Jobs in the United States

25+ jobs

Save this search

Added 13 mins ago
Principal Hydroelectric Pumped Storage Engineer
Worley Parsons
Reading, PA
…solutions. Purpose: The Principal Hydroelectric Pumped Storage Engineer provides engineering expertise for the operation, maintenance, modernization, and reliability improvement of…
Added 14 mins ago
Staff Software Engineer - IAM
General Motors
Harrisburg, PA
We’re looking for a Security Software Engineer to join the Security Products Engineering team and drive the design and implementation of security-focused software and services across GM.…
Added 14 mins ago
Google Cloud Platform - SRE Manager
Huntington National Bank
Pittsburgh, PA
Google Cloud Platform (GCP) Site Reliability Engineer (SRE) Manager is responsible for supporting the GCP framework and consumers of the platform. The position reports to the Chief…
Added 14 mins ago
Data Engineer - AI-Enabled Capacity Analytics
Comcast
Philadelphia, PA
…candidates who live greater than 100 miles from the office for the remote…
Added 18 mins ago
Presales Solutions Engineer - SecOps/SIEM
SHI International Corp
Home Office, CA · Home Office, WA · Home Office, OR · Home Office, CO
The Presales Solutions Engineer – SecOps/SIEM is a customer-facing security expert who takes a consultative approach to helping customers design and implement effective security operations…
Added 31 mins ago
Sr. Instructor, Training- Cloud Security (Remote)
CrowdStrike, Inc.
Remote, United States
As a global leader in cybersecurity, CrowdStrike protects the people, processes and technologies that drive modern organizations. Since 2011, our mission hasn’t changed - we’re here to stop…
Added 58 mins ago
Cloud Infrastructure Engineering Specialist
Altamira Technology Corporation
Suitland, MD
Position Location: Remote /Joint Base Andrews
Added 58 mins ago
Google Cloud Platform - SRE Manager
Huntington National Bank
Hagerstown, MD
Google Cloud Platform (GCP) Site Reliability Engineer (SRE) Manager is responsible for supporting the GCP framework and consumers of the platform. The position reports to the Chief…
Added 1 hour ago
C
Software Engineer Data & AI II (Full Time) – United States
Cisco
San Jose, CA · Austin, TX · RTP, NC
- Full-time
This role may be eligible for remote work in the United States depending on business needs and hiring manager approval.
Added 1 hour ago
Mid-Level Model Based Systems Engineer
PMAT
Remote, United States
About the role: PMAT is seeking an experienced mid-level Model-Based Systems Engineer (MBSE) to support enterprise architecture development, digital engineering, and system-of-systems (SoS)…
Added 1 hour ago
Consulting Architect
Elastic
United States
Professional Expertise: 5+ years as a consultant, architect, or engineer with deep expertise in Search, observability & monitoring, and a strong capability in security domains.
Added 1 hour ago
A
Senior AI Engineer
Arine
Remote, United States
- $170,000 to $190,000 USD / year
…adherence, and optimize interventions at scale. As a Senior AI Engineer, you will play a key role in designing, building, and deploying AI-powered solutions that enhance clinician…
Added 2 hours ago
Senior Principal Software Application Security
The Huntington National Bank
Remote, United States
This position is a remote position. (see preferred location options on posting)
Added 2 hours ago
Senior Cloud Security Engineer
Peraton
Remote, United States
Peraton is looking for a Senior Cloud Security Engineer to lead proactive threat hunting, vulnerability analysis, and remediation in support of a multi-cloud environment with 70+ customer…
Added 2 hours ago
Staff Endpoint Engineer
SmithRx
Plano, TX
SmithRx is seeking a visionary and highly strategic Staff Endpoint Engineer to serve as the overarching technical authority and architect for our enterprise endpoint infrastructure, vendor…
Added 3 hours ago
Information Assurance / Security Engineer - MID-Level
Arcfield
Middleton, RI
Collaborate with system administrators, engineers, ISSMs, and ISSOs to resolve cybersecurity findings.
Added 3 hours ago
BA
Data Security Engineer, Senior
Booz Allen Hamilton
Colorado Springs, CO
- $86,800 to $198,000 USD / year
Knowledge of engineering across cybersecurity, networking, operating systems, identity, cloud, and enterprise infrastructure
Added 3 hours ago
BA
Data Security Engineer
Booz Allen Hamilton
Colorado Springs, CO
- $99,000 to $225,000 USD / year
Knowledge of engineering across cybersecurity, networking, operating systems, identity, cloud, and enterprise infrastructure
Added 3 hours ago
Senior Software Engineer, Connectivity
Phaidra
Remote, United States
Phaidra was founded in 2019 by former Google, DeepMind, and Trane engineers. Our team brings deep experience in AI, cybersecurity, mission-critical cooling, data centers, and industrial…
Added 3 hours ago
S
Staff Perimeter Defense Engineer
SSB&T
Boston, MA · Princeton, NJ · Clifton, NJ · Austin, TX
- $120,000 to $202,500 USD / year
We are looking for a Staff Perimeter Defense Engineer reporting into the Defensive Engineering leadership team within Global Cyber Security (GCS). You will lead the strategy, architecture,…
Added 3 hours ago
DevOps Engineer
Stored Energy Systems
Longmont, CO
We are seeking a highly motivated DevOps Engineer to support the development, deployment, automation, and lifecycle management of software platforms related to battery sensing technology,…
Added 3 hours ago
GI
Network Engineer
Goldbelt, Inc.
Remote, United States
- $112,700 to $137,750 USD / year
The Network Engineer is responsible for the design, implementation, maintenance, and optimization of enterprise network infrastructure supporting Goldbelt, Inc. and its subsidiaries. This…
Added 3 hours ago
Senior Platform Engineer - w/active Top Secret clearance
LMI
Washington, DC, DC
LMI is seeking an experienced Senior Platform Engineer to lead the design and integration of hybrid cloud and on-premises computing platforms supporting federal customers and classified…
Added 3 hours ago
G
Network Engineer
Goldbelt
Remote, United States
- $112,700 to $137,750 USD / year
The Network Engineer is responsible for the design, implementation, maintenance, and optimization of enterprise network infrastructure supporting Goldbelt, Inc. and its subsidiaries. This…
Added 4 hours ago
Senior Engineer - Enterprise AI Risk (Remote)
United Airlines
Chicago, IL
The Responsible AI Tech Senior Engineer’s primary responsibility is to implement the proper security infrastructure and technological integrations to enable the needs of both Cybersecurity…

