Backend Engineer, Developer Tools & Automation

Who we are:

Horizon3’s mission is to enable organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. We are a fast-growing, remote cybersecurity company using automation and artificial intelligence to deliver Autonomous Penetration Testing as a Service (APTaaS). We are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results.

Summary/Overview

We are seeking a talented and detail-oriented Software Engineer for Developer Tools & Automation with a strong focus on testing and analysis. You will help ensure the reliability, scalability, and quality of our services by building and maintaining automated API controls and exercisers, Infrastructure Auto Deployments (IaC), Test Exercisers, log and results analysis, results tracking, and working closely with Engineering, DevOps, and Support teams in a fast-paced, agile environment.

Key responsibilities:

1. Create and maintain a log analysis tool ingesting data from multiple sources in multiple formats (AWS, S3, Azure, OS, networking, docker, kubernetes, etc.) with UI

2. Create, maintain and work with existing GQL API and database for maintenance and control operations

3. Create exerciser utilities to automate checking the functionality and performance of the products

4. Create and maintain IaC to auto-deploy target infrastructure for development and testing

5. Create and maintain program to track results of tests on targets with UI

6. Collaborate closely with developers, product managers, QA and support team members to define strategies and test cases and test interfaces.

7. Write clear and concise requirements, bug reports and track issues through resolution.

8. Integrate tests and exercisers into CI/CD pipelines to ensure fast feedback and code quality.

9. Perform manual testing as needed for exploratory, usability, and edge-case testing.

10. Participate in code reviews and architecture discussions related to development and testing.

Required Education/Experience:

• Bachelor’s degree in Computer Science, Engineering, or related field.

• 3–6+ years of experience in Development, Tool/Automation Engineering, SDET, or a similar backend-focused testing role.

• Proficient in Python and/or JavaScript/TypeScript

• Strong ability to analyze logs, use monitoring tools (e.g., CloudWatch, Datadog), and debug issues in a distributed environment.

• Strong experience with GQL APIs, Neo4j, Kubernetes and microservices.

• Solid experience with AWS services such as EC2, S3, Lambda, RDS, DynamoDB, CloudWatch, and IAM.

• Familiarity with Infrastructure as Code (IaC) tools like Terraform, AWS CloudFormation and VMware

• Experience with CI/CD pipeline, gitlab-ci

• Solid understanding of QA processes and methodologies

• Experience with Playwright

• Excellent communication and problem-solving skills.

Preferred Education/Experience:

• Experience with containerized environments using Docker and Kubernetes.

• Experience with cloud environments such as AWS and Azure

• Familiarity with event-driven architecture and asynchronous communication patterns.

• Familiarity with Agile workflows and practices

• AWS certifications (e.g., AWS Certified Developer or Solutions Architect) are a plus.

Citizenship/Clearance

US Citizen Required

Why H3

• 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.

• Growth Opportunities: Be part of a dynamic and growing team with numerous career advancement opportunities.

• Innovation-Driven Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.

• Flexible Work Environment: Enjoy the convenience and work-life balance that comes with remote work.

• Inclusive and Diverse Team: We value diversity and promote an inclusive culture where everyone can thrive.

Travel Required

We are a fully remote company, and this job may require up to 5% of travel to be successful. Job-related travel expenses are reviewed and must be approved by your manager.

Compensation Disclosure:

In accordance with various State’s transparency regulations, we provide the following salary range information for this position:

• Base salary range: $155,000 - $208,000 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.

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.

Join Horizon3.AI’s team of passionate professionals and contribute to the growth of cutting-edge cybersecurity solutions while building strong customer relationships in a dynamic and remote work environment.

Horizon3.ai is an equal opportunity employer and is committed to providing a work environment that is free from discrimination and harassment. We do not discriminate based on race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status.

We believe that diversity and inclusion are essential to our success as a company and as a community. We are committed to attracting, developing, and retaining a diverse workforce that represents the communities in which we operate. We strive to create an inclusive work environment where all employees feel valued, respected, and supported.

We encourage all qualified candidates to apply for open positions with our company and welcome candidates from all backgrounds and experiences.