Senior Parallel File System Software Developer

Company Description Join us and make YOUR mark on the World! Lawrence Livermore National Laboratory (LLNL) has turned bold ideas into world-changing impact advancing science and technology to strengthen U.S. security and promote global stability. Company Description Join us and make YOUR mark on the World! Lawrence Livermore National Laboratory (LLNL) has turned bold ideas into world-changing impact advancing science and technology to strengthen U.S. security and promote global stability. Our mission spans four critical national security areas nuclear deterrence, threat preparedness, energy security, and multi-domain defense empowering teams to take on the toughest challenges of today and tomorrow. With a culture built on innovation and operational excellence, LLNL is a place where your expertise can make a real impact. Job Description We have an opening for a Senior Parallel File System Software Developer to provide technical leadership in researching, architecting, developing, maintaining, and integrating software and hardware solutions that underpin scalable storage services within the Livermore Computing high‑performance computing center. In this role, you will apply subject‑matter expertise and independent technical judgment to advance and sustain production parallel file systems: including resolution of highly complex, system‑wide software defects and architectural issues in partnership with system administration staff and external collaborators. You’ll independently develop and lead the technical evaluation, design, integration, and sustainment of software fixes, upstream patches, and locally developed enhancements to address challenging issues on large‑scale Linux systems. Additionally, this position will establish technical direction for innovative software capabilities in Lustre and ZFS file systems. This position is in the Livermore Computing Division within the Computing Principal Associate Directorate. This position offers hybrid option. You will have the flexibility to remotely work from home with regular visits to LLNL. You will Provide software engineering technical leadership for the evolution, reliability, and performance of production Lustre file systems running at petabyte and billion‑object scale. Serve as a technical subject matter expert and provide technical leadership for highly complex storage‑system software development initiatives for new features, performance improvements, and maintenance of Lustre codebases along with related projects (ZFS, Lustre monitoring tools, storage quota systems, etc.). Review both upstream and local code changes, set technical criteria for adoption, and lead integration of upstream and locally developed changes into production Lustre deployments. Lead cross‑functional efforts to identify, integrate, and implement innovative storage system solutions, including evaluating technical tradeoffs, risks, lifecycle impacts, and alternative architectures. Lead diagnosis and resolution of critical system‑wide performance, scalability, and reliability issues in production storage systems, where decisions may affect availability of major Laboratory computing resources and mission workloads. Establish and influence technical roadmaps, architecture, and engineering priorities for parallel file‑system software in alignment with long‑range Livermore Computing and Laboratory mission needs. Provide strategic technical guidance to project stakeholders, management, and partner organizations, including recommendations that influence operational, technology‑investment, and service‑delivery decisions. Mentor and develop technical staff across the organization and share expertise broadly with the next generation of storage professionals. Perform other duties as assigned. Qualifications Ability to maintain a U.S. DOE Q‑level security clearance which requires U.S. citizenship. Bachelor’s degree in computer science or related field or the equivalent combination of education and related experience. Significant and demonstrated subject‑matter expertise in parallel file‑system internals, including substantial experience with the Lustre codebase. Significant experience in a production high‑performance computing environment where unplanned downtime has significant operational consequences and end‑user impact. Advanced proficiency developing systems software in C in a team environment with additional proficiency in C++, Rust, or Python. Highly advanced knowledge and technical experience with Linux operating systems and Linux kernel interfaces, including configuration, networking, and system security. Advanced problem‑solving and debugging skills to diagnose multi‑component problems in highly parallel, multi‑threaded systems and identify the root cause of complex storage system issues — includes advanced proficiency with Linux debugging and inspection tools (examples: strace, perf, gdb, the /proc file system, and/or eBPF). Expert verbal, written, interpersonal, and technical‑influence skills necessary to advise management, collaborate across organizations, communicate with external technical communities, and present and explain complex technical information under limited direction. Ability to set priorities, independently resolve complex problems, and apply new technologies to broadly defined tasks and projects in a fast‑paced environment. Demonstrated ability to lead technical projects or major workstreams, establish technical direction, and influence decisions across multidisciplinary teams. Availability to work off‑hours to resolve production problems, on an as‑needed basis. Qualifications We Desire Master’s degree in computer science or related field or the equivalent combination of education and related experience. Familiarity with open‑source storage community contributions — cherry‑picking patches, umbrella organizations (such as OpenZFS or OpenSFS), upstreaming contributions (such as to the Lustre mainline), etc. Demonstrated record of technical contributions to open‑source storage projects, technical publications, conference presentations, or leadership in relevant technical communities. Experience with integration of traditional storage systems and cloud‑first technologies such as S3 data transfer protocol, object storage, OIDC/OAuth, and/or metadata extraction and cataloging systems. Experience defining storage architecture or technical roadmaps for large‑scale HPC, scientific computing, or similarly mission‑critical environments. Pay Range $210,630 - $267,060 Annually This is the lowest to highest salary we in good faith believe we would pay for this role at the time of this posting; pay will not be below any applicable local minimum wage. An employee’s position within the salary range will be based on several factors including, but not limited to, specific competencies, relevant education, qualifications, certifications, experience, skills, seniority, geographic location, performance, and business or organizational needs. Additional Information Position Information This is a Career Indefinite position, open to Lab employees and external candidates. Why Lawrence Livermore National Laboratory? Included in 2026 Best Places to Work by Glassdoor! Flexible Benefits Package 401(k) Relocation Assistance Education Reimbursement Program Flexible schedules (*depending on project needs) Our values - visit Security Clearance This position requires a Department of Energy (DOE) Q‑level clearance. If you are selected, we will initiate a Federal background investigation to determine if you meet eligibility requirements for access to classified information or matter. Also, all L or Q cleared employees are subject to random drug testing. Q‑level clearance requires U.S. citizenship. Pre‑Employment Drug Test External applicant(s) selected for this position must pass a post‑offer, pre‑employment drug test. This includes testing for use of marijuana as Federal Law applies to us as a Federal Contractor. Wireless and Medical Devices Per the Department of Energy (DOE), Lawrence Livermore National Laboratory must meet certain restrictions with the use and/or possession of mobile devices in Limited Areas. Depending on your job duties, you may be required to work in a Limited Area where you are not permitted to have a personal and/or laboratory mobile device in your possession. This includes, but not limited to cell phones, tablets, fitness devices, wireless headphones, and other Bluetooth/wireless enabled devices. If you use a medical device, which pairs with a mobile device, you must still follow the rules concerning the mobile device in individual sections within Limited Areas. Sensitive Compartmented Information Facilities require separate approval. Hearing aids without wireless capabilities or wireless that has been disabled are allowed in Limited Areas, Secure Space and Transit/Buffer Space within buildings. Equal Employment Opportunity We are an equal opportunity employer that is committed to providing all with a work environment free of discrimination and harassment. All qualified applicants will receive consideration for employment without regard to race, color, religion, marital status, national origin, ancestry, sex, sexual orientation, gender identity, disability, medical condition, pregnancy, protected veteran status, age, citizenship, or any other characteristic protected by applicable laws. Reasonable Accommodation Our goal is to create an accessible and inclusive experience for all candidates applying and interviewing at the Laboratory. If you need a reasonable accommodation during the application or the recruiting process, please use our online form to submit a request. California Privacy Notice The California Consumer Privacy Act (CCPA) grants privacy rights to all California residents. 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