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Polina, Web3 Software Engineer

Last Updated: 25 Jan 2024

-Software Engineer with 5 years of professional experience, working across eCommerce & retail, Marketplace, Healthcare, Entertainment, Education, and Blockchain, Game domains. -Proficiency in PHP, JavaScript, TypeScript, React - Knowledge of Vanilla JS, Native PHP, PHP-Selenium - Experience working with Web3 marketplaces, nodes, on-chain, and off-chain transactions - Knowledge of Web3, understanding of Abi, Smart Contracts; Tampermonkey, Greasyfork - Knowledge Css3, Bootstrap 4; RPC; GitHub; MySQL - Has a successful track record of developing applications from scratch and optimizing existing systems, evidenced by projects such as a Learning Platform, Event Manager, and a Website for a Coin Game - Computer Science and Software Engineering Foundation

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PHP   5 yr.


JavaScript   5 yr.


TypeScript   1 yr.



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Evgeniy, Frontend JavaScript Software Engineer

Last Updated: 4 Jul 2023

- 2 years in Frontend Development (JavaScript) - English Intermediate - Available ASAP

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Rostislav P, Vue.js developer

Last Updated: 4 Jul 2023

Hardworking front-end developer with 3+ years of extensive experience. I’ve worked on several challenging projects and have solid technical knowledge.

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Aristidas, Software Engineer

Last Updated: 14 Nov 2023

- Software engineer with 6 years of experience in various domains including eCommerce & retail, Marketplace, Entertainment, CRM, and Fintech. - Proficient in programming languages such as PHP, JavaScript, and TypeScript. - Experienced in CMS and frameworks like Shopify, Laravel, WordPress, React, Next.js, Node.js, Express.js, and Gatsby.js. - Skilled in WordPress technologies and plugins such as WooCommerce, Gutenberg, Elementor, CF7, ACF, WP-Engine, Duplicator, WP Imports, WP-API, and LiteSpeed Cache. - Familiar with programming technologies like Redux, HTML/CSS, SASS/SCSS, Axios, Tailwind CSS, jQuery, Bootstrap, Liquid, Webpack, and Storybook. - Knowledgeable in databases such as MySQL, PostgreSQL, and MongoDB. - Proficient in DevOps tools like Docker, Docker Compose, and Nginx. - Experienced in source control systems like Git (GitHub/GitLab/Bitbucket). - Strong understanding of SDLC, software development practices, and REST API development. - Skilled in working with various methodologies, principles, paradigms, and patterns in software engineering. - Possess a computer science education background. - Achievements include leading development teams, making technical decisions, participating in development of Gutenberg blocks, and maintaining existing software applications. - Quick learner, customer-oriented, and goal-directed individual.

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PHP   6 yr.


TypeScript   3 yr.


Shopify   3 yr.


Laravel   2.5 yr.


React   4 yr.

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Last Updated: 14 Nov 2023

- Highly skilled software engineer with 7 years of experience in various industries such as eCommerce, blockchain, medicine, and education. - Proficient in programming languages such as PHP, JavaScript, TypeScript, and Solidity. - Experienced in CMS and frameworks including Laravel, Shopify, WordPress, React, Next.js, Vue.js, and Alpine.js. - Strong knowledge of WordPress technologies and plugins such as WooCommerce, Gutenberg, CF7, and ACF. - Expertise in programming technologies such as Blade templates, HTML/CSS, SASS/LESS, Tailwind CSS, Bootstrap, Redux, jQuery, REST API, Solana, Filament, Livewire, and Ajax. - Skilled in cloud platforms like AWS (S3, SES, SQS, EC2) and databases including MySQL, MariaDB, PostgreSQL, and MongoDB. - Proficient in DevOps tools like Docker, Docker Compose, GitHub Actions, and Nginx, and source control systems like Git (GitHub/GitLab/BitBucket).Note: The provided summary has been edited to remove personal information and make it more concise.

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PHP   7 yr.


