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Hard skills of a NestJS Developer

As a NestJS Developer, having strong hard skills is crucial to excel in the role. Here are the key hard skills required at different levels of expertise:

Junior

• TypeScript: Proficient in using TypeScript, the primary language for NestJS development, to write clean and scalable code.
• NestJS Framework: Familiarity with the NestJS framework and its core concepts, such as modules, controllers, providers, and decorators.
• RESTful APIs: Understanding of building and consuming RESTful APIs using NestJS, including handling routes, requests, and responses.
• Database Integration: Basic knowledge of integrating and working with databases, such as MySQL or MongoDB, using NestJS modules like TypeORM or Mongoose.
• Unit Testing: Familiarity with writing unit tests using tools like Jest to ensure the quality and reliability of the code.

Middle

• Advanced TypeScript: Proficiency in advanced TypeScript concepts, such as generics, decorators, and advanced type inference.
• Authentication and Authorization: Experience in implementing authentication and authorization mechanisms, such as JWT, OAuth, or Passport.js, within NestJS applications.
• WebSockets: Knowledge of using WebSockets to enable real-time communication and build interactive features in NestJS applications.
• Microservices: Understanding of building and integrating microservices using NestJS, including inter-service communication and event-driven architectures.
• Performance Optimization: Ability to optimize NestJS applications for performance, including caching strategies, query optimization, and efficient resource utilization.
• Containerization: Familiarity with containerization technologies like Docker and container orchestration platforms like Kubernetes for deploying and managing NestJS applications.
• Continuous Integration/Deployment: Experience with CI/CD pipelines using tools like Jenkins or GitLab CI to automate the build, test, and deployment processes.

Senior

• Advanced Design Patterns: Proficiency in applying advanced design patterns, such as Dependency Injection, Singleton, Factory, and Observer, to build highly maintainable and scalable NestJS applications.
• Advanced Database Integration: Expertise in working with databases at a deeper level, including query optimization, indexing, database migrations, and ORM customization.
• Performance Monitoring and Optimization: Ability to monitor and analyze application performance using tools like New Relic or Datadog, and optimize the application based on performance metrics.
• Message Brokers: Knowledge of using message brokers like RabbitMQ or Apache Kafka for building distributed and scalable systems in NestJS.
• Security Best Practices: Understanding of security best practices, such as input validation, data encryption, secure session management, and protection against common vulnerabilities.
• Code Review and Mentoring: Experience in conducting code reviews, providing constructive feedback, and mentoring junior developers to improve code quality and maintainability.
• Infrastructure as Code: Familiarity with infrastructure automation tools like Terraform or AWS CloudFormation to provision and manage cloud resources for NestJS applications.
• Agile Methodologies: Proficiency in Agile methodologies like Scrum or Kanban, including participating in sprint planning, backlog grooming, and facilitating agile ceremonies.

Expert/Team Lead

• Architecture Design: Expertise in designing scalable, maintainable, and modular architecture for large-scale NestJS applications, considering factors like scalability, fault tolerance, and ease of maintenance.
• Performance Tuning: Ability to fine-tune the performance of NestJS applications at both the application and infrastructure levels, optimizing bottlenecks and ensuring high availability.
• Team Leadership: Experience in leading and managing a team of developers, providing technical guidance, setting priorities, and ensuring successful project delivery.
• DevOps Practices: Proficiency in DevOps practices, including infrastructure automation, continuous integration, continuous deployment, and monitoring for NestJS applications.
• Advanced Testing Strategies: Expertise in implementing advanced testing strategies, such as integration testing, end-to-end testing, and test-driven development (TDD), to ensure comprehensive code coverage.
• Code Quality and Standards: Ability to enforce coding standards, conduct code reviews, and implement tools like ESLint or Prettier to maintain high code quality throughout the project.
• Performance Reviews: Experience in conducting performance reviews for team members, identifying areas for improvement, and providing feedback to enhance individual and team performance.
• Client Interaction: Proficiency in client communication and understanding business requirements, collaborating with stakeholders, and providing technical recommendations.
• Technical Documentation: Skill in creating comprehensive technical documentation, including architecture diagrams, API documentation, and development guidelines.
• Continuous Learning: Dedication to continuous learning and staying updated with the latest trends, best practices, and emerging technologies in the NestJS ecosystem.
• Problem Solving and Troubleshooting: Expertise in analyzing complex problems, identifying root causes, and implementing effective solutions to ensure smooth operation of NestJS applications.

