A

Anthropic

Develops reliable, interpretable AI systems

Staff Software Engineer - AI Reliability Engineering

Full-TimeUpdated on 10/1/2026
£325k - £390k/yr
Senior
Bachelor's
London, UK
HybridAt least 25% of working time in an office is required.

About the job

Requirements
  • Strong background in distributed systems, infrastructure, or reliability engineering.
  • Experience operating large-scale systems, product stacks, databases, or massive distributed systems.
  • Ability to work across unfamiliar systems during incidents and help drive resolution.
  • Ability to think holistically about system composition and interfaces between systems.
  • Ability to build effective relationships and collaborate across teams.
  • Ownership of user and system outcomes, including systems outside the engineer's direct ownership.
Responsibilities
  • Develop Service Level Objectives for large language model serving systems, balancing availability and latency with development velocity.
  • Design and implement monitoring and observability systems across the token path.
  • Assist in designing and implementing high-availability serving infrastructure across multiple regions and cloud providers.
  • Lead incident response for critical AI services, ensuring rapid recovery, thorough incident reviews, and systematic improvements.
  • Support the reliability of safeguard model serving for site reliability and safety commitments.
Desired Qualifications
  • Experience as a site reliability engineer, production engineer, or in a similar reliability-focused role on large-scale systems.
  • Experience operating large-scale model serving or training infrastructure involving more than 1,000 GPUs.
  • Experience with machine learning hardware accelerators such as GPUs, TPUs, or Trainium.
  • Understanding of machine-learning-specific networking optimizations such as RDMA and InfiniBand.
  • Expertise in AI-specific observability tools and frameworks.
  • Experience with chaos engineering and systematic resilience testing.
  • Contributions to open-source infrastructure or machine learning tooling.

About the company

Anthropic focuses on AI research to build reliable, interpretable, and steerable AI systems. Its main product, Claude, is an AI assistant designed to handle tasks at any scale for clients across industries, delivered through deployment and licensing along with specialized AI R&D services. Claude works by combining natural language processing, human feedback, reinforcement learning, and interpretability techniques to produce a capable, controllable AI assistant that can assist with a wide range of tasks. The company differentiates itself from competitors by prioritizing safety, transparency, and controllability—emphasizing reliability, interpretability of model behavior, and user-controlled steerability in its AI systems. Anthropic’s goal is to make AI systems that people can trust and efficiently use to improve operations and decision-making across sectors.

Company Size

5,001-10,000

Company Stage

Debt Financing

Total Funding

$182.8B

Headquarters

San Francisco, California

Founded

2021

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Simplify's Take

What believers are saying

  • Reuters on September 28, 2026 said revenue jumped 12-fold to nearly $4.6 billion.
  • Akamai signed an $11.6 billion, seven-year Anthropic deal on September 24, 2026.
  • Sonnet 5.5 launched September 28, 2026, running 30% faster and cheaper than Sonnet 5.

What critics are saying

  • Reuters on September 29, 2026 said Amazon and Google channel 47% of 2025 sales.
  • Anthropic disclosed $518 billion in commitments; $417 billion exceeded by early 2026, crushing flexibility.
  • OpenAI and Meta keep shipping faster models; Anthropic’s safety warnings invite stricter regulation and litigation.

What makes Anthropic unique

  • Anthropic’s safety-first brand still defines Claude, especially Sonnet 5.5’s cyber safeguards.
  • Enterprise customers drive about 80% of business, including Salesforce, Databricks, Goldman Sachs, Novo Nordisk.
  • Claude runs across AWS, Google Cloud, and Microsoft Azure, widening enterprise distribution.

