Principal software engineer jobs in Modesto, CA - 204 jobs

About Sandia Sandia National Laboratories is the nation's premier science and engineering lab for national security and technology innovation, with teams of specialists focused on cutting‑edge work in a broad array of areas. Some of the main reasons we love our jobs: Challenging work with amazing impact that contributes to security, peace, and freedom worldwide Extraordinary co‑workers Some of the best tools, equipment, and research facilities in the world Career advancement and enrichment opportunities Flexible work arrangements for many positions include 9/80 (work 80 hours every two weeks, with every other Friday off) and 4/10 (work 4 ten‑hour days each week) compressed workweeks, part‑time work, and telecommuting (a mix of onsite work and working from home) Generous vacation, strong medical and other benefits, competitive 401k, learning opportunities, relocation assistance and amenities aimed at creating a solid work/life balance* World‑changing technologies. Life‑changing careers. Learn more about Sandia at: ********************* *These benefits vary by job classification. What Your Job Will Be Like Are you passionate about solving complex problems and applying your expertise to develop innovative solutions? Join our dynamic team and help solve critical challenges to enhance our nation's security! We are seeking an experienced Software Engineer (job title: R&D S&E Computer Science) to design and implement cutting‑edge solutions for high‑consequence national security challenges. In this role, you will collaborate with U.S. government customers to develop impactful capabilities that directly support warfighters, strengthen national security, and deliver measurable results for critical missions. Your contributions will foster innovation, leverage teamwork, and cultivate creativity while addressing key mission needs. On any given day, you may be called on to: Lead and collaborate with technical design teams and subject matter experts to create innovative solutions that meet mission requirements and address end‑user needs. Utilize your skillset in software system architecture, software system implementation, technical documentation, reliability and performance assessment, and/or systematic technology insertion to enhance mission capabilities utilizing code bases ranging from 0.5 to 1.0+ million lines of code. Collaborate with Software Engineers, System Engineers, Information Technology staff, management, and customers to implement solutions that address requirements. Architect software systems, develop code, write unit tests, and create software tools to support the mission. Develop and execute test plans/procedures, create reports, and write software documentation. Perform system integration and unit testing. Apply system design principles to architect scalable, reliable, and secure solutions for critical missions. Incorporate software design methodologies to proactively address computer security considerations throughout the software development lifecycle. Develop and refine system CONOPS (Concept of Operations) to ensure technical solutions address operational needs. This position requires willingness and ability to work in a 24/7/365 on‑call support role to provide software discrepancy resolution. Due to the nature of the work, the selected applicant must be able to work onsite 100% of the time at the Livermore, CA site. Applicants on this requisition may be interviewed by multiple organizations at Sandia National Laboratories. Ability and willingness to travel, up to 25%, required. Salary Range $135,700 - $270,900 *Salary range is estimated, and actual salary will be determined after consideration of the selected candidate's experience and qualifications, and application of any approved geographic salary differential. Qualifications We Require A Bachelor's degree in a relevant discipline and five (5) years of directly relevant experience, or an equivalent combination of directly relevant education and engineering or scientific experience that demonstrates the knowledge, skills, and ability to perform independent research and development. Ability to obtain and maintain a DOE Q‑level and SCI‑level security clearance, which may require a polygraph test. Qualifications We Desire The ideal R&D S&E Computer Science candidate for Sandia National Laboratories will in addition possess the following: Graduate degree in Computer Science or a highly related field where an independent research project was a graduation requirement (e.g., independent project, thesis, or dissertation). Demonstrated software development skills and familiarity with modern software development practices and tools (e.g., Agile). Strong verbal and written communication skills, ability to work effectively in multidisciplinary teams, and a passion to improve and expand technical skills. Experience Requirements Also, for this posting we are seeking individuals with the following experience: An ideal candidate will have 10+ years experience in front‑end, back‑end, or