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Added 1 min ago
Member of Deployment Staff - Public Sector
Reflection
New York City, NY · San Francisco, CA
- 5+ years of relevant experience delivering technical systems, including 2+ years in a technical leadership role (e.g., tech lead, engineering manager or founding engineer).
Added 1 min ago
Senior Presales Systems Engineer - HPE Networking
HPE
San Diego, CA
We are seeking a Senior Presales Systems Engineer with deep expertise in networking, security, cloud architecture, and automation to support enterprise and federal customers across complex…
Added 7 mins ago
Sr Leader, SDET
loanDepot
Plano, TX
Minimum five (5) + years of experience in a Lead SDET, Principal Engineer, Architect, Staff Engineer or comparable technical leadership role.
Added 16 mins ago
Senior Presales Systems Engineer - HPE Networking
Hewlett Packard Enterprise
San Diego, CA
We are seeking a Senior Presales Systems Engineer with deep expertise in networking, security, cloud architecture, and automation to support enterprise and federal customers across complex…
Added 16 mins ago
Space Flight Dynamics Engineer
The Aerospace Corporation
El Segundo, CA · Chantilly, VA · Colorado Springs, CO · Albuquerque, NM
Proficiency in one or more of the following programming languages and environments: C, C++, Fortran, Python, Linux, and/or MATLAB
Added 17 mins ago
Sr Leader, SDET
loanDepot
Irvine, CA · Plano, TX
Minimum five (5) + years of experience in a Lead SDET, Principal Engineer, Architect, Staff Engineer or comparable technical leadership role.
Added 20 mins ago
Senior Silicon Photonics Automated Test Production Engineer
OpenLight Photonics
Santa Clara, CA
…experience in designing custom test hardware and programming in python. The position is onsite at our Santa Clara CA office and our San Jose CA…
Added 27 mins ago
Senior IT Systems Engineer
10x Genomics
Pleasanton, CA
…productivity. We are looking for an exceptional Senior Systems Engineer with strong knowledge of Windows and virtualization platforms and extensive experience in building and maintaining…
Added 30 mins ago
Cloud Engineer
Worldlink
Remote - MST
Technical Leadership: Mentor and support engineering teams, guide data scientists and ML engineers on platform best practices, and lead resolution of complex platform issues.
Added 31 mins ago
GI
Technical Lead, Full-Stack Engineering – AI-Native Solutions
Guidehouse Inc.
VA
- $113,000 to $188,000 USD / year
Engineer for performance, reliability, scalability, and maintainability; lead code reviews for your workstream and validate behavior through automated tests and representative workloads.
Added 36 mins ago
R
Senior Security Engineer
Rain
Remote, United States
- $200,000 to $260,000 USD / year
- Lead external security assessments and drive findings to verified fixes
Added 44 mins ago
Modeling and Simulation Engineer, Junior
Booz Allen Hamilton_United States
Rome, NY
Modeling and Simulation Engineer, JuniorThe Opportunity:
Added 45 mins ago
Senior Software Engineer
Cryoport Systems, LLC
Remote, United States
As a Senior Software Engineer at Cryoport Systems, you will lead technical initiatives, optimize team delivery, and drive architectural decisions within one of our teams. You will…
Added 45 mins ago
Senior Software Engineer (Contingent)
Cryoport Systems, LLC
Remote, United States
As a Senior Software Engineer at Cryoport Systems, you will lead technical initiatives, optimize team delivery, and drive architectural decisions within one of our teams. You will…
Added 45 mins ago
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Forward Deployed Engineer - AI Solutions (Gracenote Division)
The Nielsen Company
Remote, United States
- $203,000 to $377,000 USD / year
We are seeking a highly technical, customer-focused Product Solutions Architect (PSA) to lead technical pre-sales and implementation for our suite of API and AI products, with a primary…
Added 47 mins ago
CM
Senior Applications Security Engineer, AI & Automation Development
Centene Management Company LLC
Remote, United States
- $87,000 to $161,300 USD / year
…capabilities used across Security Defense Technologies (SDT). This engineer will join the Defense Automation & Transformation team to expand our development and automation capacity, help…
Added 49 mins ago
Senior Test Infrastructure & Reliability Engineer, Photonics
PsiQuantum
Palo Alto, CA
…CEO, and co-founder Jeremy O'Brien, now Executive Chairman, lead a team and board that reflects how seriously the world is taking this build, joined this year by Intel's Lip-Bu Tan and…
Added 49 mins ago
Quantum Characterization, Verification, and Validation Engineer
PsiQuantum
Milpitas, CA
…CEO, and co-founder Jeremy O'Brien, now Executive Chairman, lead a team and board that reflects how seriously the world is taking this build, joined this year by Intel's Lip-Bu Tan and…
Added 49 mins ago
Manager, Passive Components
PsiQuantum
Palo Alto, CA
…CEO, and co-founder Jeremy O'Brien, now Executive Chairman, lead a team and board that reflects how seriously the world is taking this build, joined this year by Intel's Lip-Bu Tan and…
Added 54 mins ago
Senior Software Engineer, Backend (Consumer - Risk)
Coinbase
Remote, United States
As a Senior Software Engineer on the Risk Engineering team within the Consumer & Business group, you'll build and optimize the systems that detect and prevent fraud, manage credit and…
Added 1 hour ago
Software Engineering Director
CliftonLarsonAllen LLP
Indianapolis, IN · Raleigh, NC · Orlando, FL · Connection Center-Charlotte, NC · Tampa, FL · Atlanta, GA · Dallas, TX
Lead the technical architecture and implementation of client solutions involving custom software, cloud applications, APIs, enterprise integrations, automation, and AI-enabled capabilities.
Added 1 hour ago
PI
AI Agent Engineer, AI Transformation
Psomagen, Inc.
Rockville, MD
- $70,000 to $140,000 USD / year
We are looking for a hands-on developer with real AI agent experience to lead Psomagen's company-wide AI transformation. You will design, build and operate AI agents on top of the tools our…
Added 1 hour ago
Senior Solutions Engineer - US East
Hadrian
Remote, United States
Then look no further, and join us here at Hadrian as our new Senior Solutions Engineer!
Added 1 hour ago
Senior Product Engineer – Palantir / AI Lead (FDE)
International Motors, LLC
Lisle, IL
We have an exciting opportunity for a Senior Product Engineer - Palantir / AI Lead (FDE) Platform to help accelerate that transformation. Enabling Commercial Sales and Marketing, this role…
Added 1 hour ago
RA
Senior Test Automation Engineer
Rad AI
Remote, United States
- $150,000 to $185,000 USD / year
Our principle: Engineering owns quality; Quality owns the quality system. As a Senior Test Automation Engineer, you'll own test automation strategy for a product domain. You'll design…

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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