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Build your dream team with Backend developers, engineers and architects from Flexiple, handpicked through a 6-stage screening process.
RICHA VERMA

RICHA VERMA

Senior Backend Developer

WORKED AT

Plivo
Know more about Richa
JEFF LEI

JEFF LEI

Senior Backend Developer

WORKED AT

phData
Know more about Jeff
MATTIAS MARTENS

MATTIAS MARTENS

Senior Backend Developer

WORKED AT

Asurion
Know more about Mattias
SAMUEL APPIAH-KUBI

SAMUEL APPIAH-KUBI

Backend Developer

WORKED AT

Microsoft
Know more about Samuel
STAVROS KAPARELOS

STAVROS KAPARELOS

Senior Backend Developer

WORKED AT

IBM
Know more about Stavros

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Flexiple spent good amount of time understanding our requirements, resulting in accurate recommendations and quick ramp up by quality developers.
Narayan Vyas, Senior PM (YC S12)
Overall Flexiple brought in high-level of transparency with quick turnarounds in the hiring process at a significantly lower cost than any other alternate options out there.
Esther Hersh, Co-founder ('17 NYU Grad)
Flexiple has been instrumental in helping us grow at a fast pace. Their vetting process for engineers is top notch and they connected us with quality talent quickly.
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Top Backend Developers are Handpicked by Flexiple

  • RICHA VERMA
    RICHA VERMA
    RUBY ON RAILS REACT NODE

    Richa is a freelance backend developer with 5+ years of software development experience across both large companies and fast-growing tech startups. While being a Rails ... Richa is a freelance backend developer with 5+ years of software development experience across both large companies and fast-growing tech startups. While being a Rails loyalist, she has also slowly developed a liking for NodeJS and has hence also dabbled in JS frameworks. A graduate from IIT Kanpur (India's premier tech institute), she wishes to explore the latest technologies while enjoying her off-time travelling. Read MoreRead Less

    Worked at Plivo

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  • KOMAL AHLUWALIA
    KOMAL AHLUWALIA
    JAVA NODE

    Komal is a software engineer with 5+ years of experience in developing scalable and concurrent business applications in Java, NodeJS, and AngularJS. Further, being exposed ... Komal is a software engineer with 5+ years of experience in developing scalable and concurrent business applications in Java, NodeJS, and AngularJS. Further, being exposed to the agile methodology gives her the ability to adapt to new technologies, learn, master and coach. And Komal has found working as a freelance backend engineer more interesting recently. Read MoreRead Less

    Worked at Thoughtworks

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  • SURBHI AIRAN
    SURBHI AIRAN
    REACT NODE

    Surbhi has 4+ years of experience in software development and has worked in building apps across React Native, NodeJS and ReactJS. She has been focussing ... Surbhi has 4+ years of experience in software development and has worked in building apps across React Native, NodeJS and ReactJS. She has been focussing more on the backend development and working as freelance engineer on remote contracts for the past couple of years and possesses good communications skills (verbal and written) and is very responsive. Read MoreRead Less

    Worked at DXC Tech

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  • ROHAN CHHABRA
    ROHAN CHHABRA
    PHP ANGULAR

    Rohan has 5+ years of experience working in fast-growing startups across the globe. Primarily a backend developer who has worked on a couple of PHP-based ... Rohan has 5+ years of experience working in fast-growing startups across the globe. Primarily a backend developer who has worked on a couple of PHP-based Enterprise applications extensively. Though being a backend developer working in freelance projects, he has good exposure to the frontend technologies and has good working experience in Docker and Kubernetes as well. He believes in writing code which is maintainable, and easily scalable. Read MoreRead Less

    Worked at Resolute Property Tax Solutions

    Get a Quote
  • ANKUR GUPTA
    ANKUR GUPTA
    PYTHON RUBY ON RAILS C++

    Ankur, is a freelance backend engineer with around 10 years of experience in the software development domain. He started his career at Microsoft and over ... Ankur, is a freelance backend engineer with around 10 years of experience in the software development domain. He started his career at Microsoft and over the years has worked for other top companies including Craftsvilla. Moreover, he is a skilled architect and his entrepreneurial spirit has led him to build a startup too. Ankur’s areas of expertise are diverse and the prominent technologies of that are Ruby on Rails, Python, C/ C++, AWS, Azure and Power BI. Read MoreRead Less

    Worked at Microsoft

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  • STAVROS KAPARELOS
    STAVROS KAPARELOS
    NodeJS Python