TypeScript   4 yr.


Laravel   3 yr.


Shopify   2.5 yr.


React   3.5 yr.

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Table of Contents

What are top Bootstrap 4 instruments and tools?

  • Bootswatch: A collection of free themes for Bootstrap. It provides a variety of professionally designed and visually appealing themes that can be easily applied to any Bootstrap project. Bootswatch has been around since 2012 and has gained popularity for its extensive library of themes. It is widely used by developers looking to quickly enhance the look and feel of their Bootstrap websites.
  • Font Awesome: A popular icon set designed for use with Bootstrap. Font Awesome offers a vast collection of scalable vector icons that can be easily customized and integrated into Bootstrap projects. It was first released in 2012 and has since become a standard choice for developers looking to add icons to their websites. Font Awesome icons are widely supported across different browsers and devices.
  • Bootstrap Studio: A powerful desktop application that allows developers to design and build responsive websites using Bootstrap. It offers a drag-and-drop interface, pre-built components, and a live preview feature that makes it easy to create and customize Bootstrap layouts. Bootstrap Studio was first released in 2015 and has gained popularity for its intuitive design workflow and time-saving features.
  • Sass: A CSS preprocessor that extends the functionality of CSS and provides additional features like variables, mixins, and nesting. Bootstrap 4 is built with Sass, making it easier for developers to customize and maintain their stylesheets. Sass was initially released in 2006 and has gained widespread adoption in the web development community.
  • jQuery: A fast and feature-rich JavaScript library that simplifies HTML document traversal, event handling, and animation. Bootstrap 4 relies on jQuery for its interactive components and dynamic behaviors. jQuery was first released in 2006 and has become one of the most widely used JavaScript libraries, powering a large number of websites and web applications.
  • Visual Studio Code: A lightweight and versatile code editor developed by Microsoft. It provides a rich ecosystem of extensions that enhance the development experience for Bootstrap projects. Visual Studio Code offers features like IntelliSense, debugging, and version control integration, making it a popular choice among developers working with Bootstrap.
  • Grunt: A JavaScript task runner that automates repetitive tasks in the development workflow. It can be used to compile Sass, concatenate and minify CSS and JavaScript files, optimize images, and more. Grunt integrates well with Bootstrap and helps streamline the build process for web projects. It was first released in 2012 and has gained a strong following in the web development community.

Soft skills of a Bootstrap 4 Developer

Soft skills are essential for a Bootstrap 4 Developer to excel in their role and contribute to the success of a project. These skills complement technical expertise and enable developers to effectively communicate, collaborate, and solve problems. Here are the soft skills required at different levels of experience:


  • Adaptability: Ability to quickly learn and adapt to new technologies and frameworks.
  • Teamwork: Collaborating effectively with team members to achieve project goals.
  • Time management: Prioritizing tasks and meeting deadlines in a fast-paced environment.
  • Communication: Clearly conveying ideas and updates to team members and stakeholders.
  • Attention to detail: Paying close attention to code quality and ensuring accuracy in implementation.


  • Problem-solving: Identifying and resolving technical issues and challenges.
  • Leadership: Taking ownership of tasks and guiding junior developers when needed.
  • Critical thinking: Analyzing requirements and making informed decisions.
  • Flexibility: Adapting to changing project requirements and client needs.
  • Collaboration: Working closely with designers and other stakeholders to achieve project goals.
  • Client management: Effectively communicating with clients and understanding their needs.
  • Self-motivation: Taking initiative and continuously improving skills and knowledge.


  • Mentoring: Guiding and mentoring junior and middle-level developers.
  • Strategic thinking: Contributing to project planning and making long-term decisions.
  • Client relationship management: Building and maintaining strong relationships with clients.
  • Negotiation: Negotiating project scope, timelines, and budgets with clients.
  • Project management: Overseeing the development process and ensuring timely delivery.
  • Conflict resolution: Resolving conflicts and fostering a positive work environment.
  • Innovation: Identifying and implementing new technologies and best practices.
  • Quality assurance: Ensuring high-quality code and adherence to coding standards.

