23,576 Principal jobs
Principal engineering roles setting technical direction org-wide.
Principal Software Engineer, Agent Infrastructure
Principal engineer on Roblox's Agent Infra team, building the backend infrastructure that runs autonomous AI agents safely and reliably at scale for creators and internal engineers. Core work spans distributed systems design, workflow orchestration, sandboxing untrusted code, and production code in Go, Python, or Rust.
Principal Software Engineer, Languages & Compilers
Principal engineer on Roblox's Programmability team evolving the engine's embedded scripting language (Lua/Luau): designing programming models, APIs, dev tools, and a fast multithreaded runtime, prototyping and owning features end to end in C++. Based onsite in San Mateo, CA (hybrid Tue–Thu).
Principal Network Security Engineer
Principal engineer on Roblox's Network Security pod: identifies vulnerabilities across a global network of data centers and public clouds, designs and builds high-performance protective systems (proxies, load balancers, firewalls, IDS/IPS), and provides security design reviews. Core stack: Golang/C++, TCP/UDP/DNS, DPDK/eBPF.
Principal Reliability Operations Engineer
Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators. At…
Principal Software Engineer, GenAI Platform
Principal engineer on Roblox's Foundation AI team, setting multi-year technical strategy and architecture for the platforms powering machine learning, generative AI, and agentic experiences across Roblox — spanning LLM inference, agent infrastructure, data systems, and developer tooling. Expert-level Go, Python, or Rust plus large-scale distributed systems experience.
Principal Software Engineer
Principal engineer on Roblox's Observability team, owning telemetry, distributed tracing, and logging infrastructure end-to-end — instrumentation libraries, pipelines, storage, and visualization UI — while architecting the next-gen platform ingesting petabytes of data daily and building novel monitoring for AI/ML systems. Hybrid role: 3 days/week at San Mateo HQ.
Sr/Principal Product Manager, Marketplace Discovery and Recommendations
Sr/Principal Product Manager owning the Roblox Marketplace storefront: designing the homepage, its recommendation engine, and ML-driven personalization of avatar-item discovery. Day-to-day means balancing a two-sided creator economy (monetization vs. retention) with engineering, design, and data science.
Principal Data Scientist
Principal Data Scientist at a trust, safety & AI-security company, reporting to VP Engineering. A hands-on senior IC who owns technical direction of real-time content-moderation inference, automated GenAI red-teaming, and the Databricks/PySpark MLOps platform, writing code in Python, Rust, and PySpark and leading LLM safety work end to end.
Principal Data Scientist
Senior IC leadership role owning the technical direction of Alice's Data Science group: real-time multi-tenant content-moderation inference, automated GenAI red-teaming, and the Databricks/Spark lakehouse platform. Hands-on in a large Python, Rust, and PySpark monorepo serving NVIDIA Triton inference and multi-provider LLM systems.
Principal AI Research Cybersecurity Scientist (Israel / UK)
Hands-on principal research scientist role at Alice running rapid research cycles in frontier AI models, LLMs, reasoning, agents, and evaluation — designing benchmarks and translating customer security challenges into research outcomes. Based in Ramat Gan, Israel (UK option), requiring strong publications and advanced Python/PyTorch skills.
Principal AI Research Cybersecurity Scientist (Israel / UK)
Hands-on principal-level researcher running rapid research cycles on frontier AI models, LLMs, agents, and evaluation/benchmarking, translating customer security challenges into experiments, prototypes, and actionable results. Core stack is Python and PyTorch, with a focus on AI security like red teaming and adversarial ML.
Principal Enterprise Strategist
UDT is a national technology solutions provider that modernizes, connects, secures, and manages technology environments for commercial enterprises, state and local governments, and educational institutions. The trusted…
Principal Systems Engineer - APAC
Principal Systems Engineer in Singapore manages and operates bare-metal cloud infrastructure for AI workloads, handling hardware lifecycle, firmware, networking, and OS deployment across large-scale data centers.
Principal Backend Engineer (Forward Deployed)
Leads AI-powered client solutions end-to-end, from discovery through deployment, serving as both engineer and technical consultant. Works with Python, LLM frameworks (LangChain, Hugging Face), FastAPI, Kubernetes, and cloud platforms to build scalable systems from messy data and ambiguous workflows.
Principal Solution Architect, Spatial
Principal solution architect at Water Corporation (Western Australia's public water utility), designing secure, scalable spatial and enterprise technology solutions within the Data & Analytics, Spatial Intelligence team. Leads architecture governance, strategic roadmaps and legacy modernisation; permanent full-time in Leederville with flexible/hybrid working.
Principal Network DevOps Engineer
Principal-level engineer (18-month fixed-term, Sydney CBD with WFH) leading Network-as-Code/IaC automation and CI/CD pipelines for an enterprise network hardening uplift. Hands-on with Cisco ACI/FMC, routing/switching, Python, Ansible, Terraform, and Git while mentoring engineers and setting technical direction.