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**ManTech** seeks a motivated, career and customer-oriented **Principal Software Engineer** to join our team in the **Reston or Chantilly, VA** location. This is an onsite position.

The successful candidate will be dedicated full-time to development and enhancement support for existing software and systems solutions and the development of new solutions as required.

Responsibilities include but are not limited to:

+ Designing, developing, programming, and modifying software, systems, applications, and tools, both existing and new in the future

+ Analyzing software and integration requirements and working with team members to determine development and implementation plans

+ Correcting errors by making the appropriate changes and then re-checking the program to ensure the desired result was produced

+ Developing solutions and maintaining support for external data sources and users

+ Building web services, APIs, and other solutions to interface with third-party systems to synchronize data

+ Conducting testing of software to be sure it will produce the desired results and that instructions are correct

+ Organizing and maintaining documentation of developed software and subsequent revisions, so others are able to understand the program

+ Ability and willingness to travel overseas if required

Minimum Qualifications:

+ 15+ years of relevant software engineering experience

+ Bachelor’s degree in a relevant area or five (5) additional years of relevant project management experience in lieu of a degree

+ Strong programming/development skills and hands-on engineering experience (Java & JDK 17+ and/or Javascript/Typescript)

+ Strong experience with REST APIs and standard software engineering tools such as Jira, Git, Gradle/Maven and experience developing software in Linux environments

+ Strong experience with the full data lifecycle, from ingest through display

+ Strong experience using SonarQube for code quality testing

Preferred Qualifications:

+ Experience with one or more of the following development technologies: Vue.js, Vite, microservices, Bash, wireframes, UX patterns, Websockets, Groovy/Grails

+ Experience with one or more of the following test technologies: Junit5, AssertJ, Mockito, Postman, Vitest, Eslint

+ Experience with one or more of the following infrastructure/database technologies: MongoDB, Elasticsearch, PostgreSQL, RabbitMQ, Consul, Vault, Nomad, RHEL9

+ Experience with Cloud technologies and developing in Cloud environments

Clearance Requirements:

+ Must possess an active Secret clearance

Physical Requirements:

+ Must be able to be in a stationary position more than 50% of the time

+ Must be able to communicate, converse, and exchange information with peers and senior personnel

+ Constantly operates a computer and other office productivity machinery, such as a computer

+ The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.

If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at [email protected] and provide your name and contact information.