Expert/Team Lead

  • Strategic leadership: Providing strategic direction and guidance to the development team.
  • Business acumen: Understanding business goals and aligning them with technical solutions.
  • Team management: Managing and motivating a team of developers to achieve project success.
  • Client acquisition: Identifying and acquiring new clients for the organization.
  • Risk management: Identifying and mitigating risks throughout the project lifecycle.
  • Continuous improvement: Implementing process improvements and driving innovation.
  • Presentation skills: Presenting technical concepts and project updates to clients and stakeholders.
  • Emotional intelligence: Understanding and managing emotions to build strong relationships.
  • Conflict resolution: Resolving complex conflicts and promoting effective collaboration.
  • Strategic partnerships: Establishing and nurturing partnerships with other organizations.
  • Industry expertise: Staying updated with the latest trends and advancements in web development.

TOP 10 Bootstrap 4 Related Technologies

  • HTML5

    HTML5 is the cornerstone language for building websites and web applications. It provides the structure and semantic markup necessary for modern web development. With Bootstrap 4, HTML5 is used extensively for creating the basic structure and layout of web pages.

  • CSS3

    CSS3 is the latest version of the Cascading Style Sheets language. It enhances the visual appearance of web pages by controlling the layout, colors, fonts, and other visual aspects. In Bootstrap 4, CSS3 is utilized for applying styles to HTML elements and customizing the look and feel of the website.

  • JavaScript

    JavaScript is a versatile programming language that enables dynamic and interactive functionality on the web. It is a crucial part of Bootstrap 4 as it allows for client-side scripting, handling user interactions, and creating responsive components.

  • jQuery

    jQuery is a fast, lightweight, and feature-rich JavaScript library that simplifies HTML document traversal, event handling, and animation. It is extensively used in Bootstrap 4 for enhanced DOM manipulation, AJAX functionality, and creating interactive user interfaces.

  • Sass

    Sass (Syntactically Awesome Style Sheets) is a CSS preprocessor that adds powerful features and simplifies the process of writing CSS. Bootstrap 4 leverages Sass to provide a more efficient and modular approach to styling, allowing developers to customize the framework with ease.

  • React

    React is a popular JavaScript library for building user interfaces. It follows a component-based architecture, making it easier to manage complex UIs. Bootstrap 4 integrates with React, allowing developers to create reusable UI components and take advantage of React’s efficient rendering capabilities.

  • Webpack

    Webpack is a module bundler that takes modules with dependencies and generates static assets. It is used in Bootstrap 4 to compile and bundle all the necessary assets, such as HTML, CSS, and JavaScript files, optimizing the performance and maintainability of the project.

TOP 13 Tech facts and history of creation and versions about Bootstrap 4 Development

  • Bootstrap 4 is a popular front-end development framework that was first released in August 2017.
  • It was created by Mark Otto and Jacob Thornton while they were working at Twitter.
  • Bootstrap 4 is built on the principles of mobile-first development, ensuring that websites are optimized for mobile devices.
  • One of the key features of Bootstrap 4 is its responsive grid system, which allows developers to easily create responsive layouts.
  • Bootstrap 4 introduced a new flexbox-based grid system, providing more flexibility and control over layout structures.
  • The framework includes a wide range of pre-designed components and utilities, making it easy for developers to build websites quickly.
  • Bootstrap 4 introduced a new modular architecture, allowing developers to customize and selectively include components.
  • It supports the latest versions of HTML, CSS, and JavaScript, ensuring compatibility with modern web standards.
  • Bootstrap 4 includes a powerful set of Sass variables and mixins, making it easy to customize the look and feel of a website.
  • It has a large and active community, with extensive documentation, tutorials, and support available.
  • Bootstrap 4 has gone through several alpha and beta releases before reaching its stable version.
  • The latest stable release of Bootstrap 4 is version 4.5.3, which was released in October 2020.
  • Bootstrap 4 is widely used by developers and is trusted by many major companies and organizations.

