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Freelance Java Back End Developer Jobs in Philadelphia, PA

Net Orbit

Sr. Java Backend Developer

Wilmington, DE · On-site

$49 - $63.50/hr

Java Backend Developer • Java Developer - Preferable with Java 1.8 (java 8 features) experience • Advanced knowledge and experience developing and working with relational databases such as Sybase ...

Net Orbit

Java Developer(mid-level)

Wilmington, DE · On-site

$49.50 - $64/hr

Java Backend Developer • Java Developer - Preferable with Java 1.8 (java 8 features) experience • Advanced knowledge and experience developing and working with relational databases such as Sybase ...

Netorbit

Java Developer(mid-level)

Wilmington, DE · On-site

$49.50 - $64/hr

Java Backend Developer • Java Developer - Preferable with Java 1.8 (java 8 features) experience • Advanced knowledge and experience developing and working with relational databases such as Sybase ...

Purple Drive Technologies

Back-end developer

Mount Laurel, NJ · On-site

$119.30K - $155K/yr

Overview: Back-End Developer (Java) Role Overview We are seeking a skilled Back-End Developer with strong expertise in Java and Spring Boot to design, develop, and maintain high-performance backend ...

PKR

Senior Java Backend Engineer

Philadelphia, PA · Remote

$10 - $100/hr

What Our Client Needs A Senior Java Engineer to design, build, and scale cloud-native services that ... and DevOps teams to improve CI/CD and observability • Participate in code reviews, design ...

BI-Commercial

Java FSD

Wilmington, DE · On-site

$49.50 - $64/hr

Java FSD with AWS An FSD/FSPE has an "end to end product" mindset - design, implementation, testing and deployment, and adds an additional skill (s) on top of traditional front/back-end developer ...

Donato Technologies, Inc

Java FSD

Wilmington, DE · On-site

$49.50 - $64/hr

... front/back-end developer role * Design and developer application using Core Java * Design and ... developer application using J2EE. Experience in J2EE design patterns * Create/consume Rest APIs ...

Donato Technologies, Inc

Java FSD

Wilmington, DE · On-site

$49.50 - $64/hr

... front/back-end developer role * Design and developer application using Core Java * Design and ... developer application using J2EE. Experience in J2EE design patterns * Create/consume Rest APIs ...

Donato Technologies, Inc

Java FSD with AWS

Wilmington, DE · On-site

$49.50 - $64/hr

... back-end developer role Design and developer application using Core Java Design and developer application using J2EE. Experience in J2EE design patterns Create/consume Rest APIs & Microservices ...

Hirekeyz Inc

Java FSD with AWS

Wilmington, DE · On-site

$49.50 - $64/hr

... back-end developer role Design and developer application using Core Java Design and developer application using J2EE. Experience in J2EE design patterns Create/consume Rest APIs & Microservices ...

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Freelance Java Back End Developer information

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$10

$55

$73

How much do freelance java back end developer jobs pay per hour?

As of May 28, 2026, the average hourly pay for freelance java back end developer in Philadelphia, PA is $55.13, according to ZipRecruiter salary data. Most workers in this role earn between $48.99 and $63.56 per hour, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a Freelance Java Back End Developer, and why are they important?

To thrive as a Freelance Java Back End Developer, you need strong proficiency in Java, object-oriented programming, RESTful API design, and experience with frameworks like Spring or Hibernate, typically supported by a relevant degree or proven project portfolio. Familiarity with version control systems (such as Git), build tools (like Maven or Gradle), cloud platforms, and continuous integration/continuous deployment (CI/CD) pipelines is highly valued. Outstanding problem-solving abilities, self-motivation, and effective client communication set top freelancers apart. These skills ensure you can deliver robust, maintainable solutions independently and build lasting client relationships.

What are some common challenges faced by Freelance Java Back End Developers when working with multiple clients simultaneously?

Freelance Java Back End Developers often juggle several projects at once, which can present challenges in time management, prioritizing tasks, and aligning with different client expectations. Each client may use distinct tech stacks, communication tools, and development processes, requiring adaptability and strong organizational skills. Clear communication, setting realistic deadlines, and using project management tools can help freelancers maintain quality and meet deliverables across diverse projects.

What does a Freelance Java Back End Developer do?

