Senior Java Backend Engineer - Remote Gov Tech

Ad Hoc LLC; Washington (District of Columbia); Hybrid; USD 115,000 - 135,000; Full time

Benefits offered by this job

Company-subsidized health, dental, and

Flexible PTO

401K with employer match

Paid parental leave

Employee Assistance Program

Job summary

Ad Hoc LLC is seeking a Senior Java Software Engineer (Library of Congress) to contribute as an experienced individual contributor and mentor. You will support backend systems, design scalable solutions, and collaborate with stakeholders across federal civilian clients.

This role emphasizes leadership, architectural guidance, and strong Java expertise in a remote-friendly environment. The position requires a bachelor's degree and 7+ years of engineering experience, with a focus on RESTful APIs,

Qualifications

• Bachelor's degree and 7+ years of engineering experience; relevant experience may substitute for education
• Proficiency in Java for server-side development
• Experience building and consuming RESTful APIs, including versioned OpenAPI specifications
• Hands-on experience with relational databases (PostgreSQL preferred) and non-relational/search platforms (Elasticsearch)
• Familiarity with containerized deployments using Docker and AWS services (ECS, RDS, S3, Lambda, CloudWatch)
• Experience working in agile environments with CI/CD pipelines and version control via Git/GitLab
• Practice writing automated tests (JUnit, Pytest, or equivalent) and working within quality gate frameworks like SonarQube

Responsibilities

• Demonstrate technical expertise, accountability, and ownership of contributions to the application codebase.
• Maintain a strong understanding of adjacent technical areas, systems, and ecosystems to effectively coordinate integrations and dependencies.
• Design, develop, test, maintain, and improve high-quality software solutions across front-end and/or back-end systems.
• Diagnose and resolve complex technical issues within owned systems, using incidents and lessons learned to identify opportunities for system and process improvements.
• Mentor and support junior and mid-level engineers in developing their technical and problem-solving skills.
• Clearly communicate technical concepts, issues, risks, and developments to team members, clients, and stakeholders.
• Participate in technical interviews and help evaluate engineering candidates.
• Use strong technical judgment and influencing skills to propose, evaluate, and recommend approaches to technical and process challenges.
• Provide technical guidance and mentorship to engineers within the team.
• Lead small projects, technical initiatives, or temporary team structures as needed.
• Develop and present design documents, system diagrams, technical recommendations, and other engineering artifacts to clients, stakeholders, partners, and fellow engineers.

Skills

Java backend

REST APIs

PostgreSQL

Elasticsearch

Docker

AWS

CI/CD

Testing (JUnit/Pytest)

Education

Bachelor's degree

Tools

Git/GitLab

OpenAPI specs

Job description

Ad Hoc LLC is seeking a Senior Java Software Engineer (Library of Congress) to contribute as an experienced individual contributor and mentor. You will support backend systems, design scalable solutions, and collaborate with stakeholders across federal civilian clients.

This role emphasizes leadership, architectural guidance, and strong Java expertise in a remote-friendly environment. The position requires a bachelor's degree and 7+ years of engineering experience, with a focus on RESTful APIs,