Backend Developer (Node.js)
Building server-side applications and APIs with Node.js/TypeScript
Backend Developer (Node.js) is a role in the Backend Engineering family. It has 69 skills across 5 levels (from Junior to Principal). 205 skills are mandatory. Key domains: Programming Fundamentals, Backend Development, Database Management.
Technology Stack
Focus by Level
Building REST APIs with Express/NestJS. Writing unit tests (Jest). Working with Prisma/TypeORM. Fixing bugs. Learning TypeScript.
Designing microservices with NestJS. Working with WebSockets. Optimizing event loop. Integrating with message brokers. TypeScript strict mode. Code review.
Node.js application architecture. Memory and CPU optimization (clinic.js). Designing real-time systems. Building npm packages. Choosing between Node.js and Bun/Deno.
Microservice platform architecture on Node.js. Standardizing TypeScript development. Mono-repo strategy (Nx/Turborepo). Backend for Frontend (BFF).
Full-stack platform strategy. Choosing runtime (Node.js/Bun/Deno). Architecture for scale. Open-source contributions.
Skill Matrix
69 skills × 5 levels. Click on a cell for details.
AI-Assisted Development
4 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| GitHub Copilot | A | W | A | E | E |
| Cursor IDE | A | W | A | A | — |
| ChatGPT / Claude | A | W | A | E | E |
| Prompt Engineering for Code | A | W | A | E | — |
API & Integration
9 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| REST API Design | A | W | A | E | E |
| GraphQL Design | A | W | A | E | E |
| WebSocket API Design | A | W | A | E | E |
| gRPC & Protocol Buffers | A | W | A | E | E |
| gRPC & Protocol Buffers | A | W | A | E | E |
| API Versioning Strategies | A | W | A | E | E |
| API Documentation | A | W | A | E | E |
| API Testing | A | W | A | E | E |
| Rate Limiting & Throttling | A | W | A | E | E |
Architecture & System Design
5 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| System Design Fundamentals | A | W | A | E | E |
| Microservices Decomposition | A | W | A | E | E |
| Clean Architecture | A | W | A | E | E |
| CQRS | A | W | A | E | E |
| Event-Driven Architecture | A | W | A | E | E |
Backend Development
8 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Python Web Frameworks | A | W | A | E | E |
| Node.js Frameworks | A | W | A | E | E |
| Apache Kafka | A | W | A | E | E |
| RabbitMQ | A | W | A | E | E |
| Message Broker Patterns | A | W | A | E | E |
| Redis | A | W | A | E | E |
| Caching Strategies | A | W | A | E | E |
| Task Queues | A | W | A | E | E |
Cloud & Infrastructure
5 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Docker | A | W | A | E | E |
| Kubernetes Core | A | W | A | E | E |
| Terraform | A | W | A | E | E |
| AWS | A | W | A | E | E |
| Network Fundamentals | A | W | A | — | — |
Database Management
8 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| PostgreSQL | A | W | A | E | E |
| MongoDB | A | W | A | E | E |
| Database Indexing | A | W | A | E | E |
| Query Optimization | A | W | A | E | E |
| Connection Pooling | A | W | A | E | E |
| Database Sharding | A | W | A | E | E |
| Data Modeling & Schema Design | A | W | A | E | E |
| Database Migrations | A | W | A | E | E |
DevOps & CI/CD
1 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| GitHub Actions / GitLab CI | A | W | A | E | E |
Observability & Monitoring
5 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Structured Logging | A | W | A | E | E |
| ELK Stack | A | W | A | E | E |
| Prometheus & Grafana | A | W | A | E | E |
| OpenTelemetry | A | W | A | E | E |
| SLI / SLO / SLA | A | W | A | E | E |
Performance Engineering
3 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| CPU Profiling | A | W | A | E | E |
| Latency Optimization | A | W | A | E | E |
| Performance Budgets | A | W | A | E | E |
Programming Fundamentals
10 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Algorithms & Complexity | A | W | A | E | E |
| Data Structures | A | W | A | E | E |
| OOP & SOLID Principles | A | W | A | E | E |
| Design Patterns | A | W | A | E | E |
| Multithreading | A | W | A | E | E |
| Async Programming | A | W | A | E | E |
| Code Quality & Refactoring | A | W | A | E | E |
| Functional Programming Principles | A | W | A | E | E |
| Type Safety & Type Systems | A | W | A | E | E |
| Memory Management | A | W | A | E | E |
Security
4 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| OWASP & Application Security | A | W | A | E | E |
| Secure Coding Practices | A | W | A | E | E |
| Secrets Management | A | W | A | E | E |
| JWT / OAuth2 / OIDC | A | W | A | E | E |
Testing & QA
4 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| TDD & BDD | A | W | A | E | E |
| Unit Testing | A | W | A | E | E |
| Integration Testing | A | W | A | E | E |
| E2E Testing | A | W | A | E | E |
Version Control & Collaboration
3 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Git Advanced | A | W | A | E | E |
| Code Review | A | W | A | E | E |
| Documentation as Code | A | W | A | E | E |
FAQ
What skills are needed for the Backend Developer (Node.js) role?
The Backend Developer (Node.js) role requires 69 skills, of which 205 are mandatory. Skills are distributed across 5 levels: from Junior to Principal. See full matrix.
How to advance to the next level in the Backend Developer (Node.js) role?
Use the Grade Calculator to assess your current level and get personalized recommendations. The system will show which skills need to be developed for the next level.
What tech stack is used in the Backend Developer (Node.js) role?
The stack includes 5 technologies at different levels. Node.js 20+, TypeScript 5.3+, Express/NestJS, PostgreSQL, Prisma/TypeORM, Jest, Docker, REST API, Node.js 22+, TypeScript strict, NestJS, PostgreSQL/Redis/MongoDB, Bull/BullMQ, Socket.io, Docker Compose, CI/CD, ESLint + Prettier, Node.js 22+, Custom middleware, PostgreSQL/Redis/Elasticsearch, Kafka/RabbitMQ, clinic.js, Kubernetes basics, OpenTelemetry, GraphQL Federation...
How does the community define requirements for the Backend Developer (Node.js) role?
Role requirements are shaped by the community through a proposal system. Any member can suggest changes that go through voting and expert review.