Lead Senior Software Engineer - Full Stack (Library of Congress)

Ad Hoc is a technology company that empowers organizations to deliver scalable, impactful digital services. Using modern, agile methods, our team creates products that meet people’s needs and transform their experience of government.

Our collaborations have shaped some of the defining moments in public-sector service delivery. We’ve helped build products that connect Veterans to tailored services, help millions access affordable health care, and support important programs like Head Start. As we work with agencies to deliver critical services, we’re also changing how the government approaches technology.

Our culture, communications, and tools are built for remote work, enabling us to bring together top talent nationwide. At Ad Hoc, remote life empowers our teams to design work environments that fit their lives and that foster flexibility and collaboration to achieve positive outcomes for our customers.

Ad Hoc values acceptance, accountability, and humility. We aren’t heroes. We learn from our mistakes and improve the process for the next time. We build small, inclusive teams to collaborate closely with our partners to solve the right problems and deliver software that works.

The Federal Civilian business unit supports many customers spanning the federal, commercial, and nonprofit space. Our customers include NASA, the General Services Administration, Office of Personnel Management, the Library of Congress, Health & Human Services, and the FDIC. We partner with these agencies to build new capabilities, deliver products, establish data as a strategic asset for informed decision-making, modernize legacy systems, and build the digital service infrastructure necessary to scale their mission impact.

Ad Hoc is seeking a Lead Senior Software Engineer - Full Stack to serve as Key Personnel and the technical lead on an engineering team. In this role, you will lead the design and development of the first production content-exchange bridge connecting the Library of Congress Enterprise Copyright System (ECS) and Digital Library Services (DLS) applications.

This is a hands-on technical leadership position with an 80/20 split between writing production code and carrying architecture decisions, mentoring engineers, and steering technical strategy. You will solve critical coordination and technical integration challenges across complex, multi-system environments under separate administrative and contract boundaries.

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  Ad Hoc LLC is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, national origin, ancestry, sex, sexual orientation, gender identity or expression, religion, age, pregnancy, disability, work-related injury, covered veteran status, political ideology, marital status, or any other factor that the law protects from employment discrimination. We value the unique skills gained through military service and encourage veterans and transitioning service members to apply.

• Ability to support core business hours: 8:30 AM – 5:30 PM ET, Monday–Friday.

• Ability to complete Library of Congress IT security training and NDA prior to system access.

While not strictly mandatory, candidates possessing the following will be prioritized:

• Prior delivery on Library of Congress contracts under Library SDLC standards.

• Experience with digital preservation concepts and standards (OAIS, PREMIS, METS).

• Experience building or operating pipelines for malware scanning, fixity validation (MD5/SHA-256 checksums), or format characterization (TIKA, JHOVE2, DROID, Siegfried).