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Alexandra, Front-End Developer

Last Updated: 23 Oct 2023

- Enthusiastic and motivated front-end developer with a Bachelor's degree in Computer Science from Belarusian State University of Informatics and Radioelectronics. - Proficient in Angular, JavaScript, TypeScript, HTML, CSS, and RxJs. - Experienced in developing single-page applications (SPA) and creating complex UI designs. - Skilled in troubleshooting and resolving issues of any complexity. - Strong knowledge of software development methodologies, principles, and patterns. - Familiar with REST API, GraphQL, and various development tools such as Git, GitLab, and Visual Studio Code. - Successfully redesigned UIs for improved user experience and optimized applications for maximum speed and scalability.

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Warsaw, Poland
Last Updated: 17 Jan 2024

Software Engineer with 5+ years of extensive experience in front-end development, offering a strong foundation in software engineering and programming principles across multiple platforms. Expertise in JavaScript and TypeScript with a complete command of Angular and related technologies like RxJS, NGRX, and Angular Material. Holds a track record of leading small teams and successfully managing full software development lifecycle for various projects. Demonstrated ability to optimize application performance, manage CI/CD pipelines, and integrate analytic tools to enhance user experience. Technical acumen accentuated by hands-on experience with industry-standard tools such as Git, Jira, and Azure DevOps. Known for excellent problem-solving skills and ability to handle complex development tasks, bringing value to any team through a diligent work ethic, collaborative approach, and forward-thinking mindset.

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JavaScript   6 yr.


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Minsk, Belarus
Last Updated: 4 Jul 2023

4+ years of web development experience with Angular, NodeJS, JavaScript, Full stack web developer in full application development life cycle including requirement analysis, designing, coding, deploying and debugging.

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JavaScript   6 yr.


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Last Updated: 4 Jul 2023

- Frontend developer (Angular) at ITHoot. Before that, I worked as a freelancer for 1 year. - During my work, I mastered Html, Css, Scss, Gulp, JavaScript, Git, Angular2 - Pre-Intermediate English. - Available: ASAP

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JavaScript   3 yr.



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Yevhenii K., Front-end Developer

Last Updated: 5 Sep 2023

- Self-motivated and result-driven front-end developer with 5+ years of experience - Skilled in Angular and JavaScript, with extensive experience in their development and ecosystem - Strong ability to write clean code, debug performance issues, and implement features based on client and user needs - Possesses good logical thinking and a high level of responsibility - Excellent attention to detail and ability to work well in a team - Proficient in various programming languages and technologies such as JavaScript, TypeScript, HTML, CSS, SASS, Angular 2+, npm, Webpack, Redux, Rest API, RWD, Figma, Bootstrap, rxJS, docker, ionic, firebase, and JWT - Experienced in working with databases like MongoDB and MySQL, and familiar with source controls like GIT and tracking systems like Jira and Trello. - Intermediate English - Availability starting from ASAP

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Table of Contents

Pros & cons of RxJs

9 Pros of RxJs

  • Efficient and Scalable: RxJs provides a highly efficient and scalable way to handle asynchronous operations. Its reactive programming model allows for efficient event handling and data flow management.
  • Declarative Programming: RxJs promotes a declarative programming style, where you define what you want to achieve rather than focusing on how to achieve it. This leads to cleaner and more maintainable code.
  • Composition: RxJs offers powerful composition operators that allow you to combine and transform streams of data easily. This enables you to build complex data pipelines with minimal effort.
  • Event-driven Architecture: RxJs is well-suited for event-driven architectures, where events are the primary means of communication between components. It provides a unified way to handle and react to events from various sources.
  • Reactive Extensions: RxJs is part of the larger family of Reactive Extensions (Rx), which is available in many programming languages. This means that developers familiar with RxJs can apply their knowledge to other Rx implementations.
  • Wide Range of Operators: RxJs comes with a rich set of operators that cover a wide range of use cases. These operators provide powerful functionality for filtering, transforming, combining, and manipulating data streams.
  • Hot and Cold Observables: RxJs supports both hot and cold observables. Hot observables continue to emit values regardless of whether there are active subscribers, while cold observables only emit values when there are subscribers. This flexibility allows for more control over the behavior of observables.
  • Backpressure Handling: RxJs provides mechanisms for handling backpressure, which is important when dealing with asynchronous operations that can produce data faster than it can be consumed. This ensures that the system remains stable and prevents resource exhaustion.
  • Community and Ecosystem: RxJs has a vibrant community and a growing ecosystem of libraries and tools built around it. This means that developers can leverage existing resources and find support when working with RxJs.

