Learning path
Application Security Engineer learning path: everything to study, topic by topic
Assesses the ability to integrate security into software development — secure code review, threat modeling, SAST/DAST, and security architecture for applications.
Short answer
To learn Application Security Engineer, work through 6 modules and 24 topics in the order they build on each other. It starts with Secure Development, then moves on to Code Security Analysis and Threat Modeling. Use the map as a checklist, or measure your level and study only what is missing.
What you will study
Topics are grouped by module. Open one to see its objectives and key concepts.
1 · Secure Development4 topics
OWASP Top 10 (Web & API)
Understanding and mitigating the OWASP Top 10 vulnerabilities for web applications and APIs, including injection, broken authentication, XSS, SSRF, and insecure deserialization
Objectives
- Identify and classify OWASP Top 10 vulnerabilities in a web application
- Recommend mitigation strategies for each category of OWASP Top 10 risks
Key concepts
- injection attacks
- broken access control
- cryptographic failures
- insecure design
- security misconfiguration
- vulnerable components
- SSRF
- XSS
Secure Coding Principles
Applying secure coding practices including least privilege, defense in depth, fail-safe defaults, and secure error handling across programming languages
Objectives
- Apply secure coding principles to prevent common vulnerability classes
- Design error handling that does not leak sensitive information
Key concepts
- least privilege
- defense in depth
- fail-safe defaults
- secure error handling
- separation of concerns
- input distrust
Input Validation & Output Encoding
Implementing robust input validation, output encoding, parameterized queries, and content security policies to prevent injection and XSS attacks
Objectives
- Implement input validation that prevents SQL injection and XSS in a web application
- Design a content security policy that balances functionality and security
Key concepts
- allowlist validation
- output encoding
- parameterized queries
- content security policy
- HTML entity encoding
- context-aware escaping
Authentication & Session Management Security
Securing authentication flows, session tokens, password storage, multi-factor authentication, and preventing session hijacking and fixation attacks
Objectives
- Design a secure authentication flow that resists common attacks
- Implement session management that prevents fixation and hijacking
Key concepts
- password hashing
- session token security
- MFA implementation
- session fixation
- session hijacking
- OAuth 2.0 security
- JWT security
2 · Code Security Analysis4 topics
Static Analysis (SAST) Tools
Using static application security testing tools to identify vulnerabilities in source code, configuring rulesets, triaging findings, and integrating SAST into CI/CD pipelines
Objectives
- Configure a SAST tool pipeline that minimizes false positives while catching critical issues
- Triage SAST findings and prioritize remediation based on risk
Key concepts
- SAST tools
- false positive triage
- custom rule creation
- CI/CD integration
- code pattern detection
- taint analysis
Dynamic Analysis (DAST) Tools
Running dynamic application security testing against live or staging applications, configuring scan profiles, interpreting results, and automating DAST in deployment pipelines
Objectives
- Set up a DAST scan that covers authenticated application paths without disrupting the environment
- Interpret DAST results and distinguish true positives from scan artifacts
Key concepts
- DAST scanners
- scan profiles
- authenticated scanning
- crawl configuration
- runtime vulnerability detection
- API scanning
Secure Code Review Practices
Conducting manual and tool-assisted secure code reviews, identifying security anti-patterns, and providing actionable remediation guidance to development teams
Objectives
- Conduct a security-focused code review that identifies critical vulnerabilities
- Provide clear, actionable remediation guidance that developers can implement immediately
Key concepts
- code review checklists
- security anti-patterns
- remediation guidance
- review automation
- risk-based review prioritization
- developer coaching
Dependency Vulnerability Management (SCA)
Managing third-party dependency risks using software composition analysis, tracking CVEs, enforcing license compliance, and implementing automated dependency updates
Objectives
- Implement an SCA pipeline that detects and alerts on critical dependency vulnerabilities
- Create a dependency management policy that balances security and development velocity