Soft skills of a NestJS Developer

Soft skills are essential for a NestJS Developer as they not only contribute to their individual growth but also play a crucial role in the success of development projects. These skills allow developers to effectively collaborate, communicate, and adapt to changing circumstances in the software development environment.

Junior

• Active Listening: Ability to attentively listen and understand requirements, feedback, and instructions from team members and clients.
• Problem-Solving: Aptitude for analyzing and resolving issues by applying logical thinking and troubleshooting techniques.
• Time Management: Skill to prioritize tasks, manage deadlines, and deliver work within specified timelines.
• Attention to Detail: Attentiveness to small details to ensure accuracy and quality of code and project deliverables.
• Teamwork: Ability to collaborate with other developers, testers, and stakeholders to achieve project goals collectively.

Middle

• Leadership: Capability to take ownership of tasks, guide junior developers, and lead small project teams.
• Communication: Proficiency in conveying technical concepts and ideas clearly to both technical and non-technical stakeholders.
• Adaptability: Flexibility to adapt to changing requirements, technologies, and project dynamics.
• Critical Thinking: Aptitude for analyzing complex problems, evaluating multiple solutions, and making informed decisions.
• Conflict Resolution: Ability to identify and resolve conflicts or disagreements within the development team.
• Collaboration: Skill to work seamlessly with cross-functional teams, such as designers, QA engineers, and product managers.
• Client-Facing Skills: Proficiency in interacting with clients, understanding their needs, and providing effective solutions.

Senior

• Mentorship: Capability to mentor and guide junior and mid-level developers, sharing knowledge and best practices.
• Strategic Thinking: Ability to align development efforts with business objectives and long-term project goals.
• Negotiation: Skill to negotiate project requirements, timelines, and resources with stakeholders.
• Project Management: Proficiency in managing complex development projects, including planning, execution, and delivery.
• Empathy: Understanding and considering the perspectives and needs of team members and clients.
• Continuous Learning: Commitment to staying updated with the latest technologies and industry trends.
• Quality Assurance: Ensuring code quality through code reviews, testing, and adherence to coding standards.
• Risk Management: Ability to identify and mitigate potential risks that may impact project success.

Expert/Team Lead

• Strategic Leadership: Ability to provide strategic direction to development teams and align with overall business objectives.
• Team Management: Skill to manage and motivate large development teams, ensuring productivity and collaboration.
• Influence and Persuasion: Capability to influence decisions and gain buy-in from stakeholders through effective communication.
• Conflict Management: Proficiency in managing conflicts within the team or with external stakeholders.
• Business Acumen: Understanding of business processes and the ability to make informed decisions considering financial and operational factors.
• Innovation: Encouraging a culture of innovation, exploring new technologies, and driving continuous improvement.
• Client Relationship Management: Building and maintaining strong relationships with clients, understanding their needs, and managing expectations.
• Decision-Making: Ability to make critical decisions based on analysis, experience, and an understanding of project requirements and constraints.
• Technical Expertise: Deep knowledge and expertise in NestJS and related technologies, serving as a go-to resource for technical guidance.
• Strategic Planning: Capability to plan and execute long-term development strategies, considering market trends and business goals.
• Risk Assessment: Proficiency in identifying, assessing, and managing risks at a project and organizational level.

