Senior Customer Onboarding Engineer
Confirmed on the employer's own hiring board on Oct 19, 2026. First seen by Alion on Sep 29, 2026. Horizon3 scores B on the Alion truth index.
Get to Know Us
Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs.
We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results.
Role summary
We are hiring a Customer Onboarding Engineer with 5+ years of hands-on enterprise experience. You will be the technical owner of a new customer’s first 30 days: taking the account from sales handoff to successful production deployment of the NodeZero platform.
This role requires the same technical depth as a Senior Technical Support Engineer-cloud, Linux, networking, containers, identity, and security-but the primary work is time-boxed implementation for new customer onboarding. You will still diagnose hard problems, do root-cause analysis, and write the knowledge that Support needs. When bandwidth allows, you will assist the larger Horizon3 support team with standard support case management and resolution.
You should be a self-directed engineer who can juggle multiple enterprise engagements with little supervision, working cross functionality with key internal and customer stakeholders to successfully deploy the NodeZero platform and ensure realized customer value.
What you will do
Own the onboarding
Lead kickoff with the customer and internal account team. Confirm scope, environments, owners, identity/access path, compliance constraints, and go-live criteria.
Project-manage the 30-day plan. Track blockers (credentials, firewall changes, IdP claims, change windows).
Provide best practices expertise and assist in deployment and optimization of the customer environment.
Ensure successful production deployment against the customers initial testing goals as success criteria for the onboarding.
Technical Implementation
Diagnose and resolve implementation failures across cloud infrastructure, networking, and security with the same rigor used on escalated support tickets.
Perform root-cause analysis on first-time integration and deployment issues so the same failure does not recur after handoff.
Work in Linux production environments: server configuration, performance tuning, security hardening, and troubleshooting.
Deploy and manage containerized workloads with Docker and orchestrated environments such as Kubernetes.
Provision and troubleshoot pentest configuration AWS, Azure, or GCP.
Assist in troubleshooting network issues that commonly block go-live: TCP/IP, firewalls, VPNs, load balancers, etc.
Configure and validate identity paths required for onboarding: RBAC, SSO (OAuth, SAML), and directory services (Active Directory, LDAP).
Apply NodeZero expertise in scoping and configuring initial tests.
Work across the company
Collaborate with CS, Engineering, Product, and Sales to unblock implementation issues that are bigger than a single customer.
Advocate for customer specific changes or product improvements as required.
Mentor junior onboarding or support engineers on first-time deployment patterns.
Stay current on cloud, container, and security practices
Required qualifications
Bachelor’s degree in Computer Science, Information Technology, Engineering, or a related field, or equivalent professional experience.
5+ years in technical support, systems administration, cloud operations, implementation, or a similar enterprise role, ideally supporting large-scale or Fortune 500 deployments.
Background in cybersecurity, including threat detection, vulnerability management, encryption standards, and compliance frameworks such as SOC 2 or GDPR.
Strong Linux administration in production: configuration, performance tuning, hardening, and troubleshooting.
Hands-on Docker and containerization experience, including building, deploying, and managing applications in orchestrated environments (Kubernetes or similar).
Solid working knowledge of AWS, Azure, or GCP and IaC tools such as Terraform, Ansible, or CloudFormation.
In-depth networking fundamentals: TCP/IP, firewalls, VPNs, load balancers, and tools such as Wireshark and tcpdump.
Basic scripting in Bash, Python, or PowerShell for automation, diagnostics, and workflow support.
Demonstrated self-learning: labs, certifications (for example AWS Solutions Architect, Linux+, or equivalent), personal projects, or open-source work.
Experience comparable to a junior cloud administrator in an enterprise setting: multi-tenant environments, resource allocation, and compliance requirements.
Familiarity with identity management: RBAC, SSO (OAuth, SAML), and directory services (Active Directory, LDAP).
Basic database literacy: relational vs. schemaless stores, schema, querying, and light administration.
Ability to run a customer-facing technical engagement to a 30-day finish line with minimal supervision.
Preferred qualifications
Proven experience integrating and troubleshooting APIs, including REST services, authentication mechanisms, and API-driven automations in enterprise applications.
Familiarity with observability tools such as Datadog for monitoring, logging, and alerting in distributed systems.
Basic experience with managed databases such as Amazon RDS: setup, backups, scaling, and query optimization.
Broader coding ability in Python, JavaScript, or Go, including custom tools or scripts that automate implementation or support work.
Prior onboarding, professional services, or TAM work with a defined time-to-go-live.
Experience creating reusable assets: validation scripts, Terraform modules, Datadog dashboard/alert packs, and customer-ready runbooks.
Success measures
On-time go-live rate within the 30-day window
Customer confirmation that core workflows are implemented and able to be run independently
Reduction in hours for the next similar onboarding through scripts, templates, and playbooks
Perks of Horizon3
Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.
Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities.
Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.
Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence.
Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave.
Compensation and Values
At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations.
In accordance with various State’s transparency regulations, we provide the following salary range information for this position:
Base salary range: $126,000 - 140,000 annually. The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills.
Additional compensation: All full-time roles are eligible for an equity package in the form of stock options.
You Belong Here
Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, hair length or any other legally protected status by law.
Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth.
We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless.
Other Duties
Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.
Application Note
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