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Oleg A., PHP Backend Engineer

Gdansk, Poland
Last Updated: 2 Apr 2024
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- 11+ years of experience in web development and 4 years of experience in the Fintech domain. - Proficient in various PHP frameworks such as YII2, Laravel and Symfony. - Experienced in front-end technologies including HTML5, CSS3, SASS, LESS, and JavaScript. - Strong knowledge of APIs and integrating payment gateways (Crypto, APM, S2S). - Expertise in designing and developing secure web applications. - Familiarity with AWS, Microsoft Azure, and other cloud infrastructure management. - Proven track record of successfully delivering projects on time and within budget, receiving commendations for technical prowess, innovative solutions, and team collaboration. - Location: Poland - Available: ASAP

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Edik B., Software engineer

Yerevan, Armenia
Last Updated: 31 Oct 2023

- Active software engineer with over 7 years of professional enterprise experience in developing and maintaining web applications. - Skilled in testing, cloud computing, and web development. - Proficient in HTML5, CSS3, JavaScript, and other web development technologies. - Experienced in both back-end and front-end development, with expertise in creating user-friendly and effective websites and applications. - Strong knowledge of JavaScript frameworks such as Vue.js and React.js. - Familiarity with .NET and .NET Core, as well as ASP.NET MVC and Web API. - Proficient in working with databases such as MSSQL, MySQL, MongoDB, and Postgres. - Experienced in cloud infrastructure platforms like AWS and Google Cloud Platform. - Knowledgeable in CI/CD processes, using tools like Terraform, Gitlab, and Docker. - Advanced English

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Vlad D, Full-Stack Python Software Engineer

Kyiv, Ukraine
Last Updated: 4 Jul 2023
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- Full-Stack (Python + Vue.js) Software Engineer with a background in digital marketing; - Core Python, Flask & Django Frameworks, reusable code - RESTful APIs - MVC, SOLID, DRY principles; - SQL, Django ORM, Elastic Search Platform - Upper-intermediate English; - Available ASAP

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Olga D., Markup/Front-end developer

Last Updated: 4 Jul 2023

- 10 years of experience developing HTML/CSS/WP of any complexity - Creation semantic, fully responsive, and PixelPerfect HTML/CSS layouts for mobile and web applications - Upper-Intermediate English - Available ASAP

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Max Snischuk, Front-end Developer

Last Updated: 15 Apr 2024

Software engineer with over five years of experience as a front-end developer, specializing in responsive web development and the implementation of web applications. Proficient in HTML5, CSS3, SASS/SCSS, and JavaScript, with a foundational understanding of React. Experienced with front-end build tools like Gulp and webpack, as well as version control systems including Git and platforms like Gitlab and GitHub. Demonstrates strong problem-solving skills in client service roles and is well-versed in SDLC practices and compliance protocols, including KYC checks and CDD reviews. Holds an ongoing education in front-end development, with a commitment to continuous improvement and the application of modern development methodologies and patterns.

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Upstaff.com was launched in 2019, addressing software service companies, startups and ISVs, increasingly varying and evolving needs for qualified software engineers

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This is a super team to work with. Through Upstaff, I have had multiple projects to work on. Work culture has been awesome, teammates have been super nice and collaborative, with a very professional management. There's always a project for you if you're into tech such Front-end, Back-end, Mobile Development, Fullstack, Data Analytics, QA, Machine Learning / AI, Web3, Gaming and lots more. It gets even better because many projects even allow full remote from anywhere! Nice job to the Upstaff Team 🙌🏽.
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Хочу виразити велику подяку за таку швидку роботу по підбору двох розробників. Та ще й у такий короткий термін-2 дні. Це мене здивувало, адже ми шукали вже цілий місяць. І знайдені кандидати нам не підходили Це щось неймовірне. Доречі, ці кандидати працюють у нас і зараз. Та надать приклад іншим працівникам. Гарного дня!)
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FAQs about HTML5 Development

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If you urgently need a verified and qualified HTML5 developer, and resources for finding the right candidate are lacking, UPSTAFF is exactly the service you need. We approach the selection of HTML5 developers professionally, tailored precisely to your needs. From placing the call to the completion of your task by a qualified developer, only a few days will pass.

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Undoubtedly, there are dozens, if not hundreds, of specialized services and platforms on the network for finding the right HTML5 engineer. However, only UPSTAFF offers you the service of selecting real qualified professionals almost in real time. With Upstaff, software development is easier than calling a taxi.

How are Upstaff HTML5 developers different? Arrow

AI tools and expert human reviewers in the vetting process are combined with a track record and historically collected feedback from clients and teammates. On average, we save over 50 hours for client teams in interviewing HTML5 candidates for each job position. We are fueled by a passion for technical expertise, drawn from our deep understanding of the industry.

