jobctl

Sr. Backend Engineer, API

SpaceXSI - London, England, United Kingdom - original posting ->
Status
Open
Remote policy
Not stated
Employment type
Not stated
Salary
Not stated
Categories
Engineering
Tech
clickhousemongodbpostgresdockerkubernetescppgorustbackendsenior
Source
xai
First observed
2026-08-18 21:02 UTC
Last seen
2026-11-06 10:49 UTC
Source claims posted
2026-04-24 18:40 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.

SR. BACKEND ENGINEER, API

We are looking for Backend Engineers to help build and operate highly scalable, reliable production infrastructure. Most of our backend infrastructure is written in Rust. Experience with a compiled language such as Rust, C++, or Go is highly beneficial.

RESPONSIBILITIES:

Build and maintain the unified inference stack as the single surface area for all inference needs across the company

Own and evolve the platform services that power Chat API, Imagine API, Voice API, Grok Build, and Grok Bot

Design, build, and maintain Chat API features including batch API, collections API, files API, and related capabilities

Implement and operate chat moderation and abuse protection systems across the API and grok.com

Build and maintain the company-wide logging system for all request types, including enforcement of Zero Data Retention (ZDR) policies

Manage multi-region inference cluster (IC) deployments, data aggregation, data replication, and the distributed authentication system

Participate in follow-the-sun on-call coverage (UK → Japan → US) to ensure continuous reliability of the inference platform

BASIC QUALIFICATIONS:

5+ years of experience in designing, implementing, and maintaining reliable and horizontally scalable distributed systems

Experience with Rust or C++

PREFERRED SKILLS AND EXPERIENCE:

Experience in operating databases such as PostgreSQL, Clickhouse, and MongoDB

Knowledge of service observability and reliability best practices

Experience with LLM inference engines and serving frameworks (e.g., SGLang, TensorRT, vLLM)

Experience designing or building with agent SDKs and agent orchestration frameworks

Experience with Docker, Kubernetes, and containerized applications

Expert knowledge of gRPC (unary, response streaming, bi-directional streaming, REST mapping)

COMPENSATION AND BENEFITS:

£107,000 - £262,000 GBP

Base salary is just one part of our total rewards package at SpaceXSI, which also includes equity, comprehensive healthcare and dental coverage, cash plan, income protection, 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 27 observation(s).

Timeline

  1. *
    #161913 2026-08-18 21:02 UTC
    Published
  2. ~
    #167639 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. ~
    #199863 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. ~
    #231308 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. ~
    #259270 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. ~
    #388581 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. ~
    #394209 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. ~
    #407454 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. ~
    #557786 2026-09-03 21:32 UTC
    Modified
    • source_updated_at
      2026-08-27T18:09:48-04:00->2026-09-03T14:58:20-04:00
  10. ~
    #564540 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. ~
    #646353 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. ~
    #963267 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. ~
    #975012 2026-09-24 18:07 UTC
    Modified
    • source_updated_at
      2026-09-23T23:22:06-04:00->2026-09-24T13:08:50-04:00
  14. ~
    #1100294 2026-09-30 22:44 UTC
    Modified
    • source_updated_at
      2026-09-24T13:08:50-04:00->2026-09-30T16:41:12-04:00
  15. ~
    #1295348 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. ~
    #1311421 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. ~
    #1314395 2026-10-13 05:08 UTC
    Modified
    • Organisation
      SpaceXAI->SpaceXSI
  18. ~
    #1330480 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->2026-10-13T15:30:12-04:00
  19. ~
    #1334692 2026-10-14 01:11 UTC
    Modified
    • source_updated_at
      2026-10-13T15:30:12-04:00->2026-10-13T20:15:02-04:00
  20. ~
    #1488191 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. ~
    #1603289 2026-10-29 06:02 UTC
    Modified
    • Title
      Backend Engineer - API->Backend Engineer, API
    • 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->2026-10-29T00:53:04-04:00
  22. ~
    #1721011 2026-11-04 02:47 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
      2026-10-29T00:53:04-04:00->2026-11-03T20:04:31-05:00
  23. ~
    #1732303 2026-11-04 18:48 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
      2026-11-03T20:04:31-05:00->2026-11-04T13:39:28-05:00
  24. ~
    #1737713 2026-11-04 22:48 UTC
    Modified
    • source_updated_at
      2026-11-04T13:39:28-05:00->2026-11-04T14:33:15-05:00
  25. ~
    #1756528 2026-11-05 14:48 UTC
    Modified
    • source_updated_at
      2026-11-04T14:33:15-05:00->2026-11-05T09:40:53-05:00
  26. ~
    #1761121 2026-11-05 18:48 UTC
    Modified
    • source_updated_at
      2026-11-05T09:40:53-05:00->2026-11-05T13:33:11-05:00
  27. ~
    #1775036 2026-11-06 10:49 UTC
    Modified
    • Title
      Backend Engineer, API->Sr. Backend Engineer, API
    • 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
      2026-11-05T13:33:11-05:00->2026-11-06T01:57:31-05:00