Sr. Staff Back-End AppSec Engineer at SentinelOne

United States

$184k - $230k

Our Purpose At SentinelOne, we are driven by a clear purpose: to give the advantage to those who secure our future. As AI reshapes how organizations build, operate, and innovate, the responsibility to protect them becomes more critical than ever. When you join SentinelOne, your work helps protect global enterprises, critical infrastructure, and the technologies shaping tomorrow. If you are motivated by meaningful challenges and want your impact to be real, measurable, and global, you will find purpose here. About Us SentinelOne is a company at the intersection of AI and security, pioneering a new operating model for cybersecurity. Our AI-native platform unifies protection across endpoint, cloud, identity, data, and AI systems to deliver autonomous detection and response with clarity and speed. By combining real-time analytics, intelligent automation, and a unified data foundation, we reduce noise, simplify complexity, and empower security teams to focus on what truly matters. Our teams are builders, problem-solvers, and innovators committed to shaping the future of security. If you are excited to solve hard problems alongside talented, mission-driven people, we invite you to help us build a safer future for humanity. What Are We Looking For? We’re looking for people who are relentlessly curious and committed to continuous learning. AI is reshaping every function across our business, and we enable every team member, regardless of role or level, to build fluency in AI tools and concepts. Those who thrive here actively seek out new solutions, experiment thoughtfully, and apply what they learn to drive better, faster, smarter outcomes. As a​ Sr. Staff Back-End AppSec Engineer you will be tasked with​ becoming the trusted advisor customers turn to on Python and NodeJs stacks when the stakes are highest. You'll work directly on top of the output of our agentic code scanning pipeline, validate findings with human judgment, deliver results to diverse technical and leadership audiences, and shape the methodology that scales the practice. What Will You Do? Primary responsibilities include: Lead Wayfinder Frontier AI Services customer engagements end-to-end, scope the work, deliver the technical findings, and present results to executive and technical stakeholders. Review and triage findings from our agentic code scanning pipeline against customer Python and JS codebases. Validate true positives, eliminate noise, and ensure every finding that reaches the customer is a decision they can act on. Conduct deep code review across Python and Node.js code and common frameworks. Present findings to stake holders, translate technical risk into business impact and map exposures into end-to-end exploitation chains. Author and maintain SAST rule packs that scale across the customer base, and partner with our AI/ML engineers to improve our agentic scanning engine. Provide expert remediation guidance to customer development teams and validate fixes through follow-up review. Work closely with our engineering teams to enhance our agentic code scanning pipeline, and reduce false positives. Mentor Senior-level AppSec engineers and dev-skilled threat hunters; raise the technical bar of the practice and shape the service line's methodology, engagement playbooks, and scoping templates. What Skills And Knowledge Will You Bring? Ideal candidates will have: 7+ years in application security or product security with a strong software development background. Proven track record translating complex findings into technical and executive-level debriefs. Excellent written and verbal communication is essential. Experience delivering customer-facing or consulting-style engagements end-to-end, comfortable in a distributed remote organization. Expert-level Python backend stack; Django, Flask, FastAPI Expert-level Node.js / TypeScript; Express, NestJS. Working knowledge of front-end framework (React, Next.js, or Angular) and can follow how auth, CSRF, and data move between the client and the API. Mastery of OWASP Top 10, CWE Top 25, and modern authentication infrastructure (SAML, OAuth, OIDC, JWT internals). Hands-on experience authoring custom static-analysis rules and queries for modern SAST engines; familiarity with AI-assisted code review workflows and validating findings produced by automated and agentic analysis pipelines. Working knowledge of Python and JS packaging and dependency-resolution behaviors (pip/Poetry/uv; npm/pnpm/yarn) and the supply-chain failure modes specific to each. Fluency with Git-based source control and CI/CD pipelines, including build-pipeline security controls, runner hardening, and release-gate enforcement. Experience with AI accelerated development / code scanning methodologies. Why SentinelOne? AI is redefining how the world operates and rewriting the rules of security in real time, and SentinelOne was built for this moment. From day one, we architected an AI-native platform designed to operate at machine speed, not as an add-on to legacy systems but as the foundation itself. If you want to build where innovation and impact move together, this is that place. We invest in our Sentinels with comprehensive, competitive benefits designed to support you and your family: Equity & Rewards Restricted Stock Units (RSUs) Employee Stock Purchase Plan (ESPP) Time Off & Wellbeing Flexible time off Paid company holidays and paid sick time Gender-neutral parental leave Grandparent leave Insurance & Financial Security Medical, dental, and vision coverage 401(k) retirement plan with company match Life and disability insurance Health and dependent care FSA Voluntary benefits (hospital, accident, critical illness) Employee Assistance Program (EAP) ARAG pre-paid legal Nationwide pet insurance Cancer Care program Global business travel medical insurance Work Perks & Flexibility Home office allowance Mobile phone reimbursement Wellness & Lifestyle Wellness coach Wellness/gym reimbursement Fertility coverage Adoption & surrogacy reimbursement This U.S. role has a base pay range that will vary based on the location of the candidate. For some locations, a different pay range may apply. If so, this range will be provided to you during the recruiting process. You can also reach out to the recruiter with any questions. Base Salary Range $184,000—$230,000 USD SentinelOne is proud to be an Equal Employment Opportunity and Affirmative Action employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. SentinelOne participates in the E-Verify Program for all U.S. based roles.