Integration of user-facing elements developed by front-end developers with server-side logic
Writing reusable, testable, and efficient code
Design and implementation of low-latency, high-availability, and performant applications
Implementation of security and data protection
Integration of data storage solutions

Strong proficiency with JavaScript
Knowledge of Node.js and frameworks available for it such as Express, Sails.js, etc
Understanding the nature of asynchronous programming and its quirks and workarounds
Good understanding of server-side templating languages such as Jade, EJS, etc
Good understanding of server-side CSS preprocessors such as Stylus, Less and Scss
Good understanding of front-end technologies, such as HTML5, and CSS3
Understanding accessibility and security compliance
User authentication and authorization between multiple systems, servers, and environments
Integration of multiple data sources and databases into one system
Understanding fundamental design principles behind a scalable application
Understanding differences between multiple delivery platforms, such as mobile vs. desktop, and optimizing output to match the specific platform
Creating database schemas that represent and support business processes
Implementing automated testing platforms and unit tests
Proficient understanding of code versioning tools, such as Git

Senior Node.js / Express Developer

Key skills