Hire The Top 1% Freelance Java Developers

Flexiple is a network of top Java developers, engineers, and architects with hourly rates ranging from $30 to $100. Join 100+ teams who have hired Java developers from Flexiple for a few weeks to a few years!
JEFF LEI

JEFF LEI

Senior Java Developer

PREVIOUSLY AT

phData
BEYNI HAMZA

BEYNI HAMZA

Senior Java Developer

PREVIOUSLY AT

Sofrecom
LAFIF GULIYEV

LAFIF GULIYEV

Java Developer

PREVIOUSLY AT

Ericsson
VASILE CATANA

VASILE CATANA

Java Developer

PREVIOUSLY AT

Continental
TAKSHAY PATEL

TAKSHAY PATEL

Senior Java Developer

PREVIOUSLY AT

Cybage

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 alternate options.

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.

Tanu V, Founder (#1 Salesforce Leads App)

Work With Flexiple's Expert Java Developers!

Be a short-term or a long-term project, don't compromise on the quality of talent you work with. Flexiple handpicks only the Top 1% through a 6-stage screening process.
  • JEFF LEI
    JEFF LEI
    Java Javascript ReactJS

    Jeff is an adept Java developer with 9 years of web development experience. Over the last 3 years, he has worked as a remote engineer ... in many companies based in Europe and America. He is an expert in several JS frameworks and has developed applications for a variety of industries. Read more

    Previously at phData

    Hire Jeff
  • KAPILDEV NEUPANE
    KAPILDEV NEUPANE
    Java VanillaJS Kotlin Rest

    Kapil has worked with startups like Pactum, Sunly, PayQin, Virality Content, and Deliberate to bring their ideas to life. He also helped with hiring when ... startups needed Tech Stack used: Spring Boot, Javascript, Typescript, ReactJS, NodeJS, ordpress, HTML, CSS, SCSS. Read more

    Previously at deliberate AI

    Hire Kapildev
  • ICHIRO IWAI
    ICHIRO IWAI
    Java Swift Objective C Android

    Ichiro is an experienced mobile app developer with 10 years of experience in the IT industry. He is an expert in the development of mobile ... applications for both iOS and Android platforms. He is capable of developing apps using native languages like Objective C, Swift, Java and Kotlin. Read more

    Previously at Modacity Inc

    Hire Ichiro
  • ARSALAN MEHMOOD
    ARSALAN MEHMOOD
    Java Android Flutter

    Arsalan is a mobile app developer with experience of 8 years in the software industry. He is an Android app specialist with an in-depth knowledge ... of the technologies like Java, Kotlin, Flutter, Firebase, MySQL, etc. He has excellent communication skills with the ability to convey ideas clearly. Read more

    Previously at Alpha Games Lab

    Hire Arsalan
  • RAHUL GHOSE
    RAHUL GHOSE
    JAVA PYTHON REACT

    Rahul, a brilliant senior developer, has substantial experience of over 7 years in the software domain. He has worked across multiple product companies like Flywheel ... and an esteemed service company, Goldman Sachs. He was the software engineering vice-president of the technology division of Goldman Sachs. Proficient in Java, Python, React and more, he has developed across domains like commutation, fashion, communication & collaboration, etc. A lucid communicator, Rahul has set out as a freelance Java developer. Read more

    Previously at Goldman Sachs

    Hire Rahul
  • BEYNI HAMZA
    BEYNI HAMZA
    Java AngularJS AWS

    Beyni is a full stack developer with 6 years of experience in the software sphere. He has developed a variety of applications for industries like ... HR, parking management, telecom, etc. He has the combined experience of working with both product and service-based companies. He is adept in technologies like Java, Angular, AWS, etc. He is good at communicating with clients and has worked as an individual contributor and as a team lead as well. Read more

    Previously at Sofrecom

    Hire Beyni
  • LAFIF GULIYEV
    LAFIF GULIYEV
    Java Spring Scala

    Lafif is a Java Spring developer with 3 years of experience in the software development industry. He is a Computer Science Master's degree holder and ... specializes in Java and Spring among other technologies. Included in the many feathers in his cap are his employment with companies across industries including the likes of Ericsson. He has worked as an individual contributor on his projects. Read more

    Previously at Ericsson

    Hire Lafif
  • VASILE CATANA
    VASILE CATANA
    Java Python

    Vasile is a young, talented, enthusiastic software engineer with solid experience and a versatile skill set. He is proficient with multiple languages and frameworks such ... as Python, Java, C++, Docker, and many more. He is a creative professional who has good communication skills. He has a knack for picking up new tech. With a strong work ethic, Vasile is focused on helping you reach your goal. Read more

    Previously at Continental

    Hire Vasile

Flexiple Helps You Hire Quality Developers, Handpicked for You

  • Work only with the best

    Our developers are selected through a 6-stage screening process. As a result, our developers have an average of 5-years industry experience and are ready to immediately contribute on projects.
  • Work with Role-specific Developers

    Save time and energy lost in manually sifting through profiles. Our solutions expert along with our Director of Technology will handpick developers who are a perfect match for your requirement.
  • Work Risk-free & Start within 2 Days

    With immense confidence in the quality of our developers and the accuracy of our recommendations, we are happy to offer you a 1-week trial where you pay only if you are satisfied.

