Senior Enterprise Security Engineer

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Thumbtack

WebsiteLinkedInAll Job Openings

1001 - 5000 employees

🏪 Marketplace

☁️ SaaS

💰 $75M Debt Financing - Thumbtack on 2024-07

Marketplace • SaaS

Thumbtack is an online marketplace that connects homeowners with local service professionals for home maintenance, repairs, remodeling, and other home projects. The platform lets customers describe projects in their own words, browse local pros across many trades (e. g. , cleaners, handymen, plumbers, electricians, painters, HVAC, contractors, landscapers), view reviews and cost estimates, message pros without sharing contact details until messaging, and offers a guarantee up to $2,500 if a job isn't done as agreed. Thumbtack provides consumer-facing apps and a separate pro-focused experience with resources, community, and tools for professionals to manage leads and reviews. It covers every county in the U. S. and emphasizes project guides, cost guides, and home maintenance plans.

📋 Description

• This role focuses on improving AI-adjacent security at Thumbtack, including the agents, identities, integrations, and data pipelines that modern AI systems depend on. It also covers broader security engineering work across the enterprise platforms and services that support them. • Deliver high-quality security assessments and threat models for first-party and third-party AI tools, agents, and AI-integrated systems, ensuring they adhere to enterprise security principles and approved patterns, with sound authentication, authorization, data access, and observability by design. • Design and validate technical guardrails and reusable patterns that keep AI usage safe at Thumbtack. This spans AI behavior (safe defaults for agent actions, tool and permission scoping, human-in-the-loop boundaries for sensitive access, input and output controls, audit and observability) and AI connectivity (MCP servers, integrations, trust boundaries, and the data pipelines that feed first- and third-party AI systems). Contribute to the frameworks and tooling that support secure AI development and use across Thumbtack. • Harden IAM across the enterprise, with particular focus on the non-human and delegated identities behind AI systems (service accounts, agent credentials, SaaS-to-SaaS OAuth, and SCIM federation). Bring least-privilege and lifecycle hygiene to identities that increasingly act at machine speed. • Provide broader security engineering support across Thumbtack's enterprise platforms and services, including SaaS security and posture management, third-party and integration security, data governance, endpoint security, and identity-centric controls. Build paved paths, shared tooling, and automation that scale these controls. • Lead cross-functional security initiatives end-to-end. Partner with IT, Engineering, Legal, Privacy, Procurement, and business stakeholders to surface risk early, set clear requirements, and support scalable adoption of secure patterns. Conduct security design and architecture reviews for enterprise applications, SaaS platforms, and internally developed systems. • Mentor engineers and partner-team members, raising the overall security bar through guidance and example. • Support security incident response and drive learning through post-incident analysis.

🎯 Requirements

• 6+ years of experience in security engineering, enterprise security, application security, cloud security, or a related field. • Experience developing threat models and proposing technical guardrails for AI tooling and agentic systems, including non-human identities, tool/permission scoping, and safe defaults for agent behavior. • Deep expertise in modern enterprise security disciplines: authentication and authorization (SSO, OAuth/OIDC, SAML, federation, SCIM), API security and token handling, secrets management, least-privilege design, SaaS security and posture management. • Strong experience evaluating risk and conducting security design and architecture reviews across enterprise applications, SaaS platforms, integrations, and internally developed systems, including evaluating data flows, third-party integrations, trust boundaries, automation platforms, AI-connected workflows, and emerging integration patterns such as MCP. • Strong experience securing modern, cloud-native systems (AWS and/or GCP) and familiarity with core control domains such as audit logging, encryption, access control, data retention, and incident response. • Strong sense of ownership and accountability, balancing hands-on technical execution with the ability to mentor others, raise standards, and drive measurable improvements in enterprise security. • Excellent written and verbal communication skills, with the ability to influence without authority and translate technical risk into clear requirements and actionable guidance for both technical and non-technical audiences.

🏖️ Benefits

• Thumbtack embraces diversity. • Equal opportunity workplace. • Reasonable accommodation to individuals with disabilities.