Fidelity Investments
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I applied via LinkedIn and was interviewed in Sep 2022. There were 4 interview rounds.
3 hacker rank questions easy to medium level asked to solve in 60 mins.
Design patterns in Java are reusable solutions to common software design problems.
Design patterns should be used when there is a recurring problem in software design.
Design patterns can improve code readability, maintainability, and scalability.
Examples of design patterns include Singleton, Factory, Observer, and Decorator.
It's important to choose the right design pattern for the specific problem at hand.
Design pattern...
Java 8 streams are functional programming constructs that allow for efficient processing of large data sets.
Streams are composed of a source, intermediate operations, and a terminal operation.
Intermediate operations include filter, map, and sorted, and are lazily evaluated.
Terminal operations trigger the evaluation of the stream and include forEach, reduce, and collect.
Streams can be parallelized for even greater perfo...
Fixed thread pool has a fixed number of threads while cached thread pool creates new threads as needed.
Fixed thread pool is suitable for tasks with a known number of threads
Cached thread pool is suitable for tasks with unknown number of threads
Fixed thread pool can cause resource wastage if the number of threads is too high
Cached thread pool can cause performance issues if the number of threads is too high
Example: Fixe...
Spring app config can be handled using various methods such as XML configuration, Java configuration, and annotation-based configuration.
XML configuration involves creating an XML file and defining beans and their dependencies.
Java configuration involves creating a Java class and using annotations to define beans and their dependencies.
Annotation-based configuration involves using annotations to define beans and their ...
Improving application performance requires optimizing code, database queries, and server resources.
Identify and fix slow database queries
Use caching to reduce server load
Optimize code by reducing unnecessary loops and improving algorithms
Use a content delivery network (CDN) to reduce server load
Upgrade server hardware or use cloud-based resources
Minimize HTTP requests and reduce file sizes for faster page load times
Microservices use various communication patterns like synchronous, asynchronous, event-driven, and message-based.
Synchronous communication involves direct request-response interactions between services.
Asynchronous communication uses messaging systems like RabbitMQ or Kafka to decouple services.
Event-driven communication involves services publishing events to a message broker, which other services can subscribe to.
Mess...
Using cache with Spring Boot
Add @EnableCaching annotation to main class
Add @Cacheable annotation to methods that need caching
Configure cache properties in application.properties file
Use CacheManager to manage caches
Example: @Cacheable(value = "users", key = "#id")
Async in Spring Boot allows non-blocking I/O operations, improving application performance.
Async enables parallel processing of requests, improving throughput.
It allows the application to handle more requests with the same resources.
It reduces the response time for long-running operations.
Use @Async annotation to mark methods as asynchronous.
Use CompletableFuture to handle async results.
Example: @Async public Completab...
Spring MVC follows the Model-View-Controller (MVC) pattern for building web applications.
Model represents the data and business logic
View renders the model data and provides user interface
Controller handles user requests, updates model and selects view
Spring MVC provides DispatcherServlet as front controller
RequestMapping annotation maps URL to controller method
ModelAndView object returns model data and view name
Filter is a method used to extract specific data from a larger set based on certain criteria.
Filter is required to extract specific data from a larger set.
It is used to reduce the amount of data that needs to be processed.
Filter can be applied to arrays, objects, and even strings.
Examples include filtering out all even numbers from an array or all emails from a list that contain a specific keyword.
OAuth2 is a protocol for authentication and authorization that allows third-party applications to access user data without sharing passwords.
OAuth2 provides a secure and standardized way for users to grant access to their resources to third-party applications.
It involves the exchange of tokens between the user, the third-party application, and the resource server.
Authentication is handled by the authorization server, w...
JWT is a token format while OAuth2 is a protocol. Both can be used to secure REST endpoints.
JWT is a self-contained token that contains user information and can be used for authentication and authorization.
OAuth2 is a protocol that allows third-party applications to access user data without sharing passwords.
To secure REST endpoints, both JWT and OAuth2 can be used depending on the use case.
For example, JWT can be used...
I applied via Campus Placement and was interviewed in Sep 2024. There were 3 interview rounds.
