Top Tech Jobs & Startup Jobs in Los Angeles, CA

Leads daily accounting operations, month-end and year-end close, financial reporting, reconciliations, fixed assets, inventory accounting, internal controls, and audit support. Manages GAAP compliance, accounting systems and process improvements, collaborates cross-functionally, and mentors junior accounting staff. The role is fully onsite in El Segundo and may require extended hours or weekends.

Designs, configures, integrates, and supports ERP finance modules across accounting, FP&A, treasury, procurement, and tax. Responsibilities include ERP configuration, system integrations, SQL reporting, data migration, Tier 2/3 support, financial close support, release testing, SOX controls, audit support, documentation, and process automation. The role requires collaboration between Finance and IT to deliver accurate, scalable, and compliant systems.

Leads deterministic reactor safety analyses for normal, transient, and accident conditions. Develops thermal-hydraulic, fuel performance, source-term, radiological consequence, uncertainty, and sensitivity models. Collaborates across engineering, testing, materials, and regulatory teams to validate models, resolve technical issues, establish safety requirements, and support reactor design, licensing, testing, and regulatory documentation for an advanced portable microreactor.

Leads testing and verification of nuclear reactor components, mechanisms, instrumentation, and subsystems. Owns test planning, procedures, execution, data analysis, documentation, and requirements traceability. Collaborates across nuclear, mechanical, thermal, controls, and test engineering teams to evaluate performance, resolve anomalies, investigate failures, and implement design improvements. Supports reactor operations, commissioning, readiness assessments, and integrated testing for advanced microreactor hardware.

Owns end-to-end design, analysis, manufacturing, supplier development, assembly, and testing of nuclear reactor fluid systems, including primary and power conversion loops, compressors, valves, heat exchangers, and piping. Performs thermal-fluid analysis, trade studies, FMEA, BOM management, requirements development, and test planning. The role is fully onsite in El Segundo and requires 8+ years of fluids-system engineering experience.

Own the end-to-end design, analysis, manufacturing, assembly, and testing of reactor fluid systems, including primary and power conversion loops, compressors, valves, heat exchangers, and piping. Perform thermal-fluid analysis, trade studies, FMEA, supplier selection, BOM management, test planning, and manufacturing support. The role requires close multidisciplinary collaboration and is fully onsite in El Segundo, California, with occasional extended hours and weekends.

Processes and reviews employee travel and expense reports, corporate card transactions, and reconciliations. Ensures accurate coding, policy compliance, documentation, and adherence to applicable government contract cost rules. Supports employees, follows up on missing information, prepares travel spend reports, assists with month-end T&E accruals, and identifies process improvements. The role also helps maintain T&E policies and handles confidential financial information.

Designs and develops critical nuclear reactor mechanisms, including actuators and valves. Responsibilities include trade studies, material selection, thermomechanical and kinematic analysis, CAD-based assembly design, manufacturing and testing, BOM management, supplier development, scheduling, and FMEA. The role requires collaboration across engineering disciplines and ownership of mechanism integration from design through testing. This position is fully onsite in El Segundo and may require extended hours or weekend work.

Supports indirect procurement across IT, facilities, MRO, professional services, consumables, and R&D. Responsibilities include supplier evaluation, sourcing, SOW and contract support, purchase order tracking, vendor coordination, cost and quality analysis, technical supply chain risk identification, and process improvement. The role partners with engineering, operations, finance, and production, requiring strong mechanical aptitude, analytical skills, communication, and willingness to work onsite with occasional supplier travel.

Owns manufacturing and inspection processes for complex nuclear reactor components and assemblies. The role drives DFM/DFA, develops and qualifies production processes, creates manufacturing documentation and tooling, resolves defects, supports suppliers, and improves production repeatability, yield, throughput, cost, and scalability. Requires hands-on collaboration with design, quality, test, supply chain, technicians, and production personnel in a fully onsite environment.