jobctl

Network Engineer, High-Speed Interconnects (ML Infrastructure)

SpaceXSI - Palo Alto, CA - original posting ->
Status
Open
Remote policy
Not stated
Employment type
Not stated
Salary
Not stated
Categories
Infrastructure
Tech
ml
Source
xai
First observed
2026-08-18 21:02 UTC
Last seen
2026-10-28 10:01 UTC
Source claims posted
2026-02-05 03:21 UTC
Consecutive misses
0 of 3

What the posting says

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.

NETWORK ENGINEER, HIGH-SPEED INTERCONNECTS (ML INFRASTRUCTURE)

SpaceXSI is building at a furious pace with the latest compute and switching hardware to help people understand the universe. We are looking for exceptional ML Infrastructure Engineers with deep expertise in high-speed interconnect technologies to design, build, and optimize the network fabric that powers large-scale AI training and inference clusters. This strategic role will drive innovation in high-bandwidth, low-latency, power-efficient interconnects critical for AI/ML clusters based on advanced computing platforms.

You will have the opportunity to work on all modalities of interconnects connecting GPUs and switches both inside and between data centers, including our primary front and backend networks that train Grok and that customers use for inference. Engineers will own all aspects from design and development to build and operations. You will be expected to define and improve team processes and to contribute to scaling and maintenance efforts.

You will focus on the physical layer and system-level integration of copper (ACC, AEC, CPC) and optical (FRO, LRO/TRO, LPO, AOC, CPO) interconnects that directly determine the performance, power efficiency, scale, and cost of next-generation AI/ML clusters. This is a highly technical, hands-on role bridging ML cluster requirements with cutting-edge interconnect hardware — ideal for engineers who love both large-scale AI systems and the physics/engineering of 200G+ SerDes, PAM4, photonics, signal integrity and diagnostics.

RESPONSIBILITIES:

Design, validate, and productize high-speed copper and optical connectivity solutions for AI clusters (100k+ GPU scale)

Own vendor due diligence and onboarding for new 1.6T products including AEC and pluggable optical transceivers (DR4/8, FR4) including rigorous bring-up & characterization

Investigate the opportunity for LPO and LRO in our network

Evaluate early co-packaged and near-packaged engines for switches and GPUs

Evaluate and pathfind new interconnect modalities including VCSEL, microLED, THz radio-based solutions to improve network economics and reliability

Work closely with vendors (transceiver, cable, SerDes, DSP, silicon photonics foundries) to influence roadmaps and ensure timely delivery of next-gen solutions

Collaborate with ML training teams to translate workload communication patterns into concrete interconnect topology and optical reconfigurability requirements

Perform system-level simulation of end-to-end fabric performance

Drive failure analysis, root cause, and corrective actions for interconnect-related issues in production clusters through fleet-level metrics gathering and analysis

Contribute to internal tooling and automation for interconnect health monitoring, telemetry, diagnostics, remediation and automated qualification pipelines

Stay current with industry standards (OIF CMIS, IEEE) and emerging technologies (multi-core/hollow-core fiber, 448G SerDes, TFLN, ring resonators)

BASIC QUALIFICATIONS:

8+ years of experience in designing, deploying and operating high-speed copper, and optical interconnects

Master’s degree or Ph.D. in electrical engineering, photonics, or physics

PREFERRED SKILLS AND EXPERIENCE:

Experience in a module design role or in a hyperscale datacenter environment

Deep knowledge of PAM4 SerDes performance, equalization, jitter, crosstalk

Solid operational understanding of FEC, Retimers, TIAs and Drivers

Deep knowledge of optical link budget analysis and performance metrics including TDECQ, OMA, Tcode, stressed receiver sensitivity and associated diagnostics

Expertise in transceiver components including CW lasers, SiPh PICs, EML, DSP, passive subassemblies, their failure modes and characterization

Knowledge of thermal, mechanical, power, signal integrity constraints in dense hardware

Knowledge of SiPh design process, yield improvement and reliability testing

Familiarity with CPO technologies and challenges/risk areas

Familiarity with subcomponent supply chains and global manufacturers, ODMs and CMs

Strong problem-solving skills and ability to thrive in a fast-paced, ambiguous setting

COMPENSATION AND BENEFITS:

$180,000 - $440,000 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.

