Top Programming Interview Questions For Remitly

At Remitly, we believe in the power of technology to make a global impact. We are looking for ambitious and creative problem solvers to join our fast-growing team. We are currently looking for a talented Full Stack Engineer who will join our mission of enabling customers to send money around the world quickly, securely and conveniently. As a Full Stack Engineer at Remitly, you will play a critical role in the development of our platform. You will be part of a cross-functional team that is responsible for building and maintaining our products, including web and mobile applications. You will be exposed to a wide range of technologies, from client-side development to server-side APIs, and will be expected to be able to move quickly between them. Your primary responsibilities will include developing, testing and deploying new features on our platform, as well as ensuring high availability and scalability of our systems. You will be responsible for designing and coding solutions to complex problems, as well as providing technical support to our customers. You will also be responsible for developing automated tests to ensure quality and reliability of our products. You should have experience with a variety of web technologies, including HTML, CSS, JavaScript and frameworks such as React and Angular. You should also have experience with server-side languages such as Node.js and Python, as well as experience with database technologies such as PostgreSQL, MongoDB, and Redis. You should also have a good understanding of distributed systems and microservices architecture. At Remitly, we are passionate about creating a diverse, equitable and inclusive workplace. We strive to foster an environment where everyone can do their best work, regardless of their background. We encourage candidates from all backgrounds to apply. We are looking for a Full Stack Engineer who is passionate about technology, loves solving complex problems and is excited about the opportunity to make a global impact. If this sounds like you, we look forward to hearing from you.

1. Optimizing an existing web application for better performance Optimizing an existing web application for better performance is a great way to ensure that users have a positive experience. Through careful analysis of current performance, we can identify areas of improvement and develop strategies to increase speed, reduce latency, and improve scalability. With the right strategies, we can make a web application faster, more reliable, and more user-friendly. 2. Creating a system to track and report website performance metrics Creating a system to track and report website performance metrics is essential for businesses to gain insights into their website performance. With this system, businesses can monitor user engagement, page load times, page views, and other key metrics. This data can then be used to make informed decisions about website design and content strategies. The system will help businesses maximize their website performance and better understand their customers. 3. Creating a system to process and analyze user data Creating a system to process and analyze user data is a powerful tool for businesses looking to gain valuable insights from their customers. The system can collect, compile, and analyze data from multiple sources to help organizations better understand user behavior. It can help identify trends, measure customer loyalty, and inform decision-making. By utilizing this system, businesses can stay competitive and gain a competitive edge. 4. Implementing an API to allow cross-platform data sharing Implementing an API is a great way to enable cross-platform data sharing and integration. It allows different systems to communicate seamlessly and securely, making data access and sharing easier than ever before. The API provides a stable and secure connection, ensuring data privacy and security. With a few lines of code, powerful applications can be created which enable data sharing across multiple platforms. 5. Building an automated system to monitor system performance Building an automated system to monitor system performance is a great way to keep track of the performance of your system in real-time. This system can detect and alert you to any potential problems and help you take proactive steps to ensure optimal performance. By monitoring system performance, you can quickly identify and address any issues that may arise. 6. Developing a system for automated performance monitoring and optimization Developing an automated performance monitoring and optimization system is critical for businesses of all sizes. This system will enable businesses to monitor performance and make adjustments to optimize their processes, improve efficiency, and increase profits. It will also enable businesses to track customer satisfaction and identify areas for improvement. With this system, businesses will be able to better understand their customers and respond quickly to changing customer needs. 7. Designing an AI-powered system for automated customer service Designing an AI-powered system for automated customer service is an exciting and challenging task. It requires a deep understanding of customer needs and preferences, a mastery of AI technologies, and a commitment to providing exceptional customer service. Our AI-powered system will be able to understand customer queries, provide accurate answers, and suggest the best solutions. It will learn from customer interactions and develop sophisticated algorithms to improve its performance over time. With our AI-powered system, customers will enjoy a faster, more accurate, and more personalized customer service experience. 8. Designing a content management system Designing a content management system (CMS) is an important task for any organization. It allows users to easily create, store, manage and publish content such as text, media, and code. Content can be optimized for different devices, platforms and audiences. A CMS also offers tools for collaboration and workflow, making it easier to manage complex content projects. With a robust CMS, organizations can create and manage content with ease. 9. Building a fully-functional mobile application Building a fully-functional mobile application can be an exciting and rewarding experience. With the right planning, development, and testing, you can create an app that looks great and performs optimally. You can use a variety of tools, such as programming languages, frameworks, and databases, to create an app that meets your needs. With your app, you can provide customers with a valuable and unique experience. Let's get started! 