    Stavros is a backend focused full stack developer with 8 years of experience in the software industry. He is an expert in technologies like JavaScript ... Stavros is a backend focused full stack developer with 8 years of experience in the software industry. He is an expert in technologies like JavaScript and its frameworks like NodeJS, VueJS, ReactJS and also with Python. He has developed applications that are being used in a variety of industries including pharmaceutical, transport, etc. He is a remote work experienced professional with the experience of working with service and product-based companies. Read MoreRead Less

    Worked at IBM

    Get a Quote
  • MATTIAS MARTENS
    MATTIAS MARTENS
    Java NodeJS Scala

    Mattias has 5+ years of experience developing single-page web applications in a variety of JavaScript frameworks. He has expertise in 3D graphics, computer vision for ... Mattias has 5+ years of experience developing single-page web applications in a variety of JavaScript frameworks. He has expertise in 3D graphics, computer vision for AI, machine learning, algorithm complexity, and software engineering. Read MoreRead Less

    Worked at Asurion

    Get a Quote
  • SAMUEL APPIAH-KUBI
    SAMUEL APPIAH-KUBI
    Django Java Python

    Samuel is a young full stack developer in the software industry. He has a Bachelor's in Computer Science & Statistics from Duke University and is ... Samuel is a young full stack developer in the software industry. He has a Bachelor's in Computer Science & Statistics from Duke University and is a very proficient developer. He has a strong knack for picking up new technology and has hands-on experience in developing mobile applications. With strong communication skills and an exemplary work ethic, Samuel is a passionate developer, driven to find the best solution. Read MoreRead Less

    Worked at Microsoft

    Get a Quote
  • Get access to 103 vetted Backend engineers

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Depth in past work

Flexiple Developers are reviewed on their experience and complexity of products built. Those who display depth and have worked on end-to-end projects are given an introductory call.

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Good communication and motivation

Over a call, the developer’s ability to communicate in an articulate manner is tested. A deeper understanding of the candidate’s technical experience and also motivation to freelance is achieved.

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Strong technical abilities

Over one or more F2F interviews, the developer’s involvement and performance in building complex software products are assessed. This sets the platform to delve deeper into technology-specific discussions.

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Keen problem solving and coding

Developers' mental agility and problem-solving abilities are tested through a coding test involving algorithmic as well as skill-specific problems. A mixture of live evaluation and timed coding tests is used.

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The live experience of working with developers is verified by reaching out to past clients and/or employers. Inputs on various qualitative factors such as reliability, punctuality, communication and responsiveness are received.

1%pass rate

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Performance during each engagement is continually assessed. Our developers are expected to maintain Flexiple standards across all engagements with our customers.

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Frequently Asked Questions

  • How To Find The Best Backend Developers For Hire?

  • Backend developers work on the server-side development of the website. Unlike front-end development that is limited to HTML for markup, CSS for presentation, and JavaScript for scripting, Backend development allows you to pretty much do anything as long as you can send data via an HTML request. While front-end developers get all the glory, arguably, Backend developers contribute more to the logic of the code. The most used Backend programming languages are Java, Ruby, Python, and PHP.

    If you’re looking to hire Backend developers for your company, this guide is going to help you find the perfect fit. We’ve included everything you need to know about hiring a freelance remote Backend developer.

    1. Let's introduce Backend development to you

    • Origin story: Earlier, a programmer was responsible for both, the frontend and backend set of operations. It was after Randy Schmid introduced full-stack development in 2008 that the two different streams of development came into the picture, the frontend and backend development.
    • Widely popular: According to Free Code Camp, backend developers make up 12.2% of developers as compared to frontend developers that hold 5.8%. Full-stack developers have the highest count: 28%.
    • Top languages used for backend development: According to Web directions, the most used backend programming language is PHP(64%), followed by Python(15%), Ruby(14%), and Java(12%).
    • 2. Why is Backend widespread?

      • Facilitates information exchange: Backend development consists of code that’s not visible to the users. This code is responsible for storing, validating and passing data stored in the backend to the client front. In simpler words, it adds utility to each frontend functionality.
      • Runs in various environments: Nowadays, businesses deploy their websites and web apps in different environments. Some choose to implement it on the server while some want cloud. Some combine both to increase scalability and performance. Backend development takes care of hosting websites in different environments.