full stack development in software engineering for code bases with 0.5 to 1.0+ million lines of code and the ability to quickly understand and contribute to complex software systems. Expertise in front‑end or full‑stack development, with proficiency in JavaScript, TypeScript, Angular, jQuery, and HTML5/CSS. Expertise in back‑end web application development using frameworks and tools such as Spring MVC, Tomcat, Jetty and coding with languages such as Java, Python, C++, JavaScript. Experience with mapping libraries such as Leaflet, Google Maps, Esri ArcGIS. Hands‑on experience with Relational Databases (e.g., Oracle PL/SQL, SQLite) and Non‑Relational Databases (e.g. NoSQL, Cassandra). Experience with Web Services, including WSDL, SOAP, and REST. Experience with any of the following: Apache Karaf, Apache Camel, Mina/Netty, OSGI, JMX, JDBC, Apache Aries, Log4J2, Apache CXF, Docker, Hazelcast, or Apache Ignite. Proven experience with Test‑driven development and testing methodologies. Knowledge of secure software engineering practices, including vulnerability assessment and software supply chain management methodologies such as Nexus scanning. Ability to analyze technology stacks to identify opportunities for optimization, security enhancements, and risk reduction. Ability to navigate ambiguous situations, and collaborate effectively with stakeholders and internal/external mission partners. Active DOE Q/SCI security clearance or equivalent DOD Top Secret/SCI security clearance. About Our Team The Special Programs Department (SPD) is responsible for managing and executing a variety of classified efforts at SNL's California site, including both Sensitive Compartmented Information (SCI) and Special Access Programs. These efforts entail providing communications services to a variety of customers. The SPD works closely with the National Nuclear Security Administration (NNSA), Department of Defense (DoD), and Intelligence Community (IC) to accomplish these efforts. The Special Programs Departments (8481, 8482, 8483, 8489) are responsible for developing high‑impact and high‑consequence national security projects that support a broad range of U.S. government sponsors. Our projects span numerous technical disciplines, including software engineering, systems engineering, network and infrastructure design, and information assurance. These projects encompass all phases of the system development lifecycle from inception to operations, and range in duration from days to years. Special Programs success stem from the teams ability to create innovative, end‑to‑end capabilities that support the most demanding missions. We partner closely with our customers to understand their mission needs and quickly develop robust meaningful solutions. Special Programs unique infrastructure, domain expertise, and innovative approaches deliver exceptional capabilities to our sponsors, while fostering a dynamic and engaging work environment for our team. Posting Duration This posting will be open for application submissions for a minimum of seven (7) calendar days, including the posting date. Sandia reserves the right to extend the posting date at any time. Security Clearance Sandia is required by DOE to conduct a pre‑employment drug test and background review that includes checks of personal references, credit, law enforcement records, and employment/education verifications. Applicants for employment need to be able to obtain and maintain a DOE Q‑level security clearance and SCI access, both of which require U.S. citizenship. SCI access may also require a polygraph examination. If you hold more than one citizenship (i.e., of the U.S. and another country), your ability to obtain these levels of access may be impacted. Applicants offered employment with Sandia are subject to a federal background investigation to meet the requirements for access to classified information or matter if the duties of the position require a DOE security clearance. Substance abuse or illegal drug use, falsification of information, criminal activity, serious misconduct or other indicators of untrustworthiness can cause a clearance to be denied or terminated by the DOE, resulting in the inability to perform the duties assigned and subsequent termination of employment. EEO All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, or veteran status and any other protected class under state or federal law. NNSA Requirements for MedPEDs If you have a Medical Portable Electronic Device (MedPED), such as a pacemaker, defibrillator, drug‑releasing pump, hearing aids, or diagnostic equipment and other equipment for measuring, monitoring, and recording body functions such as heartbeat and brain waves, if employed by Sandia National Laboratories you may be required to comply with NNSA security requirements for MedPEDs. If you have a MedPED and you are selected for an on‑site interview at Sandia National Laboratories, there may be additional steps necessary to ensure compliance with NNSA security requirements prior to the interview date. #J-18808-Ljbffr