Find the perfect developer for your team at the right price

  • Individual Contributor

    $
    /year
    $30-50
    /hour
    • 1-3 years of experience
    • Mostly worked on a single stack
    • Top Individual Contributor
  • Multi-faceted Contributor

    $
    /year
    $50-80
    /hour
    • 3-7 years of experience
    • Expertise in multiple stacks
    • Worked on niche skills
    • Mentors Junior Developers
  • Leader & Diverse Contributor

    $
    /year
    $80+
    /hour
    • 7-10+ years of experience
    • Worked across stacks, products
    • Multiple niche skills
    • Led multiple teams in the past

How We Select the Top 1%

45.4%pass rate

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.

14.6%pass rate

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.

3.1%pass rate

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.

1.5%pass rate

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.

1.2%pass rate

Splendid reviews in background check

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

Consistent exemplary performance

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

Hire Freelance Java Developers within 48 Hours!

Our simple process gets you working with the right freelancer quickly and seamlessly

Don't Just Take Our Word For It!

(Y-Combinator S12 and Andreessen Horowitz-backed Company)

Quality product launched on schedule by a team of 8 engineers

"Flexiple helped us hire quality developers across technologies - Node, Rails, PHP, Python. They spent a good amount of time understanding our requirements, resulting in accurate recommendations and quick ramp up by developers. We also found them to be much more affordable than other alternatives for the same level of quality."

Narayan Vyas,

Senior Product manager, Plivo Inc

(Incubated at the European Space Agency)

Helped set up and scale tech team on demand

"Flexiple has exceeded our expectations with their focus on customer satisfaction! The freelancers are brilliant at what they do and have made an immense impact. Highly recommended :)"

Henning Grimm,

Founder, Aquaplot

(Acquired by Unicorn, Hike Messenger)

Saved 30% costs with 2 software products delivered

“Overall Flexiple brought in high-level of transparency with extremely quick turnarounds in the hiring process at a significantly lower cost than any alternate options we had considered.”

Kislay Shashwat,

VP Finance, CREO

('17 NYU Graduates)

Found a perfect new member for its globally distributed team

"Working with Flexiple has provided us with partners who are providing us with the required technical support for our growth and success!"

Esther Hersh,

Co-founder, Peblio Inc

(Y-Combinator S18)

Hired the first remote engineer to work directly with the CTO

"It has been great working with Flexiple for hiring highly talented and hardworking folks on contract. We were looking for a suitable developer on the back-end and we got to know Ankur through Flexiple. We are very happy with the commitment and skills he brings to the job and we will be working with Flexiple going forward as well after this positive experience. I recommend them highly for any freelancing talent you are looking to hire!"

Neil Shah,

Chief of Staff, Prodigal Tech

(#1 Lead Routing App for Salesforce)

Helped scale the product with a team of engineers

"Flexiple has been instrumental in helping us grow at a fast pace. Their vetting process for engineers is top notch and they were able to connect us with quality talent quickly. The team put great emphasis in understanding our requirements and getting to know us which ensured that we were matched with folks who were a great fit not only technically but also culturally."

Tanu V,

Founder, Power Router

(Acquired by Reliance for $100 million)

Delivered 2 high quality products forming a long partnership

"The engagement with Flexiple and their community members has helped us get work done in a timely manner and helped us go above and beyond."

Swapan R,

Co-founder, Haptik

(Acquired by PayU for $70 million)

Built their first remote tech team of a frontend and backend engineer

"Highly responsive team with prompt support and willingness to go the extra mile. Powered by technically brilliant personnel on board, we have happy results – all this at an affordable price!"

Sajith N,

Product Manager, Wibmo Inc
  • How to Hire a Great Freelance Java Developer?

  • Java is an object-oriented programming language developed by James Gosling and his colleagues at Sun Microsystems in the early 1990s. There has been a significant increase in the number of Java developers over the years. It went from 1.5 Million in 2003 to 7 Million in 2007 when Java became an open-source. The year 2020 marks the 25th anniversary of Java, and it has still managed to maintain its position in the top 3 most popular programming languages. A lot of enterprise companies use Java for their server-side programming because it is exceptionally robust and user-friendly.

    If you’re looking for a freelance Java developer, this guide will come handy. We’ve included everything you need to know about the hiring process.

