Applies algorithmic thinking to security analysis: pattern matching algorithms for vulnerability scanning, graph traversal for attack path analysis, hashing algorithms for integrity verification. Evaluates cryptographic algorithm strength and identifies algorithmic weaknesses in authentication systems.
Roles · Application Security Engineer · Senior
What a Senior } should know
39 core skills, 54 in total. Expectations per skill, and what changes at the next level.
This page lists what a Senior } is expected to know and do, skill by skill. Core skills are the ones a manager and peers assess in a review cycle; the rest count only in self-assessment. Main areas: Programming Fundamentals, API & Integration, Cloud & Infrastructure.
Core skills for a Senior
Grouped by area. The label on the right is the expected depth: Awareness, Working, Advanced or Expert.
Programming Fundamentals · 4
Designs secure code quality standards: SAST/DAST integration into CI pipelines, security-focused code review checklists, vulnerability pattern detection rules. Refactors authentication and authorization modules for defense-in-depth. Establishes secure coding guidelines aligned with OWASP standards.
Selects optimal data structures for security applications: bloom filters for threat intelligence lookup, trie structures for URL pattern matching, hash sets for rapid IOC detection. Optimizes data structures in SAST/DAST tools for minimal scan overhead. Designs efficient storage for vulnerability correlation and deduplication.
Applies OOP/SOLID in security tool architecture: strategy pattern for pluggable security scanners, template method for assessment workflows, clean abstractions for vulnerability data providers. Designs extensible security frameworks that allow new checks without modifying core scanning logic.
API & Integration · 4
Architects API security testing strategies across microservice ecosystems. Builds custom Burp Suite extensions and security testing frameworks for automated detection of OWASP API Top 10 vulnerabilities. Designs API gateway security policies and validates mTLS, token scoping, and rate limiting implementations. Mentors team on API threat modeling and secure API design review practices.
Designs rate limiting architecture for production APIs: multi-layer throttling (edge, gateway, service), cost-based rate limiting for expensive operations, and graceful degradation strategies. Implements real-time abuse detection with ML-based anomaly scoring.
Designs API security architecture: API gateway security patterns, OAuth2/OIDC integration for API authentication, rate limiting and abuse prevention at scale. Defines API security standards and conducts API threat modeling. Mentors team on secure API design principles.
Defines organization-wide webhook security standards covering endpoint hardening, secret management lifecycle, and threat modeling for event-driven architectures. Architects defense-in-depth strategies against SSRF through URL validation, DNS rebinding protection, and network segmentation. Leads incident response for webhook-related security breaches and designs automated abuse detection systems.
Cloud & Infrastructure · 4
Designs container security scanning architecture with multi-layer vulnerability detection: base image, application dependencies, and runtime behavior. Implements SBOM generation, policy-as-code enforcement, and automated remediation workflows for container supply chain.
Designs Docker infrastructure with security focus: container image vulnerability scanning pipelines, runtime security monitoring, Dockerfile hardening standards. Implements best practices for supply chain security, distroless base images, and container isolation for sensitive workloads.
Designs Kubernetes security architecture for multi-tenant production clusters. Implements comprehensive security hardening including admission controller policies, runtime threat detection with Falco, and workload identity federation. Optimizes security posture while maintaining developer productivity through policy-as-code frameworks.
Designs network security architecture for production application environments — VPC network segmentation, zero-trust micro-segmentation, and WAF rule engineering. Configures service mesh security policies with mTLS and authorization rules. Understands gRPC/HTTP2/HTTP3 security implications and designs DNS security strategies including DNSSEC. Optimizes network-level security controls for application performance.
DevOps & CI/CD · 1
Designs CI/CD security architecture: implements security scanning pipeline optimization for speed and coverage, designs progressive security gates across deployment stages, architects supply chain security controls in CI/CD. Mentors team on DevSecOps pipeline best practices.
Testing & QA · 1
Designs security testing strategy for applications: custom SAST/DAST pipeline architecture, threat model-driven test planning, and security chaos engineering. Implements advanced testing techniques: mutation-based fuzzing, semantic code analysis, and API specification-driven security testing. Creates security testing frameworks and reusable test libraries. Mentors team on security testing methodologies.
Security · 18
Designs security solutions with Cloud Infrastructure Security. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs organization-wide dependency scanning architecture integrating Snyk, Dependabot, and container image scanners like Trivy and Grype. Conducts threat modeling of the software supply chain, covering package registries, lock file integrity, and typosquatting risks. Implements SBOM generation (CycloneDX, SPDX) as part of the SDLC to meet regulatory compliance requirements. Mentors engineers on evaluating vulnerability exploitability using CVSS contextual scoring and reachability analysis.