Cases when NestJS does not work

1. Unsupported Databases: NestJS is primarily designed to work with popular databases like MySQL, PostgreSQL, MongoDB, and SQLite. If you are using a less common or proprietary database, you may encounter difficulties integrating it with NestJS. In such cases, you might need to write custom code or use community-supported plugins to make it work.
2. Legacy Systems: If you are working with legacy systems built on outdated technologies or frameworks, NestJS might not be the best choice. Since NestJS is built on top of modern JavaScript frameworks like Express and TypeScript, it may not easily integrate with older codebases or technologies.
3. Resource Constraints: NestJS, like any other framework, requires a certain level of computing resources to run efficiently. If you are working with very limited resources, such as low-powered devices or constrained environments, NestJS may not be suitable due to its resource requirements.
4. Compatibility Issues: In some cases, you may encounter compatibility issues when using NestJS with other libraries, frameworks, or tools. This can happen if there are conflicting dependencies or if certain features of NestJS are not supported by other components of your tech stack. It is important to thoroughly research and test compatibility before committing to using NestJS.
5. Learning Curve: While NestJS provides a well-structured framework for building scalable applications, it does come with a learning curve, especially if you are new to TypeScript or modern JavaScript frameworks. If you or your team lacks the necessary experience or time to familiarize yourself with these technologies, it might be challenging to work with NestJS effectively.

TOP 10 NestJS Related Technologies

• Languages: JavaScript

  JavaScript is a widely adopted language for NestJS development. It is the primary language used for building server-side applications and offers extensive libraries and frameworks for web development.

• Framework: NestJS

  NestJS is a powerful and popular framework for building scalable and efficient server-side applications. It is built on top of Node.js and utilizes TypeScript for enhanced productivity and maintainability.

• Database: PostgreSQL

  PostgreSQL is a highly reliable and feature-rich open-source relational database management system. It offers robust data integrity and ACID compliance, making it an ideal choice for NestJS applications that require structured data storage.

• ORM: TypeORM

  TypeORM is a widely used Object-Relational Mapping (ORM) library for TypeScript. It provides an intuitive way to interact with databases by mapping database tables to TypeScript classes and simplifying database operations.

• Authentication: Passport.js

  Passport.js is a flexible authentication middleware for Node.js. It supports various authentication strategies, including JWT, OAuth, and session-based authentication, making it a popular choice for securing NestJS applications.

• Testing: Jest

  Jest is a popular JavaScript testing framework widely used in the NestJS ecosystem. It provides a simple and efficient way to write unit tests, integration tests, and end-to-end tests, ensuring the reliability and quality of NestJS applications.

• Containerization: Docker

  Docker is a containerization platform that allows developers to package applications and their dependencies into lightweight, isolated containers. It simplifies the deployment and scaling of NestJS applications, making them more portable and efficient.

TOP 11 Tech facts and history of creation and versions about NestJS Development

• NestJS is a progressive Node.js framework for building efficient, reliable, and scalable server-side applications. It follows the modular design pattern and is heavily influenced by Angular.
• It was created in 2017 by Kamil Myśliwiec, a software engineer from Poland, who wanted to provide developers with a robust and opinionated framework for building server-side applications.
• NestJS leverages TypeScript, a statically-typed superset of JavaScript, to enable developers to write cleaner, more organized code. It provides enhanced productivity and better tooling support.
• The framework is built on top of Express, one of the most popular Node.js frameworks, and adds additional features like dependency injection, decorators, and modules to enhance developer experience.
• NestJS embraces the concept of “SOLID” principles, which promotes separation of concerns and maintainability of code. It encourages developers to write modular and testable code.
• One of the groundbreaking features of NestJS is its built-in support for WebSockets, allowing real-time bidirectional communication between clients and servers. This makes it ideal for building chat applications, collaborative tools, and more.
• NestJS also provides out-of-the-box support for GraphQL, a query language for APIs, making it easier to build efficient and flexible APIs that can adapt to changing client requirements.
• Since its release, NestJS has gained significant popularity within the Node.js community and has a strong and active open-source community. It has over 28k stars on GitHub and continues to receive regular updates and bug fixes.
• The framework follows semantic versioning, with each release introducing new features, bug fixes, and performance improvements. It has a well-documented changelog, making it easy for developers to keep track of updates.
• NestJS has a comprehensive ecosystem of plugins and libraries, ranging from database connectors to authentication providers, making it easy to integrate with other tools and services.
• Several large organizations, including Microsoft, Siemens, and Audi, have adopted NestJS for their server-side development needs, highlighting its maturity and suitability for enterprise-grade applications.