Quality

Completeness: 45%
Honesty: 90%

Based on 21 observation(s).

Timeline

  1. *
    #161965 2026-08-18 21:02 UTC
    Published
  2. ~
    #167692 2026-08-19 01:02 UTC
    Modified
    • source_updated_at
      2026-08-18T15:14:36-04:00->2026-08-18T18:10:46-04:00
  3. ~
    #199917 2026-08-20 01:16 UTC
    Modified
    • source_updated_at
      2026-08-18T18:10:46-04:00->2026-08-19T18:53:03-04:00
  4. ~
    #231363 2026-08-21 04:27 UTC
    Modified
    • source_updated_at
      2026-08-19T18:53:03-04:00->2026-08-20T20:36:54-04:00
  5. ~
    #259324 2026-08-21 23:53 UTC
    Modified
    • source_updated_at
      2026-08-20T20:36:54-04:00->2026-08-21T18:24:01-04:00
  6. ~
    #388627 2026-08-26 22:37 UTC
    Modified
    • source_updated_at
      2026-08-21T18:24:01-04:00->2026-08-26T17:48:54-04:00
  7. ~
    #394255 2026-08-27 06:39 UTC
    Modified
    • source_updated_at
      2026-08-26T17:48:54-04:00->2026-08-26T23:12:24-04:00
  8. ~
    #407501 2026-08-27 22:40 UTC
    Modified
    • source_updated_at
      2026-08-26T23:12:24-04:00->2026-08-27T18:09:48-04:00
  9. ~
    #557835 2026-09-03 21:32 UTC
    Modified
    • Locations
      Palo Alto, California->Palo Alto, CA
    • source_updated_at
      2026-08-27T18:09:48-04:00->2026-09-03T14:58:20-04:00
  10. ~
    #564589 2026-09-04 05:32 UTC
    Modified
    • source_updated_at
      2026-09-03T14:58:20-04:00->2026-09-04T00:53:32-04:00
  11. ~
    #646402 2026-09-08 23:51 UTC
    Modified
    • source_updated_at
      2026-09-04T00:53:32-04:00->2026-09-08T18:33:02-04:00
  12. ~
    #963321 2026-09-24 06:03 UTC
    Modified
    • source_updated_at
      2026-09-08T18:33:02-04:00->2026-09-23T23:22:06-04:00
  13. ~
    #975065 2026-09-24 18:07 UTC
    Modified
    • source_updated_at
      2026-09-23T23:22:06-04:00->2026-09-24T13:08:38-04:00
  14. ~
    #1100354 2026-09-30 22:44 UTC
    Modified
    • source_updated_at
      2026-09-24T13:08:38-04:00->2026-09-30T16:41:12-04:00
  15. ~
    #1295408 2026-10-12 13:22 UTC
    Modified
    • Description
      SpaceXAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our...->SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where...
  16. ~
    #1311482 2026-10-13 01:08 UTC
    Modified
    • Description
      SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where...->SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where...
    • source_updated_at
      2026-09-30T16:41:12-04:00->2026-10-12T19:35:19-04:00
  17. ~
    #1314456 2026-10-13 05:08 UTC
    Modified
    • Organisation
      SpaceXAI->SpaceXSI
  18. ~
    #1330540 2026-10-13 21:10 UTC
    Modified
    • Description
      SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where...->SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where...
    • source_updated_at
      2026-10-12T19:35:19-04:00->2026-10-13T15:30:02-04:00
  19. ~
    #1334752 2026-10-14 01:11 UTC
    Modified
    • source_updated_at
      2026-10-13T15:30:02-04:00->2026-10-13T20:15:02-04:00
  20. ~
    #1488252 2026-10-22 18:01 UTC
    Modified
    • source_updated_at
      2026-10-13T20:15:02-04:00->2026-10-22T11:10:16-04:00
  21. ~
    #1588271 2026-10-28 10:01 UTC
    Modified
    • Title
      Network Engineer - ML Infrastructure (High-Speed Interconnects)->Network Engineer, High-Speed Interconnects (ML Infrastructure)
    • Description
      SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where...->SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where...
    • source_updated_at
      2026-10-22T11:10:16-04:00->2026-10-28T02:12:40-04:00