How quickly can I hire HTML5 developers through Upstaff? Arrow

Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched HTML5 Talents. Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person. Validate Your Choice. Bring a new HTML5 developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

How does Upstaff vet remote HTML5 engineers? Arrow

Upstaff Managers conduct an introductory round with potential candidates to assess their soft skills. Additionally, the talent’s hard skills are evaluated through testing or verification by a qualified developer during a technical interview. The Upstaff Staffing Platform stores data on past and present HTML5 candidates. Upstaff managers also assess talent and facilitate rapid work and scalability, offering clients valuable insights into their talent pipeline. Additionally, we have a matching system within the platform that operates in real-time, facilitating efficient pairing of candidates with suitable positions.

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Table of Contents

Soft skills of a HTML5 Developer

Soft skills are just as important as technical skills for an HTML5 developer. These skills help them communicate effectively, work well in a team, and adapt to changing situations. Here are the soft skills required at different levels of expertise:


  • Attention to detail: Paying close attention to code structure and syntax is crucial for producing clean and error-free HTML5 code.
  • Time management: Junior developers should be able to manage their time effectively to meet deadlines and deliver projects on time.
  • Collaboration: Working well with others, seeking guidance, and contributing to team discussions are important skills for a junior HTML5 developer.
  • Problem-solving: Junior developers should have the ability to analyze and troubleshoot HTML5 code issues independently.
  • Continuous learning: Being open to learning new concepts and technologies is important for staying up-to-date in the rapidly evolving field of HTML5 development.


  • Communication: Mid-level developers should have strong written and verbal communication skills to effectively convey ideas and requirements to team members and clients.
  • Leadership: Taking ownership of tasks, guiding junior developers, and providing technical expertise to the team are important skills for a middle-level HTML5 developer.
  • Adaptability: Being able to quickly adapt to changing project requirements and technologies is crucial for a mid-level developer.
  • Attention to User Experience (UX): Understanding the principles of UX design and applying them to HTML5 development can greatly enhance the quality of the final product.
  • Problem-solving: Mid-level developers should have advanced problem-solving skills to handle complex HTML5 coding challenges and find efficient solutions.
  • Client management: Building and maintaining positive relationships with clients, understanding their needs, and effectively managing expectations are important skills for a middle-level developer.
  • Quality assurance: Conducting thorough code reviews and testing to ensure the quality and performance of HTML5 applications is essential at this level.


  • Mentorship: Senior developers should be able to mentor and guide junior and mid-level developers, sharing their knowledge and expertise.
  • Project management: Having strong project management skills to oversee multiple projects, allocate resources, and ensure timely delivery is important at the senior level.
  • Strategic thinking: Senior developers should be able to think strategically and make informed decisions that align with the overall goals of the project and organization.
  • Client relationship management: Building and maintaining long-term relationships with clients, understanding their business objectives, and providing strategic advice are important skills for a senior HTML5 developer.
  • Innovation: Senior developers should be able to bring innovative ideas and solutions to the table, pushing the boundaries of HTML5 development.
  • Code optimization: Optimizing HTML5 code for performance, scalability, and maintainability is a key skill for senior developers.
  • Team collaboration: Working seamlessly with cross-functional teams, such as designers and backend developers, to deliver integrated solutions is important at the senior level.
  • Industry knowledge: Staying informed about the latest trends, best practices, and emerging technologies in HTML5 development is crucial for a senior developer.

Expert/Team Lead

  • Strategic planning: Expert-level developers should be able to develop long-term strategies and roadmaps for HTML5 development projects.
  • Team leadership: Leading and managing a team of developers, setting goals, and providing guidance and support are important skills for an expert/team lead.
  • Budget management: Expert developers should have a good understanding of project budgets and be able to manage resources efficiently.
  • Client consultation: Providing strategic advice and consulting services to clients, helping them make informed decisions about HTML5 development projects, is essential at this level.
  • Thought leadership: Being recognized as an industry expert and actively contributing to the HTML5 development community through blogs, conferences, and publications.
  • Conflict resolution: Expert developers should have strong conflict resolution skills to handle disagreements and resolve issues within the team or with clients.
  • Business acumen: Having a deep understanding of the business side of HTML5 development, including market trends, competition, and ROI, is crucial for an expert/team lead.
  • Continuous improvement: Striving for continuous improvement by identifying areas for enhancement, implementing best practices, and driving innovation in HTML5 development.
  • Technical expertise: Expert developers should have an in-depth knowledge of HTML5, including advanced techniques, frameworks, and libraries, and be able to mentor others in these areas.
  • Decision-making: Expert developers should have strong decision-making skills, considering various factors such as technical feasibility, business impact, and user experience.
  • Resilience: Expert developers should be able to handle high-pressure situations, adapt to unexpected challenges, and find solutions to complex problems.

