What a Junior } should know

0 core skills, 15 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

15additional 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.

API Documentation Async Programming ChatGPT / Claude Cursor IDE GraphQL Design Integration Testing Multithreading Network Fundamentals OpenTelemetry PostgreSQL Prompt Engineering for Code Redis Secure Coding Practices Type Safety & Type Systems Unit Testing

What changes at Mid-level

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

Algorithms & Complexity: — → Awareness
API Documentation: Awareness → Working
Architecture Decision Records (ADR): — → Awareness
Architecture Documentation: C4, arc42: — → Awareness
Architecture Fitness Functions: — → Awareness
Async Programming: Awareness → Working
AWS: — → Awareness
Capacity Planning: — → Awareness
ChatGPT / Claude: Awareness → Working
Code Quality & Refactoring: — → Awareness

See the Mid-level page →

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Self-assessment plus manager and peer reviews against the same matrix, gap analysis and next-level readiness for every engineer. Team Pro is free for 14 days; individual tools stay free forever.

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} in the open competency matrix: 15 skills across 5 levels. The matrix is free for individuals and stays free.