Wells Fargo System Engineer Interview Questions and Answers

I have a strong background in software engineering and a passion for innovation, making me a valuable asset to HSBC.

• I have a proven track record of successfully delivering high-quality software solutions in previous roles.

• I am highly skilled in various programming languages and technologies, including Java, Python, and SQL.

• I have experience working in agile development environments, allowing me to adapt quickly to chan...read more

Markets offer dynamic and challenging environments that require constant adaptation and innovation.

• Markets provide opportunities for growth and expansion

• Competition in markets drives innovation and efficiency

• Markets offer diverse career paths and opportunities for personal development

Find an odd occurring number among even occurring numbers.

• Use XOR operation to cancel out even occurring numbers and get the odd occurring number.

• Iterate through the array and XOR each element with the result variable.

• The final result will be the odd occurring number.

Print the spiral order of a binary tree and matrix.

• For binary tree, use level order traversal and alternate direction for each level.

• For matrix, use four pointers to traverse in spiral order.

• Example for binary tree: 1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 -> 8 -> 9

• Example for matrix: 1 2 3 4 -> 8 7 6 5 -> 9 10 11 12 -> 16 15 14 13

Finding pairs in an array with a given sum.

• Iterate through the array and for each element, check if the difference between the given sum and the element exists in the array.

• Use a hash table to store the elements of the array and their indices for faster lookup.

• If there are multiple pairs with the same sum, return any one of them.

• If no pair is found, return null or an empty array.

Find total number of k element with given avg in an array in minimum time complexity.

• Use sliding window technique to traverse the array in O(n) time complexity.

• Maintain a sum variable to keep track of the sum of elements in the window.

• If the sum of elements in the window is equal to k times the given avg, increment the count.

• Move the window by subtracting the first element and adding the next element in the array.

Printing non-boundary elements of a binary tree

• Traverse the tree in any order (preorder, inorder, postorder)

• Check if the current node is not a boundary node (not the first or last node in its level)

• If it is not a boundary node, print its value

• Recursively traverse its left and right subtrees

Yes, I have coded in curriculum. The most complex one was a project on building a web application using React and Node.js.

• Built a full-stack web application using React and Node.js

• Implemented user authentication and authorization using JSON Web Tokens (JWT)

• Used MongoDB as the database and Mongoose as the ODM

• Implemented real-time updates using Socket.IO

• Deployed the application on Heroku

• Handled errors and implemented log

Big data refers to large and complex data sets that cannot be processed using traditional data processing methods.

• Big data is characterized by its volume, velocity, and variety

• It is used in various industries such as healthcare, finance, and retail

• Examples of big data include social media data, sensor data, and transactional data

• It is called 'big' because it involves processing massive amounts of data

• Big data requires ...read more

I am passionate about technology and eager to learn new skills in the IT sector.

• I have always had a keen interest in technology and enjoy working with computers.

• I believe the IT sector offers more opportunities for growth and advancement in my career.

• I have seen the impact of technology on various industries and want to be a part of that innovation.

• I have taken courses in programming and networking to prepare myself fo

To find the product of all data points using SelectSum(), log(), and exp() functions.

• Use the log() function to convert the product into a sum of logarithms

• Apply the SelectSum() function to calculate the sum of logarithms

• Finally, use the exp() function to convert the sum back into the product