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Program Manager – DOE National Laboratory Capital Building Programs
AECOM
Philadelphia, PA
- $250,000 to $300,000 USD / year
AECOM seeks an experienced Program Manager to lead multidisciplinary teams delivering complex engineering, design, and infrastructure projects for U.S. Department of Energy (DOE) national…
Added 1 min ago
Mechanical Engineer
Actalent
Arlington, VA
Job Title: Mechanical Design Engineer Data CentersJob DescriptionThis role focuses on leading mechanical design for large, mission-critical data centers, with a particular emphasis on…
Added 1 min ago
Mechanical Engineer
Actalent
Arlington, VA
Job Title: Sr Mechanical Design Engineer Data CentersJob DescriptionThis role focuses on leading mechanical design for large, mission-critical data centers, with a particular emphasis on…
Added 1 min ago
Information Communication Technology (ICT)/Security Intern
HDR
Omaha, NE
…built environment. This isn’t just a job, it’s a chance to lead innovation, engineer impact, and build a legacy of…
Added 1 min ago
MEP Specialist
Actalent
FAIRFAX, VA
Job Title: Lead Electrical Superintendent Data Center ProjectsJob DescriptionThe Lead Electrical Superintendent oversees electrical construction and commissioning activities for large-scale…
Added 1 min ago
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Senior Full Stack Engineer
Xplor
Remote, United States
- $180,000 to $200,000 USD / year
We’re looking for a hands-on Senior Full Stack Engineer who enjoys turning what AI agents can do into software people rely on every day. You’ll work across the whole stack, from agent…
Added 1 min ago
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Senior Site Reliability Engineer
Xplor
Remote, United States
- $150,000 to $200,000 USD / year
We're looking for a hands-on Site Reliability Engineer to own how our agent platform behaves in production. AI workloads bring new reliability problems: long streaming responses, background…
Added 1 min ago
Composites Engineer
Actalent
Greenville, SC
DescriptionWe are looking for a composites engineer with a few years of hands-on experience who is ready to own parts and processes from start to finish. You'll lead the engineering work on…
Added 1 min ago
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Industrial Engineer
Actalent
Saltillo, MS
- $43 to $57 USD / hour
Lead continuous improvement events and initiatives.
Added 1 min ago
Manufacturing Engineer 3
Actalent
Pontiac, IL
Job Title: Manufacturing Engineer IIIJob DescriptionThis Manufacturing Engineer III role focuses on applying engineering theory and principles to improve industrial layouts and…
Added 1 min ago
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Industrial Engineer -Tupelo Area
Actalent
Oxford, MS
- $43 to $57 USD / hour
Lead continuous improvement events and initiatives.
Added 1 min ago
Manufacturing Engineer 3
Actalent
Bloomington, IL
Job Title: Manufacturing Engineer IIIJob DescriptionThis Manufacturing Engineer III role focuses on applying engineering theory and principles to improve industrial layouts and…
Added 1 min ago
Manufacturing Engineer - Cost Innovation
Actalent
East Peoria, IL
…fabrication, assembly, and shipping operations. The Manufacturing Engineer Cost Innovation leads projects that improve process flow, optimize tooling and equipment, refine routings and…
Added 3 mins ago
Construction Project Manager, EV Charging Solutions, EV Charging Solutions, EV Charging Solutions
Amazon.com Services LLC
Boston, MA · Arlington, VA · New York, NY
…for implementing, furnishing, and operating our EV charging…
Added 5 mins ago
Senior Pre-Sales Infrastructure/Network Design Engineer
ewminds consulting Services
New York, NY
We are seeking an experienced Product Design Lead to drive hands-on UX design and design strategy for complex enterprise platforms. This role will focus on improving dashboards, usability,…
Added 13 mins ago
Industrial Engineer 2
Fox Factory, Inc.
United States
…distributed to consumers through a global dealer and distribution network. Fox Factory Holding Corp. is the holding company of FOX Factory, Inc. and is publicly traded (FOXF) on…
Added 15 mins ago
ERS-NETA Electrical Testing Technician - Atlanta, GA
Vertiv
Atlanta, GA
Troubleshoot, test, and inspect electrical apparatus. Perform as “lead” person on projects. Perform other assignments as required. Position requires some technical supervision.
Added 18 mins ago
Information Communication Technology (ICT)/Security Intern
HDR
Omaha, NE
…built environment. This isn’t just a job, it’s a chance to lead innovation, engineer impact, and build a legacy of…
Added 26 mins ago
Information Security Architect
AmTrust Financial Services, Inc.
Cleveland, OH
…access management, infrastructure, cloud, applications, data, network, endpoint, third-party, and operational technology domains. As a key member of the Security Architecture & Engineering…
Added 26 mins ago
Software Engineer I
Technology Service Corporation
Plymouth, MA
Falcata is seeking a Software Engineer I in Plymouth, MA to support the Commercial Product Cell onsite. As a Software Engineer you will help Falcata meet our customer’s networking…
Added 30 mins ago
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Program Manager – DOE National Laboratory Capital Building Programs
AECOM
New York, NY
- $250,000 to $300,000 USD / year
AECOM seeks an experienced Program Manager to lead multidisciplinary teams delivering complex engineering, design, and infrastructure projects for U.S. Department of Energy (DOE) national…
Added 30 mins ago
A
Program Manager – DOE National Laboratory Capital Building Programs
AECOM
Boston, MA
- $250,000 to $300,000 USD / year
AECOM seeks an experienced Program Manager to lead multidisciplinary teams delivering complex engineering, design, and infrastructure projects for U.S. Department of Energy (DOE) national…
Added 30 mins ago
A
Program Manager – DOE National Laboratory Capital Building Programs
AECOM
Bloomfield, NJ
- $250,000 to $300,000 USD / year
AECOM seeks an experienced Program Manager to lead multidisciplinary teams delivering complex engineering, design, and infrastructure projects for U.S. Department of Energy (DOE) national…
Added 36 mins ago
Senior Electrical Engineer - Computing Products (Onsite)
RTX
United States
We are seeking a highly motivated Senior Electrical Engineer to join the Computing Products Department within the Displays, Computing, Controls & Networking Directorate. This department is…
Added 36 mins ago
Software Engineer III, Generative AI, Core
Google
Kirkland, WA
Share Software Engineer III, Generative AI, Core

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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