Key concepts
- SCA tools
- CVE tracking
- SBOM generation
- license compliance
- transitive dependencies
- automated patching
3 · Threat Modeling4 topics
STRIDE / PASTA Frameworks
Applying STRIDE and PASTA threat modeling methodologies to identify threats, categorize attack vectors, and systematically enumerate risks for software systems
Objectives
- Apply the STRIDE framework to identify threats in a new application design
- Walk through the PASTA methodology stages for a business-critical application
Key concepts
- STRIDE categories
- PASTA stages
- threat enumeration
- attack tree construction
- threat library
- countermeasure mapping
Attack Surface Analysis
Systematically mapping and reducing the attack surface of applications, including entry points, data flows, trust boundaries, and exposed interfaces
Objectives
- Map the complete attack surface of a multi-tier web application
- Recommend specific measures to reduce the attack surface without losing functionality
Key concepts
- entry point enumeration
- trust boundaries
- data flow mapping
- exposed interfaces
- attack surface reduction
- external dependencies
Data Flow Diagrams for Security
Creating security-focused data flow diagrams that map trust boundaries, data classification, encryption points, and authentication checkpoints across system components
Objectives
- Create a multi-level DFD that clearly shows trust boundaries and data classification
- Use a security DFD to identify gaps in encryption and authentication controls
Key concepts
- DFD levels
- trust boundary notation
- data classification labels
- encryption at rest and transit
- authentication checkpoints
- security zone mapping
Risk Scoring & Prioritization
Using CVSS, DREAD, and custom risk scoring models to prioritize vulnerabilities and threat remediation based on business impact, exploitability, and exposure
Objectives
- Calculate CVSS scores and use them to prioritize remediation across a vulnerability backlog
- Define risk acceptance criteria that balance security posture with business constraints
Key concepts
- CVSS scoring
- DREAD model
- business impact analysis
- exploitability assessment
- risk acceptance criteria
- risk register management
4 · API & Cloud App Security4 topics
API Security (Rate Limiting, AuthZ)
Securing APIs with rate limiting, authorization enforcement, input schema validation, API gateway security, and preventing BOLA, BFLA, and mass assignment vulnerabilities
Objectives
- Design an API security strategy that prevents the OWASP API Security Top 10 vulnerabilities
- Implement rate limiting and authorization controls for a public-facing API
Key concepts
- rate limiting
- API authorization
- BOLA prevention
- BFLA prevention
- mass assignment
- API gateway security
- schema validation
Container Application Security
Securing containerized applications including image scanning, runtime protection, least-privilege container configurations, and Kubernetes security policies
Objectives
- Design a container security pipeline from build to runtime
- Configure Kubernetes security policies that enforce least privilege
Key concepts
- container image scanning
- runtime security
- least-privilege containers
- Kubernetes pod security
- network policies
- secrets management in containers
Serverless Security Patterns
Securing serverless applications including function permissions, event injection prevention, cold start security, and monitoring serverless workloads for threats
Objectives
- Design IAM policies for serverless functions following least privilege principles
- Identify and mitigate event injection vulnerabilities in serverless architectures
Key concepts
- function IAM permissions
- event injection
- cold start security
- serverless monitoring
- least-privilege functions
- API Gateway auth patterns
Microservices Security (mTLS, Service Mesh)
Implementing security in microservices architectures using mTLS, service mesh, distributed authentication, and zero-trust networking between services
Objectives
- Design a service mesh security architecture that enforces mTLS and authorization policies
- Implement zero-trust networking between microservices in a Kubernetes cluster
Key concepts
- mTLS
- service mesh security
- distributed auth
- zero-trust networking
- sidecar proxies
- service-to-service AuthZ
5 · Security Testing4 topics
Penetration Testing Basics
Planning and executing basic penetration tests, understanding recon techniques, exploitation frameworks, and documenting findings with clear remediation recommendations
Objectives
- Plan a penetration test engagement with clear scope and rules of engagement
