Anthropic's sandboxing infrastructure enables Claude to safely execute code and interact with external systems. As we expand Claude's capabilities, the reliability, security, and developer experience of this infrastructure becomes increasingly critical. We're looking for an engineer to join the sandboxing team and help shape both the client-side library/API and the underlying infrastructure.

In this role, you'll combine deep infrastructure expertise with an obsession for developer experience. You'll help maintain and evolve a system that must be correct, performant, and intuitive to use. You'll work closely with internal teams to understand their needs, burn down errors and edge cases, and build a roadmap that anticipates where the product needs to go. This is a role for someone who finds satisfaction in both the craft of building reliable systems and the empathy required to serve developers and researchers well.

Responsibilities

• Contribute to the client library, API surface, and underlying infrastructure for Anthropic's sandboxing system, ensuring it is reliable, well-documented, and intuitive to use
• Drive down error rates and improve correctness through systematic debugging, monitoring, and proactive fixes
• Help develop and maintain a product roadmap for sandboxing capabilities, balancing immediate needs with long-term architectural improvements
• Partner closely with internal teams using the sandboxing system to understand their requirements, debug issues, and build tooling that serves their use cases
• Respond to incidents and production issues with urgency, conducting thorough root cause analysis and implementing preventive measures
• Build comprehensive testing, observability, and documentation to ensure the system meets a high quality bar
• Collaborate across the sandboxing team, flexing between client-side and infrastructure work as needed

You May Be a Good Fit If You

• Have 5+ years of software engineering experience, with meaningful time spent maintaining libraries, SDKs, or developer-facing APIs
• Obsess over developer experience,you've thought deeply about API design, error propagation, documentation, and the small details that make a library feel well-crafted
• Have experience operating complex distributed systems
• Bring a track record of systematically improving reliability,you've burned down error budgets, built monitoring, and driven issues to resolution
• Can develop and articulate a long-term vision for a product, translating user feedback and technical constraints into a coherent roadmap
• Are comfortable with ambiguity and can context-switch between reactive incident work and proactive product development
• Communicate clearly with both technical and non-technical stakeholders

Strong Candidates May Also Have

• Experience as a founder or early engineer at an infrastructure-focused startup, where you owned a product end-to-end
• Background in security, sandboxing, or isolation technologies (containers, VMs, seccomp, namespaces, etc.)
• Open-source contributions in the Python ecosystem
• Experience building developer tools, CLIs, or platforms used by other engineers
• History of working on incident response and on-call rotations for production systems
• Exposure to reinforcement learning or model training infrastructure

Representative Projects

These are examples of past work that would indicate a good fit,not a description of the role itself:

• Maintaining an open source SDK through multiple major version upgrades while minimizing breaking changes for users
• Leading an initiative to reduce P0 incidents by XX% through improved error handling, retries, and observability
• Building a developer platform at a startup from zero to product-market fit, iterating based on user feedback
• Embedding with an internal team for a quarter to deeply understand their workflows and shipping targeted improvements to a piece of infrastructure they rely on
• Developing a multi-quarter roadmap for a developer tools product, balancing user requests with technical debt reduction

Logistics

• Minimum education: Bachelor’s degree or an equivalent combination of education, training, and/or experience
• Required field of study: A field relevant to the role as demonstrated through coursework, training, or professional experience
• Minimum years of experience: Years of experience required will correlate with the internal job level requirements for the position
• Location-based hybrid policy: Currently, we expect all staff to be in one of our offices at least 25% of the time. However, some roles may require more time in our offices.
• Visa sponsorship: We do sponsor visas! However, we aren't able to successfully sponsor visas for every role and every candidate. But if we make you an offer, we will make every reasonable effort to get you a visa, and we retain an immigration lawyer to help with this.

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Anthropic's mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems.

About the Role

Anthropic's sandboxing infrastructure enables Claude to safely execute code and interact with external systems. As we expand Claude's capabilities, the reliability, security, and developer experience of this infrastructure becomes increasingly critical. We're looking for an engineer to join the sandboxing team and help shape both the client-side library/API and the underlying infrastructure.

In this role, you'll combine deep infrastructure expertise with an obsession for developer experience. You'll help maintain and evolve a system that must be correct, performant, and intuitive to use. You'll work closely with internal teams to understand their needs, burn down errors and edge cases, and build a roadmap that anticipates where the product needs to go. This is a role for someone who finds satisfaction in both the craft of building reliable systems and the empathy required to serve developers and researchers well.