Designs security solutions with Digital Forensics Basics. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs privacy-by-design architecture aligned with GDPR/152-FZ: data classification systems, automated PII discovery, and pseudonymization pipelines. Implements privacy threat modeling (LINDDUN) and conducts compliance audits of application stacks.
Designs security solutions with Incident Response Process. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs security solutions with JWT / OAuth2 / OIDC. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs security solutions with Kubernetes Security. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs security solutions with Network Security. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs enterprise application security programs aligned with OWASP frameworks — implements secure development lifecycle practices, threat modeling methodologies, and automated security pipeline integration. Conducts architectural-level threat modeling for complex systems. Mentors team on security architecture patterns and vulnerability root cause analysis.
Designs application security solutions ensuring full PCI DSS compliance. Conducts threat modeling for payment processing workflows. Integrates PCI-focused security checks into CI/CD pipelines and SDLC. Mentors developers on secure cardholder data handling.
Designs security solutions with RBAC / ABAC authorization. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs security solutions with SAST/DAST. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs application security architecture for secrets management: secure secret injection patterns, runtime credential protection, and secret-aware CI/CD pipelines. Implements secret detection in SAST/DAST tooling. Conducts threat modeling for secret exposure vectors across application stack. Mentors team on secure credential handling patterns and vault integration best practices.
Designs enterprise secure coding programs — implements security-by-design frameworks, creates organization-specific secure coding standards, and integrates automated security validation into CI/CD pipelines. Conducts architectural threat modeling and mentors development teams on writing defensive code against emerging attack vectors.
Designs security solutions with SOC2 Compliance. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs security solutions with Supply Chain Security. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
Designs threat modeling frameworks tailored to the organization's tech stack and risk profile. Integrates automated threat analysis into CI/CD pipelines (IaC scanning, dependency threat assessment). Mentors development teams on continuous threat modeling practices. Establishes threat libraries and reusable patterns for microservice architectures.
Designs security solutions with Vulnerability Management. Conducts threat modeling. Implements security practices in SDLC. Mentors the team.
AI-Assisted Development · 1
Designs GitHub Copilot security governance for development teams: implements security review processes for AI-generated code, configures Copilot content exclusion for sensitive repositories, evaluates AI-generated code for vulnerability introduction risks. Mentors team on secure AI-assisted development practices.
Observability & Monitoring · 3
Designs observability strategy with ELK Stack. Implements distributed tracing. Defines SLIs/SLOs. Conducts post-mortems.
Designs security observability strategy with Prometheus & Grafana: implements security metric collection for threat detection, defines SLIs/SLOs for security monitoring effectiveness, conducts post-mortems for security incidents with metric forensics. Mentors team on security-focused observability practices.
Designs security observability strategy: implements advanced security event correlation and threat detection pipelines, defines SLIs/SLOs for security monitoring effectiveness, conducts post-mortems for security incidents with forensic log analysis. Mentors team on security logging best practices and detection engineering.
Version Control & Collaboration · 2
Designs security code review processes: security-focused review standards for authentication/authorization code, vulnerability pattern detection checklists, secure coding review gates. Mentors team on identifying security issues during code review.
Designs Git security workflows for development teams: implements commit signing infrastructure and verification policies, configures advanced pre-commit hooks for SAST/secret scanning, designs branch protection strategies for compliance requirements. Mentors team on secure Git practices and incident response through version history.
Documentation · 1
Designs comprehensive runbook frameworks for application security operations: secure SDLC incident response, zero-day vulnerability handling, supply chain compromise playbooks. Mentors team members on writing effective, actionable security runbooks with proper escalation matrices.
Additional skills
Not assessed by the team, but part of the self-assessment and the development plan.
What changes at Lead
53 skills get a higher expectation or become core when moving from Senior to Lead. The biggest jumps first.
- Algorithms & Complexity: Advanced → Expert
- API Testing: Advanced → Expert
- Cloud Security: Advanced → Expert
- Code Quality & Refactoring: Advanced → Expert
- Code Review: Advanced → Expert
- Container Security Scanning: Advanced → Expert
- Data Structures: Advanced → Expert
- Dependency Vulnerability Scanning: Advanced → Expert
- Digital Forensics Basics: Advanced → Expert
- Docker: Advanced → Expert
} in the open competency matrix: 54 skills across 5 levels. The matrix is free for individuals and stays free.