What a Mid-level } should know

0 core skills, 58 in total. Expectations per skill, and what changes at the next level.

This page lists what a Mid-level } 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

58additional skills

0skill areas

0%at Advanced or Expert

Assess myself as Mid-level Full role matrix

Core skills for a Mid-level

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.

Apache Kafka API Documentation ChatGPT / Claude Database Indexing E2E Testing Integration Testing JWT / OAuth2 / OIDC Network Fundamentals PostgreSQL Prompt Engineering for Code Query Optimization Redis Secure Coding Practices Type Safety & Type Systems Unit Testing Algorithms & Complexity API Gateway Architecture Decision Records (ADR)Architecture Documentation: C4, arc42 Architecture Fitness Functions Async Programming AWS Clean Architecture Code Quality & Refactoring Code Review Data Structures DDD Strategic Patterns DDD Tactical Patterns Design Patterns Diagramming: Mermaid, PlantUML, D2 Docker Documentation as Code Feature Flags Git Advanced GitHub Actions / GitLab CI GitHub Copilot GraphQL Design gRPC & Protocol Buffers Hexagonal Architecture High Load Architecture InnerSource Practices Kubernetes Core Microservices Decomposition Monorepo Tools Multithreading On-Call Management OOP & SOLID Principles OpenTelemetry OWASP & Application Security Prometheus & Grafana REST API Design Secrets Management SLI / SLO / SLA Structured Logging System Design Fundamentals Technical Debt Management Technology Radar Practice Terraform

What changes at Senior

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

Algorithms & Complexity: Awareness → Working · becomes core
API Gateway: Awareness → Working · becomes core
Architecture Decision Records (ADR): Awareness → Working · becomes core
Architecture Documentation: C4, arc42: Awareness → Working · becomes core
Architecture Fitness Functions: Awareness → Working · becomes core
Async Programming: Awareness → Working · becomes core
AWS: Awareness → Working · becomes core
Clean Architecture: Awareness → Working · becomes core
Code Quality & Refactoring: Awareness → Working · becomes core
Code Review: Awareness → Working · becomes core

See the Senior page →

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} in the open competency matrix: 58 skills across 5 levels. The matrix is free for individuals and stays free.