10. Designing a system to support automated security checks Designing a system to support automated security checks requires careful planning. It should be built with scalability and flexibility in mind, enabling it to adapt to changing requirements over time. The system should be capable of integrating multiple data sources, including both internal and external sources. Additionally, it should provide a secure environment for storing and sharing information, as well as automated processes for monitoring and analyzing data. 11. Building a distributed system for data storage and analysis Building a distributed system for data storage and analysis is an exciting opportunity to improve the speed, scalability, and reliability of data storage and analysis. This system provides secure access to data in the cloud, improved data processing and analysis, and data sharing across multiple platforms. It also offers enhanced data security, advanced analytics, and fast data access. With this system, businesses can gain powerful insights from their data. 12. Developing a system for user account management and security Developing a system for user account management and security is essential for any business. It ensures that user data is protected and secure, while allowing administrators to easily manage user accounts. The system should include features such as multi-factor authentication and access control, secure data storage and encryption, and user activity logging. Additionally, it should provide an intuitive user interface that allows users to easily manage their accounts. 13. Optimizing an existing database for better performance Optimizing an existing database for better performance is an important step to ensure smooth operations. It involves an assessment of the database structure, identifying areas for improvement, and implementing changes to improve speed, scalability, and reliability. By optimizing the database, we can reduce costs, minimize downtime, and achieve smoother operations. 14. Integrating a third-party API into a mobile application Integrating a third-party API into a mobile application can open up a host of possibilities for businesses. With the right expertise, businesses can leverage the latest technologies and build powerful, feature-rich applications that deliver a highly engaging user experience. By integrating a third-party API, businesses can access new data sources, create custom features, and provide users with a seamless experience. The possibilities are endless. 15. Creating a secure and reliable data storage system Creating a secure and reliable data storage system is key to protecting sensitive information. It requires careful planning, implementation, and maintenance to ensure data is safe and accessible when needed. Security measures must be taken to protect data from unauthorized access, while ensuring the system's reliability and performance. Advanced encryption techniques, secure authentication, and reliable backups should be employed to protect data. The system should also be regularly tested to ensure it is functioning properly. With the right setup, a secure and reliable data storage system can be established. 16. Integrating a payment gateway into the application Integrating a payment gateway into your application can help streamline the payment process. It offers secure and reliable payments, with a range of features like custom checkout, recurring payments and more. With this integration, customers can make payments easily, quickly and securely, giving them a better overall experience. 17. Developing a system to monitor user activity on a website We are developing a system to monitor user activity on our website. This system will help us gain valuable insights into user behavior, identify patterns, and improve our website to better meet the needs of our users. The system will track user interactions with the website, such as page visits, clicks, and time spent on pages. We will use this data to improve user experience, optimize our website, and identify areas for further development. 18. Optimizing a web application for improved speed and performance Optimizing a web application for improved speed and performance is an important part of ensuring a positive user experience. By taking steps such as minifying code, leveraging caching, reducing render-blocking resources and compressing images, webpages can be made to load faster, reducing latency and increasing performance. Additionally, optimization techniques such as server-side rendering, code splitting and prefetching can provide extra benefits. All of these methods can help make a web application faster and more responsive. 19. Developing a system to support user segmentation Developing a system to support user segmentation is a powerful tool to understand users and their needs. It can help identify user groups, segment customers, and develop targeted strategies. It is an excellent way to improve user experience, boost engagement, and increase customer satisfaction. With the right system, businesses can leverage data to develop meaningful insights to drive success. 20. Designing a system to automate data backups Designing a system to automate data backups is essential to ensure the safety and security of important business information. It involves creating a comprehensive plan to create regular backups, determine the best backup strategy, and store the backups securely. The system should also be able to detect any potential problems and provide notifications to alert IT personnel of any issues. This will ensure data is always backed up in an efficient and secure manner. 21. Creating a system to support user-generated content Creating a system to support user-generated content is essential for enabling users to share their ideas and experiences. It involves setting up a platform for users to submit content, creating user accounts, managing content, and creating rules for user interactions. The system should be secure and efficient, with features like moderation and data protection. It should also be easy to use and intuitive, so users can quickly create and share content. 22. Developing a system for capturing user feedback Developing a system for capturing user feedback is an important step in improving customer service. This system will allow users to provide accurate and timely feedback on products and services, enabling businesses to quickly address any issues. The system will include a feedback form, user surveys, and various other methods to ensure that user feedback is collected and acted upon. 23. Building an application to support real-time streaming of data Building an application to support real-time streaming of data is an exciting project. It provides the opportunity to deliver data quickly and reliably, enabling users to access data as soon as it is available. This application can be used to build data pipelines, improve communication and collaboration, and create powerful analytics and insights. By leveraging the latest technologies, this application can be designed to scale with the needs of the business. 24. Developing a distributed system to support real-time data processing We are developing a distributed system to support real-time data processing. Our system will use a combination of modern technologies and algorithms to ensure scalability, reliability, and speed. Our distributed system will allow data to be collected, processed, and analyzed in real-time, enabling businesses to make faster, more informed decisions. Additionally, our system will be designed to be secure, ensuring data privacy and security. We are committed to creating a system that is flexible and robust, able to handle large volumes of data. 25. Building a custom analytics dashboard for a website Building a custom analytics dashboard for a website is a great way to gain insights into user behavior and website performance. With a custom dashboard, you can easily track website visits, page views, clicks, and other key metrics. You can also create custom reports, set up automated alerts, and even create interactive visualizations. Dashboard building is an essential part of any website's success and should be a priority for any business. 