9 Cons of RxJs

  • Learning Curve: RxJs introduces a new programming paradigm and can have a steep learning curve, especially for developers who are not familiar with reactive programming concepts.
  • Complexity: Due to its powerful and flexible nature, RxJs can lead to complex code if not used properly. It requires careful planning and design to ensure that the code remains readable and maintainable.
  • Debugging: Debugging RxJs code can be challenging, as it involves working with asynchronous streams of data. Tools and techniques specific to RxJs may be required to effectively debug issues.
  • Performance Overhead: While RxJs provides efficient handling of asynchronous operations, it does introduce some performance overhead compared to traditional imperative programming approaches. This overhead is generally acceptable for most applications but may be a concern for performance-critical scenarios.
  • Memory Management: RxJs introduces new concepts like subscriptions and observers, which need to be managed properly to avoid memory leaks. Improper management of subscriptions can lead to memory leaks and degrade the performance of the application.
  • Compatibility: RxJs may not be compatible with all existing codebases and libraries. Integration with legacy systems or frameworks that do not support reactive programming may require additional effort and workarounds.
  • Tooling Support: While the ecosystem around RxJs is growing, tooling support (e.g., IDE plugins, debugging tools) may not be as extensive as for more established programming paradigms. However, this is improving over time.
  • Conceptual Shift: Reactive programming requires a shift in mindset compared to traditional imperative programming. Developers coming from imperative programming backgrounds may initially find it challenging to think in reactive terms and design their applications accordingly.
  • Overuse: As with any powerful tool, there is a risk of overusing RxJs. Not all problems require a reactive approach, and using RxJs unnecessarily can add unnecessary complexity to the codebase.

Soft skills of a RxJs Developer

Soft skills are essential for any developer, especially for a RxJs Developer who works with reactive programming. These skills go beyond technical expertise and contribute to effective collaboration, problem-solving, and communication within a development team. Here are the soft skills required at different levels of experience for a RxJs Developer:


  • Active Listening: Ability to actively listen and understand requirements, issues, and feedback from team members, stakeholders, and end-users.
  • Adaptability: Willingness to adapt to changing project requirements, technologies, and work environments.
  • Attention to Detail: Being meticulous and paying close attention to details while writing code, debugging, and testing.
  • Collaboration: Working effectively as a team member, sharing ideas, and contributing to the success of the project.
  • Time Management: Efficiently managing time and prioritizing tasks to meet deadlines.


  • Problem-solving: Demonstrating strong analytical and problem-solving skills to identify and resolve complex issues.
  • Leadership: Ability to take ownership of tasks, guide junior team members, and support the team in achieving project goals.
  • Effective Communication: Communicating ideas, updates, and challenges clearly and concisely to team members and stakeholders.
  • Flexibility: Being adaptable and open to new approaches, technologies, and methodologies.
  • Mentoring: Assisting junior developers in their learning process, providing guidance, and sharing knowledge.
  • Conflict Resolution: Resolving conflicts within the team and fostering a positive and collaborative work environment.
  • Attention to Quality: Ensuring code quality, following best practices, and striving for continuous improvement.


  • Strategic Thinking: Taking a holistic view of the project, aligning development efforts with business goals, and making informed decisions.
  • Project Management: Managing project timelines, resources, and deliverables while coordinating with other teams and stakeholders.
  • Innovation: Identifying opportunities for innovation and suggesting improvements to existing workflows and processes.
  • Team Building: Building and nurturing a high-performing team, fostering collaboration, and mentoring junior developers.
  • Client Management: Effectively managing client expectations, providing regular updates, and addressing concerns.
  • Conflict Resolution: Resolving conflicts within the team and facilitating constructive discussions.
  • Decision-making: Making informed decisions based on technical expertise, business requirements, and project constraints.
  • Empathy: Understanding and considering the perspectives and needs of team members, stakeholders, and end-users.

Expert/Team Lead

  • Strategic Leadership: Providing strategic direction, setting goals, and driving the success of the team and projects.
  • Technical Mentoring: Mentoring and guiding developers at all levels, sharing deep knowledge of RxJs and reactive programming.
  • Influencing Skills: Convincing stakeholders, team members, and clients to adopt best practices and innovative approaches.
  • Conflict Resolution: Resolving conflicts within the team and facilitating collaborative solutions.
  • Decision-making: Making critical decisions considering technical, business, and organizational aspects.
  • Continuous Learning: Staying updated with the latest trends, technologies, and advancements in RxJs and related areas.
  • Effective Communication: Communicating complex technical concepts to both technical and non-technical stakeholders.
  • Strategic Planning: Developing long-term plans, roadmaps, and strategies to achieve business objectives.
  • Quality Assurance: Ensuring high-quality code, implementing code reviews, and promoting best practices.
  • Team Management: Managing team dynamics, fostering a positive work culture, and nurturing talent.
  • Client Relationship Management: Building and maintaining strong relationships with clients, understanding their needs, and delivering value.