Pros & cons of Bootstrap 4

7 Pros of Bootstrap 4

  • Responsive Design: Bootstrap 4 offers a responsive grid system, making it easy to create websites that look great on any device, from desktops to mobile devices.
  • Easy to Use: With its extensive documentation and pre-built components, Bootstrap 4 simplifies the process of building responsive websites, even for developers with limited experience.
  • Consistency: Bootstrap 4 provides a consistent and standardized design language, ensuring that your website looks professional and cohesive.
  • Customizable: While Bootstrap 4 comes with a default design, it also allows for customization, enabling developers to create unique and personalized websites.
  • Browser Compatibility: Bootstrap 4 is compatible with all major browsers, ensuring that your website functions and appears correctly across different platforms.
  • Community Support: As one of the most popular front-end frameworks, Bootstrap 4 has a large and active community, which means plenty of resources, tutorials, and support are available.
  • Speed of Development: With its ready-to-use components and templates, Bootstrap 4 accelerates the development process, allowing developers to create websites more efficiently.

7 Cons of Bootstrap 4

  • Learning Curve: Although Bootstrap 4 is relatively easy to use, beginners may need some time to familiarize themselves with its syntax and structure.
  • Heavy File Size: The default version of Bootstrap 4 has a larger file size compared to other frameworks, which may impact website loading speed.
  • Design Limitations: While Bootstrap 4 provides a solid foundation, it may not offer the flexibility and customization options required for highly unique or complex designs.
  • Dependency on jQuery: Bootstrap 4 relies on jQuery, which adds an additional dependency and may increase the complexity of your project.
  • Overused Design: Due to its popularity, many websites built with Bootstrap 4 may end up looking similar, potentially leading to a lack of originality.
  • Updates and Compatibility: As with any framework, updates may introduce changes that require developers to modify their existing code for compatibility.
  • Performance Trade-offs: Using a framework like Bootstrap 4 can lead to more code and dependencies, potentially impacting the performance of your website.

How and where is Bootstrap 4 used?

Case NameCase Description
Responsive Web DesignBootstrap 4 provides a responsive grid system that allows developers to create websites that adapt to different screen sizes and devices. This ensures a consistent user experience across various platforms, from desktops to mobile devices, without the need for custom CSS media queries. The responsive design capabilities of Bootstrap 4 make it an ideal choice for building websites that reach a wide audience.
Mobile Application DevelopmentBootstrap 4 offers a mobile-first approach, making it suitable for developing mobile applications. With its pre-designed components and responsive grid system, developers can quickly build mobile interfaces that are optimized for touch interactions and provide a seamless user experience on smartphones and tablets. Bootstrap 4 also includes mobile-friendly navigation components, such as collapsible menus and off-canvas navigation, which are commonly used in mobile app development.
Front-end PrototypingBootstrap 4 comes with a vast collection of ready-to-use UI components, such as buttons, forms, cards, and modals, that can be easily customized and combined to create interactive prototypes. This allows developers to quickly visualize and test their design ideas without investing significant time and effort in coding from scratch. Bootstrap 4’s prototyping capabilities make it an indispensable tool for designers and developers looking to iterate and refine their web and mobile app designs.
Single-Page ApplicationsBootstrap 4 is well-suited for building single-page applications (SPAs) due to its robust JavaScript plugins and components. SPAs rely heavily on dynamic content loading and smooth page transitions, both of which can be achieved using Bootstrap 4’s JavaScript-powered features like carousels, modals, and scrollspy. Additionally, Bootstrap 4’s built-in support for AJAX and its integration with popular JavaScript frameworks, such as Angular and React, make it a preferred choice for developing SPAs.
Content Management SystemsBootstrap 4 can be effectively utilized in the development of content management systems (CMS) due to its flexible layout system and extensive set of components. CMS platforms often require a consistent design across multiple pages and user-friendly interfaces for managing content. Bootstrap 4’s grid system enables developers to create consistent and responsive layouts, while its UI components can be leveraged to build intuitive admin panels and content editing interfaces.
E-commerce WebsitesBootstrap 4 provides a solid foundation for building e-commerce websites with its robust grid system, responsive design, and extensive set of UI components. E-commerce sites often require complex layouts, product galleries, shopping carts, and checkout processes that can be easily implemented using Bootstrap 4’s pre-built components. Furthermore, Bootstrap 4’s integration with popular e-commerce platforms like WooCommerce and Shopify ensures seamless compatibility and easy customization.
Dashboard ApplicationsBootstrap 4 excels in creating dashboard applications that present data and analytics in a visually appealing and user-friendly manner. Its modular and customizable components, such as charts, data tables, and progress bars, allow developers to build interactive dashboards that provide real-time insights and data visualization. Bootstrap 4’s extensive documentation and community support make it an excellent choice for developers working on dashboard applications.
Portfolio WebsitesBootstrap 4’s flexible grid system and versatile components make it an excellent framework for creating portfolio websites. Whether it’s showcasing photography, design projects, or other creative works, Bootstrap 4 offers a range of layout options and styling possibilities. Its responsive nature ensures that portfolios look great on different devices, while its built-in CSS classes and utilities make it easy to create visually appealing and engaging portfolio pages.

