Level path

Advanced Security

Senior SecEng

Design, evolve, and debug systems across boundaries with strong tradeoff awareness.

Total concepts280

Curated for this specific career level.

Specific to this level24

Concepts explicitly listed in this level.

Knowledge tracks6

Concepts span multiple tracks and layers.

Job description signalsTypical responsibilities

Identify, prevent, test, and respond to security risks across applications, infrastructure, identity, and data.
Run threat modeling, secure-code reviews, vulnerability assessment, incident response, and security automation.
Partner with engineering teams to make secure practices practical, repeatable, and measurable.
Lead the technical design and delivery of complex work across a team-owned system area.
Review architecture, mentor engineers, and raise engineering quality standards.
Anticipate scalability, security, operability, and migration risks before implementation.
Coordinate cross-functional work and make durable tradeoffs under ambiguity.

Cumulative view includes

Dev / Junior DevSE / Junior SESecEng / Junior SecEngDev / DevSE / Mid SESecEng / SecEngDev / Senior DevSE / Senior SE

Specific to this level 24Cumulative 280

Track / layer masteryConcept coverage by layer

{}

Software

12 concepts

Security12

OPS

Operations

11 concepts

Security Operations11

MGT

Management

1 concepts

Requirements & Planning1

{}

Software

206 concepts

Security51 Software Design34 Programming27 System Design22 Databases14 Programming Languages13 Algorithms & Data Structures12 Computer Networks9 Software Architecture9 Operating Systems5 Distributed Systems5 Quality Assurance4 Enterprise Architecture1

OPS

Operations

32 concepts

Security Operations11 Observability6 Build & Packaging5 Runtime Infrastructure4 Deployment2 Reliability2 Local Development1 Continuous Integration1

MGT

Management

20 concepts

Business Foundations10 Requirements & Planning7 Delivery Methodologies2 Team Leadership1

Product

17 concepts

API Products10 Developer Tools4 Web Applications3

Theory

3 concepts

Algorithmic Analysis3

DATA

Data

2 concepts

Data Foundations2

Learning scopeConcepts by learning area

Specific to this level

Concepts introduced by this level

Level concepts

Security Architecture

Set security direction across systems, platforms, and teams.

Public-Key CryptographySoftware · Securitynew Digital SignatureSoftware · Securitynew Certificate AuthoritySoftware · Securitynew Digital CertificateSoftware · Securitynew Key ExchangeSoftware · Securitynew Password HashingSoftware · Securitynew AESSoftware · Securitynew Symmetric EncryptionSoftware · Securitynew Asymmetric EncryptionSoftware · Securitynew Diffie-Hellman Key ExchangeSoftware · Securitynew PGP/GPGSoftware · Securitynew Data EncryptionSoftware · Securitynew

Level concepts

Security Operations

Connect engineering security to production detection and response.

Cumulative level expectation

All concepts expected at this level

Inherited path

Coding Foundations

Developers begin by learning to translate requirements into working, readable code.

Inherited path

Developer Tooling

Daily development depends on version control, language tooling, static checks, and repeatable local workflows.

GitProduct · Developer Toolsawareness CompilerSoftware · Programming Languagesawareness InterpreterSoftware · Programming Languages Package ManagerOperations · Build & Packaging LintingOperations · Build & Packaging Code EditorProduct · Developer Tools CLISoftware · Operating Systems Version ControlProduct · Developer Tools DependencyOperations · Build & Packaging ArtifactOperations · Build & Packaging Development EnvironmentOperations · Local Development Software EcosystemSoftware · Programming

Inherited path

Testing & Debugging

A developer owns not only writing code, but proving that it behaves as intended.

Unit TestSoftware · quality-assuranceawareness DebuggerProduct · Developer Toolsawareness Error HandlingSoftware · Programming Code DocumentationSoftware · Software Design

Inherited path

Employment Basics

Technical candidates benefit from understanding who employs them, how they are paid, and which terms govern the working relationship.

EmployeeManagement · business-foundationsawareness ContractorManagement · business-foundationsawareness EORManagement · business-foundations Offer LetterManagement · business-foundations Employment ContractManagement · business-foundations CompensationManagement · business-foundations Employee BenefitsManagement · business-foundations Equity CompensationManagement · business-foundations PayrollManagement · business-foundations Statement of WorkManagement · business-foundations

Inherited path

Programming Foundations

Learn the basic building blocks used to express behavior in code.

Graph Data StructureSoftware · Algorithms & Data Structuresawareness Big O NotationTheory · Algorithmic Analysisawareness Requirements EngineeringManagement · Requirements & Planning Time ComplexityTheory · Algorithmic Analysis Space ComplexityTheory · Algorithmic Analysis TreeSoftware · Algorithms & Data Structures HeapSoftware · Algorithms & Data Structures Breadth-First SearchSoftware · Algorithms & Data Structures Depth-First SearchSoftware · Algorithms & Data Structures ConcurrencySoftware · Programmingworking

Inherited path

Software Design

Structure code so it remains readable, testable, and maintainable as it grows.

Inherited path

Data & Persistence

Understand how applications store, retrieve, and protect durable state.

Relational DatabaseSoftware · Databasesawareness SQLSoftware · Databasesawareness Database IndexSoftware · Databases TransactionSoftware · Databases ACIDSoftware · Databases QueryData · Data Foundations Data ModelData · Data Foundations B-TreeSoftware · Databasesworking Database NormalizationSoftware · Databasesworking NoSQLSoftware · Databases LSM-TreeSoftware · Databasesadvanced MVCCSoftware · Databasesadvanced Database ShardingSoftware · System Design

Inherited path

Architecture & Systems

Design systems that handle growth, latency, failure, and multiple communicating components.