Horizon3

Senior Full-Stack Engineer, Autonomous Defense

Remote, United States

$195,000 to $235,000 USD / year

Apply About employer

Applications open in a new tab.

Job details

Pay: $195,000 to $235,000 USD / year
Posting language: English
Posted: Nov 3, 2026

Original job description

Get to Know Us

Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find, 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 IT Ops/SecOps teams, consulting pentesters, and MSSPs and MSPs.

We are a fusion of former U.S. Special Operations cyber operators, startup engineers & operators, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools and 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.

What You'll Do

As a Senior Full-Stack Engineer on the Autonomous Defensive team, you'll build the platform that NodeZero's defensive agents run on. Our AI researchers define what these agents should reason about, you build the systems that make that work in production, across thousands of customer tenants, without breaking anything.

That means real distributed systems problems, not glue code. They execute inside customer environments under tight isolation, credential, and egress constraints. And when an agent proposes a change in production, the platform has to be able to simulate it, stage it, gate it on approval, roll it back, and prove after the fact exactly what happened and on whose authority.

It also means the interfaces that sit on top of all of that. Autonomous systems are only trusted to the extent that people can see what they did and intervene before they do it, and that burden lands on the front end. These surfaces are part of the product, not a thin layer over the API, and you'll own them end to end alongside the backend they talk to.

This is a platform role. You'll own the runtime, the tool layer, the orchestration, the connector framework, and the observability and UI that make agent behavior debuggable. We're looking for engineers with strong backend depth who are comfortable building the front end when the workflow demands it - not because it's beneath them, but because they understand the value of end-to-end delivery. You'll work closely with our AI researchers, but you are not being hired to tune prompts - you are being hired to build the substrate that makes their work shippable and safe.

Responsibilities

Build and own the agent execution runtime: durable, resumable, long-running workflows with checkpointing, idempotent steps, cancellation, and timeouts at both the step and run level.
Design and implement the tool layer that agents act through - a registry with versioning, schema validation, per-tenant enablement, and authorization enforced server-side rather than by the model.
Build the connector framework for third-party security control planes (EDR, firewall, identity, SIEM, cloud IAM).
Implement the safe-change pipeline: dry-run and simulation, blast-radius classification, approval gates for high-impact actions, staged rollout, rollback, and an immutable per-tenant audit trail.
Build the operator-facing front end in React and TypeScript, turning dense system state into interfaces a user can reason about and act on with confidence.
Build the client-side data and streaming layer that keeps those interfaces accurate against long-running, incrementally updating state, over WebSockets rather than polling.
Extend NodeZero's tenant isolation model to agents that take write actions, covering execution boundaries, egress control, quotas, and cross-tenant leakage in caches, indexes, and logs.
Develop core product features in ETL and GraphQL to support data processing and retrieval for agent context, run history, and remediation state.
Build the ETL pipelines that turn pentest and remediation outcomes into the datasets our researchers train and evaluate against.
Instrument everything. Distributed tracing across an agent run, cost and token accounting per tenant, and the tooling to answer "why did the agent do that" without guessing.
Partner with AI researchers, attack engineers, and product to take capabilities from prototype to production, and feed platform constraints back into research direction early rather than late.

Required Education / Experience

Bachelor's Degree in Computer Science, Computer Engineering or related field.
7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc).
Proven experience delivering backend APIs, especially GraphQL, and consuming them from a modern web stack.
Production experience with React, TypeScript, and modern CSS layout, with the judgment to build a usable interface for a complex workflow without a designer holding your hand.
Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes.
Expert proficiency in SQL.
Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure.
A track record of shipping and operating production services, including on-call ownership.

What Sets You Apart

Experience building agentic or LLM-backed systems in production
Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself.
Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering.
Experience integrating a long tail of third-party APIs behind a normalized abstraction.
Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM.
Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends.
Experience with client-side data and streaming patterns - React Query or Apollo, GraphQL subscriptions, WebSockets - against long-running, incrementally updating state.
Experience building operator-facing or admin interfaces where density, auditability, and getting the destructive action right matter more than visual polish.
Experience with observability tooling (Datadog, Prometheus, Grafana) and distributed tracing.
Awareness of prompt injection and untrusted-input handling in systems where an agent consumes data from the environment it operates in.

Travel Required

We are a fully remote company, and this job may require up to 5% of travel to be successful.

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: $195,000- $235,000 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.

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.

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

In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.

Apply About employer

More about this job

Skills

Cybersecurity
Direct inward dialing
Workflow
Identity and access management
React
TypeScript
Data engineering
GraphQL
Process data
Research
Computer science
Computer engineering
Python
Go
Scala
C++
CSS
Cloud computing
AWS
Microsoft Azure
Google Cloud
Docker
Kubernetes
SQL
PostgreSQL
Neo4j
Datadog
Prometheus
Grafana

Report this job