What are top RxJs instruments and tools?

  • RxJS Marble Testing: RxJS Marble Testing is a powerful tool for testing reactive code written with RxJS. It allows developers to write tests in a declarative way using marble diagrams, which represent the observable sequences and their transformations over time. This tool provides a simple and intuitive syntax for testing asynchronous code, making it easier to write comprehensive tests for RxJS-based applications. It has been widely adopted by developers to ensure the correctness and reliability of their reactive code.
  • rxjs-spy: rxjs-spy is a debugging tool for RxJS that provides insights into the behavior of observables and operators. It allows developers to visualize the flow of data through observable streams, track the execution of operators, and monitor the performance of reactive code. This tool has been instrumental in diagnosing and fixing issues related to observables and operators, making it an invaluable asset for RxJS developers.
  • RxJS DevTools: RxJS DevTools is a browser extension that enhances the debugging experience for RxJS-based applications. It integrates with popular browser developer tools, such as Chrome DevTools and Firefox Developer Tools, to provide a dedicated panel for inspecting and debugging RxJS observables. With RxJS DevTools, developers can visualize the creation, subscription, and emission of observables, inspect their values over time, and track the execution of operators. This tool has gained significant popularity among RxJS developers for its ability to streamline the debugging process and improve overall productivity.
  • RxJS Testing Utilities: RxJS Testing Utilities is a collection of tools and functions designed to facilitate testing of RxJS-based applications. It provides utilities for creating test schedulers, mocking time-dependent behavior, simulating user interactions, and asserting the behavior of observables. These testing utilities have been widely adopted by developers to write comprehensive unit tests for their RxJS code, ensuring its correctness and maintainability.
  • RxJS Playground: RxJS Playground is an online interactive tool that allows developers to experiment with RxJS without the need to set up a local development environment. It provides a code editor, a visualizer, and an execution environment, enabling developers to write and execute RxJS code in real-time. The RxJS Playground has been widely used by developers to learn RxJS, prototype reactive solutions, and share code snippets with the community.
  • RxJS Watch: RxJS Watch is a utility library that simplifies the process of subscribing to observables and handling their updates. It provides a concise syntax for subscribing to observables and automatically cleaning up subscriptions when they are no longer needed. This tool has gained popularity among RxJS developers for its ability to reduce boilerplate code and improve code readability.
  • RxJS Logger: RxJS Logger is a logging utility for RxJS that captures and logs the execution of observables, operators, and subscriptions. It provides a detailed log of the events and values emitted by observables, allowing developers to understand the behavior of their reactive code. This tool has been widely used for debugging and troubleshooting RxJS code, as it provides valuable insights into the flow of data through observables.

Hard skills of a RxJs Developer

A RxJs Developer is skilled in reactive programming using RxJs library, which is widely used in JavaScript applications for handling asynchronous events and data streams.


  • Basic understanding of reactive programming concepts.
  • Ability to work with observables and operators provided by RxJs.
  • Familiarity with common RxJs operators like map, filter, and reduce.
  • Knowledge of handling errors and managing subscriptions in RxJs.
  • Basic understanding of subjects and multicasting in RxJs.


  • Proficiency in using advanced RxJs operators like mergeMap, switchMap, and concatMap.
  • Ability to handle complex asynchronous scenarios using RxJs.
  • Experience in using subjects to create custom observers and multicasting.
  • Knowledge of error handling strategies and best practices in RxJs.
  • Familiarity with testing RxJs code using frameworks like Jasmine or Jest.
  • Understanding of hot and cold observables and their differences.
  • Ability to optimize RxJs code for performance and memory management.


  • Deep understanding of the inner workings of RxJs and its core concepts.
  • Proficiency in creating custom operators and extending RxJs functionality.
  • Experience in architecting complex reactive systems using RxJs.
  • Ability to mentor and guide junior developers in using RxJs effectively.
  • Knowledge of advanced error handling techniques and strategies in RxJs.
  • Expertise in optimizing and fine-tuning RxJs code for performance.
  • Understanding of backpressure and strategies to handle it in RxJs.
  • Experience in debugging and troubleshooting complex RxJs applications.