- Document penetration test findings with business-impact-focused remediation guidance
Key concepts
- recon techniques
- exploitation frameworks
- vulnerability chaining
- report writing
- rules of engagement
- remediation recommendations
Fuzzing & Edge Case Testing
Using fuzz testing to discover unexpected vulnerabilities, configuring fuzzers for different input types, and integrating fuzzing into continuous security testing
Objectives
- Design a fuzzing strategy for a REST API that maximizes code coverage
- Triage fuzzer crash reports and identify exploitable conditions
Key concepts
- mutation-based fuzzing
- generation-based fuzzing
- coverage-guided fuzzing
- crash triage
- corpus management
- continuous fuzzing
Mobile Application Security
Assessing mobile application security including data storage, transport security, certificate pinning, binary protections, and platform-specific security controls
Objectives
- Assess a mobile application against the OWASP Mobile Top 10 checklist
- Recommend security controls for mobile data storage and network communication
Key concepts
- OWASP Mobile Top 10
- certificate pinning
- secure data storage
- binary protections
- transport layer security
- platform security controls
AI/LLM Application Security (Prompt Injection)
Securing AI and LLM-powered applications against prompt injection, data poisoning, model theft, and ensuring safe output handling and content filtering
Objectives
- Identify and mitigate prompt injection vulnerabilities in an LLM-powered application
- Design guardrails and output filtering for a customer-facing AI chatbot
Key concepts
- prompt injection
- indirect prompt injection
- data poisoning
- model theft
- output filtering
- guardrails
- OWASP LLM Top 10
6 · Security Program4 topics
Security Champions Program
Building and managing a security champions program that embeds security advocates within development teams to scale application security practices across the organization
Objectives
- Design a security champions program for a 500-person engineering organization
- Create training and incentive structures that sustain champion engagement long-term
Key concepts
- champion selection criteria
- training curriculum
- incentive structures
- knowledge sharing
- security culture
- program metrics
Vulnerability Disclosure Program
Designing and operating vulnerability disclosure and bug bounty programs, managing researcher relationships, triaging reports, and coordinating responsible disclosure
Objectives
- Design a vulnerability disclosure policy that balances researcher incentives with business risk
- Create a triage workflow for incoming vulnerability reports with clear SLAs
Key concepts
- responsible disclosure
- bug bounty platforms
- researcher engagement
- triage SLAs
- legal safe harbor
- disclosure coordination
Security Metrics & KPIs
Defining and tracking application security metrics such as mean time to remediate, vulnerability density, fix rate, and security debt to measure and improve the AppSec program
Objectives
- Define a balanced scorecard of AppSec metrics that drives behavior change in engineering teams
- Present security metrics to executive leadership in terms of business risk reduction
Key concepts
- MTTR
- vulnerability density
- fix rate
- security debt
- risk trending
- executive dashboards
Security Architecture Review Board
Establishing and running a security architecture review board that evaluates new designs, major changes, and acquisitions for security risk before deployment
Objectives
- Define a security architecture review process that scales without becoming a bottleneck
- Establish risk acceptance criteria and exception management for the review board
Key concepts
- review board charter
- design review criteria
- risk acceptance authority
- exception management
- review cadence
- architecture standards
Levels: Junior, Mid, Senior, and Expert
Explain it in your own words
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Frequently asked questions
Where should I start studying Application Security Engineer?
Start with Secure Development: OWASP Top 10 (Web & API), Secure Coding Principles, and Input Validation & Output Encoding. The map orders topics by what they depend on, so each one prepares the next.
How long does a full Application Security Engineer assessment take?
A full assessment of this path takes about 50 minutes. Study time depends on where you start; a diagnostic shows which topics you can skip.
Do I need an account to use this page?
No. The map, objectives and key concepts are open. You only need an account to be measured, get your gap by topic and receive a plan.