Jobs in the United States

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Added 12 hours ago
Senior Software Engineer (Institutional, Financing)
Coinbase
Trenton, NJ
Drive engineering excellence by improving developer tooling, testing infrastructure, monitoring, and operational reliability across financing systems.
Added 12 hours ago
WI
(USA) Principal, Software Engineer
Walmart Inc.
United States
- $143,000 to $286,000 USD / year
Strong proficiency in software development lifecycle management, including CI/CD, testing, monitoring, and incident response.
Added 13 hours ago
Senior/Principal Cybersecurity - Software and AI Security, Onsite
Sandia National Laboratories
Albuquerque, NM
Evaluate, test, and integrate modern security tooling, including static and dynamic application security testing (SAST/DAST) and automated vulnerability detection systems.
Added 13 hours ago
EG
Senior Java Full-Stack Developer
Eliassen Group
Santa Fe, NM
- $70 to $80 USD / hour
Our client is seeking a Senior Java Full-Stack Developer to design, build, and support scalable software solutions across the full application stack. This individual will work as part of a…
Added 13 hours ago
Senior Software Engineer
Northrop Grumman
Newport News
Strong experience with Java, JavaScript, TypeScript, and object-oriented design.
Added 13 hours ago
Resource Control Team Software Engineer (Level 1 or 2) - AHT
Northrop Grumman
Manhattan Beach
Background in software integration, system level testing, and regression testing for medium to large code bases.
Added 13 hours ago
EG
Senior Java Full-Stack Developer
Eliassen Group
Des Moines, IA
- $70 to $80 USD / hour
Our client is seeking a Senior Java Full-Stack Developer to design, build, and support scalable software solutions across the full application stack. This individual will work as part of a…
Added 13 hours ago
Manufacturing Execution System Intern
BorgWarner Inc.
Hendersonville, NC
· Drive the implementation, configuration, testing, and deployment of manufacturing software applications and MES visualizations.
Added 13 hours ago
Software Engineer Principal
Syms Strategic Group, LLC (SSG)
Raleigh, NC
Manage system logging, Java Virtual Machine (JVM) tuning, and certificate/keystore configurations
Added 13 hours ago
Software Systems Engineer Principal
Syms Strategic Group, LLC (SSG)
Raleigh, NC
Manage system logging, Java Virtual Machine (JVM) tuning, and certificate/keystore configurations
Added 13 hours ago
C
Sr. AWS Data Engineer (Java, Python & Generative AI)
Cognizant
Charlotte, NC
- $90,000 to $105,000 USD / year
Develop and support Java-based REST APIs, preferably using Spring Boot, to enable secure and reliable data access.
Added 13 hours ago
EG
Senior Java Full-Stack Developer
Eliassen Group
Raleigh, NC
- $70 to $80 USD / hour
Our client is seeking a Senior Java Full-Stack Developer to design, build, and support scalable software solutions across the full application stack. This individual will work as part of a…
Added 13 hours ago
Web Developer Lead
B&H Photo
New York, NY
The Web Developer Team Lead creates advanced to highly complex code structures using Java technologies and SQL Query languages. Possessing an expert knowledge of multiple web programming…
Added 13 hours ago
Software Engineer, Lead
The MITRE Corporation
Aberdeen, MD
Collaborate with government and industry stakeholders to ensure successful development, testing, and fielding of innovative Command and Control (C2) solutions including software, data…
Added 13 hours ago
UO
Advanced Lab Manager (4758C) - Physics #89878
University of California, Berkeley
CA
- $93,354.48 to $172,092.96 USD / year
…activities including conception, design, construction, and testing of experiments, as well as documentation and editing of instructional materials. The two courses managed by this position…
Added 13 hours ago
UG
Senior Software Engineer
UnitedHealth Group
Eden Prairie, MN
- $91,700 to $163,700 USD / year
Build enterprise-grade backend microservices and automation tools using Java, Go, or Python
Added 13 hours ago
Spring Migration Engineer
NTT DATA Americas, Inc.
Austin
Lead the end-to-end migration of legacy Java applications to Spring and Spring Boot with minimal disruption to business operations.
Added 13 hours ago
SO
IT Application Development (Senior Specialist)
State of Washington
Olympia, WA
- $99,300 to $133,608 USD / year
Eleven (11) years of progressively more complex problem solving as a developer designing, developing or maintaining large-scale applications with mission critical business functions using…
Added 13 hours ago
SO
IT System Administration - Senior/Specialist
State of Washington
Olympia, WA
- $8,522 to $11,460 USD / month
Seven years of progressively complex problem-solving experience developing, maintaining, and/or deploying .NET and Java-based applications and SQL databases.
Added 13 hours ago
Software Engineer II - Argo Applications
Frost Bank
San Antonio, TX
…this role, you will be responsible for designing, configuring, testing, implementing, supporting, and documenting solutions for assigned applications across the organization. You welcome a…
Added 13 hours ago
IT Solutions Designer (US)
TD Bank, N.A.
Mount Laurel, NJ · Fort Lauderdale, FL
…software support, development of technical solutions and/or…
Added 13 hours ago
Senior Application Developer (Candidates must have experience with Informatica)
Highmark Health
Jefferson City, MO
+ Certification such as JAVA Developer, DB2 Certification, Cognos Certification
Added 14 hours ago
Java/.net Modernization Engineer
Koniag Government Services
Washington, DC
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…
Added 14 hours ago
Software Developer
Koniag Government Services
Huntsville, AL
Operating under the technical direction of the Software Development Lead and Solutions Architect, the Senior Software Developer will play an integral role throughout the full software…
Added 14 hours ago
UI Developer
Koniag Government Services
Vienna, VA
This developer would be responsible for development and maintenance of web applications and services. Responsibilities could include all aspects of the software development life cycle…