      3. What are the tools used by Backend developers?

      The following are tools commonly used by backend developers to build and deeply code. While each language would have specialized tools, these find uses across languages.

      1. Version control tools

      These tools track and log the changes made to a system. Version control is done via Git repositories which track all the changes made to a particular file and saves them in a repository. This helps streamline the development process.

      Tools used for version control include:

      • GitHub - GitHub is a repo that lets you host Git projects. Teams can collaborate and view the entire code changes history.
      • GitLab - This has a lot of useful features including Continuous Integration through which you can test and deliver your code files.

      2. IDE/Code Editor

      IDEs or Integrated Development Environments consist of all the basic tools needed to write and test the code developers write.

      Some of the most popular IDEs are:

      • a) Visual Studio Code - equipped with a broad array of dev tools which makes it easy to write, navigate and fix code files fast
      • b) Atom - free and open-source text editor developed by GitHub, great for early as well as veteran users.

      3. Issue tracking

      These tools record incoming cases and requests and monitor their state from start to end. Jira and Trello are some commonly used issue tracking tools.

      4. API platforms

      API platforms are used by backend developers to build, share and test their APIs. Postman, Testfully, and Insomnia are well-known names among API platforms.

      5. PaaS

      Cloud Platforms as a Service are used by backend developers to work entirely on the cloud - from development to deployment. Some popular tools in this category are Heroku and Digital Ocean.

      4. Writing the job description to hire backend developers

      Below are some key points that we at Flexiple have learned through trial and error - a process of filtering through over 15,000 developers. You can use these in your process to hire Backend developers.

      • Years of software development experience: Be specific about the technology you’re looking for and the number of years of experience needed. A proxy to years of experience can be the number of production-level apps worked on.
      • Expertise in a specific language: All languages have their peculiarities and nuances. While good backend developers can pick up other languages, it’s a plus point to hire a developer who already has expertise in it.
      • Type of products built in the past: Based on the type of product you are trying to build - social network, SAAS product, etc. - you can prioritize certain developers over others.
      • Exposure to specific industries: Developers who have built products in certain industries will already know key aspects of laying the foundation for a great product and will be able to predict possible problems.
      • Experience working remotely: Hiring someone who has worked remotely in the past is an added advantage as they have front-hand experience of everything right from how the contracts work to communication and from timelines to deliverables.
      • Strong communication: An essential thing to look at when hiring a freelancer is excellent communication skills. Since all the interaction happens online, a freelancer should be able to effectively communicate to ensure a streamlined execution of all work

      You can check out a more detailed backend developer job description here.

      5. Interview Questions to hire Backend developers

      Now that you have made a quality JD, it can still be tricky to evaluate the skills of your applicants when you hire Backend developers. To help you with that, we have created a pool of questions that a good Backend developer should be comfortable with.

      It is important to note that the ability to answer these questions doesn't imply that you have a top quality candidate. But it definitely is a big step in that direction. You can check out some related interview questions on these pages: MySQL, Rest API

      It is important to note that the ability to answer these questions doesn't imply that you have a top quality candidate. But it definitely is a big step in that direction.

      To help you navigate through these questions, we’ve categorized the interview questions in 3 parts:

      A. Basic concepts: Includes all basic concepts used across languages. This section will give you an understanding of how strong their programming foundation is.

      B. Advanced concepts: Includes all concepts that someone with higher expertise should know.

      C. DS/Algorithm questions: To test the logical capability of the candidate.

      A. Basic concepts

  • What are Sessions in Hibernate?

    A session is used to establish and maintain the connection between the application and the database. Sessions are designed to be lightweight and only instantiated whenever data is required from the database.

    Session objects are not thread-safe and hence it is not a good practice to have them always opened. Additionally, Session can be used to retrieve, store or delete data from the database.

  • What is YAML in Spring Boot? Why is it used?

    Spring boot YAML can also be used to define properties and is an alternative to the application.properties file. Whenever the SnakeYAML library is in your classpath, the SpringApplication class automatically supports YAML as an alternative to properties.

    B. Advanced concepts

  • What are the different types of classes in C#?

    Classes are used widely while working with C#. It comes with 4 different types of classes. 

