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Andrew B, Senior Frontend /Senior Full-Stack Developer

Last Updated: 4 Jul 2023

- 5 years of experience as a Middle React.js Developer - He has experience with web interfaces and react.js and node.js technologies. Experience with PWA on projects, also worked with PHP, C++, C#, and Android development. - Upper-Intermediate English - Available ASAP

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React   4 yr.


Node.js   4 yr.

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Valery N., Magento Frontend Engineer

Rivne, Ukraine
Last Updated: 4 Jul 2023

- Magento Frontend Developer with more than 3,5 years of experience. - PWA Experience of 5 months - E-commerce systems development. - Informational sites development. - Corporate portals development. - Upper- Intermediate English. - Available ASAP.

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Magento 2

Magento 2   4 yr.

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Cláudio M., Android Engineer

Last Updated: 14 Aug 2023

- 8+ years of experience with Android Development - 4+ years of experience with Kotlin - Upper-Intermediate English

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Android   8 yr.

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Pavel M, Middle React.js Developer

Last Updated: 4 Jul 2023

- 2+ years of experience as a Middle React.js Developer - He has experience working on an SSR application on React.js/Next.js/Node.js/TypeScript. Knowledge in building high-quality JS and react.js applications. Engaged in the approach to performance optimization tools. - Upper-Intermediate English - Available ASAP

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React   2 yr.



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Amir, React Native Engineer

Last Updated: 4 Jul 2023

- React/React Native Engineer with almost 6 years of professional experience - Experience with Amazon/Amplify/S3/Code push - Successfully developed both iOS and Android applications using React Native - Developing React/React Native apps that interface with Restful APIs - Experience with React/Redux/Third-Party API Integrations - Experience with GraphQL/Apollo - Upper Intermediate English - Available ASAP

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Yaroslav Kuntsevych
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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Henry Akwerigbe
Henry Akwerigbe
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 🙌🏽.
Vitalii Stalynskyi
Vitalii Stalynskyi
I have been working with Upstaff for over a year on a project related to landscape design and management of contractors in land design projects. During the project, we have done a lot of work on migrating the project to a multitenant architecture and are currently working on new features from the backlog. When we started this project, the hiring processes were organized well. Everything went smoothly, and we were able to start working quickly. Payments always come on time, and there is always support from managers. All issues are resolved quickly. Overall, I am very happy with my experience working with Upstaff, and I recommend them to anyone looking for a new project. They are a reliable company that provides great projects and conditions. I highly recommend them to anyone looking for a partner for their next project.
Владислав «Sheepbar» Баранов
Владислав «Sheepbar» Баранов
We've been with Upstaff for over 2 years, finding great long-term PHP and Android projects for our available developers. The support is constant, and payments are always on time. Upstaff's efficient processes have made our experience satisfying and their reliable assistance has been invaluable.
Roman Masniuk
Roman Masniuk
I worked with Upstaff engineers for over 2 years, and my experience with them was great. We deployed several individual contributors to clients' implementations and put up two teams of upstaff engineers. Managers' understanding of tech and engineering is head and shoulders above other agencies. They have a solid selection of engineers, each time presented strong candidates. They were able to address our needs and resolve things very fast. Managers and devs were responsive and proactive. Great experience!
Yanina Antipova
Yanina Antipova
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!)
Наталья Кравцова
Наталья Кравцова
I discovered an exciting and well-paying project on Upstaff, and I couldn't be happier with my experience. Upstaff's platform is a gem for freelancers like me. It not only connects you with intriguing projects but also ensures fair compensation and a seamless work environment. If you're a programmer seeking quality opportunities, I highly recommend Upstaff.
Leaving a review to express how delighted I am to have found such a great side gig here. The project is intriguing, and I'm really enjoying the team dynamics. I'm also quite satisfied with the compensation aspect. It's crucial to feel valued for the work you put in. Overall, I'm grateful for the opportunity to contribute to this project and share my expertise. I'm thrilled to give a shoutout and recommendation to anyone seeking an engaging and rewarding work opportunity.