Responsibilities

• Contribute to the client library, API surface, and underlying infrastructure for Anthropic's sandboxing system, ensuring it is reliable, well-documented, and intuitive to use

• Drive down error rates and improve correctness through systematic debugging, monitoring, and proactive fixes

• Help develop and maintain a product roadmap for sandboxing capabilities, balancing immediate needs with long-term architectural improvements

• Partner closely with internal teams using the sandboxing system to understand their requirements, debug issues, and build tooling that serves their use cases

• Respond to incidents and production issues with urgency, conducting thorough root cause analysis and implementing preventive measures

• Build comprehensive testing, observability, and documentation to ensure the system meets a high quality bar

• Collaborate across the sandboxing team, flexing between client-side and infrastructure work as needed

You May Be a Good Fit If You

• Have 5+ years of software engineering experience, with meaningful time spent maintaining libraries, SDKs, or developer-facing APIs

• Obsess over developer experience—you've thought deeply about API design, error propagation, documentation, and the small details that make a library feel well-crafted

• Have experience operating complex distributed systems

• Bring a track record of systematically improving reliability—you've burned down error budgets, built monitoring, and driven issues to resolution

• Can develop and articulate a long-term vision for a product, translating user feedback and technical constraints into a coherent roadmap

• Are comfortable with ambiguity and can context-switch between reactive incident work and proactive product development

• Communicate clearly with both technical and non-technical stakeholders

Strong Candidates May Also Have

• Experience as a founder or early engineer at an infrastructure-focused startup, where you owned a product end-to-end

• Background in security, sandboxing, or isolation technologies (containers, VMs, seccomp, namespaces, etc.)

• Open-source contributions in the Python ecosystem

• Experience building developer tools, CLIs, or platforms used by other engineers

• History of working on incident response and on-call rotations for production systems

• Exposure to reinforcement learning or model training infrastructure

Representative Projects

These are examples of past work that would indicate a good fit—not a description of the role itself:

• Maintaining an open source SDK through multiple major version upgrades while minimizing breaking changes for users

• Leading an initiative to reduce P0 incidents by XX% through improved error handling, retries, and observability

• Building a developer platform at a startup from zero to product-market fit, iterating based on user feedback

• Embedding with an internal team for a quarter to deeply understand their workflows and shipping targeted improvements to a piece of infrastructure they rely on

• Developing a multi-quarter roadmap for a developer tools product, balancing user requests with technical debt reduction

Logistics

Education requirements: We require at least a Bachelor's degree in a related field or equivalent experience. Location-based hybrid policy: Currently, we expect all staff to be in one of our offices at least 25% of the time. However, some roles may require more time in our offices.

Visa sponsorship: We do sponsor visas! However, we aren't able to successfully sponsor visas for every role and every candidate. But if we make you an offer, we will make every reasonable effort to get you a visa, and we retain an immigration lawyer to help with this.

We encourage you to apply even if you do not believe you meet every single qualification. Not all strong candidates will meet every single qualification as listed. Research shows that people who identify as being from underrepresented groups are more prone to experiencing imposter syndrome and doubting the strength of their candidacy, so we urge you not to exclude yourself prematurely and to submit an application if you're interested in this work. We think AI systems like the ones we're building can have a huge impact on society, and we want to make sure that the people building them are representative of the people they'll be serving.

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We’re looking for a Security Engineering Lead to own and drive Anthropic’s Corporate Security programme. This is a player-coach Tech Lead Manager (TLM) role: you’ll be both the most senior technical individual contributor on corporate security and the people leader for a lean, high-impact team of Security Engineers.

Corporate Security at Anthropic encompasses everything that protects our people, endpoints, networks, SaaS ecosystem, and corporate data—the full surface area outside of production infrastructure. The scope is broad and the team is deliberately small, which means you’ll need deep technical skills across multiple domains, strong judgment about where to invest, and a bias toward automation and engineering-driven solutions over manual process.

You’ll report into Security leadership and partner closely with IT, Infrastructure Security, Detection & Response, and GRC teams. This role is high-visibility and high-autonomy: you’ll be expected to define the roadmap, make architectural decisions, and represent Corporate Security across the company.

Responsibilities:

Technical Leadership & Hands-on Engineering

• Own the security architecture, tooling, and controls for Anthropic’s corporate environment end-to-end, including endpoint fleets (macOS, Windows, ChromeOS), campus and office networks, SaaS applications, mobile devices
• Design, build, and ship security automation, integrations, and internal tooling—including leveraging Claude and LLMs to accelerate security workflows
• Define and enforce security baselines, hardening standards, and configuration policies across all corporate platforms
• Define what it means to operate safely in an environment where AI agents act more like humans than actual humans
• Evaluate, select, deploy, and operate corporate security tools (EDR/XDR, MDM, ZTNA, CASB/SSPM, email security, DLP, browser security, etc.)
• Drive vulnerability management for corporate assets, including patch orchestration, risk-based prioritization, and exception management
• Lead security reviews of new SaaS adoptions, corporate infrastructure changes, and IT projects

People Leadership & Team Building

• Manage, mentor, and grow a purposefully lean team of Security Engineers; set clear expectations, run effective 1:1s, and create an environment where engineers do the best work of their careers
• Hire and build the team as scope expands—own the hiring bar and pipeline for Corporate Security Engineering roles
• Balance your own IC contributions with the team’s needs; know when to go deep on a problem yourself and when to delegate and coach
• Foster a culture of operational excellence, blameless incident review, and continuous improvement

Strategy & Cross-Functional Partnership

• Define and own the Corporate Security roadmap, aligning investments to Anthropic’s risk profile and growth trajectory
• Partner with IT Operations to ensure security is embedded in endpoint provisioning, network design, and SaaS lifecycle management
• Collaborate with Detection & Response on telemetry coverage, detection engineering, and incident handling for corporate-sourced events
• Partner with Infrastructure and Security Engineering teams to ensure security standards are consistent across all of Anthropic
• Communicate security posture, risks, and investment needs to Security leadership and cross-functional stakeholders clearly and persuasively

