Java​/.net Modernization Engineer

Tuknik Government Services, LLC, a Koniag Government Services company, is seeking a Java/.net Modernization Engineer with a Secret security clearance to support TGS in supporting our government customer in the DC Metro area.

This position is for a Future New Business Opportunity.

Benefits include medical, dental, and vision insurance, 401(k) retirement plan, paid time off, paid parental leave, life and disability insurance, flexible spending accounts, commuter benefits and tuition reimbursement.

Tuknik Government Services, LLC, Koniag Government Services (KGS) is seeking qualified candidates for this role supporting our U.S. Army customer on a large-scale Army contracting systems modernization and automation program. Analyzes and decouples legacy Java and .NET components supporting solution integrations. The engineer preserves required behavior and interfaces while helping the team retain, wrap, refactor, replace, or retire each component through controlled migration waves.

This is a contingent recruiting profile; the opening, employing subsidiary, compensation, work location, and staffing remain subject to final contract authorization.

• Inventory legacy Java and .NET applications, services, libraries, jobs, interfaces, dependencies, configurations, and operational procedures.
• Trace business rules, calculations, transformations, data access, authentication, error handling, and external dependencies in legacy code.
• Recommend retain, wrap, refactor, replace, or retire dispositions based on mission need, security, supportability, performance, and lifecycle cost.
• Develop API facades and compatibility adapters that preserve external contracts while target Appian capabilities transition.
• Refactor approved services into modular, testable components or bounded external services where Appian-native implementation is not appropriate.
• Eliminate unsupported libraries, embedded credentials, obsolete protocols, and high-risk custom code through approved designs.
• Create unit, integration, contract, regression, and security tests that compare modernized behavior with the legacy baseline.
• Support data migration, parallel operation, deployment, cutover, rollback, stabilization, and legacy retirement.
• Package code through the approved Dev Sec Ops  pipeline and resolve code-quality, dependency, vulnerability, and licensing findings.
• Maintain technical designs, interface specifications, dependency maps, release notes, and operational documentation.

• Bachelor's degree in computer science, engineering, information systems, or a related field; additional relevant experience may substitute for education.
• Five or more years of enterprise software engineering experience using Java, .NET/C#, or both.
• Experience modernizing legacy applications, decomposing tightly coupled services, and preserving APIs, business rules, and data behavior.
• Experience with relational databases, REST/SOAP services, secure coding, automated testing, CI/CD, and production troubleshooting.
• U.S. citizenship and the active security clearance or eligibility required for the assigned work by the start of performance, with ongoing eligibility thereafter.
• Ability to communicate clearly with Government, technical, and business stakeholders and to maintain accurate work records in approved systems.
• Ability to protect Controlled Unclassified Information and classified information, when assigned, and comply with required access, training, and handling procedures.

• Experience integrating conventional code with Appian or another low-code platform.
• Experience with Spring, ASP.NET, containers, AWS, Oracle, S3, or enterprise document and reporting systems.
• Experience modernizing Federal acquisition, financial, or other regulated applications.

• Java and .NET enterprise development
• Legacy analysis and incremental refactoring
• API facades and compatibility engineering
• Automated testing and secure Dev Sec Ops
• Migration, cutover, and production support

Work may occur remotely when authorized, at Government facilities, or in controlled office and data-center environments. Work involving classified information or SIPRNet will be performed at a Government-approved secure location using authorized systems. The role generally supports Government business hours, with occasional release, incident-response,…