26. Heap Queue or heapq in Python Heap Queue (heapq) is a Python module that provides an efficient implementation of a priority queue data structure. It allows for efficient insertion and retrieval of elements based on their priority, making it ideal for applications such as scheduling, task management, and data processing. Heap queues are based on the heap data structure, which is a partially sorted binary tree. Heapq allows users to easily manage priority queues with the familiar Python syntax. 27. How to Open JSON File Do you need help understanding how to open a JSON file? This guide will provide you with the basics of JSON files and how to open them. JSON is a JavaScript-based data format used to store and exchange data. It is a great way to work with data, as it is easy to read and understand. To open a JSON file, you will need a text editor or a compatible program. Once opened, you can view the information in the file. 28. MD5 Hash in Python MD5 Hash is a popular cryptographic hash function in Python. It generates a fixed-size 128-bit hash value from a given data of any size. It is widely used in security applications to verify data integrity and detect accidental or malicious data corruption. It is also used for generating checksums for secure password storage. 29. String Comparison in Python String comparison in Python is a fundamental aspect of scripting and programming. It allows for the evaluation of two strings to determine if they are equal, or if one string is greater or less than the other. Comparisons are done using relational operators like ==, !=, >, <,>=, or <=. python="" also="" provides="" functions="" like="" str.startswith()="" and="" str.endswith()="" to="" check="" for="" a="" particular="" substring.="" 30.="" How to Install Pip in MacOS Installing Pip on MacOS is a simple process that can be completed in a few easy steps. Pip is a python package manager that allows you to easily download and install packages from the Python Package Index. This tutorial will walk you through the process of installing Pip on MacOS. You will need a Mac with an active internet connection. Afterward, you can start installing packages with Pip. 31. Double Tree Double Tree is a hotel chain that specializes in providing exceptional hospitality experiences. From cozy guest rooms with signature ‘sweet dreams’ beds to delicious, freshly-baked chocolate chip cookies, Double Tree creates a welcoming environment for its guests. Enjoy amenities like free high-speed wifi, in-room dining, fitness centers, and swimming pools. Relax and unwind with quality hospitality and warm service at any Double Tree location! 32. Set in Java Set is a powerful data structure in Java that stores unique values. It is an interface that extends Collection, which allows for creating unordered collections of objects that contain no duplicate elements. It provides methods such as add(), remove(), contains() and size() to manipulate the data stored. Set also offers different implementations such as HashSet, TreeSet and LinkedHashSet. 33. List Interface in Java with Examples The List Interface in Java is a powerful tool for creating and managing collections of objects. It provides a number of methods to access, modify, and manipulate the elements of the list. Examples of lists include ArrayList, LinkedList, Vector, and Stack. These are all useful for creating and storing data in an ordered, efficient manner. 34. JavaScript match() Function The JavaScript match() Function is a powerful tool for finding patterns in strings. It is used to search for a specified pattern in a string and returns an array of matches. It can be used to search for a specific word, text, or number, or even a combination of characters. It is an important part of string manipulation and is used extensively in web development. 35. Difference Between Router and Switch Routers and Switches are both essential components of a computer network. They both connect computers, printers, and other devices together to enable data transmission. Routers are responsible for routing data packets between different networks, while switches control the flow of data within a single network. Routers are more complex than switches, as they use more advanced logic to manage network traffic. Switches are simpler and can only forward data within a single network. 36. Matplotlib Pyplot scatter in Python Matplotlib Pyplot scatter is a powerful plotting library in Python used to create beautiful data visualizations. It enables us to create scatter plots with ease, which are useful for plotting correlations between two variables. Pyplot scatter has many features and customization options, making it a great choice for data exploration, data analysis, and data communication. 37. Population Mean Formula Population mean formula is a statistical tool used to measure the average value of a population. It is calculated by taking the sum of all values in the population and dividing it by the total number of values. This formula can be used to assess the overall health and trends of a given population. It is a useful tool when looking at large datasets and provides valuable information to decision makers. 38. StringBuilder Class in Java With Examples The StringBuilder class in Java is a mutable sequence of characters. It provides an efficient way to concatenate strings, insert data into strings, and delete characters from strings. It is used when more control over the creation of strings is required. Examples include manipulating strings, creating substrings, and inserting values into strings. StringBuilder is fast and can be manipulated easily with methods such as append(), insert(), delete(), and replace(). 39. Python Initialize Empty Array of Given Length This is an introduction to Python and how to initialize an empty array of a given length. Python is a powerful, high-level programming language used in a variety of applications. It offers a simple syntax, dynamic typing, and rapid development capabilities. By initializing an empty array, you can create an array of a specified length without having to specify the elements. This is useful for setting up a data structure without having to enter data. 40. Read, Write and Parse JSON Using Python Python is a powerful language that makes working with JSON data easy. With its built-in read, write, and parse functions, Python provides an easy way to read and write JSON data as well as parse it into meaningful data structures. It also allows for data validation and transformation to ensure the data is properly formatted. With Python, you can quickly and easily create and manage your JSON data.