Pros & cons of NestJS

9 Pros of NestJS

• Modular and scalable: NestJS follows a modular architecture that allows developers to easily organize their code into modules. This makes it highly scalable and helps in maintaining a clean and structured codebase.
• TypeScript support: NestJS is built with TypeScript, a statically typed superset of JavaScript. This provides developers with features like type checking, interfaces, and decorators, making the code more robust and maintainable.
• Dependency injection: NestJS leverages dependency injection, which allows for the easy management of dependencies between different modules. This promotes code reusability, testability, and maintainability.
• Powerful CLI: NestJS provides a powerful command-line interface (CLI) that automates common tasks such as generating modules, controllers, and services. This saves developers time and effort in setting up the project structure.
• Built-in support for HTTP frameworks: NestJS comes with built-in support for popular HTTP frameworks like Express and Fastify. This allows developers to leverage the features and performance of these frameworks while benefiting from the additional features provided by NestJS.
• Robust middleware support: NestJS provides a robust middleware system that allows developers to easily intercept and modify HTTP requests and responses. This enables features like authentication, logging, and error handling to be implemented with ease.
• Out-of-the-box testing utilities: NestJS provides a comprehensive set of testing utilities that make it easy to write unit tests, integration tests, and end-to-end tests for your application. This helps ensure the quality and reliability of your code.
• Extensive ecosystem: NestJS has a thriving ecosystem with a wide range of third-party libraries and plugins available. This allows developers to easily integrate with other tools and services, saving development time and effort.
• Active community and support: NestJS has a growing community of developers who actively contribute to its development and provide support through forums, documentation, and online communities. This ensures that developers have access to resources and assistance when needed.

9 Cons of NestJS

• Learning curve: The learning curve for NestJS can be steep, especially for developers who are not familiar with TypeScript or the concepts of dependency injection and modular architecture. However, the extensive documentation and resources available can help mitigate this challenge.
• Performance overhead: While NestJS provides additional features and abstractions, it may introduce a performance overhead compared to more lightweight frameworks. However, this overhead can be minimized through proper optimization and caching techniques.
• Limited adoption: As a relatively new framework, NestJS may not have the same level of adoption and community support as more established frameworks like Express or Django. However, its growing popularity indicates a positive trend in adoption.
• Strict convention and structure: NestJS enforces a strict convention and structure for organizing code. While this promotes maintainability and readability, it may limit flexibility for developers who prefer more freedom in code organization.
• Limited support for non-Node.js environments: NestJS is primarily designed for Node.js environments and may not have the same level of support or compatibility with other platforms. However, efforts are being made to expand its compatibility with frameworks like React Native and Angular.
• Steep deployment learning curve: Deploying a NestJS application can be more complex compared to simpler frameworks. However, with proper documentation and deployment guides, developers can overcome this challenge.
• Relatively small plugin ecosystem: While NestJS has a growing ecosystem, it may not have the same level of plugins and extensions available as more established frameworks. However, this is improving over time as the community continues to contribute.
• Less suitable for small projects: The extensive features and abstractions provided by NestJS might be overkill for small projects with simple requirements. In such cases, a more lightweight framework might be more suitable.
• Steep migration curve: If you are migrating an existing project to NestJS, there may be a learning curve and effort required to refactor and adapt the codebase to fit the NestJS conventions and architecture. However, this effort can be worthwhile in the long run for larger projects.

