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Added 43 mins ago
Electronic Engineer - SW Infrastructure
Northrop Grumman
San Diego
Experience in hands-on SW development with Python, Java, C++, and/or MATLAB to enable the exploitation of large sets of data.
Added 56 mins ago
Jr.-Level Full-Stack AI Engineer
CGI Technologies and Solutions, Inc.
Knoxville, TN
CGI is seeking a motivated and innovative Junior Full-Stack AI Engineer to join our growing AI engineering team. In this role, you will design, develop, and deploy scalable AI-powered…
Added 56 mins ago
Mid-Level Full-Stack AI Engineer
CGI Technologies and Solutions, Inc.
Knoxville, TN
CGI is seeking an experienced and innovative Mid-Level Full-Stack AI Engineer to join our growing AI engineering team. In this role, you will lead the design, development, and deployment of…
Added 1 hour ago
Senior Site Reliability Engineer, AI Platforms
Focused
Chicago, IL · Denver, CO
We're looking for a Senior Site Reliability Engineer to embed with a fast-growing AI developer platform company. You'll help their customers run the platform on their own infrastructure:…
Added 1 hour ago
Senior Site Reliability Engineer, AI Platforms
Focused
Denver, CO · Chicago, IL
We're looking for a Senior Site Reliability Engineer to embed with a fast-growing AI developer platform company. You'll help their customers run the platform on their own infrastructure:…
Added 1 hour ago
Consulting Architect
Elastic
United States
Acting as a trusted technical advisor, you will work with enterprises to improve application performance, infrastructure visibility, and end-user experience, while also improving their…
Added 1 hour ago
Senior Principal Software Application Security
The Huntington National Bank
Remote, United States
Data & Analytics: Engineer pipelines and analytics solutions for processing logs, telemetry, and security data to generate actionable insights.
Added 1 hour ago
Senior Machine Learning Engineer, Relevance
Airbnb
United States
Experience with 3 or more of these technologies: Tensorflow, PyTorch, Kubernetes, Spark, Airflow (or equivalent), Kafka (or equivalent), data warehouse (eg. Hive)
Added 2 hours ago
Senior Machine Learning Engineer, Ads
Unity Technologies SF
Mountain View, CA · San Francisco, CA
We're seeking a Machine Learning Engineer to own the ML side of Offerwall fraud prevention. You'll take our real-time anomaly detection and device risk models from development into…
Added 2 hours ago
W
Software engineer, generative AI
WRITER
San Francisco, CA · Seattle, WA · New York City, NY
- $146,000 to $240,000 USD / year
- 3-5+ years of hands-on experience as a software engineer with a strong emphasis on Python development in production environments
Added 2 hours ago
W
Software engineer, connectors & MCP
WRITER
San Francisco, CA · Seattle, WA · New York City, NY
- $146,000 to $240,000 USD / year
- Solid backend fundamentals in modern server frameworks and data systems (e.g., TypeScript/Node or Python ecosystems, PostgreSQL), with ability to choose the right tool for the system;…
Added 2 hours ago
W
Software engineer, agents
WRITER
New York City, NY · Seattle, WA · San Francisco, CA
- $146,000 to $240,000 USD / year
We’re seeking a highly skilled fullstack software engineer to join our engineering team building advanced AI-driven agent systems that execute autonomous workflows, orchestrate multi-step…
Added 2 hours ago
PA
Expert: Interactive Coding, Site Reliability Engineering (Contract, Remote)
Patronus AI, Inc.
Remote, United States
- $150 USD / hour
Platform and infrastructure. Engineers who own clusters, deploy pipelines and infrastructure as code: Kubernetes, Helm, Terraform, CI/CD, networking and capacity. Typical titles:…
Added 2 hours ago
TT
Senior Platform Engineer
True Talent Solutions Partners
New York, NY
- $175,000 to $220,000 USD / year
- Hands-on experience with AWS production workloads, distributed systems, and large-scale data storage and retrieval.
Added 2 hours 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 2 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 2 hours ago
S
AI Engineer (Superhuman Mail) - Latin America
Superhuman
San Francisco, CA
- $128,000 to $210,000 CAD / year
- 4-6+ years of software engineering experience with a strong backend foundation (Python or TypeScript is great, Go is a plus)
Added 2 hours ago
S
AI Engineer (Superhuman Mail) - Canada
Superhuman
San Francisco, CA
- $128,000 to $210,000 CAD / year
- 4-6+ years of software engineering experience with a strong backend foundation (Python or TypeScript is great, Go is a plus)
Added 2 hours ago
S
AI Engineer (Superhuman Mail) - US
Superhuman
Remote, United States
- $154,000 to $257,000 USD / year
- 4-6+ years of software engineering experience with a strong backend foundation (Python or TypeScript is great, Go is a plus)
Added 3 hours ago
ETL Engineer / Data Scientist (TS/SCI)
Vantor Services Inc.
Herndon, VA
Vantor is seeking an ETL Engineer / Data Scientist to develop and maintain data pipelines that support mission applications, analytics, and data science workflows. The successful candidate…
Added 3 hours ago
Senior Engineer, Kubernetes Infrastructure
CoreWeave
CA / Bellevue, WA · Livingston, NJ · Manhattan, NY · Sunnyvale, CA
CoreWeave is The Essential Cloud for AI™. Built for pioneers by pioneers, CoreWeave delivers a platform of technology, tools, and teams that enables innovators to build and scale AI with…
Added 3 hours ago
Staff Offensive Security Engineer
INSPYR Solutions
Beverly Hills, CA
Deep expertise attacking cloud infrastructure and identity, such as AWS and Kubernetes, and experience with Windows, Active Directory, and Linux environments.
Added 3 hours ago
AI Solutions Engineer
UWMSN University of Wisconsin Madison
Remote, United States
…Information Technology is seeking a highly skilled AI Solutions Engineer to design, build, operate, and continuously improve the cloud and hybrid platforms that support AI-enabled services.…
Added 3 hours ago
ZZ
Senior Software Development Engineer
ZINC Zillow, Inc.
Remote, United States
- $156,200 to $262,600 USD / year
- Hands-on experience with cloud platforms (such as AWS, GCP, or Azure) and containerization/orchestration technologies (such as Docker and Kubernetes) for deploying and operating services…
Added 3 hours ago
Member of Deployment Staff - Public Sector
Reflection
New York City, NY · San Francisco, CA
- Strong technical fluency: comfortable reading, writing and reasoning about code, architecture and system behavior, with strong Python and experience shipping production-grade systems.

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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