A Freelance Java Back End Developer is a software professional who specializes in building and maintaining the server-side logic of web applications using the Java programming language. They work independently on a contract basis for various clients, handling tasks such as developing APIs, managing databases, and ensuring the performance and security of the application’s back end. Their responsibilities often include collaborating with front-end developers, integrating third-party services, and troubleshooting server-side issues. Freelancers in this role can work remotely or onsite, offering flexibility to both clients and developers.

What is the difference between Freelance Java Back End Developer vs Freelance Java Software Engineer?

AspectFreelance Java Back End DeveloperFreelance Java Software Engineer
CredentialsJava certifications, experience in backend frameworksJava certifications, broader software development skills
Work EnvironmentRemote, project-based, client-specificRemote or on-site, project or product-focused
Industry UsagePrimarily in backend development projectsInvolved in full software development lifecycle
Search & Comparison IntentFocus on backend Java skillsBroader software development expertise

While both roles involve Java skills, a Freelance Java Back End Developer specializes in server-side development, focusing on backend systems. A Freelance Java Software Engineer may have a broader scope, including full-stack or application development, often requiring additional skills beyond backend work.

What are the most commonly searched types of Java Back End Developer jobs in Philadelphia, PA? The most popular types of Java Back End Developer jobs in Philadelphia, PA are:
What are popular job titles related to Freelance Java Back End Developer jobs in Philadelphia, PA? For Freelance Java Back End Developer jobs in Philadelphia, PA, the most frequently searched job titles are:
What job categories do people searching Freelance Java Back End Developer jobs in Philadelphia, PA look for? The top searched job categories for Freelance Java Back End Developer jobs in Philadelphia, PA are:
Freelance Java Back End Developer jobs near you
Infographic showing various Freelance Java Back End Developer job openings in Philadelphia, PA as of May 2026, with employment types broken down into 57% Full Time, and 43% Contract. Highlights an 79% In-person, and 21% Remote job distribution, with an average salary of $114,664 per year, or $55.1 per hour.
Sr. Java Backend Developer

Sr. Java Backend Developer

Net Orbit

Wilmington, DE • On-site

$49 - $63.50/hr

Full-time

This job post has expired 1 day ago. Applications are no longer accepted.

Job description

Sr. Java Developer
Wilmington, DE/NYC/Atlanta, GA
Need resumes. Resource with 10-15 years hands on and preferably able to lead teams. Working with distributed systems
• Strong Java programming skills
• Minimum of 10 years practical software development experience
• Robust object-oriented design pattern knowledge and implementation experience using Java; Java Backend Developer
• Java Developer - Preferable with Java 1.8 (java 8 features) experience
• Advanced knowledge and experience developing and working with relational databases such as Sybase/MySQL
• Experience with multi-tier application architecture and high performance distributed and in-memory caching solutions
• Strong understanding of data modeling techniques
• Working knowledge of building and deploying distributed systems is mandatory
• Experience with cloud technologies (e.g., Kubernetes, Docker, OpenStack) a plus
Must Have
Core/OOPS
• OOPs Concepts & Patterns
• Java Keywords - Static, Final, volatile, synchronized, transient, this super etc.
• Constructors
• Abstract Classes and Interfaces
• Dependency Injection
• Exceptions - Checked, Unchecked
Generics
• Collections - List, Map, Set
• Data Structures & Collections
Concurrency
• Multithreading and Synchronization
• Non-Blocking Collections/Utilities
Spring Framework:
• Spring Core(must)
• Spring Data
Misc.
• GIT
• Maven/Gradle
• Design Patterns
• Junit/Testing (Version 4+)
• Caching In general
Database / ORM
• Cursors (Good)
• SQL Queries - Inner Outer Joins, Group By, Having (Must)
• Stored Procedures (Good have)
• Triggers (Good)
• Hibernate
Good To Have
• IO & Serialization
• Memory management - Heap Dump/Thread dump /GC/Memory Tuning
• Spring Boot
• Messaging - JMS/Queues, Kafka / Cassandra
Web Applications
• Angular/TypeScript
• JSP / Servlets
• Mark-up Languages like XML and JSON
• Service Oriented Architecture / Web Services - SOAP / REST / gRPC
• Web Frameworks like Struts / Spring
• Web Technologies like HTML, CSS, JavaScript and JQuery

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