Array and string coding
I want to join Fidelity because of its reputation for innovation and commitment to employee development.
Fidelity is known for its cutting-edge technology and forward-thinking approach
I am impressed by Fidelity's focus on continuous learning and career growth opportunities
I believe Fidelity's values align with my own, particularly in terms of integrity and excellence
During a group project, I had a conflict with a team member over the direction of our presentation.
Team member wanted to focus on one aspect while I wanted to highlight another
We discussed our viewpoints and compromised on a balanced approach
Resulted in a successful presentation that covered all important aspects
I applied via Company Website and was interviewed in Mar 2024. There were 4 interview rounds.
Iterate through each character in the array of strings and keep track of the frequency of each character. Return the character with the maximum frequency.
Create a dictionary to store the frequency of each character
Iterate through each string in the array and then through each character in the string
Update the frequency count of each character in the dictionary
Return the character with the maximum frequency
Yes, I have experience with Junit, SQL and NoSQL databases, Kafka, Dockerization, Java 8 features, stream() operations, and shell scripting in Unix.
I have used Junit for unit testing in Java projects.
SQL databases are relational databases that use structured query language for data manipulation, while NoSQL databases are non-relational databases that provide flexible schema design and horizontal scalability.
I have work...
The most complex SQL query involved nested queries for data manipulation. Used inner join. Implemented hashset and avoided trees due to their drawbacks.
Nested SQL query used for complex data manipulation
Inner join used for combining data from multiple tables
Implemented hashset for efficient data storage and retrieval
Avoided trees due to their drawbacks such as unbalanced structure and slower traversal times
Shell scripting for find and replace, adding index to lines, multithreading, hashmap vs hashtable, stack vs queue
Use sed command for find and replace in shell scripting
Use awk command to add an index at the beginning of each line in a file
Multithreading is the ability of a CPU to execute multiple threads concurrently
Single threaded means only one thread is executed at a time, while multithreaded allows multiple threads...
I applied via Referral and was interviewed in Jul 2024. There were 3 interview rounds.
My last project involved implementing a monitoring system for a large-scale e-commerce platform.
Designed and implemented a custom monitoring solution using Prometheus and Grafana
Integrated alerting mechanisms to notify on-call engineers of critical issues
Optimized monitoring queries and dashboards for performance and usability
Fidelity Investments interview questions for popular designations
Get interview-ready with Top Fidelity Investments Interview Questions
posted on 29 Nov 2024
General aptitude and English questions.
Machine Learning is a branch of artificial intelligence that involves developing algorithms and models that allow computers to learn from and make predictions or decisions based on data.
Machine Learning involves training algorithms to learn patterns from data and make predictions or decisions without being explicitly programmed.
It is used in various applications such as recommendation systems, image recognition, natura...
React Js is a JavaScript library for building user interfaces.
React Js is developed and maintained by Facebook.
It allows developers to create reusable UI components.
React uses a virtual DOM for better performance.
React can be used for building single-page applications.
Transactions in microservices are managed using distributed transactions or compensating transactions.
Distributed transactions involve multiple microservices coordinating with a transaction manager to ensure data consistency across services.
Compensating transactions involve each microservice having a compensating action to rollback changes if a transaction fails.
Saga pattern is commonly used in microservices to manage ...
I applied via Naukri.com and was interviewed in Nov 2024. There were 2 interview rounds.
General aptitude logical , reasoning
DSA Algorithm, SQL queries and some scenario based questions.
Multiple join clauses in SQL allow for joining multiple tables based on different conditions.
Multiple join clauses can be used to join more than two tables in a single query.
Each join clause specifies the relationship between two tables using keys or columns.
Different types of joins like INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN can be used in multiple join clauses.
I applied via Approached by Company and was interviewed in Jul 2024. There was 1 interview round.
Managed various projects in previous companies ranging from software development to marketing campaigns.
Led a team in developing a new mobile app for increasing customer engagement
Managed a marketing campaign for a new product launch, resulting in a 20% increase in sales
Implemented a new CRM system to streamline customer interactions and improve efficiency
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The duration of Fidelity Investments interview process can vary, but typically it takes about less than 2 weeks to complete.
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