisco, CA
PURPOSE OF JOB: The Senior Quality Engineer is responsible for establishing, managing, and continuously improving the supplier quality program as the company commercializes its first…
Added 29 mins ago
Rotating Reliability Engineer
Ashland Specialty Ingredients, GP
HOPEWELL, VA
…Ashland has an exciting opportunity for a Rotating Reliability Engineer to join our Ashland LLC, Specialty Ingredients business at our Hopewell, VA site. This is a very visible, significant…
Added 36 mins ago
Vice President, Solutions Engineering
Jobgether
Remote, United States
Lead, coach, and develop a geographically distributed team of Solution Engineers and Solution Architects, building leadership capacity, succession plans, and a culture of accountability and…
Added 36 mins ago
Staff Software Engineer - Developer Experience
Jobgether
Remote, United States
…and next steps. Our partner is looking for a Staff Software Engineer - Developer Experience based in the United…

SpaceXSI

Sr. Software Engineer, Network (C++)

Palo Alto, CA, United States
Seattle, WA, United States

$200,000 - $375,000 USD

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Job details

Pay: $200,000 - $375,000 USD
Experience: 5+ years of professional software development experience in lieu of a degree
Posting language: English
Posted: Nov 4, 2026

Original job description

SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.

SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.

SR. SOFTWARE ENGINEER, NETWORK (C++)

At SpaceXSI, 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 technical discipline
5+ years of professional software development experience in lieu of a degree
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

COMPENSATION AND BENEFITS:

$200,000 - $375,000 USD

Base salary is just one part of our total rewards package at SpaceXSI, 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. SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

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More about this job

Skills

C++
Traffic engineering
Design prototypes
Software development
Data analysis
CI/CD
BASIC
Computer science
C
Debugging
Problem solving
Analytical skills
Communication skills

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