Senior Back End Developer Jobs in Reston, VA (NOW HIRING)

Public Trust Eligibility Required

This is a contingent position, meaning employment is dependent upon the successful award of the associated contract to Aretum and completion of any required background investigation or security clearance verification.

About Aretum

Aretum is a mission-driven organization committed to delivering innovative, technology-enabled solutions to our customers across defense, civilian, and homeland security sectors. Our teams work at the intersection of strategy, technology, and transformation, helping agencies solve their most critical challenges. We believe in investing in our people and creating a culture where collaboration, inclusion, and professional growth are at the forefront.

Job Summary

Aretum is seeking a Java Backend Developer to join our team supporting a large-scale federal technology modernization program. As a Java Backend Developer, you will be embedded within a cross-functional Agile scrum team, participating in the design of software tools and subsystems that support reuse and domain analysis, and assisting senior Applications Engineers and Application Programmers in interpreting software requirements and design specifications to code, integrate, and test software components. Your primary focus will be Java backend services running as containerized microservices in an AWS cloud-native environment, with additional work in Python where required. You will write production code, author and maintain unit and integration tests, participate in peer code review, support release engineering through GitLab CI/CD pipelines, and participate in all sprint ceremonies within a SAFe Agile framework. This role is a hands-on development position intended for a developer who is productive independently on well-scoped tasks while continuing to grow under the guidance of senior engineers.

Due to the nature of our work as a federal consulting organization, employees may be expected to handle Controlled Unclassified Information (CUI) and must adhere to applicable safeguarding and compliance requirements.

Responsibilities

• Participate in the design of software tools, subsystems, and reusable components, contributing to domain analysis and design discussions led by senior engineers

• Assist Applications Engineers and senior Application Programmers in interpreting software requirements and design specifications into working, tested code

• Integrate and test software components, ensuring that units, modules, and services work together correctly across the microservices architecture

• Design, develop, test, and maintain Java backend microservices and REST APIs, following established coding standards, architectural patterns, and the program's Definition of Done

• Work with PostgreSQL databases, including schema design, writing and optimizing SQL queries, and implementing data access layers

• Integrate backend services with Elasticsearch / OpenSearch for search indexing and with AWS S3 for file storage, AWS SNS and SQS for event-based messaging, and AWS RDS for relational persistence

• Build and maintain containerized Java services that run on AWS Elastic Container Service, ensuring services are observable, resilient, and ready for deployment to isolated VPC networking environments

• Contribute to Python backend services where the team's work requires it, applying the same standards of testability, readability, and maintainability

• Author and maintain unit tests and integration tests for backend code, supporting the program's test automation strategy and code coverage expectations

• Support and maintain GitLab CI/CD pipelines for backend services, including build, test, scan, and deployment stages

• Contribute to infrastructure-as-code in Terraform under the guidance of senior engineers, and support peer review of infrastructure changes

• Participate actively in peer code review, both submitting code for review and reviewing teammates' code against agreed standards

• Participate fully in SAFe Agile ceremonies (Sprint Planning, Daily Standup, Sprint Review, Retrospective, and Backlog Refinement) providing accurate estimates and status updates on assigned work

• Break down assigned user stories into appropriately sized technical tasks and track work transparently in the program's Agile tooling

• Support Tier-2 and Tier-3 production issue resolution for backend components developed by the team, participating in troubleshooting activities and implementing prioritized fixes

• Remediate backend code and dependency security vulnerabilities identified through routine security scanning within required timeframes: 30 calendar days for High-Priority vulnerabilities and 180 calendar days for Medium-Priority vulnerabilities

• Document code, APIs, and data models clearly, and maintain technical documentation in the program's collaboration tools

Requirements

• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or a related field (or 3 years of additional experience)
• Minimum 3 years of professional backend web development experience
• Demonstrated, hands-on experience developing production backend services in Java
• Working experience with Python for backend development or scripting, sufficient to contribute to Python services when team priorities require it
• Hands-on experience designing, querying, and optimizing PostgreSQL (or similar) databases, including schema design and SQL tuning
• Working experience with Elasticsearch or OpenSearch for search indexing
• Hands-on experience building and running containerized microservices, including writing/maintaining Dockerfiles
• Working experience with AWS services relevant to cloud-native microservices (e.g., Elastic Container Service, RDS, S3, SNS, SQS)
• Working experience with GitLab (or equivalent) source control and CI/CD pipelines
• Exposure to Terraform or equivalent infrastructure-as-code tooling
• Proficiency writing unit and integration tests for backend code
• Experience participating in peer code review, both as author and reviewer
• Experience working in Agile/Scrum environments, including active participation in sprint ceremonies and backlog refinement
• Strong written and verbal communication skills, with the ability to collaborate across a scrum team, ask clarifying questions of senior engineers, and provide clear status on assigned work

Preferred Qualifications

• Experience supporting federal government clients

• Experience working in a SAFe environment with multiple synchronized Scrum teams and Program Increment (PI) planning

• Experience with Spring Boot or comparable Java application frameworks for building REST APIs

• Experience with event-driven or messaging-based architectures (e.g., SNS, SQS, Kafka, or similar)

• Experience with AWS VPC networking patterns, application load balancers, and private-subnet container hosting

• AWS certification (e.g., AWS Certified Developer – Associate, AWS Certified Solutions Architect – Associate)

• Experience contributing to Tier-2 production support rotations, including troubleshooting and hotfix deployment

Travel Requirements

This is a remote position; however, occasional travel may be required based on project needs, client meetings, team collaboration events, or training sessions. Travel is expected to be less than 10% and will be communicated in advance whenever possible.

EEO Statement

Aretum is committed to fostering a workplace rooted in excellence, integrity, and equal opportunity for all. We adhere to merit-based hiring practices, ensuring that all employment decisions are made based on qualifications, skills, and ability to perform the job, without preference or consideration of factors unrelated to job performance.

As an Equal Opportunity Employer, Aretum complies with all applicable federal, state, and local employment laws.

We are proud to support our nation’s veterans and military families, providing career opportunities that honor their service and experience.

If you require reasonable accommodation during the hiring process due to a disability, please contact hr@aretum.com for assistance.

Equal Opportunity Employer/Veterans/Disabled

U.S. Work Authorization
Applicants must be U.S. citizens or currently authorized to work in the United States on a full-time basis. This position supports a federal government contract and requires the ability to obtain and maintain a Public Trust or Suitability Determination, depending on the agency’s background investigation requirements. Sponsorship is not available.

Benefits

• Health Care Plan (Medical, Dental & Vision)

• Retirement Plan (401k)

• Life Insurance (Basic, Voluntary & AD&D)

• Paid Time Off

• Family Leave (Maternity, Paternity)

• Short Term & Long-Term Disability

• Training & Development