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Nasuni

Senior Security Engineer - Application Security

Remote, United States

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Job details

Experience: Approximately 5+ years of relevant security engineering experience with substantial hands-on AppSec or penetration testing.
Posting language: English
Posted: Nov 2, 2026

Original job description

Senior Security Engineer - Application Security

Location: United States - Remote | Department: Security | Reports to: Chief Information Security Officer

Role overview

Nasuni is seeking a Senior Security Engineer specializing in application security and penetration testing to protect our growing portfolio of enterprise data infrastructure and SaaS products. You will identify and validate vulnerabilities, conduct penetration tests, guide secure design decisions, and work with Engineering to remediate and retest findings across Nasuni products, Resilio, DryvIQ, cloud services and emerging AI-enabled capabilities.

Scope and impact

You will independently execute complex security assessments, coordinate assigned testing initiatives, and recommend risk-based priorities within established security standards. This hands-on role combines technical judgment, practical automation, and cross-functional influence.

Responsibilities

Conduct threat modeling, secure design and targeted code reviews for web applications, APIs, cloud services and appliances.
Perform manual and tool-assisted penetration testing; document reproducible findings and verify fixes.
Coordinate external penetration-test scoping, execution, report quality review, remediation tracking and retesting.
Validate customer-reported vulnerabilities and advise Engineering on prioritization, mitigation and closure.
Improve SAST, SCA, secrets detection, container scanning and CI/CD security workflows with engineering partners.
Support SBOM and software supply-chain vulnerability impact analysis.
Assess AI-enabled product features for access-control weaknesses, prompt injection and unintended data exposure.
Use approved AI-assisted tools for test planning, code analysis and research; independently verify outputs and protect confidential data.
Share practical security guidance and improve repeatable assessment processes.

Must-have qualifications

Approximately 5+ years of relevant security engineering experience with substantial hands-on AppSec or penetration testing.
Demonstrated manual testing of web applications and APIs, including authentication and authorization issues.
Experience with threat modeling, secure code review, vulnerability validation and remediation retesting.
Experience coordinating third-party penetration tests and reviewing technical findings.
Practical knowledge of OWASP guidance, security testing tools and application security controls in the SDLC.
Ability to read code and automate tasks using a relevant programming or scripting language.
Working knowledge of cloud services, Linux, containers or Kubernetes; effective technical communication.

Preferred qualifications

Enterprise SaaS, hybrid-cloud or appliance security experience.
SBOM, CycloneDX/SPDX, supply-chain security and CI/CD tooling experience.
LLM or agentic feature testing, M&A assessments, or audit evidence preparation.
OSCP, GWAPT, GPEN, GWEB, CSSLP or equivalent demonstrated skills.

Ideal differentiators

Independently discovered complex flaws and verified remediation; improved repeatable security workflows; balanced risk across SaaS and hybrid infrastructure; responsibly applied AI-assisted analysis with demonstrable validation.

Experience guidelines

Five or more years of relevant experience is typical, with meaningful direct responsibility for application security assessments. Equivalent demonstrated expertise is valued. A related degree or equivalent practical experience is welcome.

Success measures

90 days: establish findings, testing environment and remediation visibility. Six months: deliver risk-based internal testing and improve threat-modeling consistency. Twelve months: coordinate the annual external assessment and show measurable remediation progress.

About Nasuni

Nasuni is the unstructured data foundation for enterprise teams - and the AI that supports them. We manage, protect, and activate the world’s unstructured data so organizations can work smarter, spend wisely, and create safely without limits. As a Vista-backed SaaS data infrastructure company, Nasuni is transforming how enterprises manage file data with a next-generation, AI-ready platform - turning massive file stores into secure, actionable, and AI-ready data for intelligent automation, analytics, and global collaboration.

Why work at Nasuni?

As part of our commitment to your well-being, we are pleased to offer comprehensive benefits packages to employees across the US. Benefits packages generally include:

Best in class employee onboarding and training
"Take What You Need” paid time off policy
Comprehensive health, dental and vision plans
Company-paid life and disability insurance
401(k) and Roth IRA retirement plan
Generous employee referral bonuses
Flexible remote work policy
10 Paid Holidays
Wide array of wellbeing offerings
Pre-tax savings accounts with company contributions
Great team culture and social activities
Collaborative workspaces
Free on-site fitness centers and stocked kitchens in select office locations
Professional development resources

Compensation Transparency:

In accordance with U.S. pay transparency laws, Nasuni is committed to providing visibility into compensation for all U.S.-based roles. Click HERE to view our compensation ranges by job grade. Actual compensation will be based on a variety of factors, including a candidate’s experience, skills, education, and work location.

To all recruitment agencies: Nasuni does not accept agency resumes. Please do not forward resumes to our job boards, Nasuni employees or any other company location. Nasuni is not responsible for any fees related to unsolicited resumes.

Nasuni is an equal opportunity employer. The equal employment opportunity policy at Nasuni protects employees and job applicants from discrimination on the bases of race, religion, color, sex (including pregnancy, gender identity, and sexual orientation), parental status, national origin, age, disability, family medical history or genetic information, political affiliation, military service, or other non-merit based factors. These protections extend to all management practices and decisions, including recruitment and hiring practices, appraisal systems, promotions, and training and career development programs.

This privacy notice relates to information collected (whether online or offline) by Nasuni Corporation and our corporate affiliates (collectively, “Nasuni”) from or about you in your capacity as a Nasuni employee, independent contractor/service provider or as an applicant for an employment or contractor relationship with Nasuni.

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More about this job

Skills

Penetration testing
Security regulations
Prioritization
CI/CD
Supply chain management
Research
Linux
Kubernetes
Communication skills

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