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FAQs about PWA Development

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If you urgently need a verified and qualified PWA developer, and resources for finding the right candidate are lacking, UPSTAFF is exactly the service you need. We approach the selection of PWA 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 PWA 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 PWA 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 PWA 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 PWA 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 PWA 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 PWA 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 PWA 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 PWA 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

Cases when PWA does not work

  1. Unsupported Browsers: While Progressive Web Apps (PWAs) are designed to work across multiple platforms and browsers, there are still some older browsers that do not support the necessary web technologies. For example, Internet Explorer versions older than IE11 do not fully support the Service Worker API, which is a key component of PWAs.
  2. Low or No Internet Connection: PWAs heavily rely on internet connectivity to deliver real-time updates and fetch data from the server. If a user is in an area with poor or no internet connection, the PWA may not function properly. Offline capabilities of PWAs may be limited, and certain features may not be accessible without a stable internet connection.
  3. Device Limitations: While PWAs are designed to be responsive and work across various devices, there may be limitations based on the device capabilities. For example, older devices with limited processing power or memory may struggle to run resource-intensive PWAs smoothly. Additionally, certain hardware features may not be accessible through a PWA, such as fingerprint scanners or device-specific sensors.
  4. Security Restrictions: Some organizations and institutions have strict security policies that limit access to certain web technologies or restrict the installation of applications outside of official app stores. In such cases, users may not be able to install or use PWAs on their devices.
  5. Limited Native Integration: Although PWAs can provide a native-like experience, they still have limitations compared to fully native applications. Native apps have deeper integration with the operating system and can access a wider range of device functionalities. PWAs may not be able to utilize certain hardware features or provide seamless integration with other apps on the device.

Hard skills of a PWA Developer

Hard skills of a PWA Developer:


  • HTML/CSS: Proficiency in creating semantically structured HTML and CSS stylesheets.
  • JavaScript: Basic understanding of JavaScript and its core concepts.
  • Responsive Design: Ability to create web applications that work seamlessly across different devices and screen sizes.
  • Git: Familiarity with version control systems, particularly Git, for code collaboration and management.
  • Debugging: Skill in identifying and fixing common bugs and issues in PWA development.


  • JavaScript Frameworks: Experience with popular JavaScript frameworks like React, Angular, or Vue.js for building robust PWAs.
  • Progressive Web App Architecture: Knowledge of PWA architecture principles and best practices.
  • API Integration: Ability to integrate data from external APIs into PWA applications.
  • Performance Optimization: Proficiency in optimizing PWAs for speed and performance.
  • Testing: Experience with unit testing and end-to-end testing frameworks for ensuring the quality of PWAs.
  • UI/UX Design: Understanding of user interface and user experience design principles for creating intuitive and visually appealing PWAs.
  • SEO: Knowledge of search engine optimization techniques to improve the visibility of PWAs in search engine rankings.


  • Server-Side Development: Proficiency in server-side technologies such as Node.js and Express.js for building scalable and efficient PWAs.
  • Database Management: Experience with database systems like MongoDB or MySQL for storing and retrieving data in PWAs.
  • Authentication and Authorization: Knowledge of implementing secure user authentication and authorization mechanisms in PWAs.
  • Progressive Enhancement: Ability to implement progressive enhancement techniques to ensure PWAs work even in low-connectivity or low-capability environments.
  • Code Review: Skill in reviewing code and providing constructive feedback to junior developers.
  • Project Management: Experience in leading PWA development projects, managing timelines, and coordinating with stakeholders.
  • Continuous Integration/Deployment: Familiarity with CI/CD pipelines for automating the build, test, and deployment processes in PWA development.

Expert/Team Lead

  • Architecture Design: Ability to design scalable and maintainable PWA architectures.
  • Performance Monitoring: Proficiency in monitoring and analyzing the performance of PWAs using tools like Google Lighthouse or WebPageTest.
  • Scalability and Load Balancing: Knowledge of scaling PWAs to handle high traffic and implementing load balancing techniques.
  • Security: Expertise in implementing security measures to protect PWAs from common vulnerabilities and attacks.
  • Code Optimization: Skill in optimizing the codebase of PWAs for better performance and maintainability.
  • Team Leadership: Experience in leading a team of PWA developers, providing guidance, and fostering a collaborative work environment.
  • Industry Trends: Stay updated with the latest trends and advancements in PWA development and recommend innovative solutions.
  • Client Communication: Ability to effectively communicate with clients, understand their requirements, and propose suitable PWA solutions.
  • Code Refactoring: Proficiency in refactoring existing code to improve its structure, readability, and maintainability.
  • Error Handling: Knowledge of implementing robust error handling and logging mechanisms in PWAs.
  • Technical Documentation: Skill in creating comprehensive technical documentation for PWAs, including architecture diagrams and API documentation.

How and where is PWA used?

Case NameCase Description
1. Twitter LiteTwitter Lite is a Progressive Web App (PWA) that allows users to access Twitter’s features and content through a lightweight and fast web application. By utilizing PWA development, Twitter was able to provide a seamless user experience with offline capabilities and push notifications, even on low-end devices and slow networks.
2. AliExpressAliExpress, one of the world’s largest online marketplaces, adopted PWA development to address the challenges of slow network connections and limited storage space on mobile devices. The PWA version of AliExpress offers fast loading times, smooth browsing, and the ability to add the app to the home screen, providing a native app-like experience for users without the need for installation.
3. StarbucksStarbucks leveraged PWA development to enhance its mobile ordering experience. With the Starbucks PWA, customers can order and pay for their favorite drinks in advance, reducing wait times in stores. The PWA also allows users to browse through the menu, customize their orders, and access their order history, even when offline.
4. PinterestPinterest, a popular visual discovery platform, utilized PWA development to improve user engagement and increase conversions. The PWA version of Pinterest offers fast loading times, smooth scrolling, and the ability to save pins directly from the browser, providing a seamless and immersive experience for users.
5. UberUber, the renowned ride-hailing service, embraced PWA development to cater to users in areas with limited network connectivity. The Uber PWA allows users to book rides, track their drivers, and view trip details even when offline. This ensures that users can access essential functionalities regardless of network availability.
6. ForbesForbes, a leading global media company, implemented PWA development to improve their mobile web experience. The Forbes PWA offers fast loading times, offline access to previously visited articles, and push notifications for breaking news. This has resulted in increased user engagement and a significant reduction in bounce rates.
7. MakeMyTripMakeMyTrip, an online travel company, adopted PWA development to enhance the user experience for travelers. The MakeMyTrip PWA allows users to book flights, hotels, and holiday packages, even with slow network connections. The PWA also provides offline access to booking details and sends push notifications for travel updates, ensuring a seamless travel planning experience.

TOP 10 PWA Related Technologies

  • JavaScript

    JavaScript is the most fundamental language for PWA software development. It is widely supported and offers a vast ecosystem of libraries and frameworks.

  • React

    React is a popular JavaScript library for building user interfaces. It provides a component-based approach and enables developers to create reusable UI components for their PWAs.

  • Vue.js

    Vue.js is a progressive JavaScript framework for building user interfaces. It offers a simple and intuitive API, making it easy to develop PWAs with reactive components.

  • Angular

    Angular is a comprehensive JavaScript framework for building web applications, including PWAs. It provides a full-featured development environment and follows the component-based architecture.

  • Service Workers

    Service Workers are a core technology for PWAs. They allow developers to cache assets, handle offline scenarios, and provide a seamless user experience even with limited or no internet connectivity.

  • IndexedDB

    IndexedDB is a low-level API for client-side storage in web browsers. It enables PWAs to store structured data locally, providing offline capabilities and improving performance.

  • Push Notifications

    Push Notifications are crucial for engaging users in PWAs. They allow developers to send notifications to users even when the PWA is not actively being used, helping to drive user retention and re-engagement.

TOP 15 Tech facts and history of creation and versions about PWA Development

  • PWA stands for Progressive Web Apps.
  • PWAs were first introduced by Google in 2015.
  • The term “Progressive Web Apps” was coined by Alex Russell and Frances Berriman.
  • PWAs combine the best features of web and mobile apps.
  • They are built using web technologies such as HTML, CSS, and JavaScript.
  • PWAs can be accessed through a browser without the need for installation.
  • They offer offline functionality and can work in low or no network conditions.
  • PWAs can be added to the home screen of a device, just like native apps.
  • They have the ability to send push notifications to users.
  • PWAs are responsive and can adapt to different screen sizes and orientations.
  • They provide a seamless user experience with smooth animations and transitions.
  • PWAs can be easily updated without requiring users to download and install updates.
  • They have improved security compared to traditional web apps.
  • PWAs are gaining popularity among businesses due to their cost-effectiveness and cross-platform compatibility.
  • Major companies like Twitter, Pinterest, and Uber have adopted PWAs.

Pros & cons of PWA

8 Pros of PWA

  • Improved user experience: Progressive Web Apps (PWAs) offer a seamless and fast user experience, similar to native mobile apps.
  • Offline functionality: PWAs have the ability to work offline or with a poor internet connection, allowing users to access content and perform tasks without interruption.
  • Easy installation: PWAs can be easily installed on a user’s device without going through an app store, eliminating the need for complex installation processes.
  • Platform independence: PWAs are built using web technologies like HTML, CSS, and JavaScript, making them compatible with multiple platforms and devices.
  • Lower development costs: Developing a PWA requires less time and resources compared to building separate native apps for different platforms.
  • Faster updates: PWAs can be updated instantly without requiring users to download and install updates from an app store.
  • Increased discoverability: PWAs can be discovered through search engines, linking, and sharing, making it easier for users to find and access the app.
  • Reduced storage space: PWAs do not take up a significant amount of storage space on a user’s device, unlike native apps.

8 Cons of PWA

  • Limited functionality: PWAs may not be able to access all the device capabilities and functionalities that native apps can.
  • Dependency on browser support: The performance and features of PWAs can vary depending on the browser being used, which may limit the user experience.
  • No app store presence: Unlike native apps, PWAs do not have a dedicated presence in app stores, which can impact visibility and discoverability.
  • Security concerns: PWAs may have security vulnerabilities due to their reliance on web technologies and the potential for cross-site scripting attacks.
  • Less familiar user interface: PWAs may have a different user interface compared to native apps, which can cause confusion or dissatisfaction among users.
  • Cannot utilize device-specific features: PWAs may not be able to fully utilize device-specific features like biometric authentication or advanced camera functionalities.
  • Performance limitations: While PWAs have improved performance, they may still face limitations in terms of processing power and resource usage.
  • Dependency on internet connection: While PWAs can work offline to a certain extent, they still require an internet connection for certain functionalities and content updates.

Soft skills of a PWA Developer

Soft skills are essential for a PWA Developer to succeed in their role. These skills go beyond technical expertise and are crucial for effective communication, collaboration, and problem-solving. Here are the soft skills required at different levels of experience:


  • Adaptability: Ability to quickly learn and adapt to new technologies and frameworks.
  • Communication: Strong verbal and written communication skills to effectively convey ideas and collaborate with team members.
  • Problem-solving: Analytical mindset and the ability to identify and solve technical challenges.
  • Time management: Efficiently manage tasks and meet deadlines.
  • Teamwork: Work collaboratively with others, contribute to team discussions, and provide support when needed.


  • Leadership: Take ownership of tasks and projects, guide and mentor junior developers.
  • Critical thinking: Ability to analyze complex problems and develop innovative solutions.
  • Empathy: Understand and empathize with users’ needs and preferences to deliver user-friendly PWAs.
  • Attention to detail: Meticulous approach to ensure high-quality code and optimal performance.
  • Conflict resolution: Effectively resolve conflicts and facilitate constructive discussions within the team.
  • Adaptability: Quickly adapt to changing project requirements and priorities.
  • Time management: Prioritize tasks effectively and manage time efficiently to meet project deadlines.


  • Strategic thinking: Ability to align PWA development with business goals and make informed decisions.
  • Project management: Experience in managing complex projects, including planning, coordination, and resource allocation.
  • Mentoring: Guide and mentor junior and middle-level developers, sharing best practices and knowledge.
  • Collaboration: Foster collaboration across teams, ensuring effective communication and knowledge sharing.
  • Problem-solving: Expertise in identifying and resolving complex technical challenges.
  • Innovation: Drive innovation in PWA development, keeping up with industry trends and emerging technologies.
  • Adaptability: Easily adapt to new technologies and frameworks, staying ahead of the curve.
  • Time management: Efficiently manage multiple projects and tasks, ensuring timely delivery.

Expert/Team Lead

  • Strategic vision: Develop and communicate a long-term vision for PWA development within the organization.
  • Team leadership: Lead and inspire a team of developers, providing guidance and support.
  • Decision-making: Make informed decisions considering technical, business, and user requirements.
  • Influence: Effectively influence stakeholders, advocating for best practices and driving change.
  • Continuous improvement: Foster a culture of continuous learning and improvement within the team.
  • Technical expertise: Deep understanding of PWA development, frameworks, and industry best practices.
  • Collaboration: Collaborate with cross-functional teams, including designers, UX experts, and product managers.
  • Time management: Efficiently manage resources, budgets, and project timelines.
  • Strategic thinking: Align PWA development with business objectives and anticipate future needs.
  • Innovation: Drive innovation in PWA development, exploring new technologies and approaches.
  • Mentoring: Mentor and develop the skills of team members, empowering them to reach their full potential.

What are top PWA instruments and tools?

  • React: React is a JavaScript library for building user interfaces. It was developed by Facebook and released in 2013. React is widely used for building Progressive Web Apps (PWAs) due to its component-based architecture and virtual DOM rendering. It allows developers to create fast and interactive user interfaces, making it a popular choice for building PWAs. React has a large community and a vast ecosystem of libraries and tools that make development easier and more efficient.
  • Vue.js: Vue.js is a progressive JavaScript framework for building user interfaces. It was created by Evan You and released in 2014. Vue.js is known for its simplicity and ease of integration with existing projects. It offers features like declarative rendering, component-based architecture, and reactive data binding, making it a suitable choice for building PWAs. Vue.js has gained popularity in recent years and has a growing community of developers.
  • Angular: Angular is a TypeScript-based open-source framework for building web applications. It was developed by Google and released in 2010. Angular provides a comprehensive set of tools and features for building PWAs, including a powerful template system, dependency injection, and a robust CLI. It follows the component-based architecture and offers features like data binding, routing, and state management. Angular has been widely adopted by enterprises and has a mature ecosystem.
  • Ionic: Ionic is a popular open-source framework for building cross-platform mobile and web applications. It was initially released in 2013. Ionic combines the power of Angular with a set of UI components and tools specifically designed for building PWAs. Ionic provides a seamless user experience across different platforms and devices. It offers features like native-like UI components, pre-built app templates, and easy deployment to app stores. Ionic has a large community and is widely used for building PWAs.
  • Polymer: Polymer is a JavaScript library for building web components. It was developed by Google and released in 2013. Polymer allows developers to create reusable and encapsulated web components, which can be used to build PWAs. It provides a set of tools and features for creating custom elements, data binding, and component composition. Polymer is known for its performance and flexibility in building PWAs. It has been used by companies like YouTube, Netflix, and Google for building their web applications.
  • Workbox: Workbox is a set of JavaScript libraries and tools for building offline-ready web applications. It was developed by Google and released in 2017. Workbox provides a set of caching strategies, service worker management, and offline asset management. It simplifies the process of caching and serving static assets, handling network requests, and managing the service worker lifecycle. Workbox is widely used for adding offline capabilities to PWAs and improving their performance.
  • Webpack: Webpack is a popular module bundler for JavaScript applications. It was released in 2012. Webpack allows developers to bundle and optimize their code, manage dependencies, and generate static assets for PWAs. It offers features like code splitting, tree shaking, and hot module replacement, which help improve the performance and loading speed of PWAs. Webpack has a large ecosystem of plugins and loaders that make it flexible and customizable for different project requirements.
  • Lighthouse: Lighthouse is an open-source tool developed by Google for auditing and improving the quality of web pages and PWAs. It was released in 2016. Lighthouse performs a series of tests and provides a detailed report on various aspects of a PWA, such as performance, accessibility, best practices, and SEO. It helps developers identify and fix issues that can affect the user experience and performance of a PWA. Lighthouse is widely used by developers and organizations to ensure their PWAs meet the required standards and perform optimally.

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