**Description** The Digital Modernization Sector has an opening for a Senior Full Stack (React/Node) Developer to work onsite in Woodlawn, MD five days a week Responsibilities: + Architect, design, code, and implement next-generation web application using software engineering best practices in the latest technologies: NodeJS, Single Page Application front-end (ReactJS, ReduxJS, MobxJS), NodeJS API Framework (RESTful APIs, Express, Knex), and DevOps (Jenkins, Red Hat OpenShift, Docker, SonarQube, UrbanCode). + Provide software expertise in one or more of these areas: Rich Single Page Application modular user interfaces, secure RESTful API micro-services, User Experience (UX) and accessibility (Section 508/WCAG/USDS Web Standards). + Investigate and repair application defects regardless of component: front-end, business logic, middleware, or database (PL/SQL and Data Modeling) + Brief management, customer, team, or vendors using written or oral skills at appropriate technical level for audience. + All other duties as assigned or directed. **(** **_Basic Qualifications_** **)** + Bachelor's degree in Computer Science, Mathematics, Engineering, or a related field and 12 years of overall experience. Additional years of experience may be substituted in lieu of degree. + Master’s or Doctorate degree may substitute for required experience + 10+ years of experience in modern software development with a solid understanding of designing, building, deploying, and running applications. + Combined experience building web applications with modern technologies (Node, React, Redux, Mobx, Flux, Typescript, Bootstrap). + Must be able to obtain and maintain a public trust clearance. **(** **_Required Skills_** **)** _These skills will help you succeed in this position:_ + Extensive senior level full-stack software development experience with React.js and Node.js with detailed understanding of user interface frameworks, back-end software architecture interactions and node module capabilities. + Strong experience with JavaScript frameworks/technologies such as React.js, Express.js, MobX, Reduxor Flux.js. + Strong development experience with developing RESTful Web Services using Node.js. + Comprehensive knowledge of Scrum and Kanban Agile development process and TDD, BDD, ceremonies including scrums, planning events, backlog grooming, retrospectives and demos. + Experience with complex programming, program debugging, data analysis, problem analysis and resolution of issues within open-source applications. + Strong communication and collaborative skills in providing technical direction and hands-on software development to include design, development and testing. + Expertise in writing complex SQL queries in PostgreSQL and optimizing queries. + Experience working as part of a large team and managing and resolving merge conflicts and working with upstream and downstream dependencies. + Ability to mentor team members on Node.js and React technologies. **_(Desired Skills)_** _Showcase your knowledge of modern development through the following experience or skills:_ + Experience with HTML/CSS creation and manipulation. + Experience with other JavaScript frameworks such as Express, Restify, Hapi, Sails, JOI, Moment, Axios and Knex. + Experience with Agility (previously VersionOne) application lifecycle management tool + Experience with Jenkins, Continuous Integration, and DevOps processes and implementation. + Experience with databases (e.g., PostgreSQL) and Solr. + Standards and protocols knowledge including XML, XSLT, WSDL, JSON. + Experience with testing tools including Mocha, Chai, Jest, Sinon, Supertest, Enzyme, Instanbul, Selenium, Load Runner, JSLint and Cucumber. + Experience with source code versioning and Pull Requests with Git and Stash. + Experience with IDEs such as VS code. + Knowledge of SonarCube, Phabricator, Gerritt, Karma, Jasmine + Experience with performance tuning and increasing efficiency of a large enterprise system + Knowledge of projects using SAFe methodology. + Experience with environments utilizing Cloud Technologies such as Amazon Web Services. + Experience with NGiNX web server. + Experience with MQLight, Redis In-memory data structure store and message broker. **Original Posting:** April 28, 2025 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. **Pay Range:** Pay Range $126,100.00 - $227,950.00 The Leidos pay range for this job level is a general guideline onlyand not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law. REQNUMBER: R-00158225 All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.