Inherited path

Production Awareness

Know how software is built, deployed, observed, and recovered in production.

CI/CD PipelineOperations · Continuous Integrationawareness Integration TestSoftware · quality-assuranceawareness System ObservabilityOperations · Observability MonitoringOperations · Observabilityworking Input ValidationSoftware · Securityworking Circuit BreakerSoftware · System Design TracingOperations · Observability DockerOperations · Runtime Infrastructureadvanced ContainerOperations · Runtime Infrastructureadvanced MetricsOperations · Observability AlertingOperations · Observability Security EngineeringSoftware · Security Threat ModelingSoftware · Security Incident ResponseOperations · Reliability SLOOperations · Reliability Technical DebtManagement · Requirements & Planning Trade-offManagement · Requirements & Planning

Inherited path

Security Foundations

Learn the core vocabulary of vulnerabilities, identity, and defensive thinking.

FirewallSoftware · Security CryptographySoftware · Security EncryptionSoftware · Security Access ControlSoftware · Security SSHSoftware · Security MFASoftware · Security CAPTCHASoftware · Security VPNSoftware · Security Secure CodingSoftware · Security Least PrivilegeSoftware · Security Cryptographic HashSoftware · Security Hash FunctionSoftware · Security RSASoftware · Security IAMSoftware · Security

Inherited path

Web Security Basics

Understand common application attacks and how they appear in web systems.

Cross-Site ScriptingSoftware · Security Cross-Site Request ForgerySoftware · Security SQL InjectionSoftware · Security OWASP Top 10Software · Security TLSSoftware · Security PhishingSoftware · Security

Inherited path

Application Design

Mid-level developers own complete features and make local design choices inside an established architecture.

AbstractionSoftware · Software Design EncapsulationSoftware · Software Design InheritanceSoftware · Software Design PolymorphismSoftware · Software Design ClosureSoftware · Programming ImmutabilitySoftware · Programming Side EffectSoftware · Programming Higher-Order FunctionSoftware · Programming Generic ProgrammingSoftware · Programming Inversion of ControlSoftware · Software Design YAGNISoftware · Software Design Code ComplexitySoftware · Software Design Cyclomatic ComplexitySoftware · Software Design Cognitive ComplexitySoftware · Software Design

Inherited path

Runtime & Data

Feature ownership requires practical knowledge of runtimes, memory management, and relational persistence.

RuntimeSoftware · Programming Languagesworking Garbage CollectionSoftware · Programming Languagesworking Call StackSoftware · Programming Heap MemorySoftware · Programming Event LoopSoftware · Programming SerializationSoftware · Programming JoinSoftware · Databases Write-Ahead LogSoftware · Databases Abstract Syntax TreeSoftware · Programming Languages LexerSoftware · Programming Languages ParserSoftware · Programming Languages BytecodeSoftware · Programming Languages

Inherited path

Delivery & Collaboration

Professional development includes the complete implementation loop, not only editing source files.

Code ReviewManagement · Team Leadershipworking Contract TestingSoftware · quality-assuranceworking Software DeploymentOperations · Deployment LoggingOperations · Observability MockSoftware · Software Design Semantic VersioningOperations · Build & Packaging PRDManagement · Requirements & Planning TSDSoftware · Software Design Product BacklogManagement · Requirements & Planning Backlog RefinementManagement · Requirements & Planning SprintManagement · Delivery Methodologies

Inherited path

Secure Design

Apply security practices during design, implementation, and review.

Secrets ManagementSoftware · Security JWTProduct · Web Applications OAuthProduct · Web Applications HMACSoftware · Security Tamper ResistanceSoftware · Security Certificate ManagementSoftware · Security Zero TrustSoftware · Security

Inherited path

Security Testing

Find, validate, and prioritize security weaknesses.

Security TestingSoftware · Security Vulnerability AssessmentSoftware · Security Penetration TestingSoftware · Security Man-in-the-Middle AttackSoftware · Security HackerSoftware · Security MalwareSoftware · Security TrojanSoftware · Security VirusSoftware · Security

Inherited path

Advanced Implementation

Senior developers handle complex application behavior and establish strong coding patterns for others.

ProfilingSoftware · Programming SDDSoftware · Software Architecture Concurrent ProgrammingSoftware · Programming ParallelismSoftware · Programming SynchronizationSoftware · Programming Race ConditionSoftware · Operating Systems MutexSoftware · Operating Systems SemaphoreSoftware · Operating Systems Thread PoolSoftware · Operating Systems Maintainability IndexSoftware · Software Design Halstead MetricsSoftware · Software Design

Inherited path

Service Development

Senior developers often own APIs and service modules while collaborating with engineers on broader architecture.

API VersioningProduct · API Products Schema EvolutionSoftware · Databases Request-ResponseProduct · API Products RPCProduct · API Products SOAPProduct · API Products XMLProduct · API Products MiddlewareSoftware · Software Architecture Application ServerOperations · Runtime Infrastructure Web ServerOperations · Runtime Infrastructure

Inherited path

Production Code

Senior developers understand how implementation choices affect deployment, diagnostics, and recovery.

SDLCManagement · Delivery Methodologiesadvanced Feature FlagSoftware · quality-assurance Blue-Green DeploymentOperations · Deployment

Path concepts

Security Architecture

Set security direction across systems, platforms, and teams.

Path concepts

Security Operations

Connect engineering security to production detection and response.