Full-Time

Prompt Engineer

Agent Prompts & Evals

Anthropic

Anthropic

5,001-10,000 employees

Develops reliable, interpretable AI systems

Compensation Overview

$320k - $405k/yr

H1B Sponsorship Available

San Francisco, CA, USA + 1 more

More locations: New York, NY, USA

Hybrid

Must be in-office at least 25% of the time; hybrid role.

Category
Software Engineering (1)
Required Skills
LLM
Python
DevOps
Requirements
  • 5+ years of software engineering experience with Python or similar languages.
  • Demonstrated experience with LLMs and prompt engineering (through work, research, or significant personal projects).
  • Strong understanding of evaluation methodologies and metrics for AI systems.
  • Excellent written and verbal communication skills – you’ll need to explain complex model behaviors to diverse stakeholders.
  • Ability to manage multiple concurrent projects and prioritize effectively.
  • Experience with version control, CI/CD, and modern software development practices.
  • Bachelor’s degree or an equivalent combination of education, training, and/or experience.
  • Minimum field of study: A field relevant to the role as demonstrated through coursework, training, or professional experience.
Responsibilities
  • Design, test, and optimize system prompts and feature-specific prompts that shape Claude’s behavior across consumer and API products.
  • Build and maintain comprehensive evaluation suites that ensure model quality and consistency across product launches and updates.
  • Partner closely with product teams, research teams, and safeguards to ensure new features meet quality and safety standards.
  • Play a critical role in model releases, ensuring smooth rollouts and catching regressions before they impact users.
  • Help build and improve the frameworks and tools that allow teams to develop and test prompts and features with confidence.
  • Mentor product engineers on prompt engineering best practices and help teams build their first evaluations.
  • Work in a fast-paced environment where model capabilities advance daily, requiring quick adaptation and creative problem-solving.
Desired Qualifications
  • Experience with Claude or other frontier AI models in production settings.
  • Background in machine learning, NLP, or related fields.
  • Experience with A/B testing and experimentation frameworks (e.g., Statsig).
  • Familiarity with AI safety and alignment considerations.
  • Experience building tools and infrastructure for ML/AI workflows.
  • Track record of improving AI system performance through systematic evaluation and iteration.

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

Late Stage VC

Total Funding

$77.3B

Headquarters

San Francisco, California

Founded

2021

Simplify Jobs

Simplify's Take

What believers are saying

  • Claude for Small Business targets 36M US firms via QuickBooks and Canva integrations.
  • Japan's three megabanks access Claude Mythos by May 2026 end, expanding finance revenue.
  • Thomson Reuters MCP links Claude to 1.9B Westlaw documents for legal dominance.

What critics are saying

  • Japan FSA's 36-entity group imposes Mythos cybersecurity audits within 6 months.
  • Legal hallucinations trigger malpractice suits against Freshfields using Claude live.
  • Thomson Reuters captures enterprise legal revenue, sidelining Anthropic plugins.

What makes Anthropic unique

  • Anthropic prioritizes AI safety through interpretable and steerable Claude models.
  • Claude integrates Model Context Protocol for grounded legal and business workflows.
  • Constitutional AI framework ensures Claude aligns with human values and transparency.

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Your Connections

People at Anthropic who can refer or advise you

Benefits

Flexible Work Hours

Paid Vacation

Parental Leave

Hybrid Work Options

Company Equity

Growth & Insights and Company News

Headcount

6 month growth

-3%

1 year growth

-3%

2 year growth

1%
Ars Technica
Apr 21st, 2026
Mozilla: Anthropic's Mythos AI model finds 271 zero-day bugs in Firefox 150

Mozilla has discovered 271 security vulnerabilities in Firefox 150 using early access to Anthropic's Mythos Preview AI model. The findings represent a significant increase from the 22 bugs detected by Anthropic's Opus 4.6 model in Firefox 148 last month. Firefox CTO Bobby Holley said Mythos is "every bit as capable" as the world's best security researchers, whilst eliminating the need to "concentrate many months of costly human effort to find a single bug". He believes AI tools like Mythos tilt the cybersecurity balance towards defenders by making vulnerability discovery cheaper. Anthropic released Mythos Preview to a limited group of industry partners earlier this month. Mozilla CTO Raffi Krikorian argues such tools are particularly crucial for open source projects, which often rely on insufficient volunteer maintenance for security.

Bloomberg L.P.
Apr 21st, 2026
Anthropic's Mythos AI sparks fear and hope over cybersecurity threats to global finance

Anthropic's new AI model Mythos has sparked concern amongst policymakers at International Monetary Fund meetings over its potential to accelerate sophisticated cyberattacks on the global financial system. However, its developers argue the technology could provide banks with their strongest defence yet. What distinguishes Mythos is its ability to chain multiple security weaknesses into coordinated attacks, effectively automating complex cyber intrusions. This capability could significantly expand the pool of potential attackers in the near term. The model's creators emphasise a longer-term benefit: the same technology could enable banks to detect and patch vulnerabilities faster than ever, potentially shifting the balance towards defenders if widely adopted. The dual-use nature of Mythos has created both panic and optimism in boardrooms and governments regarding global financial system security.

Bloomberg L.P.
Apr 17th, 2026
Indian fintechs push Anthropic for early access to 'dangerous' Mythos AI model

Indian fintech companies including One97 Communications, Razorpay Software and Pine Labs are pushing Anthropic for early access to Mythos, the AI model that has raised global concerns about cyberattack risks. The firms want to test Mythos on their own systems to detect vulnerabilities following Anthropic's announcement of a limited rollout. The San Francisco-based AI developer considers the model too dangerous for wider release but major Indian financial technology companies are seeking early access to assess potential security threats to their platforms.

Bloomberg L.P.
Apr 16th, 2026
US government prepares to give federal agencies access to Anthropic's Mythos AI model

The US government is preparing to provide major federal agencies with access to Anthropic's new AI model, Mythos, according to a memo reviewed by Bloomberg News. Gregory Barbaccia, federal chief information officer at the White House Office of Management and Budget, informed Cabinet department officials on Tuesday that OMB is establishing protections to enable agencies to use the closely guarded AI tool. The move comes amid concerns that the powerful model could significantly increase cybersecurity risks. OMB is working to set up appropriate safeguards before rolling out access to the system across government departments.

Bloomberg L.P.
Apr 16th, 2026
Anthropic's Mythos AI model raises cybersecurity alarms for banks and governments

Anthropic's new Mythos AI model is causing concern among banks, tech giants and governments over its potential implications for cybersecurity and the internet's future. The model has prompted a scramble amongst major institutions to understand its capabilities and risks. Details about the specific features raising alarms were not disclosed in the source material.