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Backend Security Engineer
Weekday (YC W21)Core Competencies
Role fitCore Competencies
Use this summary to align your resume positioning with the role.
Demonstrates strong backend development capabilities with expertise in Java, Node.js, Go, and Python, alongside a solid understanding of software architecture and security practices. Proven ability to identify vulnerabilities, optimize performance, and implement scalable solutions in complex applications.
Highest-signal resume keywords
Backend Development ExperienceAutomated TestingSecurity Vulnerability AssessmentPerformance OptimizationCode Review Skills
Tech Stack
Tools & technologiesAbout the role
Key responsibilities & impact- Design, develop, modify, and debug backend services, APIs, and application components
- Create challenging coding tasks involving secure software development, vulnerability fixes, authentication, authorization, and backend security controls
- Implement deterministic verifiers and automated tests to validate code behavior, functional correctness, and task requirements
- Identify and address security vulnerabilities using OWASP guidelines and Common Weakness Enumeration (CWE) classifications
- Review software implementations for correctness, security risks, performance, maintainability, and engineering standards
- Investigate software defects, performance bottlenecks, and complex system failures in large-scale applications
- Improve existing codebases through refactoring, architectural enhancements, and complex backend feature implementation
- Develop engineering tasks to evaluate and improve AI systems' software development, debugging, and security reasoning capabilities
- Complete application screening, an approximately 30-minute AI interview, a technical assessment if required, and hiring manager review
- Submit the required minimum number of tasks each week and start first tasks within 24–48 hours after selection and onboarding
Requirements
What you’ll need- 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
- Professional experience in cybersecurity, application security (AppSec), or Security Operations (SecOps) preferred
- Hands-on experience with penetration testing, vulnerability assessments, and security-focused code reviews preferred
- Knowledge of secure coding practices, OWASP Top 10, CWE classifications, and common software vulnerabilities preferred
- Experience identifying and remediating security flaws in backend services, APIs, and large-scale applications preferred
- Familiarity with security testing, automated validation, and vulnerability remediation workflows preferred
- Experience refactoring complex codebases and improving application reliability, scalability, and security preferred
- Candidates must complete interviews and assessments independently, without outside assistance
- Candidates should be ready to begin immediately
- Selected engineers must submit a specified minimum number of tasks each week
Benefits
Comp & perks- Flexible schedule; choose hours and days, including weekends if desired
- Output-based compensation, with payment for each task meeting project specifications and quality standards
- Opportunity to contribute to next-generation AI systems
- Fast hiring process, often filled within 48 hours
- Ability to begin immediately; first tasks expected within 24–48 hours after selection and onboarding
ATS Keywords
✓ Tailor your resumeApplicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard Skills
JavaNode.jsGoPythonC++TypeScriptBackend Services DevelopmentAPIs DevelopmentDebuggingSoftware Architecture
Soft Skills
Analytical ThinkingProblem-SolvingTechnical CommunicationIndependent WorkSound Engineering Judgment
Tools & Technologies
OWASP GuidelinesCommon Weakness Enumeration (CWE)Penetration Testing ToolsVulnerability Assessment ToolsAutomated Validation Tools
Industry Keywords
CybersecurityApplication Security (AppSec)Security Operations (SecOps)Secure Coding PracticesVulnerability Remediation