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Freelance Java Backend Developer Jobs in Colorado

Design and develop RESTful and GraphQL APIs using Java and Scala * Build event-driven services and ... Implement backend systems using frameworks like Spring Boot, Akka HTTP, or Play * Ensure reliable ...

Java Developer

Denver, CO · On-site

$52.50 - $68/hr

... backend services, and cloud-based solutions. This role requires strong expertise in the Java/Spring ecosystem, AWS cloud services, REST API development, and modern DevOps practices. The ideal ...

Java Developer

Denver, CO · On-site

$52.50 - $68/hr

Backend Java Developer * Spring * NoSQL/MySQL * Cassandar (plus) * Candidates with the soft skills (passionate, pro-active, personable) Additional Information Prashant Sharma, Recruitment Specialist ...

Java Software Engineer

Aurora, CO · On-site

$52.75 - $72.25/hr

SIMILAR CAREER TITLESJava Developer, Backend Developer, Full Stack Developer, Software Engineer, Application Developer, Java Application Developer, Web Developer, Enterprise Software Engineer ...

Java Developer

Denver, CO · On-site

$52.50 - $68/hr

Java Developer Contractor About the Role We are seeking an experienced Java Developer Contractor to support the design, development, and maintenance of web applications, backend services, and cloud ...

Java Software Engineer

Aurora, CO · On-site

$52.75 - $72.25/hr

SIMILAR CAREER TITLES Java Developer, Backend Developer, Full Stack Developer, Software Engineer, Application Developer, Java Application Developer, Web Developer, Enterprise Software Engineer ...

Java Developer

Denver, CO · On-site

$60/hr

About the Role We are seeking an experienced Java Developer Contractor to support the design, development, and maintenance of web applications, backend services, and cloud-based solutions. This role ...

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

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Freelance Java Backend Developer information

What are the most commonly searched types of Java Backend Developer jobs in Colorado? The most popular types of Java Backend Developer jobs in Colorado are:
What cities in Colorado are hiring for Freelance Java Backend Developer jobs? Cities in Colorado with the most Freelance Java Backend Developer job openings:

Scala Developer

CosQube INC

Denver, CO • On-site

Contractor

Re-posted 18 days ago


Job description

Greetings from Cosqube,
Hope your day is Treating you well!
We are immediately hiring for the below given position, if you think you are right suitable resources for this opportunity based on your skills and expertise, please do share your updated resume along with contact details we will be happy to discuss in detail about this role.
 
Project Details:
Role: Scala Developer
Location: Denver, US
Duration:12+ Months Contract with Extension
Employment Type: C2C/C2H/W2
Interview Criteria: MS teams Video
Job Description:

 
  • Design and develop RESTful and GraphQL APIs using Java and Scala
  • Build event-driven services and microservices that produce and consume messages via Apache Kafka
  • Implement backend systems using frameworks like Spring Boot, Akka HTTP, or Play
  • Ensure reliable, fault-tolerant Kafka integration, including schema validation, error handling, and retries
  • Collaborate with frontend and platform teams to define clear API contracts and integration patterns
  • Contribute to code quality, testing, and CI/CD automation
  • Monitor, troubleshoot, and optimize performance of services and API endpoints
  • Strong programming experience with Scala (Akka, Play, or Cats/Scalaz) and Java (8+)
  • Hands-on experience with Apache Kafka (producer/consumer APIs, Avro/Protobuf, topic design)
  • Experience building and consuming RESTful APIs and optionally GraphQL APIs
  • Knowledge of functional programming and reactive patterns
  • Familiarity with Spring Boot, asynchronous programming, and dependency injection
  • Strong unit and integration testing practices
  • Comfortable with Git, CI/CD pipelines, and API security (OAuth2, JWT)

 Nice to Have

  • Kafka Streams or Akka Streams experience
  • Exposure to Kafka Connect, Schema Registry, and message validation patterns
  • Knowledge of Docker, Kubernetes, and cloud-native app development
  • Familiarity with API gateways (e.g., Kong, Apigee) or service mesh (e.g., Istio)