What a Junior } should know

0 core skills, 53 in total. Expectations per skill, and what changes at the next level.

This page lists what a Junior } is expected to know and do, skill by skill. Core skills are the ones a manager and peers assess in a review cycle; the rest count only in self-assessment. Main areas: .

0core skills

53additional skills

0skill areas

0%at Advanced or Expert

Assess myself as Junior Full role matrix

Core skills for a Junior

Grouped by area. The label on the right is the expected depth: Awareness, Working, Advanced or Expert.

Additional skills

Not assessed by the team, but part of the self-assessment and the development plan.

AI Agent Frameworks AI Agents for Development AI Code Review AI Test Generation Algorithms & Complexity Apache Kafka API Documentation Async Programming AWS ChatGPT / Claude Claude Code / Agentic Coding Code Quality & Refactoring Code Review Cursor IDE Data Structures Database Indexing Design Patterns Docker E2E Testing Feature Flags Git Advanced GitHub Actions / GitLab CI GitHub Copilot GraphQL Design Integration Testing Kubernetes Core LLM Applications LLM Evaluation Model Context Protocol (MCP)Model Serving Multithreading Network Fundamentals Node.js Frameworks OOP & SOLID Principles OpenTelemetry OWASP & Application Security PostgreSQL Prometheus & Grafana Prompt Engineering for Code Python Web Frameworks RAG Architecture Redis REST API Design Secure Coding Practices Serverless Functions Structured Logging System Design Fundamentals Task Queues Terraform Type Safety & Type Systems Unit Testing Vector Databases WebSocket API Design

What changes at Mid-level

53 skills get a higher expectation or become core when moving from Junior to Mid-level. The biggest jumps first.

AI Agent Frameworks: Awareness → Working
AI Agents for Development: Awareness → Working
AI Code Review: Awareness → Working
AI Test Generation: Awareness → Working
Algorithms & Complexity: Awareness → Working
Apache Kafka: Awareness → Working
API Documentation: Awareness → Working
Async Programming: Awareness → Working
AWS: Awareness → Working
ChatGPT / Claude: Awareness → Working

See the Mid-level page →

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} in the open competency matrix: 53 skills across 5 levels. The matrix is free for individuals and stays free.