Senior Software Engineer, Pentest Experience

Horizon3.ai

. Build and ship product capabilities spanning backend services, APIs, and modern web application stacks .

Posted 11/5/2026full-timeRemote • United StatesSenior💰 $200,000 - $235,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full-stack software engineering, with a strong focus on building and operating production software, backend services, and APIs. Capable of driving projects from requirements gathering to delivery while ensuring high-quality code and effective collaboration across teams.

Highest-signal resume keywords

Full Stack Software EngineeringBackend Services DevelopmentAWS, GCP, Azure ExperiencePython, Go, Rust, Java, TypeScript ProficiencyAPI Design and Implementation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Software EngineeringBackend DevelopmentFrontend DevelopmentSQL Database ManagementData ModelingObservability and Reliability PracticesPerformance TuningETL PipelinesGraphQLContainerization with Docker

Soft Skills

Strong Communication SkillsMentoring and CollaborationProblem-Solving

Tools & Technologies

DockerPostgreSQLNeo4jReactAngular

Industry Keywords

CybersecurityVulnerability ManagementExposure ManagementRisk AssessmentData-Intensive Products

Tech Stack

Tools & technologies

AngularAWSAzureCyber SecurityDockerETLGoogle Cloud PlatformGraphQLJavaJavaScriptNeo4jPostgresPythonReactRustSQLTypeScriptGo

About the role

Key responsibilities & impact

Build and ship product capabilities spanning backend services, APIs, and modern web application stacks
Own moderate-to-large projects end-to-end, including scoping, technical design, implementation, rollout, and iteration
Implement clear, maintainable, performant user-facing experiences aligned with product requirements and design direction
Partner with Product, Design, and adjacent engineering teams on cross-functional initiatives
Identify and resolve technical risks, blockers, and mis-scoped work
Explain technical decisions, tradeoffs, delivery risks, and implementation choices to technical and non-technical audiences
Contribute to architecture and design discussions focused on maintainability, operability, and long-term productivity
Write high-quality code, tests, and technical documentation
Provide code reviews that improve team output
Support and mentor less experienced engineers through feedback, onboarding, and collaboration
Improve engineering quality, team execution, and product experience through ownership and continuous improvement
Help build Horizon3.ai’s NodeZero platform for autonomous cybersecurity penetration testing and risk assessment

Requirements

What you’ll need

Bachelor’s degree in Computer Science, Computer Engineering, or a related field, or equivalent practical experience
6+ years of professional software engineering experience
Strong professional experience building and operating production software across the full stack
Ability to independently drive substantial work from requirements gathering through delivery
Experience building distributed backend services using Python, Go, Rust, Java, TypeScript, or similar
Experience building backend services on AWS, GCP, or Azure
Familiarity with Docker and containerized applications
Experience designing and operating APIs, services, and asynchronous or event-driven systems
Experience working with SQL-based relational databases in production
Experience with data modeling and persistence layers for product-grade backend systems
Experience with observability, reliability, and operational best practices for production services
Frontend development using modern JavaScript/TypeScript with React, Angular, or similar
Strong written and verbal communication skills
Preferred: PostgreSQL and performance tuning for large datasets
Preferred: graph databases such as Neo4j
Preferred: GraphQL backends
Preferred: ETL pipelines and data processing tools
Preferred: vulnerability management, exposure management, security telemetry, or related cybersecurity experience
Preferred: scoring or recommendation algorithms and data-intensive products
Preferred: partnering with product managers to define and sequence an MVP
Preferred: shaping technical direction across an organization

Benefits

Comp & perks

Stock options/equity package for all full-time roles
Career development opportunities
Collaborative and innovative work environment
Remote and hybrid work models depending on role and location
Health, vision, and dental insurance for employees and families
Flexible vacation policy
Generous parental leave
Inclusive culture and diversity, equity, and inclusion commitment
Up to 10% travel to team project kickoffs and annual company meetings