How and where is HTML5 used?

Case NameCase Description
Responsive Web DesignHTML5 enables developers to create websites that automatically adapt to different screen sizes and devices. This allows for a consistent user experience across desktops, tablets, and smartphones. With HTML5, developers can use features like media queries and flexible grids to build responsive web designs, ensuring optimal usability on any device.
Offline Web ApplicationsHTML5 includes the ability to store web application data locally, allowing users to access and interact with web apps even when they are offline. This feature is particularly useful for applications that require constant access to data or need to function in areas with limited or unreliable internet connectivity.
Rich Media ContentHTML5 provides native support for audio and video playback without the need for plugins like Flash. This allows developers to easily embed multimedia content directly into web pages with better performance and compatibility across different browsers and devices.
Canvas-based GraphicsHTML5 introduces the element, which enables developers to create and manipulate graphics and animations directly within the web browser. This feature is widely used in game development, data visualization, and interactive multimedia applications.
Drag and DropHTML5 includes built-in support for drag and drop functionality, making it easier for developers to implement intuitive user interfaces. This feature is commonly used in web applications that require users to interact with elements by dragging and dropping them to perform actions like file uploads or rearranging items.
GeolocationHTML5 provides an API for accessing the user’s location information through their device’s GPS or other location sensors. This feature is utilized in various applications such as mapping services, location-based marketing, and navigation systems.
Form EnhancementsHTML5 introduces several new form input types and attributes, allowing developers to create more interactive and user-friendly web forms. Examples include date pickers, range sliders, email validation, and input pattern matching. These enhancements improve the overall user experience and streamline data collection.

Cases when HTML5 does not work

  1. Browser Compatibility: HTML5 may not work properly or have limited support in older browsers such as Internet Explorer 8 and below. These browsers were developed before HTML5 was standardized and may not fully support its features. Users on older browsers may experience rendering issues or missing functionality when accessing HTML5 content.
  2. Mobile Devices: While HTML5 is designed to be mobile-friendly, not all mobile devices or browsers fully support HTML5 features. This can lead to inconsistencies in the rendering and functionality of HTML5 content on different mobile platforms.
  3. JavaScript Disabled: HTML5 relies heavily on JavaScript for many of its advanced features, such as video playback, geolocation, and dynamic content updates. If a user has JavaScript disabled in their browser settings, certain HTML5 functionalities may not work as intended.
  4. Network Limitations: HTML5 introduces new technologies like WebSockets and WebRTC, which enable real-time communication and data streaming. However, these features may not function properly or be blocked by firewalls or network configurations in certain environments, limiting their availability.
  5. Outdated Software: In some cases, HTML5 may not work due to outdated software or plugins. For example, if a user has an outdated version of Adobe Flash Player installed, which is still required for certain multimedia content, it may interfere with the proper functioning of HTML5 elements.
  6. Security Restrictions: HTML5 incorporates powerful features like local storage, web workers, and cross-origin resource sharing (CORS). However, these features can be restricted or disabled by security settings in the browser or network environment, preventing HTML5 from functioning as intended.
  7. Accessibility Challenges: HTML5 introduces new elements and attributes that improve accessibility, such as the <video> and <audio> tags. However, if these elements are not used correctly or if proper accessibility guidelines are not followed, it can hinder the accessibility of HTML5 content for users with disabilities.
  8. Invalid Markup: HTML5 requires adherence to strict markup standards. If the HTML code is not properly structured or contains errors, it may cause rendering issues or unexpected behavior in HTML5-supported browsers.

What are top HTML5 instruments and tools?