Hard skills of a Bootstrap 4 Developer

As a Bootstrap 4 Developer, having the right hard skills is crucial for success in the field. Here are the hard skills required at different levels of expertise:


  • HTML and CSS: Proficiency in HTML and CSS is essential for building responsive and visually appealing websites using Bootstrap 4.
  • Bootstrap 4 Components: Understanding and effectively utilizing the various components provided by Bootstrap 4, such as buttons, forms, navigation bars, and grids.
  • Responsive Design: Ability to create responsive layouts that adapt well to different screen sizes and devices.
  • Basic JavaScript: Familiarity with JavaScript fundamentals for implementing interactive elements and enhancing the functionality of Bootstrap components.
  • Version Control: Knowledge of version control systems like Git to collaborate with other developers and manage code efficiently.


  • Advanced CSS: Proficiency in CSS preprocessors like SASS or LESS for more efficient and maintainable styling of Bootstrap components.
  • Bootstrap Customization: Ability to customize Bootstrap 4 by modifying variables, mixins, and styles to match specific design requirements.
  • Browser Compatibility: Understanding cross-browser compatibility issues and implementing appropriate solutions to ensure consistent rendering across different browsers.
  • Performance Optimization: Knowledge of techniques to optimize the performance of Bootstrap 4 websites, such as minification, lazy loading, and image optimization.
  • Responsive Images: Implementing responsive image techniques, such as srcset and sizes attributes, to serve appropriate images based on device capabilities and screen sizes.
  • Debugging and Troubleshooting: Proficiency in debugging tools and techniques to identify and resolve issues in Bootstrap 4 projects.
  • Accessibility: Awareness of web accessibility standards and best practices, ensuring that Bootstrap 4 websites are accessible to users with disabilities.


  • Advanced JavaScript: Strong proficiency in JavaScript, including frameworks like jQuery, for advanced interactivity and dynamic content manipulation within Bootstrap 4 projects.
  • Performance Testing: Ability to conduct performance testing and analysis to identify bottlenecks and optimize the performance of Bootstrap 4 websites.
  • Responsive Typography: Implementing responsive typography techniques to ensure optimal readability and legibility across different devices and screen resolutions.
  • Front-End Build Tools: Knowledge of build tools like Gulp or Webpack for automating tasks, such as minification, bundling, and asset optimization.
  • Code Optimization: Applying advanced optimization techniques, such as code splitting and lazy loading, to improve the loading speed and efficiency of Bootstrap 4 websites.
  • Cross-Platform Development: Experience in developing Bootstrap 4 websites that work seamlessly across different platforms, including desktop, mobile, and tablet devices.
  • Performance Monitoring: Utilizing monitoring tools and analytics to track and analyze the performance of Bootstrap 4 websites, making data-driven optimizations.
  • Team Collaboration: Ability to lead and collaborate with a team of developers, providing guidance, code reviews, and fostering a collaborative work environment.

