Jobs in the United States

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Added 14 mins ago
DE
Staff Engineer, Storage Metadata and Context
Disney Entertainment
Emeryville, CA
- $182,835 to $236,610 USD / year
Versatile Backend Development: High degree of comfort working across various programming languages to build the foundational "glue" that connects storage metrics and file data to agentic…
Added 24 mins ago
EA
Senior Full Stack Software Engineer
ExTrac AI
Remote, United States
- $165,000 to $180,000 USD / year
We are looking for a Senior Software Engineer based in the Washington DC area to work across ExTrac's backend services and the infrastructure they run on. This is a generalist role by…
Added 1 hour ago
Forward Deployed Engineer / Healthcare RCM Platform / Chicago Onsite
Kelly Services
Chicago, IL
A healthcare technology organization is seeking a full-time Lead Forward Deployed Engineer to help build and deploy AI-powered automation solutions across its Revenue Cycle Management…
Added 2 hours ago
Senior Software Engineer (Location Services)
CoreLogic Solutions, LLC
Austin, TX · Irvine, CA · San Diego, CA · Dallas, TX
Strong proficiency in one or more backend programming languages (e.g., Java, C++, Python, or Go).
Added 2 hours ago
P
Sr. Associate
Pfizer
New York City, NY
- $79,400 to $132,400 USD / year
Added 2 hours ago
Staff Backend Software Engineer (R50033532)
FOX
NEW YORK, NY
…thinking.JOB DESCRIPTIONABOUT THE ROLEWe are looking for a Staff Backend Software Engineer to lead delivery of reliable, scalable services for audio/video hosting, monetization, and…
Added 2 hours ago
Sr. Full Stack Dev/ Tech Lead (.Net/ Financial Domain)
CGI Technologies and Solutions, Inc.
Greenville, SC
Design and implement application features using JavaScript/TypeScript, React, Node.js, Python, .Net and related technologies on our AWS framework
Added 11 hours ago
Full Stack Engineer - Traffic Studies
Obvio
San Carlos, CA
- Own the traffic-study backend end to end: ingestion from multiple sensor types, vision-pipeline orchestration on our ML servers and cloud compute, event extraction, annotation hand-off,…
Added 11 hours ago
TT
Director of Engineering
True Talent Solutions Partners
Remote, United States
- $210,000 to $240,000 USD / year
- Experience with TypeScript or Python, AWS, and MongoDB; familiarity with React is relevant to the current stack.
Added 12 hours ago
Lead AI Software Engineer
Humana Inc.
Louisville, KY · Fort Lauderdale, FL · Nashville, TN · Tampa, FL · Dallas, TX
Strong backend development expertise with Python, Java, or similar languages.
Added 12 hours ago
PI
Staff Software Engineer, Backend Python
PayPal, Inc.
San Jose, CA · New York City, NY · Austin, TX
- $160,500 to $262,350 USD / year
Lead engineering efforts and team level processes by defining outcomes for others, refining ongoing processes, and providing technical advice to senior leaders on systems, solutions,…
Added 12 hours ago
SE
Platform Engineer (Kubernetes/Full Stack) (SAB-2611-07)
Sabre Engineering Inc
Columbia, MD
- $139,000 to $174,000 USD / year
Added 13 hours ago
Remote Lead Software Engineer for a Healthcare Company
Pearl
Remote, United States
…with the Head of Technology and the CEO, building across a Python/Django and PostgreSQL backend, a React frontend, and AWS infrastructure. Your first project is a donation management…
Added 14 hours ago
Senior Software Engineer, IT Digital Employee Experience
Databricks
San Francisco, CA
As a Senior Software Engineer on this team, you will own projects end-to-end and be the team lead of software engineers. You will own architecture, design, implementation, deployment, and…
Added 14 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 15 hours ago
A
Engineering Manager
Anterior
New York City, NY
- $250,000 to $300,000 USD / year
As an Engineering Manager, you'll lead a team of around 10 engineers in our New York office. You'll be responsible for the people on your team - how they're hired, how they grow, and how…
Added 15 hours ago
Forward Deployed Solution Engineer – Applied AI FDE
ServiceNow
Remote, United States
Engineering depth: Strength in backend (Python, Node.js, Java), frontend (React, Angular), APIs (REST/GraphQL)
Added 15 hours ago
ZZ
Senior Software Development Engineer
ZINC Zillow, Inc.
Remote, United States
- $156,200 to $262,600 USD / year
- Lead design and implementation of backend solutions that optimize performance, reliability, and observability for large-scale, distributed systems running in containerized and cloud…
Added 16 hours ago
Technology Operations Lead
Great Gray
Remote, United States
Great Gray is hiring a Technology Operations Lead to own operational discipline and delivery tracking across all of Engineering (RPAG, BoardingPass, Data Engineering, AI and DevOps). This…
Added 17 hours ago
Staff Engineer Software (Cortex Platform) - US Citizen
Palo Alto Networks, Inc.
CA
Lead the end-to-end backend development of features and core components through the entire lifecycle, from design and development to testing, deployment, and maintenance.
Added 17 hours ago
SDE III for Manufacturing Systems
Blue Origin Personnel, LLC
United States
…with engineers, program managers, and manufacturing teams, backend developer experience, and the ability to work in a fast-paced and evolving…
Added 17 hours ago
NI
Software Engineer, SME
Navstar Inc.
Chantilly, VA
- $190,000 to $240,000 USD / year
…new greenfield software development effort hosted within an AWS cloud environment. The selected candidate will lead application-level software development, working closely with Cloud…
Added 17 hours ago
Staff Software Engineer, Pentest Experience
Horizon3
Remote, United States
…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…
Added 17 hours ago
H
Principal Backend Engineer, Enterpise Platform
Horizon3
Remote, United States
- $255,000 to $295,000 USD / year
- Deep experience building and operating backend services in a modern language such as Python, Go, Java, or TypeScript.
Added 17 hours ago
H
Senior Full-Stack Engineer, Autonomous Defense
Horizon3
Remote, United States
- $195,000 to $235,000 USD / year
…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…

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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