Note: The job is a remote job and is open to candidates in USA. Weekday AI is recruiting on behalf of an unnamed client for a Backend Security Engineer. The role focuses on backend engineering and application security, including creating coding tasks and deterministic verification mechanisms to assess AI systems’ software development and security capabilities.

Responsibilities

• Backend Engineering: Design, develop, modify, and debug backend services, APIs, and application components
• Security-Focused Task Development: Create challenging coding tasks involving secure software development, vulnerability fixes, authentication, authorization, and backend security controls
• Automated Verification: Implement deterministic verifiers and automated tests to validate code behavior, functional correctness, and adherence to task requirements
• Application Security: Identify and address security vulnerabilities using established practices, including OWASP guidelines and Common Weakness Enumeration (CWE) classifications
• Code Review and Analysis: Review software implementations for correctness, security risks, performance, maintainability, and adherence to engineering standards
• Debugging and Optimization: Investigate software defects, performance bottlenecks, and complex system failures in large-scale applications
• Code Refactoring: Improve existing codebases through refactoring, architectural enhancements, and implementation of complex backend features
• AI Evaluation: Develop high-quality engineering tasks that help evaluate and improve AI systems' software development, debugging, and security reasoning capabilities

Skills

• Strong backend development experience using Java, Node.js, Go, Rust, TypeScript, Python, C++, or similar programming languages
• Proven experience building scalable backend services, APIs, and production-grade applications
• Strong debugging, automated testing, performance optimization, and code review skills
• Solid understanding of software architecture, algorithms, data structures, and fundamental computer science concepts
• Ability to identify software defects, diagnose system bottlenecks, and implement reliable solutions
• Strong analytical thinking, problem-solving, and technical communication skills
• Ability to work independently and exercise sound engineering judgment when solving complex technical problems
• Prior experience working in AI is not required
• Professional experience in cybersecurity, application security (AppSec), or Security Operations (SecOps)
• Hands-on experience with penetration testing, vulnerability assessments, and security-focused code reviews
• Knowledge of secure coding practices, OWASP Top 10, CWE classifications, and common software vulnerabilities
• Experience identifying and remediating security flaws in backend services, APIs, and large-scale applications
• Familiarity with security testing, automated validation, and vulnerability remediation workflows
• Experience refactoring complex codebases and improving application reliability, scalability, and security

Benefits

• Remote
• Flexible schedule: you pick the hours and days (including weekends if desired)

Company Overview