Full Stack Software Developer

LLNL•Livermore, CA

7h•Hybrid

About The Position

Are you looking for ways to spend less time on repetitive tasks? Help us explore how GenAI can enhance and streamline nuclear facility operations. We are seeking for a Full Stack Software Developer to design, develop, and maintain complex software systems supporting mission-critical analytical and operational workflows. You will contribute across the full technology stack, from modern web-based user interfaces to back-end services, data pipelines, and software quality assurance processes. This role requires close collaboration with scientists, engineers, and domain experts to translate complex requirements into robust, maintainable, and scalable software solutions. The work involves graph-based data models, document processing pipelines, version control and change management, and integration of advanced AI-enabled tooling. This position is within the Global Security Computing Applications Division (GS-CAD) of the Computing Directorate, matrixed to the Global Security Directorate. This position will be filled at either level based on knowledge and related experience as assessed by the hiring team. Additional job responsibilities (outlined below) will be assigned if hired at the higher level.

Requirements

Ability to secure and maintain a U.S. DOE Q-level security clearance, which requires U.S. citizenship.
Bachelor’s degree in computer science, software engineering, or a related technical discipline, or an equivalent combination of education and relevant experience.
Broad experience as a full stack software developer, with contributions to both front-end development (React or Angular frameworks, HTML, CSS, and/or JavaScript) and back-end systems including experience with back-end services using Flask (e.g., API design and integration with databases and external services.)
Comprehensive knowledge and broad experience with Neo4J or other graph databases, including querying, data modeling, and transformation of graph-based data.
Proficiency with version control systems (e.g., Git), including branching strategies, change tracking, and collaborative development workflows.
Broad experience developing unit tests and supporting software quality assurance activities.
Proficient analytical and problem-solving skills, with the ability to understand moderately complex to complex requirements and translate into effective software solutions.
Proficient written and verbal communication skills, necessary to effectively collaborate in a team environment and present and explain technical information, with the ability to document designs and communicate technical concepts.
Advanced experience as a full stack software developer, including contributing to the design and implementation of complex, multi-component software systems.
Demonstrated ability to define and implement testing strategies and to lead software quality assurance (SQA) efforts, including unit testing, integration testing, and documentation.
Experience providing technical leadership and mentorship, including guiding other developers, reviewing designs and code, and promoting software engineering best practices.
Ability to work independently on ambiguous or complex problems, exercising sound technical judgment and initiative to develop effective solutions.

Nice To Haves

Master’s degree or PhD in applied data science, computer science, computer engineering, or a related technical field.
Experience refactoring legacy or prototype code into production-quality, reusable software components.
Experience developing or maintaining software in regulated or safety-related environments, including experience with DOE 10 C.F.R. Part 830–related software or “830 software”.

Responsibilities

Contribute to the design, development, test, and maintenance of full stack software applications to both front-end user interfaces and back-end services. This includes contributing to the development of front-end applications using modern JavaScript frameworks such as React or Angular, and implementing and maintaining back-end services using Flask.
Utilize Neo4J graph databases extensively, including: Querying, extracting, and transforming graph nodes and relationships Aggregating nodes and calculating derived values from graph-based data Rendering graph-based data in alternative visual or structured representations to support analytical workflows
Support and enhance version control and change management workflows, including: Tracking changes across evolving data and document versions Participate in the implementation of mechanisms for diffing and comparing new document versions based on encoded graph structures
Refactor existing scripts and prototype code into modular, reusable, and maintainable software components, consolidating functionality where appropriate to improve reliability and extensibility.
Contribute to the development of unit tests and supporting artifacts to ensure software quality, reliability, and maintainability to software quality assurance (SQA) documentation in accordance with project and organizational standards.
Collaborate with multidisciplinary teams, including software developers, domain experts, and stakeholders, to gather requirements, participate in review designs, and provide high-quality software solutions to problems of moderate complexity.
Apply best practices in software engineering, including code reviews, documentation, configuration management, and secure development practices.
Perform other duties as assigned.
Serve as a technical contact for complex software development efforts, providing technical direction and mentoring to junior and mid-level developers.
Contribute to software quality assurance (SQA) activities, including defining testing approaches, reviewing test coverage, and ensuring compliance with project and organizational requirements.
Perform technical risk assessment and mitigation, identifying potential issues related to architecture, performance, maintainability, or data integrity and proposing effective solutions.