  • Sublime Text: Sublime Text is a popular code editor that provides a sleek user interface and powerful features for HTML5 development. It has been widely used by developers since its initial release in 2008, offering syntax highlighting, code completion, and multiple cursors for efficient coding.
  • Visual Studio Code: Visual Studio Code, developed by Microsoft, is another widely adopted code editor for HTML5 development. It offers a rich set of features, including debugging support, intelligent code suggestions, and extensions for enhanced functionality. Since its launch in 2015, it has gained popularity among developers due to its versatility and performance.
  • Bootstrap: Bootstrap is a popular front-end framework that provides a collection of pre-designed HTML and CSS templates. It simplifies the process of building responsive web pages by offering ready-made components and a grid system. Initially released in 2011 by Twitter, Bootstrap has become a go-to tool for many developers to create visually appealing and mobile-friendly websites.
  • jQuery: jQuery is a fast and concise JavaScript library that simplifies HTML document traversal, event handling, and animation. It was first released in 2006 and has since been widely used to enhance the interactivity and user experience of websites. jQuery’s popularity lies in its simplicity and compatibility with various browsers.
  • Gulp: Gulp is a task runner built on top of Node.js, allowing developers to automate repetitive tasks during the HTML5 development process. It helps optimize and streamline workflows by automating tasks such as minification, concatenation, and image optimization. Gulp was released in 2013 and has gained popularity due to its simplicity and extensive plugin ecosystem.
  • Sass: Sass (Syntactically Awesome Style Sheets) is a CSS preprocessor that extends the capabilities of traditional CSS by providing features like variables, mixins, and nested rules. It was first introduced in 2006 and has gained popularity for its ability to make CSS code more modular and maintainable. Sass is widely used in HTML5 development to write cleaner and more efficient stylesheets.
  • Chrome DevTools: Chrome DevTools is a set of web development and debugging tools built into the Google Chrome browser. It provides a comprehensive suite of features, including live editing of HTML and CSS, performance analysis, JavaScript debugging, and network monitoring. Developers rely on Chrome DevTools to inspect and optimize HTML5 websites for better performance and responsiveness.
  • Adobe Dreamweaver: Adobe Dreamweaver is a professional web design and development tool that supports HTML5 and other web technologies. It offers a visual interface along with code editing capabilities, making it suitable for both beginners and experienced developers. Dreamweaver has been a popular choice among web designers since its initial release in 1997.
  • GitHub: GitHub is a web-based platform that provides version control and collaboration features for developers. It allows for easy sharing and collaboration on HTML5 projects, making it an essential tool for many developers. GitHub was launched in 2008 and has become the largest host of source code repositories, fostering open-source collaboration.

TOP 13 Facts about HTML5

  • HTML5 is the fifth and latest version of the Hypertext Markup Language (HTML) used for structuring and presenting content on the World Wide Web.
  • It was developed and standardized by the World Wide Web Consortium (W3C) with the aim of improving the language to better support multimedia elements, improve accessibility, and provide better cross-platform compatibility.
  • HTML5 introduces a range of new elements and attributes, such as <video>, <audio>, <canvas>, and <progress>, which allow developers to embed and manipulate multimedia content directly within web pages without relying on external plugins like Flash.
  • One of the key features of HTML5 is its ability to support offline web applications through the use of the Application Cache and Local Storage features. This enables users to access web apps even when they are not connected to the internet.
  • With HTML5, web developers can create more interactive and dynamic web pages by utilizing the new JavaScript APIs, including the Geolocation API, Drag and Drop API, and Web Storage API.
  • HTML5 includes a new form validation feature that allows developers to validate user input without relying on JavaScript or server-side validation. This helps improve the user experience and reduces the need for additional code.
  • Mobile support is a crucial aspect of HTML5, as it provides a more consistent and seamless experience across different devices and screen sizes. The introduction of responsive design techniques in HTML5 allows web pages to automatically adapt and adjust their layout based on the user’s device.
  • HTML5 also introduces the Web Workers API, which enables developers to run scripts in the background to offload computationally intensive tasks from the main thread. This improves performance and responsiveness of web applications.
  • The new semantic elements in HTML5, such as <header>, <nav>, <section>, and <footer>, provide a clearer and more meaningful structure to web documents, making them more accessible and search engine friendly.
  • HTML5 supports the Scalable Vector Graphics (SVG) format, allowing developers to create and manipulate high-quality vector-based graphics directly within the browser without the need for external plugins or software.
  • Video and audio elements in HTML5 support native playback of multimedia content, eliminating the need for third-party plugins like Flash or Silverlight. This improves performance, security, and reduces dependency on proprietary technologies.
  • HTML5 includes the Web Storage API, which provides a simpler and more efficient way to store and retrieve data on the client-side. This helps reduce server load and improves the overall performance of web applications.
  • Accessibility is a key focus in HTML5, with new features and elements introduced to ensure that web content is more accessible to users with disabilities. These include the <figure>, <figcaption>, and <details> elements, as well as improved support for ARIA attributes.

TOP 10 HTML5 Related Technologies

  • JavaScript

    JavaScript is the most fundamental language for HTML5 software development. It is a versatile scripting language that allows developers to create interactive and dynamic web pages. With its wide adoption and extensive libraries, JavaScript is essential for building modern web applications.

