Backend Engineering

Backend Developer (PHP)

Developing web applications and APIs in PHP using modern frameworks

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63 skills

310 requirements

126 mandatory

12 domains

Awareness 63 Working 99 Advanced 119 Expert 29

Level:

Profiles: Awareness Working Advanced Expert -- Click level to expand, click requirement for details and voting

Programming Fundamentals

8 skills · 40 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Algorithms & Data Structures
Algorithms & Complexity	Awareness	Working	Advanced	Advanced	Expert
Data Structures	Awareness	Working	Advanced	Advanced	Expert
OOP & Design Patterns
OOP & SOLID Principles	Awareness	Working	Advanced	Advanced	Expert
Design Patterns	Awareness	Working	Advanced	Advanced	Expert
Concurrency & Parallelism
Multithreading	Awareness	Working	Working	Advanced	Advanced
Async Programming	Awareness	Working	Advanced	Advanced	Expert
Clean Code & Refactoring
Code Quality & Refactoring	Awareness	Working	Advanced	Advanced	Expert
Type Systems
Type Safety & Type Systems	Awareness	Working	Advanced	Advanced	Expert

8 skills · 39 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Web Frameworks
PHP Frameworks	Awareness	Working	Advanced	Advanced	Expert
Message Queues & Event Streaming
Apache Kafka	Awareness	Working	Advanced	Advanced	—
RabbitMQ	Awareness	Working	Advanced	Advanced	Expert
Message Broker Patterns	Awareness	Working	Working	Advanced	Expert
Caching
Redis	Awareness	Working	Advanced	Advanced	Expert
Caching Strategies	Awareness	Working	Advanced	Advanced	Expert
Background Jobs & Task Queues
Task Queues	Awareness	Working	Advanced	Advanced	Expert
Search Engines
Elasticsearch / OpenSearch	Awareness	Working	Advanced	Advanced	Expert

9 skills · 45 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Relational Databases
PostgreSQL	Awareness	Working	Advanced	Advanced	Expert
MySQL / MariaDB	Awareness	Working	Advanced	Advanced	Expert
Database Optimization
Database Indexing	Awareness	Working	Advanced	Advanced	Expert
Query Optimization	Awareness	Working	Advanced	Advanced	Expert
Transactions & Concurrency	Awareness	Working	Advanced	Advanced	Expert
Connection Pooling	Awareness	Working	Working	Advanced	Advanced
Database Sharding	Awareness	Working	Working	Advanced	Advanced
Data Modeling
Data Modeling & Schema Design	Awareness	Working	Advanced	Advanced	Expert
Database Migrations	Awareness	Working	Advanced	Advanced	Expert

9 skills · 45 requirements

Skill	Junior	Middle	Senior	Lead	Principal
REST API
REST API Design	Awareness	Working	Advanced	Advanced	Expert
GraphQL
GraphQL Design	Awareness	Working	Advanced	Advanced	Expert
API Protocols
WebSocket API Design	Awareness	Working	Working	Advanced	Advanced
gRPC & Protocol Buffers	Awareness	Working	Working	Advanced	Advanced
gRPC
gRPC & Protocol Buffers	Awareness	Working	Working	Advanced	Advanced
API Management
API Versioning Strategies	Awareness	Working	Advanced	Advanced	Expert
API Documentation	Awareness	Working	Advanced	Advanced	Expert
API Testing	Awareness	Working	Advanced	Advanced	Expert
Rate Limiting & Throttling	Awareness	Working	Working	Advanced	Advanced

5 skills · 23 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Containerization
Docker	Awareness	Working	Working	Advanced	Advanced
Kubernetes & Orchestration
Kubernetes Core	Awareness	Working	Working	Advanced	Advanced
Infrastructure as Code
Terraform	Awareness	Working	Working	Advanced	Advanced
Cloud Providers
AWS	Awareness	Working	Working	Advanced	Advanced
Networking
Network Fundamentals	Awareness	Working	Advanced	—	—

1 skills · 5 requirements

Skill	Junior	Middle	Senior	Lead	Principal
CI/CD
GitHub Actions / GitLab CI	Awareness	Working	Working	Advanced	Advanced

4 skills · 20 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Test Strategy
TDD & BDD	Awareness	Working	Working	Advanced	Expert
Unit Testing
Unit Testing	Awareness	Working	Working	Advanced	Advanced
Integration Testing
Integration Testing	Awareness	Working	Working	Advanced	Advanced
E2E Testing
E2E Testing	Awareness	Working	Working	Advanced	Advanced

3 skills · 15 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Application Security
OWASP & Application Security	Awareness	Working	Working	Advanced	Advanced
Secure Coding Practices	Awareness	Working	Working	Advanced	Advanced
Authentication & Authorization
JWT / OAuth2 / OIDC	Awareness	Working	Working	Advanced	Expert

4 skills · 18 requirements

Skill	Junior	Middle	Senior	Lead	Principal
AI Coding Assistants
GitHub Copilot	Awareness	Working	Working	Advanced	Advanced
Cursor IDE	Awareness	Working	Working	Advanced	—
ChatGPT / Claude	Awareness	Working	Working	Advanced	Advanced
Prompt Engineering
Prompt Engineering for Code	Awareness	Working	Working	Advanced	—

5 skills · 25 requirements

Skill	Junior	Middle	Senior	Lead	Principal
System Design
System Design Fundamentals	Awareness	Working	Working	Advanced	Advanced
Microservices Patterns
Microservices Decomposition	Awareness	Working	Working	Advanced	Advanced
Architecture Patterns
Clean Architecture	Awareness	Working	Working	Advanced	Expert
Event-Driven Architecture
CQRS	Awareness	Working	Working	Advanced	Advanced
Event-Driven Architecture	Awareness	Working	Working	Advanced	Advanced

5 skills · 25 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Logging
Structured Logging	Awareness	Working	Working	Advanced	Advanced
ELK Stack	Awareness	Working	Working	Advanced	Advanced
Metrics & Monitoring
Prometheus & Grafana	Awareness	Working	Working	Advanced	Advanced
Distributed Tracing
OpenTelemetry	Awareness	Working	Working	Advanced	Advanced
Alerting & On-Call
SLI / SLO / SLA	Awareness	Working	Working	Advanced	Advanced

2 skills · 10 requirements

Skill	Junior	Middle	Senior	Lead	Principal
Git & Workflows
Git Advanced	Awareness	Working	Working	Advanced	Advanced
Code Review
Code Review	Awareness	Working	Working	Advanced	Advanced

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