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Senior Systems Engineer
EUV Tech
Martinez, CA
- $150,000 to $175,000 USD / year
The Senior Systems Engineer will refine hardware, software, and controls based on meticulously tested performance data, ensuring the reliability of integrated components in EUV Tech tools.…
Added 4 mins ago
Senior Systems Engineer
Lingo US Inc
CA
Create and maintain interface control documentation to ensure robust integration between hardware, and data systems.
Added 4 mins ago
DO
Senior Safety Engineer
Department of Industrial Relations
CA
- $11,427 to $14,298 USD / month
The Senior Safety Engineer (SSE) is a working safety engineer responsible for the development of the State's occupational safety and health standards, with primary emphasis on occupational…
Added 6 mins ago
Scientist, DSCS Digital Technologies–Laboratory Automation, Automation Systems Engineer (Hybrid)
Merck
Rahway, NJ
Within DSCS, the DSCS Digital Technologies (DDT) team is building the next generation of data-rich, connected lab environments - where hardware, software, and AI-driven tools work together…
Added 6 mins ago
Senior Scientist, DSCS Digital Technologies–Laboratory Automation, Automation Systems Engineer (Hybrid)
Merck
Rahway, NJ
Within DSCS, the DSCS Digital Technologies (DDT) team is building the next generation of data-rich, connected lab environments - where hardware, software, and AI-driven tools work together…
Added 6 mins ago
Engineering Project Manager, Sensors
Lyntris
Mullica Hill, NJ · Falls Church, VA · Bloomington, IN · Panama City Beach, FL
…the Program Manager's total program authority or the Chief Engineer's technical approval authority. Contractual commitments, funding changes, material scope adjustments, technical baseline…
Added 7 mins ago
Engineering Manager, DevOps - Moveworks
ServiceNow
Mountain View, CA
It all started when engineer Fred Luddy wrote code that automated a tedious task for his coworker, Phyllis. She cried tears of joy. That moment inspired Fred to build a company that could…
Added 8 mins ago
AU
Lead Protection & Control Engineer
AtkinsRealis USA Inc.
United States
- $95,000 to $140,000 USD / year
We are seeking a Lead Protection & Control Engineer to join our client's office in Rochester, NY.
Added 8 mins ago
AU
Structural Engineer, Power & Industrial
AtkinsRealis USA Inc.
United States
- $100,000 to $140,000 USD / year
We're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's infrastructure and energy systems. Together,…
Added 8 mins ago
Principal Software Development Engineer in Test
SAIC
Remote, United States
JRE is a combat-proven data link gateway that plays a vital role in the defense of the United States and our allies by extending the reach of tactical data across the battlespace and around…
Added 10 mins ago
Enterprise Architect - Data Engineer
Arcfield
McLean, VA
The Data Engineer works on unusually complex technical problems, develops highly innovative solutions, and exercises considerable independence in determining the approaches necessary to…
Added 10 mins ago
Fire Control Systems Engineer
Arcfield
Dahlgren, VA
The Fire Control Systems Engineer will be part of a team supporting the Strategic Systems Programs (SSP) office on the development of the Sea Launched Cruise Missile-Nuclear (SLCM-N) Fire…
Added 11 mins ago
Software Engineer
Pivotal Systems
Fremont, CA
Pivotal Systems is looking for a Software Engineer to join our engineering team in Fremont, CA. This is a versatile, hands-on role for an engineer early in their career: you'll build Python…
Added 12 mins ago
Process Engineer
Flextronics International USA, Inc.
CA
To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add a Process Engineer located in Milpitas, CA
Added 12 mins ago
Technical Director, Transportation Project Manager
WSP
South Jordan, UT
…financial performance, adherence to project management and quality control plans, and adequacy of risk management…
Added 12 mins ago
TC
Engineering Aide/Engineering Technician
The County of El Dorado
Placerville, CA
- $28.58 to $38.62 USD / hour
Performs basic traffic engineering and erosion control studies, including data analysis and preparation of road construction and improvement recommendations.
Added 16 mins ago
Quality Planning Engineer
USA.Plansee USA LLC
Franklin, MA
Develop and maintain risk‑based Inspection Plans / Inspection Control Plans (ICPs) covering incoming, in‑process, final, and special inspections.
Added 17 mins ago
Network and Systems Sr. Analyst, APC DCS
Toledo Refining Co.LLC
OH
…related facilities. We are seeking a talented Advance Process Control DCS Systems Analyst to join our team as a pivotal member that would play a key role here at PBF Energy. This role would…
Added 17 mins ago
BA
Data Security Engineer, Senior
Booz Allen Hamilton
Colorado Springs, CO
- $86,800 to $198,000 USD / year
Architect, deploy, and configure data security solutions across various clients for DoD, IC, and civilian federal clients. Create new architectures to meet client requirements adhering to…
Added 17 mins ago
BA
Data Security Engineer
Booz Allen Hamilton
Colorado Springs, CO
- $99,000 to $225,000 USD / year
Knowledge of Trusted Data Format (TDF) and Attribute-Based Access Control (ABAC)
Added 17 mins ago
BA
Full Stack Modeling and Simulation Software Engineer
Booz Allen Hamilton
Colorado Springs, CO
- $69,300 to $158,000 USD / year
…dashboards, and decision-support tools supporting exercise control, Master Scenario Events List (MSEL) management, inject tracking, white-cell coordination, assessment, and after-action…
Added 18 mins ago
Engineering Manager, Streaming Infrastructure
Airbnb
United States
Much of that data still moves through bespoke pipelines that each team builds and runs differently. We’re replacing them with one declarative, self-serve platform. You define your data…
Added 22 mins ago
Sr. Engineering Technician
TECHTRONIC CORDLESS GP
Menomonee Falls, WI
…will oversee lab operations, conduct advanced testing, perform data analysis and mentor junior staff to support engineering initiatives. The senior-level role requires a blend of technical…
Added 23 mins ago
Engineer 3, UX/UI
BlueForge Alliance
Remote, United States
The Full Stack (UI/UX) Engineer 3 will have strong foundational software engineering capabilities with a focus in front-end software development. This position will lead BlueForge…
Added 23 mins ago
Senior Manufacturing Engineer, New Product Introduction (NPI)
Firestorm
United States
Senior Manufacturing Engineer, New Production Introduction (NPI)

Horizon3

Senior Full-Stack Engineer, Autonomous Defense

Remote, United States

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

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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.

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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

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