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Benefits

Flexible Work Hours

Paid Vacation

Parental Leave

Hybrid Work Options

Company Equity

Growth & Insights and Company News

Headcount

6 month growth

↑ 0%

1 year growth

↑ 3%

2 year growth

↑ 2%
Yahoo Finance
Sep 30th, 2026
Akamai lands $11.6B AI deal with Anthropic, shares jump 20%

Akamai Technologies announced an $11.6 billion, seven-year agreement with AI company Anthropic, which will use Akamai Cloud's infrastructure to support its CPU workloads. The deal includes provisions to expand by another $9 billion, potentially reaching $20 billion. Akamai also issued warrants to Anthropic that could represent roughly 5% of its outstanding shares. The Massachusetts-based cloud computing and cybersecurity firm had already secured $2.8 billion in multi-year cloud infrastructure commitments this year. Shares jumped over 20% following the announcement and are up 45% over the past year. The agreement will require $5.5 billion in new capital expenditures, with $1.7 billion realised in the fourth quarter. Analysts see significant upside, with a mean price target representing 44% potential gains from current levels.

Yahoo Finance
Sep 30th, 2026
Bill Ackman praises Anthropic but won't invest due to $42B losses and uncertain AI model advantage

Billionaire investor Bill Ackman praised AI startup Anthropic as "perhaps the greatest business story I've ever seen" but said his hedge fund Pershing Square likely won't invest in the company. Speaking to Bloomberg TV on Wednesday, Ackman lauded Anthropic's revenue growth and Claude product. However, he explained his fund prefers predictable, capital-efficient businesses like Microsoft, Visa, and Mastercard rather than fast-growing companies consuming substantial capital. He also questioned whether frontier AI models can maintain their advantage against lower-cost alternatives. Anthropic reportedly achieved nearly $4.6 billion in 2025 revenue, up 12-fold, but net losses reached $42 billion. The company is targeting a $2 trillion valuation in its planned IPO later this year. Pershing Square currently holds shares in Meta, Amazon, and Microsoft.

The Register
Sep 30th, 2026
OpenAI launches marketplace letting customers use spend credits with 32 partners including open models

OpenAI has launched a marketplace allowing customers to retire spend commitments through 32 partners, mirroring AWS Marketplace's model. The move signals OpenAI's strategy to win through merit rather than coercion. By including Baseten, which provides access to open models, OpenAI demonstrates willingness to embrace competing models. This contrasts with Anthropic's approach, which blocks Claude Pro users from integrating with certain tools. The marketplace features caveats: only a fixed percentage of spend applies up to a cap, eligibility varies by customer and product, and billing occurs directly through partners. There's no self-service option at launch. The development positions OpenAI to benefit from customer decisions beyond model selection, potentially making its contract central to software purchasing decisions. This shift suggests AI labs are becoming the new cloud providers, whilst traditional cloud providers risk becoming less relevant to technology adoption decisions.

Yahoo Finance
Sep 30th, 2026
Michael Burry calls for market crash to prevent OpenAI and Anthropic IPOs, citing trillions at risk

Michael Burry has called for a market crash severe enough to prevent OpenAI and Anthropic from going public. The Big Short investor said markets should "tank hard" for humanity's benefit, arguing the AI companies would "absorb and then destroy trillions of dollars in capital". Anthropic's prospectus reveals a $42 billion net loss in 2025 and $518 billion in planned cloud obligations, though the operating loss was closer to $8.06 billion. The company could seek a valuation above $2 trillion. OpenAI has pushed its listing to 2027. Burry endorsed a follower's joke about preventing "Skynet" from going public, referencing the Terminator franchise's rogue AI. He previously called the labs' slowdown pleas self-serving and recently swapped shorts for puts on AI-linked stocks.

Yahoo Finance
Sep 29th, 2026
Tech analyst Dan Ives calls Anthropic's IPO risk warnings 'alarmism' as firm posts $4.6B revenue, $42B loss

Anthropic's leaked IPO prospectus revealed 2025 sales surged 1,088% to $4.59 billion, according to Reuters. However, the AI company posted a GAAP net loss of $41.97 billion last year, up from $8.31 billion in 2024. The prospectus formally warned investors that its technology may pose "existential risks to humanity." Wedbush analyst Dan Ives called the risk disclosures a "shocker" and suggested some "alarmism" in the company's warnings. Despite the losses and warnings, Ives described Anthropic as "the heart and lungs of the AI revolution," comparing the industry's current phase to "building out a new economy over the next 10 years." No official filing has been made public yet.