Level path

Backend Foundations

Junior BE

Build reliable foundations and enough context to contribute safely with guidance.

Total concepts108

Curated for this specific career level.

Specific to this level23

Concepts explicitly listed in this level.

Knowledge tracks6

Concepts span multiple tracks and layers.

Job description signalsTypical responsibilities

Design and implement APIs, service logic, persistence boundaries, and core business workflows.
Improve backend performance, reliability, data correctness, security, and operability.
Own database access patterns, service integrations, and production debugging for backend systems.
Implement well-scoped tasks with guidance from more senior engineers.
Write readable code, tests, and documentation for small features or fixes.
Participate in code reviews, debugging sessions, and team ceremonies.
Learn the team codebase, delivery workflow, and production support expectations.

Cumulative view includes

Dev / Junior DevSE / Junior SE

Specific to this level 23Cumulative 108

Track / layer masteryConcept coverage by layer

UX

Product

11 concepts

API Products10 Web Applications1

{}

Software

9 concepts

Computer Networks3 Security3 System Design2 Software Design1

OPS

Operations

2 concepts

Runtime Infrastructure2

DATA

Data

1 concepts

Data Foundations1

{}

Software

66 concepts

Software Design16 Programming13 Algorithms & Data Structures12 Programming Languages7 Databases5 Computer Networks3 System Design3 Security3 Quality Assurance2 Operating Systems1 Software Architecture1

UX

Product

16 concepts

API Products10 Developer Tools4 Web Applications2

MGT

Management

11 concepts

Business Foundations10 Requirements & Planning1

OPS

Operations

9 concepts

Build & Packaging4 Runtime Infrastructure2 Local Development1 Continuous Integration1 Observability1

DATA

Data

3 concepts

Data Foundations3

Σ

Theory

3 concepts

Algorithmic Analysis3

Learning scopeConcepts by learning area

Specific to this level

Concepts introduced by this level

01

Level concepts

Web & APIs

Understand how clients and servers communicate through stable service interfaces.

ClientProduct · Web Applicationsawarenessnew ServerOperations · Runtime Infrastructureawarenessnew HTTPSoftware · Computer Networksnew HTTPSSoftware · Securitynew APIProduct · API Productsnew RESTProduct · API Productsnew CRUDProduct · API Productsnew API IdempotencyProduct · API Productsnew AuthenticationSoftware · Securitynew AuthorizationSoftware · Securitynew PaginationProduct · API Productsnew API VersioningProduct · API Productsnew Idempotency KeyProduct · API Productsnew HTTP MethodProduct · API Productsnew HTTP Status CodeProduct · API Productsnew EndpointProduct · API Productsnew URLSoftware · Computer Networksnew PATCH MethodSoftware · Computer Networksnew

02

Level concepts

Backend Design

Organize service code and boundaries so backend systems can evolve safely.

Dependency InjectionSoftware · Software Designnew

03

Level concepts

System Design

Design backend systems that handle scale, latency, state, and failure.

Load BalancerSoftware · System Designawarenessnew CacheSoftware · System Designawarenessnew

04

Level concepts

Production Backend

Understand how backend services are packaged, deployed, observed, and operated.

DockerOperations · Runtime Infrastructureawarenessnew ERDData · Data Foundationsnew

Cumulative level expectation

All concepts expected at this level

01

Inherited path

Coding Foundations

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

GPLSoftware · Programming Languagesworking Source CodeSoftware · Programming Languagesawareness FunctionSoftware · Programmingawareness Control FlowSoftware · Programming ArraySoftware · Algorithms & Data Structures Hash TableSoftware · Algorithms & Data Structures Synchronous ProgrammingSoftware · Programming Asynchronous ProgrammingSoftware · Programming VariableSoftware · Programming StateSoftware · Programming RecursionSoftware · Programming StackSoftware · Algorithms & Data Structures QueueSoftware · Algorithms & Data Structures Linked ListSoftware · Algorithms & Data Structures Binary SearchSoftware · Algorithms & Data Structures SortingSoftware · Algorithms & Data Structures Imperative ProgrammingSoftware · Programming Declarative ProgrammingSoftware · Programming Procedural ProgrammingSoftware · Programming Static TypingSoftware · Programming Languages Dynamic TypingSoftware · Programming Languages Type SystemSoftware · Programming Languages

02

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

03

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

04

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

05

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

06

Inherited path

Software Design

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

Object-Oriented ProgrammingSoftware · Programmingawareness InterfaceSoftware · Software Designawareness CompositionSoftware · Software Design CouplingSoftware · Software Design CohesionSoftware · Software Design Design PatternSoftware · Software Design RefactoringSoftware · Software Design SRPSoftware · Software Design OCPSoftware · Software Design LSPSoftware · Software Design ISPSoftware · Software Design DIPSoftware · Software Design Factory PatternSoftware · Software Design Adapter PatternSoftware · Software Design Strategy PatternSoftware · Software Design

07

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

08

Inherited path

Architecture & Systems

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

Clean ArchitectureSoftware · Software Architectureawareness Client-Server ArchitectureProduct · Web Applicationsawareness Functional RequirementSoftware · System Design

09

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

10

Path concepts

Web & APIs

Understand how clients and servers communicate through stable service interfaces.

ClientProduct · Web Applicationsawarenessnew ServerOperations · Runtime Infrastructureawarenessnew HTTPSoftware · Computer Networksnew HTTPSSoftware · Securitynew APIProduct · API Productsnew RESTProduct · API Productsnew CRUDProduct · API Productsnew API IdempotencyProduct · API Productsnew AuthenticationSoftware · Securitynew AuthorizationSoftware · Securitynew PaginationProduct · API Productsnew API VersioningProduct · API Productsnew Idempotency KeyProduct · API Productsnew HTTP MethodProduct · API Productsnew HTTP Status CodeProduct · API Productsnew EndpointProduct · API Productsnew URLSoftware · Computer Networksnew PATCH MethodSoftware · Computer Networksnew

11

Path concepts

Backend Design

Organize service code and boundaries so backend systems can evolve safely.

Dependency InjectionSoftware · Software Designnew

12

Path concepts

System Design

Design backend systems that handle scale, latency, state, and failure.

Load BalancerSoftware · System Designawarenessnew CacheSoftware · System Designawarenessnew

13

Path concepts

Production Backend

Understand how backend services are packaged, deployed, observed, and operated.

DockerOperations · Runtime Infrastructureawarenessnew ERDData · Data Foundationsnew