Backend Engineering HIGH DEMAND

Backend Developer (Java/Kotlin)

Developing enterprise-grade backend services in Java/Kotlin with a focus on reliability and scalability

Learn more about role All roles
74 skills
359 requirements
217 mandatory
13 domains
Awareness 74 Working 74 Advanced 75 Expert 136
Level:
All domains Programming Fundamentals 10 Backend Development 8 Database Management 9 API & Integration 8 Cloud & Infrastructure 6 DevOps & CI/CD 1 Testing & QA 5 Security 4 AI-Assisted Development 4 Architecture & System Design 6 Observability & Monitoring 6 Version Control & Collaboration 3 Performance Engineering 4
Profiles: Awareness Working Advanced Expert -- Click level to expand, click requirement for details and voting

Programming Fundamentals

10 skills · 50 requirements
Skill Junior Middle Senior Lead Principal
Algorithms & Data Structures
Algorithms & Complexity Awareness Working Advanced Expert Expert
Data Structures Awareness Working Advanced Expert Expert
OOP & Design Patterns
OOP & SOLID Principles Awareness Working Advanced Expert Expert
Design Patterns Awareness Working Advanced Expert Expert
Concurrency & Parallelism
Multithreading Awareness Working Advanced Expert Expert
Async Programming Awareness Working Advanced Expert Expert
Clean Code & Refactoring
Code Quality & Refactoring Awareness Working Advanced Expert Expert
Type Systems
Type Safety & Type Systems Awareness Working Advanced Expert Expert
Generics & Parametric Polymorphism Awareness Working Advanced Expert Expert
Memory Management
Memory Management Awareness Working Advanced Expert Expert

Backend Development

8 skills · 40 requirements
Skill Junior Middle Senior Lead Principal
Web Frameworks
Python Web Frameworks Awareness Working Advanced Expert Expert
Java Spring Ecosystem Awareness Working Advanced Expert Expert
Message Queues & Event Streaming
Apache Kafka Awareness Working Advanced Expert Expert
RabbitMQ Awareness Working Advanced Expert Expert
Message Broker Patterns Awareness Working Advanced Expert Expert
Caching
Redis Awareness Working Advanced Expert Expert
Caching Strategies Awareness Working Advanced Expert Expert
Search Engines
Elasticsearch / OpenSearch Awareness Working Advanced Expert Expert

Database Management

9 skills · 45 requirements
Skill Junior Middle Senior Lead Principal
Relational Databases
PostgreSQL Awareness Working Advanced Expert Expert
MySQL / MariaDB Awareness Working Advanced Expert Expert
Database Optimization
Database Indexing Awareness Working Advanced Expert Expert
Query Optimization Awareness Working Advanced Expert Expert
Transactions & Concurrency Awareness Working Advanced Expert Expert
Connection Pooling Awareness Working Advanced Expert Expert
Database Sharding Awareness Working Advanced Expert Expert
Data Modeling
Data Modeling & Schema Design Awareness Working Advanced Expert Expert
Database Migrations Awareness Working Advanced Expert Expert

API & Integration

8 skills · 40 requirements
Skill Junior Middle Senior Lead Principal
REST API
REST API Design Awareness Working Advanced Expert Expert
GraphQL
GraphQL Design Awareness Working Advanced Expert Expert
API Protocols
WebSocket API Design Awareness Working Advanced Expert Expert
gRPC & Protocol Buffers Awareness Working Advanced Expert Expert
gRPC
gRPC & Protocol Buffers Awareness Working Advanced Expert Expert
API Management
API Versioning Strategies Awareness Working Advanced Expert Expert
API Documentation Awareness Working Advanced Expert Expert
Rate Limiting & Throttling Awareness Working Advanced Expert Expert

Cloud & Infrastructure

6 skills · 27 requirements
Skill Junior Middle Senior Lead Principal
Containerization
Docker Awareness Working Advanced Expert Expert
Container Security
Container Security Scanning Awareness Working Advanced Expert Expert
Kubernetes & Orchestration
Kubernetes Core Awareness Working Advanced Expert Expert
Infrastructure as Code
Terraform Awareness Working Advanced Expert —
Cloud Providers
AWS Awareness Working Advanced Expert Expert
Networking
Network Fundamentals Awareness Working Advanced — —

DevOps & CI/CD

1 skills · 5 requirements
Skill Junior Middle Senior Lead Principal
CI/CD
GitHub Actions / GitLab CI Awareness Working Advanced Expert Expert

Testing & QA

5 skills · 25 requirements
Skill Junior Middle Senior Lead Principal
Test Strategy
TDD & BDD Awareness Working Advanced Expert Expert
Unit Testing
Unit Testing Awareness Working Advanced Expert Expert
Integration Testing
Integration Testing Awareness Working Advanced Expert Expert
E2E Testing
E2E Testing Awareness Working Advanced Expert Expert
Test Infrastructure
TestContainers Awareness Working Advanced Expert Expert

Security

4 skills · 20 requirements
Skill Junior Middle Senior Lead Principal
Application Security
OWASP & Application Security Awareness Working Advanced Expert Expert
Secure Coding Practices Awareness Working Advanced Expert Expert
Infrastructure Security
Secrets Management Awareness Working Advanced Expert Expert
Authentication & Authorization
JWT / OAuth2 / OIDC Awareness Working Advanced Expert Expert

AI-Assisted Development

4 skills · 18 requirements
Skill Junior Middle Senior Lead Principal
AI Coding Assistants
GitHub Copilot Awareness Working Advanced Expert Expert
Cursor IDE Awareness Working Advanced Advanced —
ChatGPT / Claude Awareness Working Advanced Expert Expert
Prompt Engineering
Prompt Engineering for Code Awareness Working Advanced Expert —

Architecture & System Design

6 skills · 26 requirements
Skill Junior Middle Senior Lead Principal
System Design
System Design Fundamentals Awareness Working Advanced Expert Expert
Microservices Patterns
Microservices Decomposition — Awareness Working Advanced —
Architecture Patterns
Clean Architecture Awareness Working Advanced Expert Expert
Event-Driven Architecture
CQRS Awareness Working Advanced Expert Expert
Event-Driven Architecture Awareness Working Advanced Expert Expert
Domain-Driven Design
DDD Tactical Patterns — Awareness Working Advanced —

Observability & Monitoring

6 skills · 28 requirements
Skill Junior Middle Senior Lead Principal
Logging
Structured Logging Awareness Working Advanced Expert Expert
ELK Stack Awareness Working Advanced Expert Expert
Metrics & Monitoring
Prometheus & Grafana Awareness Working Advanced Expert Expert
Distributed Tracing
OpenTelemetry Awareness Working Advanced Expert Expert
Alerting & On-Call
SLI / SLO / SLA Awareness Working Advanced — —
Incident Management
On-Call Management Awareness Working Advanced Expert Expert

Version Control & Collaboration

3 skills · 15 requirements
Skill Junior Middle Senior Lead Principal
Git & Workflows
Git Advanced Awareness Working Advanced Expert Expert
Code Review
Code Review Awareness Working Advanced Expert Expert
Collaboration Tools
Documentation as Code Awareness Working Advanced Expert Expert

Performance Engineering

4 skills · 20 requirements
Skill Junior Middle Senior Lead Principal
Profiling
CPU Profiling Awareness Working Advanced Expert Expert
Memory Profiling Awareness Working Advanced Expert Expert
Optimization
Latency Optimization Awareness Working Advanced Expert Expert
Benchmarking
Performance Budgets Awareness Working Advanced Expert Expert
Is this requirement useful?