I have worked with many Indian companies as an HR and few of them used to be IT companies. I have hired many full stack developers, and what I have learned during this period of time is that full stack developer is a guy who knows everything. We hired full stack developers mainly because:
1. Full stack developer helps you to keep every part of the system running smoothly
2. Full stack developer can provide help to everyone in the team and greatly reduce the time and technical costs of team communication
3. If one person plays different roles, it saves your company's personnel, infrastructure, and operational cost
When I investigated their CVs, I found the following skill sets:
1. Front-end technology: Full stack developer should be master of essential front-end technologies like HTML5, CSS3, JavaScript. Knowledge of third-party libraries like jQuery, LESS, Angular and React JS is desirable
2. Development Languages: Full stack engineer should know at least one server-side programming languages like Java, Python, Ruby, .Net etc.
3. Database and cache: Knowledge of various DBMS technology is another important need of full stack developer. MySQL, MongoDB, Oracle, SQLServer are widely used for this purpose. Knowledge of caching mechanisms like varnish, Memcached, Redis is a plus.
4. Basic design ability: To become a successful full stack developer, the knowledge of designing is also recommended. Moreover, the person should know the principle of basic prototype design and UI /UX design.
5. Server: Exposure to handling Apache or nginx servers is desirable. A good background in Linux helps tremendously in administering servers.
6. Version control system (VCS): A version control system allows full stack developers to keep track of all the changes made in the codebase. The knowledge of Git helps full stack developers to understand how to get the latest code, update parts of the code, make changes in other developer's code without breaking things.
7. Working with API (REST & SOAP): Knowledge of web services or API is also important for full stack developers. Knowledge of creations and consumption of REST and SOAP services is desirable.

Many of the full-stack developers that I hired in my company as an HR also were proficient in software stack. Software stack is a collection of the programs which are used together to produce a specific result. It includes an operating system and its application. For example, a smartphone software stack includes OS along with the phone app, web browsers, and default applications. Notable among them are as follows:
1. LAMP stack: LAMP is a widely used model for web service stacks. Its name "LAMP" is an acronym of four open-source components.
1. L= Linux: An open source operating system
2. A= Apache: Widely used web server software
3. M= MySQL: Popular open source database
4. P=PHP: Server-side open source scripting language
These above-discussed components, supporting one another. Many popular websites and web applications run on LAMP stack, Example: Facebook.
2. MERN stack: MERN is a collection of JavaScript-based technologies:
1. M=MongoDB: Popular NoSQL database
2. E=Express: Light and portable web program framework
3. R=React: A javascript library for building user interfaces
4. N=Node.js: A server-side JavaScript run time
This stack currently in the huge demand as it is widely used to develop web applications.
3. MEAN stack: MEAN Stack Application Development is witnessing a growing trend in usage. MEAN is an abbreviation of:
1. M = MongoDB: nosql Database
2. E = Express: Easy to use light and portable web program framework
3. A = Angular.js: Robust framework for developing HTML5 and JavaScript- web programs
4. N = Node.is: a server-side JavaScript run time
These were all or some of the jobs that a full-stack developer did in Indian IT companies:
1. Translate user requirements into the overall architecture and implementation of new systems
2. Manage Project and coordinate with the Client
3. Write backend code in Ruby, Python, Java, PHP languages
4. Writing optimized front end code HTML and JavaScript
5. Understand, create, and debug database related queries
6. Create test code to validate the application against client requirement.
7. Monitor the performance of web applications & infrastructure
8. Troubleshooting web application with a fast and accurate a resolution

Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath