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Serg K., Fiddler Developer

Lviv, Ukraine
Last Updated: 4 Jul 2023
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- 5 years with QA automation - Strong testing theory understanding. Defect life cycle and issue workflow understanding, Experience in creating and executing test cases. Reporting - Experience with data and BI tools - DevOps experience with CI/CD, pipelines, Docker, AWS, SQL

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Alyona, Fiddler Developer

Last Updated: 4 Jul 2023

• Bug’s life cycle, roles and activities in project team, positive/negative tests, smoke-testing, GUI, cross-browser(Internet Explorer; Mozilla Firefox; Safari; Opera; Google Chrome; Edge; Yandex Browser), compatibility, black-box, gray-box, functional, non- functional, regression testing, UI automation testing using Selenium IDE, Experience in manual mobile application testing on IOS and Android operating systems. • Knowledge of MS Dynamics 365. • Creation of test plans, test cases, test suite, checklists, bug reports. • Knowledge of Test Design technics. • Understanding of SDLC, methodologies and the difference between types of testing. • English Intermediate. • Available Full-time. • Ready to start next week. • No scheduled vacations within next 3 months.

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Aleksey S., Fiddler Developer

Morshyn, Ukraine
Last Updated: 11 Aug 2023

- More that 7+ years of professional expertise in the Information Technologies (IT) industry - Technical Lead of QA department - Experience in teaching and team leading - Experience in negotiation and communication with customer - Clear understanding of SDLC and testing process: Agile (Scrum, Kanban), Non-agile (Waterfall, V-model) - Practical experience in Agile/Scrum development process - Strong experience in working with test documentation (Test-plan, checklist, test-case, test-report etc.) - Good knowledge of different testing methods, techniques and types - Proficient with defect tracking and test management tools - Strong experience in testing of multiple iOS and Android-based smartphones and tablets - Ability to work independently, analytical mindset - Responsive Design testing experience - Upper-Intermediate English. - Availability starting from ASAP

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Vladimir Sh., Fiddler Developer

Last Updated: 6 Sep 2023

Highly experienced software engineer with over 10 years in QA, leading various QA teams and projects. - Expertise in testing automation tools Appium, Selenium, Cypress, WebDriver, and Protractor; - Experience with Java, Groovy, JavaScript, and TypeScript; - Skilled in creating test automation frameworks for Web UI/API/Mobile platforms; - Proficient in developing test documentation such as test plans, test cases, and incident reports; - Good understanding of systems development life cycle methodology and QA methodology and tools; - Strong knowledge of CI environment configuration and different operating systems (Windows, Linux); - Ability to quickly learn new technologies and approaches and implement them effectively.

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Aleksandr G., Fiddler Developer

Lutsk, Ukraine
Last Updated: 11 Aug 2023

- Experience more than 9+ of professional Software Testing - Good understanding of QA theory and deliverables - Clear understanding of SDLC and testing processes: Scrum, Waterfall, XP - Practical experience in Agile/Scrum development processes - Strong experience in working with QA documentation, knowledge in using support documentation - Good knowledge of different testing methods, techniques and types - Ability to apply test analysis and test design techniques - Proficient with defect tracking and test management tools - Strong experience in testing of multiple iOS and Android-based smartphones and tablets - Experience in web services testing and Responsive Design testing - Test automation experience - Upper-Intermediate English - Availability starting from 01/10/2023

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Roman Masniuk August 25, 2023

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!

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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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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.

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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.

Maryna Navo September 25, 2023

Крутий сервіс, зручна комунікація. Допомогли з закриттям мого питання на 200%

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If you urgently need a verified and qualified Fiddler developer, and resources for finding the right candidate are lacking, Upstaff is exactly the service you need. We approach the selection of Fiddler 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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Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched Fiddler 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 Fiddler developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

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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 Fiddler 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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Hiring Fiddler developers? Then you should know!

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Table of Contents

TOP 12 Facts about Fiddler

Facts about
  • Fiddler is a web debugging proxy tool that allows developers to capture, inspect, and manipulate HTTP and HTTPS traffic between a computer and the internet.
  • It was first released in 2003 by Eric Lawrence and has since become one of the most popular tools in the field of web development.
  • Fiddler is widely used by developers and testers to analyze and troubleshoot web traffic, as it provides detailed information about each request and response, including headers, cookies, and caching details.
  • With Fiddler, developers can easily view and modify HTTP requests and responses, simulate different network conditions, and track performance metrics such as latency and throughput.
  • It supports various platforms and operating systems, including Windows, macOS, and Linux.
  • Fiddler can be integrated with popular web browsers like Google Chrome, Mozilla Firefox, and Microsoft Edge, allowing developers to capture and analyze network traffic directly from their browser.
  • It offers powerful features like breakpoints, which allow developers to pause and modify HTTP requests and responses in real-time, making it an invaluable tool for debugging and testing web applications.
  • Fiddler also includes a powerful scripting engine that enables developers to automate repetitive tasks and extend its functionality through custom scripts written in languages like C# and JavaScript.
  • It provides advanced security features such as HTTPS decryption and certificate management, allowing developers to analyze encrypted traffic and debug issues related to SSL/TLS protocols.
  • Fiddler offers a wide range of extensibility options, including the ability to create custom inspectors, filters, and extensions, making it highly customizable and adaptable to various development workflows.
  • It has a large and active community of developers who contribute to its ongoing development and share tips, tricks, and extensions through forums, blogs, and online communities.
  • Fiddler is regularly updated with new features and improvements, ensuring that developers have access to the latest tools and techniques for web debugging and performance optimization.

Soft skills of a Fiddler Developer

Soft skills

Soft skills are essential for a Fiddler Developer to excel in their role and collaborate effectively with others. These skills enable them to communicate, adapt, and work well in a team environment. Here are the soft skills required for a Fiddler Developer at different levels:


  • Problem-solving: Ability to analyze and solve complex problems efficiently using Fiddler.
  • Attention to detail: Keen eye for detail to identify and resolve issues in web traffic.
  • Time management: Efficiently manage time to meet project deadlines and deliverables.
  • Communication: Effective verbal and written communication skills to collaborate with team members and stakeholders.
  • Adaptability: Ability to quickly adapt to new technologies and tools in the Fiddler ecosystem.


  • Leadership: Exhibit leadership qualities by guiding and mentoring junior developers in using Fiddler.
  • Critical thinking: Apply critical thinking skills to troubleshoot and optimize web traffic using Fiddler.
  • Collaboration: Work collaboratively with cross-functional teams to identify and resolve performance issues.
  • Organizational skills: Ability to prioritize tasks and manage multiple projects simultaneously.
  • Empathy: Understand and empathize with end-users to enhance the user experience using Fiddler.
  • Proactive: Take initiative to identify potential issues and implement proactive solutions.
  • Teamwork: Contribute effectively as a team member and foster a positive team environment.


  • Strategic thinking: Ability to think strategically and provide insights for performance optimization using Fiddler.
  • Project management: Lead and manage complex projects by coordinating with various stakeholders.
  • Influence: Influence and persuade stakeholders to adopt best practices using Fiddler.
  • Mentoring: Mentor and guide junior and mid-level developers in using Fiddler effectively.
  • Conflict resolution: Resolve conflicts and facilitate productive discussions within the team.
  • Presentation skills: Deliver effective presentations to communicate findings and recommendations.
  • Continuous learning: Stay updated with the latest trends and advancements in Fiddler and related technologies.

Expert/Team Lead

  • Strategic leadership: Provide strategic direction and leadership to the Fiddler development team.
  • Technical expertise: Possess in-depth knowledge and expertise in using Fiddler for advanced web traffic analysis.
  • Decision-making: Make informed decisions based on data analysis and insights from Fiddler.
  • Cross-functional collaboration: Collaborate effectively with other teams to integrate Fiddler into the development process.
  • Team management: Manage and motivate the Fiddler development team to achieve project goals.
  • Innovation: Drive innovation by exploring new ways to leverage Fiddler for performance optimization.
  • Client management: Engage with clients to understand their requirements and provide solutions using Fiddler.
  • Change management: Lead the team through organizational changes and adapt Fiddler to new environments.
  • Quality assurance: Ensure the quality and accuracy of web traffic analysis performed using Fiddler.
  • Problem-solving: Solve complex problems and provide technical guidance to the team.
  • Continuous improvement: Drive continuous improvement initiatives to enhance the Fiddler development process.

Pros & cons of Fiddler

Pros & cons

8 Pros of Fiddler

  • Fiddler provides powerful debugging and testing capabilities for web applications.
  • It allows developers to intercept, inspect, and modify HTTP and HTTPS traffic between a web browser and a server.
  • Fiddler offers a user-friendly interface with various useful features, such as session capturing, filtering, and highlighting.
  • It supports multiple platforms including Windows, macOS, and Linux, making it accessible to a wide range of developers.
  • Fiddler provides detailed information about HTTP requests and responses, allowing developers to analyze and troubleshoot network issues.
  • It allows developers to simulate different network conditions, such as latency and bandwidth restrictions, to test the performance of their web applications.
  • Fiddler offers powerful scripting capabilities, allowing developers to automate repetitive tasks and customize their debugging workflow.
  • It has a large and active community of users, providing a wealth of resources, tutorials, and extensions for further customization.

8 Cons of Fiddler

  • Fiddler can be overwhelming for beginners due to its extensive feature set and complex configuration options.
  • It requires some technical knowledge to effectively use and configure Fiddler for specific debugging scenarios.
  • Fiddler may introduce a slight overhead in terms of performance, as it intercepts and analyzes network traffic.
  • It may not be suitable for debugging certain types of applications, such as mobile apps or applications running on non-standard protocols.
  • Fiddler’s user interface can be cluttered and difficult to navigate, especially when dealing with a large number of captured sessions.
  • Configuring Fiddler to work with secure HTTPS traffic requires additional setup and certificate configuration.
  • Fiddler may not be compatible with all web browsers and may require additional configuration for some browsers.
  • While Fiddler offers powerful scripting capabilities, writing and debugging complex scripts can be time-consuming and challenging for some developers.

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

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior Developer0-2 yearsAssist in the development and maintenance of software applications under the supervision of senior developers. Collaborate with team members to understand requirements and deliver code that meets specifications. Participate in code reviews and debugging activities.$50,000 – $70,000
Middle Developer2-5 yearsDevelop and implement software solutions based on defined requirements. Take ownership of smaller modules or components within a larger system. Collaborate with cross-functional teams to integrate software components. Mentor junior developers and provide guidance on best practices.$70,000 – $90,000
Senior Developer5-10 yearsLead the design and development of complex software systems. Drive architectural decisions and provide technical leadership. Collaborate with stakeholders to gather requirements and translate them into technical solutions. Mentor and coach junior and middle developers. Conduct code reviews and ensure high-quality code delivery.$90,000 – $120,000
Expert/Team Lead Developer10+ yearsLead a team of developers and oversee the delivery of software projects. Provide technical guidance and mentorship to team members. Collaborate with product managers and stakeholders to define project scope and objectives. Drive continuous improvement initiatives and ensure adherence to coding standards and best practices.$120,000 – $150,000+

What are top Fiddler instruments and tools?

Instruments and tools
  • FiddlerCore: FiddlerCore is a powerful library that allows developers to embed Fiddler’s web debugging capabilities into their own applications. It provides a comprehensive set of APIs for capturing and analyzing HTTP/HTTPS traffic, making it an essential tool for building and testing web applications. FiddlerCore has been around since 2003 and is widely used by developers to troubleshoot and optimize their web applications.
  • Composer: Composer is a built-in tool in Fiddler that allows users to create and modify HTTP requests. It provides a user-friendly interface for composing custom requests, including support for various HTTP methods, headers, and request bodies. Composer is particularly useful for testing APIs and simulating different scenarios during development.
  • AutoResponder: AutoResponder is a powerful tool in Fiddler that allows users to create rules for intercepting and modifying HTTP responses. It enables developers to simulate different server responses, such as returning cached responses or injecting custom content. AutoResponder is widely used for testing and debugging web applications that rely on specific server responses.
  • Inspectors: Fiddler comes with several built-in inspectors that provide detailed information about HTTP traffic. These inspectors include the Raw Inspector, which displays the raw HTTP request and response, and the XML Inspector, which formats XML responses for easier readability. Inspectors are invaluable for analyzing and understanding the structure and content of HTTP traffic.
  • Scripting: Fiddler supports scripting using the FiddlerScript language, which allows users to automate tasks and extend the functionality of Fiddler. With FiddlerScript, developers can write custom rules, modify HTTP traffic on the fly, and integrate Fiddler with other tools and workflows. The scripting capabilities of Fiddler make it a versatile tool for advanced users who require customizations and automation.
  • Timeline Viewer: The Timeline Viewer in Fiddler provides a visual representation of the timing and sequence of HTTP requests and responses. It allows developers to easily identify performance bottlenecks, such as slow-loading resources or excessive round trips. The Timeline Viewer is widely used for performance analysis and optimization of web applications.
  • Statistics: Fiddler includes comprehensive statistics and metrics for analyzing HTTP traffic. It provides detailed information about request and response sizes, timing, caching, and various other performance indicators. The statistics feature in Fiddler enables developers to gain insights into the behavior and performance of their web applications.
  • Extensions: Fiddler has a thriving ecosystem of extensions developed by the community. These extensions add additional functionality and integrations to Fiddler, such as support for specific protocols or enhanced debugging capabilities. The extensibility of Fiddler allows users to tailor the tool to their specific needs and leverage the expertise of the community.

TOP 10 Fiddler Related Technologies

Related Technologies
  • Programming Languages

    The most popular programming languages for Fiddler software development are JavaScript, C#, and Python. JavaScript is widely used for front-end web development, while C# is often used for backend development and building desktop applications. Python is known for its simplicity and versatility, making it a popular choice for various projects.

  • Frameworks

    Frameworks provide a structured approach to software development and can significantly speed up the development process. For Fiddler software development, some popular frameworks include AngularJS, ASP.NET, and Django. AngularJS is a JavaScript framework for building dynamic web applications. ASP.NET is a framework for building scalable web applications using C#, while Django is a Python web framework known for its simplicity and robustness.

  • Version Control Systems

    Version control systems are essential for managing code changes and collaboration among developers. Git is the most widely used version control system in the software development industry. It offers features like branching, merging, and easy collaboration. Other popular version control systems include Mercurial and Subversion.

  • Integrated Development Environments (IDEs)

    IDEs provide developers with a comprehensive set of tools for writing, debugging, and testing code. Visual Studio is a popular IDE for Fiddler software development, especially when working with C# and .NET technologies. JetBrains’ PyCharm is widely used by Python developers, while WebStorm is popular for front-end web development.

  • Testing Frameworks

    Testing is a crucial part of software development to ensure the quality and reliability of the code. For Fiddler software development, popular testing frameworks include Jasmine for JavaScript, NUnit for C#, and pytest for Python. These frameworks provide a structured approach to writing and executing tests.

  • Containerization

    Containerization technologies like Docker have gained tremendous popularity in recent years. Docker allows developers to package their applications into containers, which can be easily deployed and run on different environments without any compatibility issues. It provides a consistent environment for software development and deployment.

  • Continuous Integration/Continuous Deployment (CI/CD) Tools

    CI/CD tools automate the process of building, testing, and deploying software. Jenkins is a widely used open-source CI/CD tool that integrates with various version control systems and provides a flexible and scalable solution. Other popular CI/CD tools include Travis CI and CircleCI.

How and where is Fiddler used?

How and where
Case NameCase Description
Debugging Web ApplicationsFiddler is widely used by developers for debugging web applications. It allows developers to intercept and inspect HTTP and HTTPS traffic between their web application and the server. By analyzing the requests and responses, developers can identify and fix issues such as incorrect headers, missing data, or server-side errors.
API Testing and MonitoringFiddler can be utilized for testing and monitoring APIs. It enables developers to capture API calls, inspect the request and response payloads, and analyze the performance of API requests. This helps in identifying any errors, performance bottlenecks, or security vulnerabilities in the API implementation.
Performance OptimizationDevelopers can leverage Fiddler to optimize the performance of their web applications. By analyzing the network traffic, they can identify slow-loading resources, unnecessary redirects, or excessive requests. This information helps in optimizing the application’s performance by reducing latency and improving page load times.
Security TestingFiddler can be used for security testing of web applications. It allows developers to intercept and analyze network traffic, including sensitive data such as passwords or authentication tokens. By inspecting the requests and responses, developers can identify potential security vulnerabilities, such as insecure communication channels or inadequate data encryption.
Cross-Domain TroubleshootingWhen developing web applications that interact with multiple domains or APIs, Fiddler can help troubleshoot cross-domain issues. It enables developers to inspect the HTTP headers and responses, identify any CORS (Cross-Origin Resource Sharing) errors, and ensure proper communication between different domains.
Caching AnalysisDevelopers can use Fiddler to analyze caching behavior in their web applications. By inspecting the HTTP headers, they can determine whether resources are being properly cached by the browser or server. This information helps in optimizing caching strategies and reducing unnecessary network requests.
Mobile App TestingFiddler can also be utilized for testing mobile applications. By configuring the device or emulator to use Fiddler as a proxy, developers can capture and analyze the HTTP traffic generated by the mobile app. This allows them to debug issues, monitor API calls, and analyze network performance directly from the mobile device.
Web ScrapingFiddler can be used for web scraping projects. By intercepting and analyzing the network traffic, developers can understand the structure of web pages, identify data sources, and extract relevant information. This can be particularly useful for tasks such as data mining, content aggregation, or automated testing.
Performance TestingWhen conducting performance testing of web applications, Fiddler can provide valuable insights. It allows developers to capture and analyze network traffic during load tests, identify performance bottlenecks, measure response times, and optimize the application’s scalability and performance.
Reverse Engineering APIsFiddler can assist in reverse engineering APIs. By intercepting API calls made by client applications, developers can analyze the request and response payloads, identify authentication mechanisms, and understand the underlying API endpoints and data structures. This knowledge can be leveraged to build compatible client applications or integrate with existing APIs.

Cases when Fiddler does not work

Does not work
  1. SSL/TLS encrypted traffic: Fiddler is unable to intercept and decrypt SSL/TLS encrypted traffic by default. This means that if you are trying to inspect or modify the content of HTTPS connections, Fiddler may not be able to capture the data.
  2. System proxy settings: Fiddler relies on the system proxy settings to capture and redirect network traffic. If your system proxy settings are configured to bypass Fiddler, it will not be able to intercept the traffic. Check your proxy settings to ensure that Fiddler is not being bypassed.
  3. Firewall or antivirus software: In some cases, firewall or antivirus software may interfere with Fiddler’s functionality. These security tools may block Fiddler’s ability to intercept network traffic or may flag it as suspicious behavior. If you suspect that your firewall or antivirus software is causing issues, try temporarily disabling them to see if Fiddler starts working.
  4. Incorrect configuration: Fiddler requires proper configuration to work correctly. If you have misconfigured Fiddler’s settings or options, it may not capture the desired traffic. Double-check your Fiddler settings to ensure that they are correctly configured for your specific use case.
  5. Operating system limitations: Fiddler is primarily designed to work on Windows operating systems. While there are alternative versions available for macOS and Linux, they may have limitations or compatibility issues compared to the Windows version. If you are using Fiddler on a non-Windows system, be aware of these limitations.

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