You may be a good fit if you:

• Have 8+ years of Security Engineering experience in a corporate/enterprise security domain (endpoint security, network security, SaaS security, identity, or a combination)
• Have 2+ years of experience managing or tech-leading a team of engineers, with a demonstrated track record of developing talent and shipping results through others
• Are a strong engineer who still writes code regularly—you can prototype a tool, write a detection, build an integration, or debug a complex configuration issue
• Have deep experience with macOS fleet security (this is our primary platform) and solid working knowledge of Windows and ChromeOS security
• Have hands-on experience deploying and operating EDR/XDR, MDM, ZTNA/zero trust, and identity security solutions at scale
• Understand modern SaaS security challenges: shadow IT, OAuth token sprawl, data exfiltration paths, SaaS-to-SaaS integrations, and SSPM/CASB tooling
• Can work independently with high autonomy, manage ambiguity, and make sound risk-based prioritization decisions in a fast-paced environment
• Have excellent communication skills and can translate complex security topics into clear recommendations for technical and non-technical audiences

Strong candidates may have:

• Securing corporate environments at high-growth AI, cloud, or developer-tools companies
• Maturing a Corporate Security function from early stage, including defining scope, selecting the initial toolset, and hiring the founding team
• Advanced macOS security (system extensions, endpoint security framework, MDM profile engineering, Declarative Device Management)
• Network security architecture for hybrid/multi-office environments, including SD-WAN, ZTNA, DNS security, and network segmentation
• Browser security and isolation technologies (e.g., Island, Talon/Palo Alto, Chrome Enterprise)
• Proficiency in Python, Go, or similar languages for building sec

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We are looking for a Security Architecture Lead to serve as the primary technical authority for Replit's security blueprint. In this Technical Lead capacity, you will steer the architectural direction for a team of security architects and engineers, ensuring our platform is resilient and secure by design.

What You'll Do

Technical Leadership & Mentorship

• Act as the lead technical voice for security architecture, defining the long-term vision and ensuring consistency across complex infrastructure and product projects.
• Provide high-level guidance and mentorship to security engineers, fostering a culture of technical excellence and rigorous security design without the overhead of administrative management.
• Lead cross-functional squads through complex security implementations, from initial design to final production deployment.

Architecture Strategy & Risk Management

• Define and maintain (document) the authoritative 'Source of Truth' for Replit's secure architecture, ensuring these patterns are consistently adopted across all engineering teams.
• Drive the design for secure bootstrapping and multi-layered trust. Enforce isolation principles at every level—from technical containerization and network segmentation to business logic and multi-tenant resource separation.
• Actively identify, document, and quantify architectural security risks. You will be responsible for ensuring these are accurately reflected in the Cybersecurity Risk Register, translating technical debt into actionable risk profiles for executive stakeholders.

Security Design & Review

• Oversee and conduct deep-dive security reviews for core product features and infrastructure, identifying potential threats and mitigating risks early in the development lifecycle.
• Own the architectural strategy for Availability, specifically defending against DoS threats to ensure a highly resilient platform.

Cross-Functional Enablement

• Partner with GRC teams to translate complex architectural designs into clear, audit-ready documentation and control frameworks. Evaluate required controls against architecture and assess readiness for future compliance certifications.
• Act as the technical bridge for the Sales team, addressing complex security inquiries from enterprise customers regarding Replit's architectural integrity.

Required Skills & Experience

• 8+ years of experience in security engineering or security architecture.
• Proven experience as a Technical Lead, steering large-scale projects and guiding the work of other senior engineers.
• Experience writing and maintaining Architecture documents.
• Deep expertise in cloud-native security architecture (GCP experience is a significant plus) for multi-tenant SaaS products.
• Experience designing secure boot, hardware/Cloud-KMS-rooted trust, and multi-layered defense systems.
• Strong understanding of isolation technologies and DDoS mitigation.
• Exceptional ability to communicate technical risk to both engineering and executive audiences.
• Strong track record of contributing to Cybersecurity Risk Register.

What We Value

• Systems Thinking: The ability to see the 'big picture' and understand how security decisions impact the entire stack.
• Technical Influence: The ability to drive technical alignment across the organization through expertise and collaboration rather than direct authority.
• Autonomy: Comfortable leading major technical initiatives and driving outcomes with minimal oversight.
• Problem-Solving Mindset: A passion for breaking down complex security challenges into elegant, scalable engineering solutions.

Full-Time Employee Benefits Include

• Competitive Salary & Equity
• 401(k) Program with a 4% match
• Health, Dental, Vision and Life Insurance
• Short Term and Long Term Disability
• Paid Parental, Medical, Caregiver Leave
• Commuter Benefits
• Monthly Wellness Stipend
• Autonomous Work Environment
• In Office Set-Up Reimbursement
• Flexible Time Off (FTO) + Holidays
• Quarterly Team Gatherings
• In Office Amenities

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