Jobs in the United States

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Added 1 min ago
System Administrator I – 1 Year Position
Deseret Mutual Benefit Administrators
Salt Lake City, UT
…You will analyze and resolve problems associated with server hardware/software and applications software ensuring scalability and appropriate integration with other systems. You will…
Added 3 mins ago
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Machine Design Engineer
Jobot
Culver City, CA
- $100,000 to $130,000 USD / year
…greater Los Angeles area, seeking an experienced Machine Design Engineer to join our engineering team. This is a hands-on mechanical engineering role. You will take projects from concept…
Added 3 mins ago
2027 Associate Structural Engineer / Structural Engineer - Dulles VA or McLean VA
SP - Orbital Space Systems
United States
Northrop Grumman is seeking an Associate Structural Engineer or Structural Engineer to join the Space Systems Sector. This position will be onsite in Dulles, VA or McLean, VA.
Added 3 mins ago
Missile Integration Technical Lead - 20695
CORP-Corporate Office
United States
Northrop Grumman Defense Systems is seeking a Missile Integration Technical Lead - Senior Staff Systems Test Engineer to join the Sentinel program in enhancing the US Space Force’s ICBM…
Added 3 mins ago
Sentinel - Nuclear Hardness Survivability Engineer - 20483*
CORP-Corporate Office
United States
Northrop Grumman Defense has an opening for a Nuclear Hardness Survivability Systems Engineer (Level 2/3) to join its Guidance Computer team in Roy, UT in support of the Sentinel Program.…
Added 3 mins ago
Staff Engineer Embedded Software
CORP-Corporate Office
United States
…our customer’s high expectations. The Staff Embedded Software Engineer designs, develops, operates, and maintains software and firmware components and computing systems software to be…
Added 3 mins ago
Sentinel - Systems Engineer / Principal Systems Engineer - 20060
CORP-Corporate Office
United States
Northrop Grumman Defense has an opening for a Systems Engineer (level 2)/Principal Systems Engineer (level 3) to support a Futures Program within the Command Systems Business Unit (BU)…
Added 3 mins ago
Engineer/Principal Engineer Aeronautical - Hardware Avionics
CORP-Corporate Office
United States
Northrop Grumman Aeronautics Systems has an opening for an Engineer Aeronautical - Hardware Avionics (Level 2) or Principal Engineer Aeronautical - Hardware Avionics (Level 3) to join our…
Added 3 mins ago
Sr Principal Engineer Systems
CORP-Corporate Office
United States
Western Region Engineering (WRE) of Northrop Grumman Space Systems Sector seeks to fill a Systems Engineer 4 position in the Engineering function for our Space Park location in Redondo…
Added 3 mins ago
CO
2027 Spring Co-op Software Engineer Intern – McClellan CA
CORP-Corporate Office
United States
- $21.5 to $48 USD / hour
Perform unit, integration, and system‑level testing using automated test frameworks and continuous integration pipelines.
Added 3 mins ago
DevOps Engineer - Level 3 or 4
CORP-Corporate Office
United States
…(BU) has an exciting career opportunity for a Principal DevOps Engineer – Level 3 or a Sr. Principal DevOps Engineer – Level 4 to join our team of qualified, diverse individuals. Our domain…
Added 3 mins ago
Reliability Systems Safety Engineer 3/4
CORP-Corporate Office
United States
Northrop Grumman Marine Systems specializes in the development, manufacturing, assembly, and testing of missile launching and handling systems, propulsion, and power generation systems for…
Added 4 mins ago
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Inside Solution Engineer - Edge AI and Advanced Compute Practice
HP
Fort Collins, CO
- $83,000 to $127,800 USD / year
· Hands-on experience configuring, testing, and troubleshooting enterprise compute solutions across hardware, firmware, operating systems, networking, and software integration.
Added 5 mins ago
LH
Maintenance Engineer - Homewood Suites, Dover, NH
Lafrance Hospitality
Dover, NH · Portsmouth, NH · Rochester, NH
- $23 to $26 USD / hour
Homewood Suites Hotel located in Dover, NH at 21 Members Way is looking for a Full-Time Hotel Maintenance Engineer (with comprehensive benefits).
Added 6 mins ago
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Embedded Software Engineer
Actalent
North Reading, MA
- $75 to $85 USD / hour
…directly interface with sensors, motor controllers, actuators, and hardware platforms used in safety-critical robotics applications. You will support the development and evolution of the…
Added 6 mins ago
A
Manufacturing Test Engineer
Actalent
Wilmington, MA
- $89.82 to $90.9 USD / hour
Job Title: Manufacturing Test EngineerJob DescriptionThe Experienced Manufacturing Test Engineer will develop and manage the manufacturing test strategy for complex electromechanical…
Added 6 mins ago
A
Systems Engineer - Space And EO/IR Sensor Systems
Actalent
Acton, MA
- $150,000 to $200,000 USD / year
We are seeking an experienced Systems Engineer to support the development, integration, testing, and deployment of advanced space-based Electro-Optical/Infrared (EO/IR) sensor and payload…
Added 6 mins ago
Mechanical Engineer
Actalent
Nashua, NH
Principal Mechanical EngineerJob DescriptionWe are seeking a highly motivated Principal Mechanical Engineer to provide technical leadership in the design, development, analysis, and…
Added 6 mins ago
A
Electrical Engineer
Actalent
Sunnyvale, CA
- $105 USD / hour
Job Title: Electrical EngineerJob DescriptionThe primary role of an Electrical Engineer is to design, develop, test, and oversee the manufacturing and installation of electrical equipment,…
Added 6 mins ago
A
Electronics Test Engineer
Actalent
Merritt Island, FL
- $36 to $43 USD / hour
Job Title: Integration and Test EngineerJob DescriptionThe Integration and Test Engineer defines, documents, analyzes, performs, and interprets tests for products, systems, components, and…
Added 6 mins ago
Structural Engineer
Actalent
Redondo Beach, CA
…work on cutting-edge optical payloads and high-performance hardware for next-generation space…
Added 6 mins ago
Structural Engineer
Actalent
Pasadena, CA
…work on cutting-edge optical payloads and high-performance hardware for next-generation space…
Added 6 mins ago
Structural Engineer - NASTRAN
Actalent
Huntsville, AL
We are seeking an experienced Opto-Mechanical Structural Engineer/Analyst to support the design, development, analysis, and production of advanced spaceborne electro-optical sensor…
Added 7 mins ago
Mission Operations Engineer (Entry-Level) - Millennium Space Systems
Millennium Space Systems
Chantilly, VA
As a Mission Operations Engineer, you will be the lead technical authority for Millennium’s on-orbit spacecraft. Your work will encompass the entire spacecraft mission life cycle, from the…
Added 7 mins ago
Flight Engineering Manager (Guidance Navigation & Control))
The Boeing Company
Hazelwood, MO · St. Louis City, MO
Experience Experience with Operational Flight Program (OFP) development, certification, and testing Experience with Hardware in the loop (HILS) testing

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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