FIS Principal Engineer Interview Questions and Answers

Use a hash set to remove duplicates in an array of strings

• Create a hash set to store unique elements

• Iterate through the array and add each element to the hash set

• Convert the hash set back to an array to get the unique elements

React virtual DOM is a lightweight copy of the actual DOM, used for efficient updates and rendering in React applications.

• Virtual DOM is a concept where a lightweight copy of the actual DOM is created in memory.

• React uses virtual DOM to efficiently update and render components without directly manipulating the actual DOM.

• When changes are made to the virtual DOM, React calculates the most efficient way to update the act...read more

React hooks are functions that let you use state and other React features without writing a class.

• React hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• useContext() is a hook that allows you to use the con...read more

OData create deep entity steps involve creating related entities in a single request.

• Use $expand query option to include related entities in the request.

• Specify the related entities in the request payload.

• Ensure proper navigation properties are set in the request payload.

• Example: POST /Orders?$expand=Customer,Products

• Example payload: { OrderID: 123, Customer: { CustomerID: 456, Name: 'John Doe' }, Products: [{ ProductI

Types of enhancements and user exits are customizations made to SAP systems to meet specific business requirements.

• Enhancements are modifications made to standard SAP programs to add new functionality or customize existing features.

• User exits are predefined exit points in SAP programs where custom code can be inserted to meet specific business requirements.

• Enhancements can be classified as implicit enhancements, explic...read more

One of the development challenges I faced was implementing a complex algorithm for real-time data processing.

• Understanding the algorithm requirements and constraints

• Optimizing the algorithm for efficiency and speed

• Testing the algorithm with large datasets to ensure accuracy

• Collaborating with team members to troubleshoot and debug any issues

Adobe forms development involves creating interactive forms using Adobe software. Dynamic enable/disable fields allow for conditional interactions.

• Adobe forms development involves using Adobe software like Adobe Acrobat or Adobe LiveCycle Designer.

• Steps include designing the form layout, adding form fields, setting up form logic, and testing the form.

• Dynamic enable/disable fields can be achieved using JavaScript to con...read more

The implementation model outlines the structure and process for executing a project or initiative.

• Define project goals and objectives

• Identify key stakeholders and their roles

• Develop a timeline and milestones

• Allocate resources and budget

• Establish communication channels

• Monitor progress and make adjustments as needed

Different stages and owners refer to the various phases of a project or initiative and the individuals or groups responsible for each stage.

• Different stages in a project may include planning, execution, monitoring, and evaluation.

• Owners of each stage could be project managers, team leads, stakeholders, or external consultants.

• Clear delineation of stages and owners helps ensure accountability and progress.

• For example, i...read more

By emphasizing the importance of data for successful implementation and ensuring confidentiality measures are in place.

• Highlight the critical role of data in achieving project goals

• Assure the client of strict confidentiality measures in place

• Explain how sharing sensitive data will lead to better outcomes

• Provide examples of successful implementations where data sharing was crucial