Software Engineer
ParameterAbout the role
Company Description Parameter (YC W26) builds autonomous AI penetration testing solutions that continuously probe applications and infrastructure like an offensive security engineer. Its agents identify issues such as IDORs, broken access control, XSS, and cloud misconfigurations that traditional scanners often overlook. The company focuses on strengthening modern software systems against real-world security threats through automation and intelligent tooling. Formerly known as Hex Security, Parameter is backed by Y Combinator, Nexus Ventures, and Inovia Capital, offering a fast-paced, high-impact environment for engineers interested in security and AI.
Role Description As a Software Engineer at Parameter, you will design, build, and maintain backend services that power autonomous AI pentesting agents. You will write production-quality code, implement APIs, integrate with cloud infrastructure, and optimize system performance and reliability. You will collaborate with security specialists, product managers, and other engineers to translate offensive security workflows into scalable software features and tools. This is a full-time, on-site role based in San Francisco, CA, where you will participate in code reviews, contribute to architectural decisions, and help improve engineering practices and automation across the stack.
Qualifications
Strong foundation in Computer Science, including algorithms, data structures, and systems concepts.
Hands-on experience in Software Development and Programming in one or more modern languages (e.g., Python, Go, Rust, Java, or similar).
Proficiency in Back-End Web Development, including RESTful APIs, microservices, and working with databases.
Solid understanding and practical use of Object-Oriented Programming (OOP) principles in production systems.
Familiarity with security concepts, penetration testing workflows, or interest in offensive security and AI-driven tooling.
Experience with cloud platforms (e.g., AWS, GCP, Azure) and infrastructure-as-code or containerization is beneficial.
Ability to write clean, testable code, perform code reviews, and collaborate in a fast-moving, high-ownership environment.
Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
Responsibilities
- Design, build, and maintain backend services for AI pentesting agents
- Write production-quality code and implement APIs
- Integrate with cloud infrastructure and optimize system performance
- Collaborate with security specialists and product managers
- Participate in code reviews and contribute to architectural decisions
Qualifications
- Strong foundation in Computer Science, including algorithms and data structures
- Hands-on experience in Software Development in modern languages like Python or Java
- Proficiency in Back-End Web Development and RESTful APIs
- Solid understanding of Object-Oriented Programming principles
- Familiarity with security concepts and penetration testing workflows
- Experience with cloud platforms and infrastructure-as-code is beneficial
- Ability to write clean, testable code and collaborate in a fast-moving environment
- Bachelor’s degree in Computer Science or related field, or equivalent experience
Skills mentioned
About Parameter
Parameter (YC W26) is autonomous AI pentesting. Our agents continuously test your applications and infrastructure the way an offensive security engineer would, finding IDORs, broken access control, XSS, and cloud misconfigurations that scanners miss. Formerly Hex Security. Backed by YCombinator, Nexus Ventures, and Inovia Capital.