TOP 11 Facts about NestJS

• NestJS is a popular open-source framework for building scalable and efficient server-side applications using Node.js.
• It is built on top of Express.js, which is a widely-used web application framework for Node.js.
• NestJS uses TypeScript as its primary language, which allows for strong typing, enhanced tooling, and better maintainability compared to JavaScript.
• One of the key features of NestJS is its modularity. It provides a modular architecture that allows developers to easily organize their code into reusable and independent modules, making it easier to manage and scale complex applications.
• With NestJS, developers can leverage decorators to define and enhance the functionality of their classes and methods. Decorators provide a clean and intuitive way to add features such as authentication, validation, and caching to the application.
• NestJS follows the dependency injection design pattern, which promotes loose coupling and testability. This pattern allows for better code organization and easier unit testing, making it an ideal choice for building robust and maintainable applications.
• It provides a powerful built-in dependency injection container that automatically resolves and injects dependencies into classes, reducing the boilerplate code required for manual dependency management.
• NestJS integrates seamlessly with other popular libraries and frameworks, such as TypeORM (for object-relational mapping), GraphQL (for efficient API development), and Passport (for authentication).
• It offers a comprehensive CLI (Command Line Interface) tool that simplifies the process of creating, generating, and managing NestJS projects, modules, controllers, and other components.
• NestJS provides extensive support for unit testing and end-to-end testing through various testing utilities and frameworks, such as Jest and Supertest.
• It has a vibrant and active community that actively contributes to the framework’s development, provides support, and shares best practices through forums, GitHub repositories, and online tutorials.

How and where is NestJS used?

What are top NestJS instruments and tools?

• Nest CLI: The Nest Command Line Interface (CLI) is a powerful tool for generating and managing NestJS applications. It provides a convenient way to scaffold, build, and run your NestJS projects. The CLI allows you to generate modules, controllers, services, and more with just a few simple commands. It also provides features for testing, debugging, and deploying your applications. The Nest CLI has been actively maintained since its initial release in 2017 and is widely used by the NestJS community.
• TypeORM: TypeORM is a powerful Object-Relational Mapping (ORM) tool that is commonly used with NestJS. It provides a seamless integration between your NestJS application and your database, allowing you to easily define and work with database entities using TypeScript classes. TypeORM supports a variety of databases including MySQL, PostgreSQL, SQLite, and more. It has gained popularity in the NestJS ecosystem due to its simplicity, flexibility, and extensive feature set.
• Passport: Passport is a popular authentication middleware for Node.js that is often used with NestJS. It provides a simple and flexible way to authenticate requests using various strategies such as username/password, JWT, OAuth, and more. Passport has been around since 2010 and has a large and active community. It is widely used in production applications and has a proven track record of reliability and security.
• NestJS Swagger: NestJS Swagger is a module that automatically generates OpenAPI (formerly known as Swagger) documentation for your NestJS APIs. It provides a user-friendly interface for exploring and testing your API endpoints. NestJS Swagger integrates seamlessly with NestJS decorators, allowing you to annotate your controllers and methods with metadata that defines the structure and behavior of your API. It has gained popularity for its ability to streamline the API documentation process and improve developer productivity.
• Jest: Jest is a powerful JavaScript testing framework that is widely used in the Node.js and NestJS communities. It provides a simple and intuitive API for writing and running tests, with features such as test parallelization, code coverage analysis, and snapshot testing. Jest has gained popularity for its fast execution speed, built-in mocking capabilities, and comprehensive documentation. It is the default testing framework recommended by the NestJS team and is widely used for testing NestJS applications.
• NestJS Config: NestJS Config is a module that simplifies the management of configuration variables in NestJS applications. It allows you to define your application’s configuration in a structured manner using environment variables or configuration files. NestJS Config provides a convenient way to access configuration values throughout your application, with support for different configuration environments and easy integration with other NestJS modules. It has gained popularity for its simplicity and flexibility in managing application configurations.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.