  • HTML5

    HTML5 is the latest version of the Hypertext Markup Language that revolutionized web development. It provides new features and enhancements for multimedia, graphics, and interactivity. HTML5 is the backbone of modern web applications and is supported by all major browsers.

  • CSS3

    CSS3 is the latest version of Cascading Style Sheets that allows developers to style and format HTML documents. It introduces new design options, such as gradients, shadows, and animations, making web pages visually appealing. CSS3 is essential for creating modern and responsive user interfaces.

  • React

    React is a popular JavaScript library for building user interfaces. It provides a component-based architecture, allowing developers to create reusable UI components. React is highly efficient and offers virtual DOM rendering, making it ideal for large-scale applications.

  • Angular

    Angular is a powerful JavaScript framework developed by Google. It offers a comprehensive set of tools for building robust web applications. Angular follows the Model-View-Controller (MVC) pattern and provides features like two-way data binding and dependency injection.

  • Node.js

    Node.js is a server-side JavaScript runtime environment. It allows developers to build scalable and high-performance network applications. Node.js utilizes an event-driven, non-blocking I/O model, making it efficient for handling concurrent requests.

  • Bootstrap

    Bootstrap is a popular CSS framework that simplifies web design and development. It provides a collection of pre-designed UI components and responsive grid system. Bootstrap enables developers to create visually appealing and mobile-friendly websites quickly.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssisting in the development of software applications, debugging and troubleshooting code, collaborating with senior developers, learning new technologies and programming languages.$50,000 – $70,000
Middle2-5 yearsDesigning and implementing software solutions, writing efficient and maintainable code, participating in code reviews, collaborating with cross-functional teams, mentoring junior developers.$70,000 – $90,000
Senior5-8 yearsLeading software development projects, architecting complex systems, providing technical guidance and mentoring, optimizing code performance, collaborating with stakeholders, participating in strategic decision-making.$90,000 – $120,000
Expert/Team Lead8+ yearsLeading a team of developers, managing project timelines and deliverables, driving technical innovation, conducting performance evaluations, collaborating with upper management, representing the team in cross-functional meetings.$120,000 – $150,000+

Pros & cons of HTML5

8 Pros of HTML5

  • Improved multimedia support: HTML5 provides native support for audio and video elements, eliminating the need for third-party plugins like Flash. This allows for a more seamless and efficient multimedia experience on websites.
  • Enhanced mobile support: HTML5 offers responsive design capabilities, making it easier for developers to create websites that adapt to different screen sizes and devices. This is crucial in today’s mobile-dominated world.
  • Better offline capabilities: HTML5 introduces offline storage options like localStorage and IndexedDB, allowing websites to store data locally on the user’s device. This enables users to access and interact with web applications even without an internet connection.
  • Improved performance: HTML5 includes features like Web Workers and Web Sockets, which allow for parallel processing and real-time communication between the browser and server. This leads to faster and more efficient web applications.
  • Cleaner code: HTML5 introduces semantic elements like

  • Geo-location support: HTML5 includes a geolocation API that allows websites to access the user’s location information. This opens up possibilities for location-based services and applications.
  • Increased accessibility: HTML5 provides new accessibility features like the
  • Improved cross-platform compatibility: HTML5 is supported by all major web browsers, making it easier for developers to create websites that work consistently across different platforms and devices.

8 Cons of HTML5

  • Browser compatibility issues: While HTML5 is widely supported, older browsers may not fully support all its features. This can lead to inconsistencies in how websites are displayed and functionality may be limited in certain browsers.
  • Security vulnerabilities: Like any technology, HTML5 is not immune to security risks. As HTML5 introduces new features and capabilities, it also opens up potential vulnerabilities that hackers can exploit.
  • Learning curve: HTML5 introduces new elements, APIs, and features that developers need to learn and understand. This can be time-consuming and may require additional training or resources.
  • Performance variations: While HTML5 improves performance in many cases, the actual performance of web applications can still vary depending on factors like the browser, device, and network conditions.
  • Audio and video format limitations: While HTML5 provides native support for audio and video, it has limitations in terms of supported formats. This can cause compatibility issues with certain media files.
  • Accessibility challenges: While HTML5 introduces accessibility features, ensuring full accessibility compliance still requires additional effort and attention to detail. Developers need to ensure proper implementation of accessibility features for all users.
  • Lack of offline support in some browsers: Although HTML5 introduces offline storage capabilities, not all browsers fully support this feature. This can limit the offline capabilities of web applications for users on certain browsers.
  • Compatibility with legacy systems: HTML5 may not be fully compatible with older systems or websites built on older technologies. This can pose challenges when integrating or migrating existing systems to HTML5.

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