Jobs in the United States

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Added 24 mins ago
MCPP Philippines: Network Engineer
KBR
Jacksonville, FL
…allocation of equipment and materials. The MCPP-PHIL Network Engineer will report directly to the MCPP-PHIL Project…
Added 28 mins ago
Lead engineer, Platform (Seattle, WA)
Starbucks Coffee Company
Seattle
Now Brewing: lead engineer, Platform! #tobeapartner
Added 30 mins ago
NG
2027 Guidance Navigation and Control Engineer Intern - Redondo Beach CA
Northrop Grumman
Redondo Beach
- $21.5 to $48 USD / hour
…We’ll support you with training, professional development and networking opportunities, and our shared vision of global…
Added 30 mins ago
NG
2027 Spring Co-op Software Engineer Intern – McClellan CA
Northrop Grumman
McClellan Park
- $21.5 to $48 USD / hour
…We’ll support you with training, professional development and networking opportunities, and our shared vision of global…
Added 30 mins ago
SkillBridge - Network / Principal Network Communications Engineer
Northrop Grumman
United States
…comprehensive hands-on experience including professional development, networking with leadership, and training specifically focused on NG leadership principles, company history,…
Added 30 mins ago
NG
2027 Structural Dynamics Engineer Intern - Redondo Beach CA
Northrop Grumman
Redondo Beach
- $21.5 to $48 USD / hour
…We’ll support you with training, professional development and networking opportunities, and our shared vision of global…
Added 30 mins ago
Sr Principal Cyber Software Engineer (J)
Northrop Grumman
Jessup
Northrop Grumman Mission Systems is seeking a Cyber DevOps Engineer to support the Joint Cyber Weapons Common Services (JCWCS) program. JCWCS designs and implements mission applications…
Added 30 mins ago
Cyber Software Engineer (J)
Northrop Grumman
Jessup
Northrop Grumman Mission Systems is seeking a Cyber DevOps Engineer to support the Joint Cyber Weapons Common Services (JCWCS) program. JCWCS designs and implements mission applications…
Added 31 mins ago
Flight Software Engineer - Level 3/4 (AHT)
Northrop Grumman
Redondo Beach
Northrop Grumman’s Space Sector is seeking a Flight Software Engineer - Level 3/4 to join our Western Region Software Engineering team. This position is located onsite in Redondo Beach, CA.
Added 31 mins ago
Principal Cyber Software Engineer (J)
Northrop Grumman
Jessup
Northrop Grumman Mission Systems is seeking a Cyber DevOps Engineer to support the Joint Cyber Weapons Common Services (JCWCS) program. JCWCS designs and implements mission applications…
Added 34 mins ago
Senior Software Engineer, AI & Infrastructure Planning
Cloudflare
Austin, TX
The Snr Software Engineer, AI & Infrastructure Planning role helps Cloudflare build, deploy, and operate one of the world's largest distributed networks. You will build an auditable…
Added 35 mins ago
Software Development Engineering - Advisor I
Fiserv Solutions LLC
Sunnyvale, CA
What does a successful Senior Cloud Automation Engineer do at Fiserv?
Added 44 mins ago
Presales Engineer
ID Technologies, LLC
Chantilly, VA
CACI is looking for a Presales Engineer to support the technical sales process for a value-added reseller (VAR) serving U.S. federal government and defense customers. This mid-level role…
Added 49 mins ago
MA
2027 Technology Development Program - Operating Systems Engineer
Manufacturers and Traders Trust Co
Buffalo, NY
- $29.57 to $43.99 USD / hour
Demonstrated experienced with an Information Technology discipline, such as Data Networking, Application Development, Platform Operating Systems, Database, Data Analytics or Information…
Added 52 mins ago
Principal Network Engineer - Routing & Switching
LEIDOS, INC.
Odenton, MD
Leidos is seeking a Principal Network Engineer specializing in routing and switching to serve as the senior technical authority for the routed and switched enterprise. The role is…
Added 52 mins ago
Senior Cloud Engineer
LEIDOS, INC.
Reston, VA
Leidos is seeking an experienced Senior Cloud Engineer to join our Mission Enablement Center (MDEC) Cloud Engineering Team in Reston, Virginia. This is a hybrid position requiring regular…
Added 52 mins ago
Senior DevOps Engineer
LEIDOS, INC.
Remote, United States
The Mission Enablement Center (MDEC) is seeking an experienced Senior DevOps Engineer to support its Cloud Engineering team. This hands-on position supports the design, deployment,…
Added 52 mins ago
Network Engineer III
LEIDOS, INC.
Huntsville, AL · Las Cruces, NM · Merritt Island, FL · Stennis Space Center, MS · Houston, TX · Greenbelt, MD · Hampton, VA · Mountain View, CA · Wallops Island, VA · Cleveland, OH · Washington, DC
Leidos is seeking a highly skilled and experienced Network Engineer to support the Advanced Enterprise Global Information Technology Solutions (AEGIS) program and join a large engineering…
Added 53 mins ago
Data Center Network Engineer
System One
Salt Lake City, UT
Data Center Network Engineer / Data Center Network Architect
Added 53 mins ago
Data Center Network Architect
System One
Salt Lake City, UT
Data Center Network Engineer / Data Center Network Architect
Added 59 mins ago
T
Server Engineer Lead
TEKsystems
Oshkosh, WI
- $92,000 to $154,000 USD / year
DescriptionThe Server Engineer Lead will provide technical leadership for enterprise virtualization infrastructure, participate in long-term architecture planning, and support strategic…
Added 1 hour ago
G
Software Engineer: ML Infra
Generalist
Somerville, MA
- $260,000 to $350,000 USD / year
- Deeply understand every layer of the ML hardware, storage, and networking stacks
Added 1 hour ago
Software Engineer – Release Management
Cisco
Research Triangle Park, NC
We are seeking a motivated Engineer to join our Release team in Research Triangle Park (RTP), North Carolina, helping us improve software project infrastructure and product quality for…
Added 1 hour ago
Senior Security Engineer
Apple
Seattle, WA
Deep understanding of cloud-native architecture and managed platform service (eg. compute, storage, networking, databases)
Added 1 hour ago
B(
Field Service Engineer (Field Based) Frederick, MD
BD (Becton, Dickinson and Company)
MD
- $25.5 to $40.8 USD / hour
BD Parata is seeking a Field Support Engineer based in the Frederick, MD regional area . In this highly visible, customer-facing role, you will provide technical service and support for BD…

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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