    • Static Class: Static classes contain static members, methods, and constructors. Static classes do not allow new objects to be created. Static classes are sealed, hence you cannot inherit a static class from another class.
    • Partial Class: A partial class allows users to split the functionality of a class across the same file or even multiple files. During compilation, all instances are combined and treated as one. Partial classes are defined using the partial keyword. Splitting a class allows multiple developers to work with the same class simultaneously. However, keep in mind that if any instance of the class is declared sealed, abstract, or base, the whole class is declared with the same type.
    • Abstract Class: Abstract classes are restricted classes that cannot be used to create objects. However, an abstract class must contain at least one abstract method. These methods do not have a body and are declared inside the class only. The abstract keyword is used to define an abstract class. The purpose of an abstract class is to provide a blueprint for derived classes and set some rules on what the derived classes must implement when they inherit an abstract class.
    • Sealed Class: Sealed classes restrict users from using inheritance, preventing the user from inheriting another class from it. Sealed classes are defined using the sealed keyword. Given the inheritance attribute has been taken away, sealed classes work best when used with a class inheriting static members. 
  • What does the forEach() method in Java do? Explain with an example.

    forEach() is a method that is used to iterate over objects in Java. However, unlike other loops, a loop counter is not declared or initialized but rather a variable is passed as an iterable.

    Hence, forEach() is commonly used with arrays or collection classes.

    Syntax

       for (type var : array) 
    { 
        statements using var;
    }

    Example Using forEach():

     class ExampleForEach   
    {
        public static void main(String[] arg)
        {
            {
                int[] scores = { 10, 13, 9, 11, 11};
                
                int highest_score = maximum(scores);
                System.out.println(highest_scores);
            }
        }
        public static int maximum(int[] numbers)
        {
            int max = numbers[0];
            
            // for each loop
            for (int n : numbers)
            {
                if (n > max)
                {
                    max = n;
                }
            }
        return max;
        }
    }

    C. Data Structure/ Algorithm

  • 1. Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct order. Note that an empty string is also considered valid.

    class ValidParenthesesFunc {
        func isValid(_ s: String) -> Bool {
            var stc = [Character]()
    
            for char in s {
                if char == "(" || char == "[" || char == "{" {
                    stc.append(char)
                } else if char == ")" {
                    guard stc.count != 0 && stc.removeLast() == "(" else {
                        return false
                    }
                } else if char == "]" {
                    guard stc.count != 0 && stc.removeLast() == "[" else {
                        return false
                    }
                } else if char == "}" {
                    guard stc.count != 0 && stc.removeLast() == "{" else {
                        return false
                    }
                }
            }
            return stc.isEmpty
        }
    }
    
    The above code will input 0(false). 
  • 2.  Write a program to find whether a string or number is palindrome or not.

    function palindrome(myString){
        var removeChar = myString.replace(/[^A-Z0-9]/ig, "").toLowerCase();
        var checkPalindrome = removeChar.split('').reverse().join('');
            if(removeChar === checkPalindrome){
              document.write("<div>"+ myString + " is a Palindrome<div>");
            }else{
              document.write("<div>" + myString + " is not a Palindrome <div>");
            }
    }
    palindrome('"Oh who was it I saw, oh who?"')
    palindrome('"Madam"')
    palindrome('"Star Wars"')
    palindrome('"7,10,7,8,9"')
    
    The output of the above code will be: 
    
    "Oh who was it I saw, oh who?" is a Palindrome
    "Madam" is a Palindrome
    "Star Wars" is not a Palindrome.
    "7,10,7,8,9" is not a Palindrome.
  • 3. What will the output of the following code be?

    var x = 10;
    var y = 5;
    var z = 3;
    if (x / y / z)
         document.write("hi");
    else
        document.write("hello");

    a) hi
    b) hello
    c) error
    d) no output

    The answer is A, the floating-point division in JS returns a non zero value = 0.66 which evaluates to 
    true and outputs ‘hi’.

    Hire Backend developers - parting thoughts

    That is everything you need to know about hiring a freelance Backend developer. As discussed, it isn't easy to find a quality freelance Backend developer but this guide makes the process easier for you. To offload the entire hiring process, reach out to us at Flexiple. We've designed a high-quality, 6-step screening process to find the top 1%, freelance developers. You can find the best freelance Backend developers here. We've already served over a hundred clients, earning great reviews for the quality of service.

    Lastly, to quickly summarize it for you:

    • Note your project requirements and hire accordingly. Do not go for the lowest or the highest-paid developer.
    • Don’t hire without vetting- consider asking questions right from the basics to advanced to logical questions.
    • Look for companies like Flexiple that help you find the perfect fit.
    • That is everything you need to know if you want to hire Backend developers. Happy hiring! :)

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