Senior Java Backend Engineer
Greenwood Village, CO
Category: Development
Industry: Communications
Reference ID: JN -012026-105234
Date Posted: 01/26/2026
Shortcut: http://careers.eliassen.com/sIjZ8T
Description:
Hybrid 4 onsite / 1 work from home in Greenwood Village, CO
The organization is hiring a backend engineer to implement Java 17 and Spring Boot services, design REST and GraphQL APIs, and support data-intensive workflows across PostgreSQL and Apache Cassandra. The role will contribute to event-driven architectures using Kafka and improve performance with Redis while ensuring high-quality, tested code and close collaboration with cross-functional teams.
Due to client requirements, applicants must be willing and able to work on a w2 basis. For our w2 consultants, we offer a great benefits package that includes Medical, Dental, and Vision benefits, 401k with company matching, and life insurance.
Rate: $40.00 to $50.00/hr. w2
Responsibilities:
Responsibilities
- Analyze existing Java backend services to understand business logic and data flows.
- Implement APIs using Java 17 and Spring Boot within a shared backend platform.
- Design and build GraphQL APIs aligned with frontend requirements.
- Develop and maintain RESTful APIs.
- Work with PostgreSQL and Apache Cassandra data stores.
- Support data migration and legacy system coexistence strategies.
- Implement event-driven workflows using Kafka.
- Use Redis for caching and performance optimization.
- Write unit and integration tests to ensure production-ready code.
- Follow architectural patterns, coding standards, and review processes.
- Collaborate with the Backend Architect, frontend, QA, and DevOps teams.
Experience Requirements:
Experience Requirements
- 5+ years of backend development experience.
- Strong understanding of microservices or modular backend architecture.
- Expertise in Java 17, Spring Boot, and Spring Framework.
- Hands-on experience designing GraphQL APIs.
- Experience developing RESTful APIs.
- Strong experience with PostgreSQL.
- Working knowledge of Apache Cassandra.
- Experience with Kafka-based event-driven systems.
- Experience using Redis.
- Strong communication and collaboration skills.
- Docker-based application development (preferred).
- Maven builds and dependency management (preferred).
- AWS experience, especially S3 (preferred).
- Strong unit and integration testing experience (preferred).
- Kubernetes fundamentals (preferred).
- Splunk or similar logging and monitoring tools (preferred).
- Experience with legacy system migration or modernization (preferred).
W2 employees of Eliassen Group who are regularly scheduled to work 30 or more hours per week are eligible for the following benefits: medical (choice of 3 plans), dental, vision, pre-tax accounts, other voluntary benefits including life and disability insurance, 401(k) with match, and sick time if required by law in the worked-in state/locality.
Please be advised- If anyone reaches out to you about an open position connected with Eliassen Group, please confirm that they have an Eliassen.com email address and never provide personal or financial information to anyone who is not clearly associated with Eliassen Group. If you have any indication of fraudulent activity, please contact InfoSec@eliassen.com.
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Eliassen Group is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status. Eliassen Group’s Affirmative Action Plan (AAP) is available for inspection by any employee or applicant for employment upon request, during normal business hours of Monday through Friday, 8:30am to 5:30pm EST. Interested persons should contact Phaedra Wells at pwells@eliassen.com for assistance. It is unlawful in Massachusetts and Maryland to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Applicants with disabilities that believe they require an accommodation or assistance with a position, please email our HR team at hradmin@eliassen.com. This email inbox is designed exclusively to assist job seekers whose disability prevents them from being able to apply online. Emails sent for other purposes will not receive a response.
Please be advised that a number of fraudulent job postings have been released under the Eliassen Group brand.
Unfortunately, fraudulent job postings can happen. If anyone reaches out to you about an open position connected with Eliassen Group, never provide personal or financial information to anyone who is not clearly associated with Eliassen Group
If anyone seemingly from Eliassen Group has ever requested this personal information in the past or does so in the future, please contactInfoSec@eliassen.com.
Please ensure that you are working directly with us by confirming the following:
- When you work with Eliassen Group, all email communication will come from an Eliassen.com address, never Gmail, Yahoo, etc.
- Eliassen Group will never ask you for personal information (home address, bank account, or check routing number) until you have worked with someone clearly associated with Eliassen Group, as indicated above