Expert/Team Lead

  • Mastery in using all RxJs operators and techniques to solve complex problems.
  • Ability to design and implement reactive architectures at scale.
  • Experience in leading teams and driving RxJs best practices across the organization.
  • Expertise in performance optimization and memory management in RxJs.
  • In-depth knowledge of reactive frameworks and libraries beyond RxJs.
  • Strong problem-solving skills and ability to analyze and resolve complex issues.
  • Experience in contributing to the RxJs open-source community.
  • Ability to provide technical leadership and guidance in reactive programming.
  • Knowledge of reactive UI frameworks like Angular or React.
  • Experience in integrating RxJs with other technologies and platforms.
  • Understanding of reactive system design principles and patterns.

How and where is RxJs used?

TOP 9 Interesting Utilization Cases of RxJs Development

Case NameCase Description
1. Real-time Data StreamingRxJs is widely used for real-time data streaming applications. It provides a powerful set of tools for handling and processing streams of data in a reactive manner. This is particularly useful in scenarios where data is continuously updated and needs to be processed and displayed in real-time, such as real-time analytics dashboards, stock market tickers, or chat applications.
2. Event Handling and User InteractionsRxJs enables developers to easily handle and manage complex event-driven architectures. By leveraging observables and operators, developers can handle user interactions, such as button clicks, mouse movements, and keyboard inputs, in a more reactive and declarative manner. This makes it easier to manage and compose complex event flows and handle asynchronous operations.
3. Asynchronous Data FetchingRxJs provides powerful abstractions for handling asynchronous operations, such as making HTTP requests or querying databases. By using observables and operators, developers can easily compose and manage asynchronous data fetching operations, handle errors, and perform advanced data transformations. This is particularly useful in web applications where asynchronous data fetching is a common requirement.
4. State Management in Angular ApplicationsRxJs plays a crucial role in state management within Angular applications. With tools like NgRx, developers can leverage the power of RxJs to manage the state of their applications in a reactive and predictable manner. By using observables and reducers, developers can easily handle state updates, perform side effects, and manage complex application states.
5. Reactive Forms and Form ValidationRxJs is extensively used in form handling and validation scenarios. By leveraging observables and operators, developers can create reactive forms that automatically update and validate form inputs as users interact with them. This allows for a more interactive and responsive form experience, reducing the need for manual form handling and validation logic.
6. WebSocket CommunicationRxJs provides seamless integration with WebSocket communication. Developers can use observables to handle WebSocket events and messages, making it easier to manage bidirectional real-time communication between the client and server. This is particularly useful in applications that require real-time updates and collaboration, such as chat applications or collaborative editing tools.
7. Caching and MemoizationRxJs can be utilized for implementing caching and memoization techniques. By caching and memoizing the results of expensive operations using observables and operators, developers can optimize performance and reduce unnecessary computations. This is particularly beneficial in scenarios where the same operation is repeated frequently, such as computing complex calculations or fetching data from external sources.
8. Animation and Visual EffectsRxJs can be employed to create smooth animations and visual effects in web applications. By utilizing observables and operators, developers can create reactive animation sequences that respond to user interactions or time-based events. This enables the creation of engaging and interactive user interfaces with fluid transitions and effects.
9. Testing and MockingRxJs provides powerful tools for testing and mocking asynchronous operations. By using test schedulers and operators, developers can easily simulate time-based events and control the execution of asynchronous code during unit testing. This allows for more reliable and deterministic testing of code that relies on asynchronous operations, ensuring the correctness and stability of applications.

