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Jobs in California, United States
83 open roles read nightly from companies’ own hiring pages. Each one links to the original ad.
41–60 of 83 jobs
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Sr. Software Engineer, Platform Infrastructure
3 months agoSpaceXSI · Palo Alto, California, United States
Senior$180K – $330K a yearEngineeringDesign, build, and implement a large-scale distributed system that powers one of the world's largest supercomputing clusters; Dive into the low-level stack to profile, debug, and optimize performance across diverse systems, including GPUs, Linux kernel, networking, and…
Technical Account Manager
3 months agoSpaceXSI · Austin, Texas, United States +4
SeniorCustomer success & supportApply expertise to large-scale compute system development, including design validation, integration, performance tuning, and optimization; Act as the primary technical point of contact for compute infrastructure definition, requirements, and delivery across all customer…
Model Engineer, RL Training Framework
3 months agoSpaceXSI · Palo Alto, California, United States
$180K – $400K a yearEngineeringDesign and implement the systems backing all RL workloads at SpaceXSI, from small scale ablations to production training runs; Profile, debug, and optimize end-to-end training performance; Improve scalability and observability of the RL stack
Software Engineer, Data Engineering (X)
3 months agoSpaceXSI · Palo Alto, California, United States
$140K – $225K a yearData & AIDesign, build, and operate production-grade realtime and batch pipelines that ingest, process, validate, and deliver data powering user-behavior insights and product decisions; Create shared datasets, fact tables, and internal data products that let other teams analyze, debug,…
Product Counsel
4 months agoSpaceXSI · Palo Alto, California, United States
HybridSenior$230K – $275K a yearLegal & complianceProvide legal advice to SpaceXSI's product group and engineering teams focusing on AI, personalization, interests, creators, ads, and international expansion. The product groups you will support build AI models as well as features and products that increase engagement by…
Sr. IAM Engineer
4 months agoSpaceXSI · Austin, Texas, United States +3
Senior$152K – $258K a yearEngineeringDesign and implement enterprise-grade IAM solutions across on-prem, cloud, and SaaS environments; Architect and deliver end-to-end federation strategies using modern protocols (SAML, OIDC, OAuth 2.0, SCIM); Lead integration and optimization of key IAM platforms including…
Sr. Model Engineer, RL Inference
4 months agoSpaceXSI · Palo Alto, California, United States
Senior$180K – $400K a yearEngineeringDesign and optimize our inference stack for all shapes of RL workloads at SpaceXSI, from small scale ablations to production training runs; Analyze, profile and address performance bottlenecks in large scale RL systems; Work closely with the modeling team to efficiently…
Software Engineer, Network (C++)
4 months agoSpaceXSI · Palo Alto, California, United States +1
Mid level$140K – $225K a yearEngineeringDevelop routing and traffic-engineering algorithms for the Colossus high-performance datacenter network; Develop highly reliable, real-time software designed to run on the switches that form the backbone of our low-latency, high-bandwidth AI training fabric; Participate in and…
Sr. IT Data Engineer
4 months agoSpaceXSI · Palo Alto, California, United States
Senior$172K – $258K a yearData & AIHelp lead SpaceXSI's data strategy by implementing established ETL patterns, creating and supporting dependable infrastructure, and reusable components; Partner with business and engineering teams to prioritize requests and consistently deliver excellent results against…
Corporate Paralegal
4 months agoSpaceXSI · Austin, Texas, United States +2
$100K – $150K a yearLegal & complianceAssist with forming and maintaining entities, particularly international subsidiary and regulatory filings; Draft board consents and assist in preparing board meeting minutes and materials; Manage corporate record keeping and file management; Track filings and compliance…
Software Engineer, Ads Product
5 months agoSpaceXSI · Palo Alto, California, United States
$140K – $225K a yearEngineeringBuild and ship product features across the X Ads Platform; Work on systems related to ad delivery, targeting, optimization, measurement, and advertiser experience; Use SpaceXSI's infrastructure and AI capabilities to improve the performance and quality of advertising products;…
Software Engineer, Imagine Safety
5 months agoSpaceXSI · New York, United States +2
$140K – $225K a yearEngineeringDesign and implement scalable safety systems for Grok’s media generation platform, including real-time content moderation, risk detection, and safeguard enforcement for images, video, and audio; Build infrastructure to measure, monitor, and mitigate safety risks such as harmful…
Sr. Maching Learning Engineer, Search Ranking
6 months agoSpaceXSI · Palo Alto, California, United States
Senior$180K – $330K a yearEngineeringBuild search and retrieval algorithms that scale to millions of users; Build and operate large scale search engine and search infrastructure; Train state of the art ML ranking models; Integrate Grok in search systems and products
Model Engineer, Post-Training & RL
6 months agoSpaceXSI · Palo Alto, California, United States
$180K – $400K a yearEngineeringDesign and run rigorous experiments that turn research ideas into measurable gains in model capability; Improve model recipes through data quality, deduplication, and mixture experiments; Define what makes RL data and rewards good, including grader design and preventing reward…
Sr. Model Engineer, Multimodal Understanding
6 months agoSpaceXSI · Palo Alto, California, United States
Senior$220K – $357K a yearEngineeringDesign, build, and optimize large-scale distributed systems for multimodal pre-training, post-training, inference, data processing, and tokenization at web/petabyte scale; Develop high-throughput pipelines for data acquisition, preprocessing, filtering, generation, decoding,…
Sr. Software Engineer, Consumer Subscriptions
6 months agoSpaceXSI · Palo Alto, California, United States
Senior$180K – $330K a yearEngineeringOwn the complete billing infrastructure for consumer subscriptions end-to-end, ensuring world-class reliability, security, and scalability; Design and build sophisticated promotional offer infrastructure and internal tools to supercharge the revenue organization; Develop…
Sr. Software Engineer, X Money
6 months agoSpaceXSI · New York, United States +1
Senior$180K – $330K a yearEngineeringDevelop backend services, APIs, and data models to support high-volume, multi-user environments; Work with iOS, Android & Web client engineers to ship products; Design robust infrastructure and microservices for payments, transactions, growth, monetization, and engagement…
Sr. Web Engineer (X)
7 months agoSpaceXSI · Palo Alto, California, United States
Senior$180K – $330K a yearEngineeringOwn and drive features from inception and design to implementation and launch, being the web expert on your team; Build and maintain high-quality, performant products and features, leveraging the most modern and cutting edge web standards, technologies, frameworks, and AI…
Software Engineer, Voice Product
7 months agoSpaceXSI · New York, United States +2
$140K – $225K a yearEngineeringOwn backend engineering for scalable, low-latency voice infrastructure and model integrations; Collaborate directly with Grok Voice model, media, and product teams to deliver end-to-end experiences; Drive performance, reliability, and quality of voice interactions at global…
Model Engineer, Voice
7 months agoSpaceXSI · Palo Alto, California, United States
$160K – $250K a yearEngineeringDesign, build, and maintain large-scale distributed data pipelines that ingest, process, and annotate real-world and synthetic audio, so the training and evaluation systems get reliable, high-quality data; Build and optimize the distributed training infrastructure and software…
Updated 07 Nov 2026 10:21 UTC from the OptiTalent job library.