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Freelance Java Backend Developer Jobs in Claymont, DE

Sr. Java Backend Developer

Wilmington, DE · On-site

$49 - $63.50/hr

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

Java Developer(mid-level)

Wilmington, DE · On-site

$49.50 - $64/hr

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

Write clean, maintainable backend code in Java and Python, with an emphasis on performance and ... engineering solutions. Required Technical Skills Core Languages: Proficient in Java (Spring Boot ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

Full Stack Java Developer

Philadelphia, PA · On-site

$53 - $68.25/hr

The Developer will be part of a product team of designers and full-stack developers (Java back-end) developing a web and mobile application for use by the Front Line Associates & Managers in the ...

Sr. Backend Engineer

Media, PA · Remote

$90 - $105/hr

Senior Backend Software Engineer (Java/Go), Hybrid - Onsite 4 Days/Week. Start date is ASAP for this Contract position. Job Title: Senior Backend Software Engineer (Java/Go) Location-Type: Hybrid ...

Java Developer

Wilmington, DE · On-site

$49.50 - $64/hr

They are seeking a Full Stack Java Developer to design and build robust backend systems, collaborate with cross-functional teams, and deliver high-impact solutions for enterprise clients.

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Freelance Java Backend Developer information

See Claymont, DE salary details

$9

$53

$71

How much do freelance java backend developer jobs pay per hour?

As of Jul 8, 2026, the average hourly pay for freelance java backend developer in Claymont, DE is $53.30, according to ZipRecruiter salary data. Most workers in this role earn between $47.36 and $61.44 per hour, depending on experience, location, and employer.
What are the most commonly searched types of Java Backend Developer jobs in Claymont, DE? The most popular types of Java Backend Developer jobs in Claymont, DE are:
What cities near Claymont, DE are hiring for Freelance Java Backend Developer jobs? Cities near Claymont, DE with the most Freelance Java Backend Developer job openings:
Sr. Java Backend Developer

Sr. Java Backend Developer

Net Orbit

Wilmington, DE • On-site

$49 - $63.50/hr

Full-time

Re-posted 8 days ago


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