Koniag Government Services

Java/.net Modernization Engineer

Washington, DC, United States

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Job details

Posting language: English
Posted: Oct 29, 2026

Original job description

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.

Essential Functions, Responsibilities & Duties may include, but are not limited to:

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 DevSecOps pipeline and resolve code-quality, dependency, vulnerability, and licensing findings.
Maintain technical designs, interface specifications, dependency maps, release notes, and operational documentation.

Education and Experience Required:

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.

Education and Experience Desired:

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.

Required Skills and Competencies:

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

Work Environment and Travel:

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, maintenance-window, or approved travel requirements. Reasonable accommodations may be made to enable qualified individuals with disabilities to perform the essential functions.

Our Equal Employment Opportunity Policy

The company is an equal opportunity employer. The company shall not discriminate against any employee or applicant because of race, color, religion, creed, ethnicity, sex, sexual orientation, gender or gender identity (except where gender is a bona fide occupational qualification), national origin or ancestry, age, disability, citizenship, military/veteran status, marital status, genetic information or any other characteristic protected by applicable federal, state, or local law. We are committed to equal employment opportunity in all decisions related to employment, promotion, wages, benefits, and all other privileges, terms, and conditions of employment.

The company is dedicated to seeking all qualified applicants. If you require an accommodation to navigate or apply for a position on our website, please get in touch with Heaven Wood via e-mail at accommodations@koniag-gs.com or by calling 703-488-9377 to request accommodations.

Koniag Government Services (KGS) is an Alaska Native Owned corporation supporting the values and traditions of our native communities through an agile employee and corporate culture that delivers Enterprise Solutions, Professional Services and Operational Management to Federal Government Agencies. As a wholly owned subsidiary of Koniag, we apply our proven commercial solutions to a deep knowledge of Defense and Civilian missions to provide forward leaning technical, professional, and operational solutions. KGS enables successful mission outcomes for our customers through solution-oriented business partnerships and a commitment to exceptional service delivery. We ensure long-term success with a continuous improvement approach while balancing the collective interests of our customers, employees, and native communities. For more information, please visit www.koniag-gs.com.

Equal Opportunity Employer/Veterans/Disabled. Shareholder Preference in accordance with Public Law 88-352

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