    But before we get into the fundamentals of hiring a freelance Java developer, let’s delve into some interesting facts about Java.

    We have broken the sections into the following parts:
    1. Let's introduce Java to you.
    2. Why is Java widespread?
    3. What are the tools used for Java development?
    4. Writing the Job Description to hire a Java developer
    5. Interview Questions for hiring a Java developer
    - Basic Questions
    - Advanced Questions
    - Data Structures/Algo Questions




    1. Let's introduce Java to you

    • Origin story: Java was initially developed by James and his colleagues(a.k.a, the ‘green team’) for digital devices like set-top boxes, television, etc. It was called ‘Greentalk’ and ‘Oak’ before Gosling came up with the name ‘Java.’ This project was created to implement a virtual machine that is easier than C/C++.

    • Widely popular: According to Daxx’s LinkedIn research, the USA has the highest number of Java programmers- 63K, followed by the UK with almost 14K Java developers.

    • Top companies using Java: Top companies like Google, Instagram, Airbnb, Pinterest, Slack, Spotify, etc. use Java.

    • Other trivia: In 1995, Time magazine featured Java as one of the Ten Best Products of 1995.

    • 2. Why is Java widespread?

      • User-friendly: Java has an English-like syntax, which makes it easy to learn. It is easy to advance from Core Java to Advanced Java for someone who has a functional knowledge of C and C++.
      • Robust: Java is robust as it utilizes strong memory management. No use of pointers bypasses security dilemmas. It also has an automatic garbage collector, which runs on the Java Virtual Machine(JVM) to eliminate objects which are not being accepted by a Java application anymore.

      3. What are the tools used for Java development?

      The following are some of the tools used by Java developers at various stages of development:

      1. JDK

      Oracle made Java Development Kit or JDK, an easy-to-use tool that includes the Runtime Environment, Compiler, and APIs for Java development. Both beginners, as well as experienced developers, can use this tool with ease.

      2. Java IDEs

      A few of the most popular Java IDEs or Integrated Development Environments are

      • IntelliJIDEA - developed by JetBrains, designed to maximize productivity.
      • NetBeans - a free and open-source IDE by Apache
      • Eclipse - this Java IDE is preferred due to its extensive assistance.

      3. Java Testing Tools

      • JUnit - Simple unit testing tool that makes it easy to write repeatable tests
      • JMeter - Load testing tool that offers a range of services for running tests on the cloud.

      4. JavaDoc

      This is a documentation generator for the Java programming language, making it easier for other Java developers to work on a given project.

      5. Jenkins

      Jenkins is great for continuous integration and is used by Java developers for deploying apps on the internet. It can also be used for continuous delivery with ease.


      4. Writing the Job Description to hire a Java developer

      Below are some key points that we at Flexiple have learned through trial and error - a process of filtering through over 15,000 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 framework: All frameworks have their peculiarities and nuances. While good Java developers can pick up other frameworks, 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 would have first-hand experience of everything right from how 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, freelancer should be able to effectively communicate to ensure a streamlined execution of all work.

      • You can check out a more detailed job description for Java developers here.


        5. Interview Questions for hiring a Java developer

        Now that you have made a quality JD, it can still be tricky to evaluate the skills of your applicants. To help you with that, we have created a pool of questions that a good Java developer should be comfortable with. You can check out some related questions here: Java, Hibernate.
        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 but we've focused on its significance in Java. 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

  • How are whitespaces removed from a string in Java?

    The Java strip() is a string method that removes all leading and trailing whitespaces. Strip() uses the Character.isWhitespace() method internally to check for whitespaces.

    This method identifies whitespaces using Unicodes and hence it is the recommended method to remove whitespaces.

    stripLeading() and stripTrailing() are alternatives in case you are only looking to remove leading or trailing whitespaces respectively.

    The code below is an example of the Java strip() method

    String s = "  flexiple ";
            
    s = s.strip();
            
    System.out.println(s);
    
    
    
  • Write a code snippet to implement a Fibonacci series using recursion?


    The code snippet below implements the Fibonacci series using recursion which is a common Java interview question.
    public class FibonacciNumbers {
        public static int fibonacci(int n) {
            if (n <= 1)
                return n;
            return fibonacci(n - 1) + fibonacci(n - 2);
        }
    
        public static void main(String args[]) {
            int n = 10;
            System.out.println(fibonacci(n));
        }
    }

    B. Advanced concepts

  • How do you reverse a string in Java without using the reverse() methods?


    Java does not come out of the box with the reverse() method although the reverse() method does exist in a few libraries such as StringBuffer or StringBuilder. Hence, reversing an array has become a common interview question.