Expert/Team Lead

  • Advanced Responsive Design: Expertise in creating complex and highly customized responsive designs using Bootstrap 4, pushing the boundaries of its capabilities.
  • Accessibility Compliance: In-depth knowledge of accessibility guidelines and regulations, ensuring Bootstrap 4 websites comply with accessibility standards.
  • Performance Optimization Strategies: Implementing advanced performance optimization strategies, such as caching, CDN integration, and server-side rendering.
  • Front-End Architecture: Designing scalable and maintainable front-end architectures using advanced patterns and methodologies, ensuring code reusability and modularity.
  • UI/UX Design Principles: Understanding and applying user-centered design principles to enhance the user experience of Bootstrap 4 websites.
  • Code Review and Quality Assurance: Conducting comprehensive code reviews, implementing quality assurance processes, and ensuring adherence to best coding practices.
  • Client Communication: Excellent communication skills to effectively communicate with clients, understand their requirements, and provide technical guidance and recommendations.
  • Leadership and Mentoring: Ability to lead and mentor a team of developers, providing guidance, technical support, and fostering professional growth.
  • Project Management: Experience in managing and coordinating complex Bootstrap 4 projects, ensuring timely delivery, resource allocation, and quality control.
  • Continuous Learning: Demonstrating a passion for continual learning and keeping up-to-date with the latest trends, technologies, and best practices in Bootstrap 4 development.
  • Problem Solving: Strong analytical and problem-solving skills to tackle complex challenges and find innovative solutions within Bootstrap 4 projects.

Cases when Bootstrap 4 does not work

  1. Outdated browser support: Bootstrap 4 is designed to be compatible with modern browsers such as Chrome, Firefox, Safari, and Edge. However, if users are using outdated browsers that do not support the latest web technologies, certain Bootstrap 4 features may not work as expected.
  2. Conflicting CSS: If your project already has custom CSS styles that conflict with the default styles provided by Bootstrap 4, it can lead to unexpected visual inconsistencies or layout issues. In such cases, you may need to modify or override the conflicting styles to ensure proper functionality.
  3. Incompatible JavaScript libraries: Bootstrap 4 relies on JavaScript for certain interactive components and features. If your project includes other JavaScript libraries that conflict with Bootstrap’s JavaScript code, it can cause conflicts and break the functionality of Bootstrap components.
  4. Inappropriate usage: Bootstrap 4 is a powerful framework, but it may not be suitable for every project. If you have specific design requirements or complex layout structures that go beyond what Bootstrap offers out-of-the-box, you may encounter limitations or difficulties in achieving your desired result using Bootstrap 4 alone.
  5. Customization limitations: While Bootstrap 4 provides a wide range of customization options, there may be cases where you need highly specific or unique design elements that are not easily achievable through the framework’s built-in customization features. In such cases, you may need to resort to custom CSS or consider alternative frameworks or tools.
  6. Performance considerations: Bootstrap 4 is a comprehensive framework with numerous CSS and JavaScript files. If performance optimization is a critical concern for your project, the additional file size and processing overhead introduced by Bootstrap 4 may not be ideal. In such cases, you might consider using a lightweight alternative or hand-coding your CSS and JavaScript for more efficient performance.
  7. Accessibility requirements: While Bootstrap 4 incorporates certain accessibility features, it may not meet all the specific accessibility requirements of your project. Depending on the level of accessibility compliance needed, you may need to supplement Bootstrap 4 with additional accessibility enhancements or consider alternative frameworks that focus more explicitly on accessibility.

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