TOP 11 Tech facts and history of creation and versions about RxJs Development

  • RxJS, short for Reactive Extensions for JavaScript, is a library for composing asynchronous and event-based programs using observable sequences. It was first created in 2010 by Erik Meijer, Matthew Podwysocki, Paul Betts, and Lee Campbell.
  • RxJS follows the principles of reactive programming, which is based on the concept of data streams and the propagation of changes. It enables developers to handle complex asynchronous operations in a more concise and declarative manner.
  • One of the key features of RxJS is the use of Observables, which are sequences of values that can be observed over time. Observables allow developers to handle events, asynchronous requests, and data streams in a unified way.
  • RxJS provides a rich set of operators that enable developers to transform, filter, combine, and manipulate observables. These operators offer a powerful and expressive way to handle complex asynchronous scenarios.
  • Over the years, RxJS has evolved and introduced several major versions. Version 4, released in 2015, introduced a more modular and lightweight architecture. Version 5, released in 2016, brought significant performance improvements and introduced the concept of lettable operators.
  • Version 6, released in 2018, introduced a new set of import paths and improved tree shaking capabilities, resulting in smaller bundle sizes. It also introduced the pipeable operators syntax, which provides a more consistent and composable way to use operators.
  • RxJS has gained popularity in the JavaScript community and is widely used in modern web development. It has become an essential tool for handling complex asynchronous operations in frameworks like Angular, React, and Vue.
  • RxJS is not limited to JavaScript. It has been ported to several other programming languages, including Java, .NET, Swift, and Python, under the name ReactiveX. This allows developers to use the same reactive programming principles across different platforms and languages.
  • One of the groundbreaking concepts introduced by RxJS is the concept of reactive streams. Reactive streams provide a standard for asynchronous stream processing with non-blocking backpressure. This enables more efficient and scalable handling of data streams.
  • RxJS has a thriving community of developers who contribute to its development and share their knowledge through documentation, blog posts, and open-source projects. The community actively maintains the library and provides support to fellow developers.
  • RxJS continues to evolve and improve, with new features and optimizations being introduced in each version. It remains a fundamental tool for building reactive and event-driven applications in the JavaScript ecosystem.

TOP 10 RxJs Related Technologies

  • JavaScript

    JavaScript is the fundamental language for RxJs software development. It is a versatile and widely-used scripting language that allows developers to create interactive web pages and applications. With its support for functional programming, JavaScript is an excellent choice for reactive programming with RxJs.

  • RxJs

    RxJs, short for Reactive Extensions for JavaScript, is a powerful library for reactive programming. It provides a set of tools and operators that enable developers to work with asynchronous data streams. RxJs is widely used in modern web development for handling events, managing state, and creating responsive user interfaces.

  • TypeScript

    TypeScript is a superset of JavaScript that adds static typing to the language. It offers a more robust and scalable approach to RxJs development. With TypeScript, developers can catch errors at compile-time, enhance code readability, and improve the overall maintainability of RxJs projects.

  • Angular

    Angular is a popular web application framework that leverages RxJs for building reactive and scalable applications. It provides a complete development platform with features like data binding, dependency injection, and component-based architecture. By combining Angular with RxJs, developers can create responsive and event-driven applications.

  • React

    React is a widely-used JavaScript library for building user interfaces. While it doesn’t have built-in support for RxJs, developers can integrate RxJs with React to create reactive components and manage state in a more declarative manner. React’s virtual DOM and RxJs’s observables can work together seamlessly for building responsive UIs.

  • Vue.js

    Vue.js is a progressive JavaScript framework that offers a lightweight and flexible approach to building user interfaces. While not directly related to RxJs, developers can use Vue.js with RxJs to handle complex data flows and reactive updates in their applications. The combination of Vue.js’s simplicity and RxJs’s power can lead to efficient and scalable code.

  • Redux

    Redux is a predictable state management library commonly used with React applications. Although not specifically designed for RxJs, developers can integrate Redux with RxJs to handle complex state transformations and asynchronous actions. The combination of Redux’s unidirectional data flow and RxJs’s observables provides a powerful solution for managing application state.

Cases when RxJs does not work

  1. When working with synchronous operations: RxJS is primarily designed for handling asynchronous operations such as network requests or event streams. If you are dealing with synchronous operations where there is no need for handling asynchronous events, using RxJS might introduce unnecessary complexity and overhead.
  2. When the project has a small codebase: RxJS is a powerful tool for managing complex asynchronous flows and handling streams of data. However, if your project is small and does not involve a lot of asynchronous operations, using RxJS might be overkill and add unnecessary complexity to your code.
  3. When there is no need for reactive programming: Reactive programming with RxJS is beneficial when you need to handle continuous streams of events or when you want to react to changes in data over time. If your project does not require this level of reactivity, using RxJS might not provide any significant advantages.
  4. When the learning curve is a concern: RxJS has a steep learning curve, especially for developers who are new to reactive programming concepts. If the team does not have the time or resources to invest in learning RxJS, it might be more practical to use simpler alternatives for handling asynchronous operations.
  5. When performance is a critical factor: Although RxJS is known for its efficiency in handling asynchronous operations, in certain scenarios, it might not be the most performant solution. For extremely performance-sensitive applications, using lower-level constructs or libraries specifically optimized for the use case might be a better choice.

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