    Following is a simple algorithm that can be used to reverse an array.
        public class StringReverse {
    
        public static void main(String[] args) {
    
            String str = "Flexiple";
            System.out.println(reverse(str));
        }
    
        public static String reverse(String in) {
            if (in == null)
                throw new IllegalArgumentException("Null is not valid”);
    
            StringBuilder out = new StringBuilder();
    
            char[] chars = in.toCharArray();
    
            for (int i = chars.length - 1; i >= 0; i--)
                out.append(chars[i]);
    
            return out.toString();
        }
    }
    
  • What causes a deadlock scenario? Write code to create a deadlock.


    A deadlock scenario is caused when two threads require the same locks to execute.

    These scenarios occur when both threads have obtained one lock and are waiting to obtain the other lock. However, since both threads wait for the other to execute they block each other causing a deadlock.

    Multi Threaded programs suffer from deadlocks because the synchronized keyword is used to make the methods thread-safe. This means that only one thread can lock and use the synchronized method. Other threads have to wait for the current thread to complete.

    The code below creates two threads that are in a deadlock.

    class Util
    {
        static void sleep(long millis)
        {
            try
            {
                Thread.sleep(millis);
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
        }
    }
    class Shared
    {
        synchronized void test1(Shared s2)
        {
            System.out.println("test1-begin");
            Util.sleep(1000);
    
            s2.test2();
            System.out.println("test1-end");
        }
    
        synchronized void test2()
        {
            System.out.println("test2-begin");
            Util.sleep(1000);
    
            System.out.println("test2-end");
        }
    }
    
    class Thread1 extends Thread
    {
        private Shared s1;
        private Shared s2;
    
        public Thread1(Shared s1, Shared s2)
        {
            this.s1 = s1;
            this.s2 = s2;
        }
    
        @Override
        public void run()
        {
            s1.test1(s2);
        }
    }
    
    class Thread2 extends Thread
    {
        private Shared s1;
        private Shared s2;
    
        public Thread2(Shared s1, Shared s2)
        {
            this.s1 = s1;
            this.s2 = s2;
        }
    
        @Override
        public void run()
        {
            s2.test2(s1);
        }
    }
    
    public class Deadlock
    {
        public static void main(String[] args)
        {
            Shared s1 = new Shared();
    
            Shared s2 = new Shared();
    
            Thread1 t1 = new Thread1(s1, s2);
            t1.start();
    
            Thread2 t2 = new Thread2(s1, s2);
            t2.start();
    
            Util.sleep(2000);
        }
    }

    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.


    import java.util.Scanner;
    public class Palindrome {
        public static void main (String[] args) {
            String original, reverse = "";
     Scanner in = new Scanner(System.in);
           int length;
            System.out.println("Enter a number or a string");
            original = in.nextLine();
            length = original.length();
            for (int i =length -1; i>;=0; i--) {
                reverse = reverse + original.charAt(i);
            }
            System.out.println("The reverse is: " +reverse);
    
            if(original.equals(reverse))
                System.out.println("The string is a palindrome");
            else
                System.out.println("The stringis not a palindrome");
    
        }
    }
    
    Output:
    For String- Enter a number or a string
    sam
    The reverse is: mas
    The string is not a palindrome
    
    For Number-Enter a number or a string
    99
    The reverse is: 99
    The number is a palindrome 
  • 3. What will the output of the following code be?


    class Test {
    public static void main(String args[])
        {
            String str1 = new String("Hello World");
            String str2 = new String("Hello World");
    
            String str3 = "Hello World";
            String str4 = "Hello World";
    
            int a = 0, b = 0, c = 0;
    
            if (str3 == str4)
                a = 1;
            else
                a = 2;
    
            if (str1.equals(str3))
                b = 1;
            else
                b = 2;
    
            if (str1 == str4)
                c = 1;
            else
                c = 2;
            System.out.println("a= " + a + " b= " + b + " c= " + c);
        }
    }
    

    A. a=2 b=1 c=2
    B. a=2 b=2 c=2
    C. a=1 b=2 c=1
    D. a=1 b=1 c=2

    D. a=1 b=1 c=2 because a new memory is created when we make an object with the help of the ‘new’ keyword, 
    and the reference variable contains the memory location. 
    Here the memory is created with the same string twice, but since we are comparing objects and not strings, 
    the object will point to a different memory location and so they are not equal. 

    Parting thoughts on hiring a Java Developer


    That is everything you need to know about hiring a freelance Java developer. As discussed, it isn't easy to find a quality freelance Java 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 Java 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:
    1. Note your project requirements and hire accordingly. Do not go for the lowest or the highest-paid developer.
    2. Don’t hire without vetting- consider asking questions right from the basics to advanced to logical questions.
    3. Look for companies like Flexiple that help you find the perfect fit.

    Happy hiring! :)

Try a Top Quality Java Developer for 7 Days.
Pay Only If Satisfied.