23,576 Principal jobs
Principal engineering roles setting technical direction org-wide.
Senior/Principal Product Manager, Video Generation (Roblox Reality)
Senior/Principal Product Manager at Roblox who owns the strategy, launch, and creator controls for the Roblox Video Model — generative video world models paired with the game engine — taking it from lab demo to creator early access to a scaled platform capability on cloud GPU infrastructure.
Principal Software Engineer, Creator Game Operations
Roblox is hiring a Principal Software Engineer on the Creator Success Team to build mission-critical backend services supporting game creators, including ML-driven player insights pipelines, creator communication tools, and a remote config/experimentation platform. The role involves leading technical decisions at massive scale using C#, Java, or Go and distributed systems, based onsite in San Mate
Principal Machine Learning Engineer, Alt Defense
Technical lead for Roblox's Alt Defense pod, architecting large-scale ML systems (graph neural networks, clustering) that detect banned bad actors returning with alternate accounts across billions of accounts, in near real time. Onsite in San Mateo, working with Python-scale ML, big data, and low-latency serving.
Principal Software Engineer, Ads User Experience
Principal software engineer building Roblox's first-of-its-kind ads system inside its C++ game engine — developing new ad formats starting with video, and designing high-performance, scalable systems that shape a new multi-billion-dollar ads business while preserving user experience and platform integrity.
Principal Client Platform Engineer
Roblox is hiring a Principal Client Platform Engineer to act as the technical architect for its global fleet of macOS, Windows, Linux, Android, iOS, and ChromeOS endpoints. Day to day they define fleet security/management strategy, automate patching, OS upgrades and certificate lifecycles, harden endpoint security with tools like CrowdStrike and Kolide, and mentor engineers.
Principal Endpoint Platform Engineer
Serves as the technical architect for Roblox's global corporate endpoint fleet (macOS, Windows, Linux, iOS, Android, ChromeOS), defining strategy for scaling, security, and automation — patching, OS upgrades, certificate lifecycles, and observability tools like CrowdStrike and Kolide. Core tech: endpoint management platforms (Jamf Pro, Intune), Python/Bash/Go/Ruby, IaC/GitOps, Okta Zero Trust, and
Principal Software Engineer - Avatar Personalization
Principal engineer on Roblox's Avatar Personalization team, building avatar creation and customization features (animation, clothing, hair, shading) directly in the Roblox game engine using C++ and Lua, with technical leadership and cross-team architectural work at scale for tens of millions of users. Onsite in San Mateo Tue-Thu.
Principal Product Manager, Subscriptions and Revenue Growth
Senior product leader at Roblox owning the end-to-end strategy and roadmap for Roblox Premium subscriptions — defining subscriber value proposition, tiering, and pricing, running growth experimentation to drive acquisition and retention, and building developer-led subscription benefits. Requires deep consumer subscription/growth PM experience, A/B testing expertise, and cross-functional influence.
Principal Software Engineer- Agentic Customer Care
Principal engineer on Roblox's Trust & Safety 'Safety Experience' team, building agentic, LLM-powered applications and chatbot solutions for customer-facing and internal safety systems at scale. The role provides technical leadership and mentoring, working with C#/Java/Python, microservices, REST/RPC, and machine learning.
Principal Software Engineer, Build Platform
Principal engineer setting the technical direction for Roblox's Build Platform — the cloud-hosted agent harness, tools/skills, and evaluation framework behind AI-powered game creation. Day-to-day spans designing distributed agent infrastructure, LLM orchestration and multi-provider model routing, sandboxed execution, evals at scale, and reliability/safety/cost systems.
Principal Software Engineer, Build
Principal engineer on Roblox's Build Surfaces team, leading end-to-end development of AI-assisted creator tools across Roblox Studio and the app — text-to-game generation, iteration, monetization, and analytics — while mentoring engineers. Primarily works in React, Luau, and occasionally C++.
Principal Software Engineer - Object Store
Principal engineer setting the technical direction for Roblox's in-house, bare-metal, S3-compatible object storage platform that serves assets, media, analytics and ML datasets at exabyte scale, migrating workloads off cloud object storage. Day to day: distributed storage architecture and data-path tuning in C++, Go, or Rust, control-plane and fleet operations, plus mentoring.
Principal Software Engineer, App Performance
Principal engineer on Roblox's Consumer App Performance team, driving stability and performance across the cross-platform C++ game engine and client codebase on mobile, desktop, and console — profiling bottlenecks, mitigating crashes and hangs, and building monitoring and CI/CD guardrails to prevent regressions.
Principal Software Engineer, Engine Systems
Principal engineer on Roblox's Engine DataModel team, owning the core data structures, C++ reflection bindings behind the Luau API, and serialization that form the backbone of the Roblox engine. Day to day is high-performance systems-level C++ work that must run well across desktop, mobile, and console clients, based hybrid (3 days/week) in San Mateo, CA.
Principal Software Engineer, Core Services
Principal engineer on Roblox's Core Services team, building and evolving the shared C#/.NET and Rust frameworks, libraries, and runtime infrastructure behind Roblox's global platform. Day-to-day is hands-on systems work across performance, concurrency, API design, and managed/native interop, plus technical leadership and mentoring.
Principal Machine Learning Platform Engineer, Foundation AI
Principal engineer who owns Roblox's internal ML platform as a product — building serving layers, model registries, pipeline orchestrators, and training/inference control planes exposed via APIs, SDKs, CLIs, and UIs. Blends backend engineering, developer experience, and large-scale GPU infrastructure work.
Principal Applied AI Engineer
Hands-on leadership role at CINC (community-management platform) to lead a remote-first team building Cephai-powered AI features like agent orchestration, retrieval systems, and intelligent automation. Core stack: Python/TypeScript, LangGraph/LangChain, OpenAI/Anthropic/Bedrock APIs, AWS/GCP cloud-native services.
Principal Data Scientist - Safety
Principal-level data scientist on Roblox's Content Safety team, building prevalence measurement methodologies, ground truth datasets, and causal-inference analyses to quantify and reduce harmful user-generated content across games, avatars, and in-game behaviors. Core stack includes Python/R, SQL, Hive, Spark, and Airflow, partnering with Product, Engineering, Policy, and Legal.
Principal Software Engineer - Streaming
Principal engineer on Roblox's Engine Networking team, building the real-time network transport layer that synchronizes game state across millions of players on desktop, mobile, and console clients. Core work is systems-level C++ on a user-space network stack, optimizing latency, throughput, congestion control, and OS-level performance on Linux.
Principal Software Engineer - Service Networking
Principal engineer on Roblox's Service Mesh team: sets technical direction and does hands-on development of Envoy/Istio-based service-to-service networking across Kubernetes, Nomad, and cloud environments, partnering with Security and Compute teams while mentoring senior engineers.