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105 startups and scale-ups in London are hiring AI and machine learning engineers right now, with 235 live roles between them, 93 of them opened in the last 30 days. Pick the ones you want and Haystack's AI agent fills in each employer's application for you.

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84% of candidates get an interview within 14 days568,056 candidatesRated 4.8/5 on G2
London · AI and ML engineersLive roles today
  • MIMistral.ai logo
    Mistral.aiStartup · 51-200 staff17 roles
  • ANAnthropic logo
    AnthropicScale-up · 201-500 staff17 roles
  • WAWayve logo
    WayveScale-up · 201-500 staff11 roles
  • SPSpaitial logo
    SpaitialStartup · Under 50 staff10 roles
  • ILIsomorphic Labs logo
    Isomorphic LabsStartup · 201-500 staff8 roles
  • CE
    CoreWeave EuropeScale-up · Hybrid6 roles

and 99 more companies on the list

105 companies hiring now

Ranked by live roles (AI engineers, machine learning engineers and research scientists). Every company is a startup or scale-up; recruitment agencies are left out. Press Auto apply on any role and Haystack's AI agent fills in that employer's form for you.

The top 40 of 105 companies, most live roles first.

  1. MIMistral.ai logo

    Mistral.ai

    Startup51-200 staffTechnology & SoftwareOffice-first

    17roles7 opened this month

    Mistral AI is an artificial intelligence company that develops large language models and aims to make AI open, efficient, and useful for everyone.

    All 17 roles at Mistral.ai

  2. ANAnthropic logo

    Anthropic

    Scale-up201-500 staffTechnology & Software

    17roles4 opened this month

    Anthropic is an AI research company dedicated to developing safe, reliable, and steerable AI systems for humanity's long-term well-being.

    Replied to 50% of the applications Haystack's agent sentAll 17 roles at Anthropic

  3. WAWayve logo

    Wayve

    Scale-up201-500 staffAutomotive

    11roles11 opened this month

    Wayve develops AI for autonomous driving, aiming to create adaptable self-driving vehicles that enhance mobility for everyone.

    All 11 roles at Wayve

  4. SPSpaitial logo

    Spaitial

    StartupUnder 50 staffOther

    10roles3 opened this month

    SpAItial pioneers physically-grounded World Models, an AI paradigm to generate and reason about real and imagined 3D environments.

    All 10 roles at Spaitial

  5. ILIsomorphic Labs logo

    Isomorphic Labs

    Startup201-500 staffPharmaceuticals & Biotech

    8roles4 opened this month

    Isomorphic Labs uses artificial intelligence to accelerate drug discovery and design new medicines, aiming to advance human health and solve all disease.

    All 8 roles at Isomorphic Labs

  6. CE

    CoreWeave Europe

    Scale-upHybrid

    6roles6 opened this month

    To deliver cloud infrastructure and tools that enable innovators to build and scale artificial intelligence workloads.

    All 6 roles at CoreWeave Europe

  7. PEPerplexity logo

    Perplexity

    Startup51-200 staffTechnology & Software

    6roles1 opened this month

    Perplexity aims to revolutionise how people access and understand information online using an AI-powered conversational search engine.

    All 6 roles at Perplexity

  8. FIFin logo

    Fin

    Scale-up1,001-5,000 staffOffice-first

    5roles

    Fin aims to deliver perfect customer experiences by providing an AI-powered customer agent across the entire customer journey.

    Replied to 100% of the applications Haystack's agent sentAll 5 roles at Fin

  9. IAIndicium AI logo

    Indicium AI

    Scale-upHybrid

    4roles4 opened this month

    To make artificial intelligence a genuine competitive advantage for enterprises by delivering production AI systems at scale.

    All 4 roles at Indicium AI

  10. PRPreply logo

    Preply

    Scale-up501-1,000 staffEducationHybrid

    4roles

    Preply is an online language learning platform connecting students with tutors to enable personalised live language classes with AI-powered tools.

    Replied to 100% of the applications Haystack's agent sentAll 4 roles at Preply

  11. RERelationrx logo

    Relationrx

    Scale-upOffice-first

    4roles

    Relation is building a pharmaceutical company with AI at its core, using proprietary AI and experimental platforms to drive mechanistic understanding of disease across the drug development cycle.

    All 4 roles at Relationrx

  12. WHWhitecircle logo

    Whitecircle

    StartupRemote-first

    4roles

    White Circle is an AI Safety company building the safety, reliability, and optimisation layer for AI systems.

    All 4 roles at Whitecircle

  13. COCorndel logo

    Corndel

    Scale-up201-500 staffEducationRemote-first

    3roles3 opened this month

    Corndel inspires individuals and organisations to develop skills in leadership, management, and technology to enhance workplace capabilities and shape the future.

  14. HIHirehire logo

    Hirehire

    Scale-upOffice-first

    3roles3 opened this month

    Humanoid builds capable, commercially scalable and safe humanoid robots.

  15. SA

    Sash

    Scale-upHybrid

    3roles3 opened this month

    SASH is an international research organisation focused on enabling global technical collaboration on AI safety, particularly between the East and West.

  16. NSNiantic Spatial logo

    Niantic Spatial

    StartupHybrid

    3roles2 opened this month

    Niantic Spatial builds a living model of the world that people and machines can interact with, using real-world foundation models for physical AI.

  17. OMOmnea logo

    Omnea

    Scale-upRemote-first

    3roles2 opened this month

    Omnea reinvents how enterprise businesses operate by providing an AI-native platform to streamline procurement processes.

  18. 9F9fin logo

    9fin

    Scale-up501-1,000 staffRemote-first

    3roles1 opened this month

    9fin provides data and analytics solutions for debt capital markets, empowering finance professionals to make informed decisions.

  19. KIKi logo

    Ki

    Scale-upHybrid

    3roles1 opened this month

    Ki aims to digitally disrupt and revolutionise the 335-year-old insurance market by using algorithms, machine learning, and large language models.

  20. PHPhasecraft logo

    Phasecraft

    StartupUnder 50 staffTechnology & Software

    3roles1 opened this month

    Phasecraft develops quantum algorithms to overcome quantum software limitations, applying research to real-world problems for practical quantum advantage.

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Reddit
Interview: Customer Success Manager
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Thu, Oct 30 · 2:00–2:45 PM · Google Meet
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Figma
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Notion
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Which startups are hiring AI and machine learning engineers in London?

As of October 2026, 105 startups and scale-ups in London are hiring AI and machine learning engineers, with 235 live roles between them. The most are at Mistral.ai, Anthropic, Wayve, Spaitial, Isomorphic Labs. The full list on this page is rebuilt every day from the employers' own careers sites.

Which small companies (under 50 staff) are hiring AI and machine learning engineers in London?

Of the companies on this list, Spaitial, Phasecraft, Basecamp Research have fewer than 50 staff on record. Use the "Under 50 staff" filter above the list to see only them. Team sizes come from company records and are not known for every company, so other small teams may be on the list too.

How is this list made?

Haystack reads the careers sites of more than 30,000 employers every day. This list takes the live roles in London for AI engineers, machine learning engineers and research scientists at companies recorded as startups or scale-ups, leaves out recruitment agencies, and ranks the companies by how many of those roles they have open.

Can I apply to all of these at once?

Not in one click, and you wouldn't want to. With Haystack Auto Apply you upload your resume once and pick the roles you want; Haystack's AI agent then fills in and submits each employer's own application form, asks you when a question needs your answer, and every reply lands in your Haystack inbox. Nothing is sent without your say-so.

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