---
title: 'Principal Machine Learning Infrastructure Engineer, Ads & Discovery at Roblox'
canonical: 'https://feeny.ai/job/principal-machine-learning-infrastructure-engineer-ads-discovery-roblox-san-4j8jsbftyqe1'
type: 'job'
last_seen: '2026-09-09'
---

# Principal Machine Learning Infrastructure Engineer, Ads & Discovery at Roblox

- **Company:** Roblox
- **Location:** San Mateo CA, United States
- **Compensation:** $295k–$345k
- **Posted:** 2025-10-24
- **Last confirmed live:** 2026-09-09
- **Apply:** https://careers.roblox.com/jobs/7351202?gh_jid=7351202

## Job description

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 Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there.

A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone.

With Roblox Ads & Discovery business growing at a rapid rate, we are building large scale ads machine learning infrastructure to deliver more value to our users and our advertisers.

As a Machine Learning Infrastructure Engineer, you’ll build scalable, reliable, and high-performance infrastructure that powers ML systems across our organization. You’ll operate at the scales of hundreds of billions of engagements, and redefine how we deliver performance ads to hundreds of millions of users.

You will:

- You will co-design models and systems, working at the intersection of model architecture and ML infrastructure, partnering closely with core modelers, data and AI infrastructure engineers, and product teams to push the boundaries of large-scale training and serving. Your work will span recommendation, search, and agentic applications, including large transformer architectures, LLMs, generative rankers, and efficient offline and online content-understanding systems.
- You will investigate model, data, and systems tradeoffs end to end—from data pipelines and distributed training to low-latency inference and production serving. This includes designing efficient KV-cache strategies, applying pruning and quantization, optimizing GPU utilization and memory efficiency, and developing custom kernels where needed.
- You are comfortable working across modern ML systems technologies such as FSDP, vLLM, SGLang, CUDA, distributed training frameworks, inference engines, and GPU kernels, while remaining tool-agnostic and focused on achieving step-function improvements in model quality, throughput, latency, reliability, and cost.
- Lead strategic planning and roadmap execution of scalable production-ready ML systems including model training, data pipelines, feature engineering and model inference.
- Own the architecture, establish engineering best practices of scalability, reliability, and cost-effectiveness of ML infrastructure (e.g., training, serving, feature).
- Work closely with data scientists, ML engineers, platform teams, and product stakeholders to design, implement, and operate robust ML platforms that accelerate model development and deployment.
- Stay abreast of industry trends in machine learning and infrastructure to ensure the adoption of leading-edge technologies and practices.

You have:

- 5+ years of experience designing, building, and deploying large-scale machine learning systems in production environments.
- 3+ years of experience tech leading ML infrastructure engineers
- Strong communication skills and a collaborative approach to problem solving.
- BS, MS, or Ph.D. in Computer Science, Engineering, or equivalent experience.

For roles that are based at our headquarters in San Mateo, CA: The starting base pay for this position is as shown below. The actual base pay is dependent upon a variety of job-related factors such as professional background, training, work experience, location, business needs and market demand. Therefore, in some circumstances, the actual salary could fall outside of this expected range. This pay range is subject to change and may be modified in the future. All full-time employees are also eligible for equity compensation and for benefits as described on [this page](https://careers.roblox.com/total-rewards).

Annual Salary Range $295,250—$345,040 USD

Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted).

Roblox provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Roblox also provides reasonable accommodations to candidates with qualifying disabilities or religious beliefs during the recruiting process.

For US based roles only, please note the Company may not be able to employ candidates for this role who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.

## About Roblox

## Company Overview
- **One-liner**: Roblox is a global platform where millions of people create, play, and connect in immersive 3D experiences built by a community of developers and creators.
- **Entity Type**: Public (NYSE: RBLX)
- **Headquarters**: San Mateo, California, United States
- **Founded**: 2004
- **Founders**: David Baszucki and Erik Cassel

## Core Business
- Primary industry: Online gaming platform and creation system
- Target customers: B2C (players, especially children and teens) and B2B (creators/developers who build experiences)
- Mission: “Reimagine the way people come together” and “connect a billion people with optimism and civility”

## Products & Services
- **Roblox Platform**: An immersive 3D experience where users can play millions of user-generated games and social experiences. Accessible on mobile, console, desktop, and web.
- **Roblox Studio**: Free, powerful creation tool that allows developers to build, publish, and monetize their own 3D experiences using Lua scripting.
- **Roblox Economy**: Virtual currency (Robux) used to purchase in-experience items, avatar accessories, and developer products. Developers earn real money through the Developer Exchange program.
- **Safety & Moderation Systems**: Multiple layers of content moderation including text filtering, safe training data, and Vision-Language Models to enforce Community Standards.

## Market Standing
- **Valuation/Market Cap**: As a public company, market cap fluctuates. Recent reports place it around $30–35 billion (early 2026).
- **Key Metric**: Over 150 million daily active users (DAU) and 45 million concurrent users (greater than the population of Canada). Annual revenue for 2024 was approximately $3.5 billion.
- **Notable Investors/Partners**: Public shareholders; major institutional investors include Vanguard, BlackRock, and others. Strategic partners include Sony, Walmart, and various entertainment brands.
- **Growth Signals**: Scaling toward a goal of 1 billion users; expanding into AI with generative AI and 3D foundation models; opening a new immersive Careers Experience on the platform; strong early-career hiring and internship programs.

## Competitive Advantages
- **Massive Network Effects**: The more creators build, the more players join, attracting even more creators. This flywheel is difficult for competitors to replicate.
- **User-Generated Content Ecosystem**: Roblox Studio empowers millions of creators to generate endless fresh content, keeping the platform sticky and diverse.
- **Safety by Design**: Proactive, layered moderation and AI-driven safety features build trust with parents and regulators.
- **Cross-Platform Ubiquity**: Seamless experience across mobile, desktop, console, and web, reaching a broad global audience.

## Strategic Focus
- **AI & Machine Learning**: Investing heavily in generative AI tools for creators, machine learning systems for the economy, and 3D foundation models.
- **Scaling Infrastructure**: Building backend services and data centers capable of supporting a billion users.
- **Immersive Experiences**: Expanding beyond gaming into social, education, commerce, and live events (e.g., concerts, brand activations).
- **Creator Monetization**: Enhancing tools and revenue-sharing to attract and retain top developers.

## Why Work Here
- **Culture & Values**: “Respect the Community, Take the Long View, Be Responsible, Get Stuff Done.” Emphasis on innovation, continuous learning, and ownership.
- **Work Model**: Hybrid – onsite Tuesday, Wednesday, Thursday in San Mateo; optional Monday and Friday.
- **Compensation & Benefits**: Competitive base salary (e.g., Senior Fullstack Engineer: $242,100–$293,800), plus equity and comprehensive benefits focusing on health, wealth, and happiness.
- **Career Growth**: Early ownership, mentorship from industry leaders, and the chance to ship features to hundreds of millions of users. Interns work on real projects that often go live.
- **Assessment-First Hiring**: Early-career roles use skills-based assessments (coding, problem-solving, decision-making) to reduce bias and level the playing field.
- **Diverse Technical Challenges**: Work across AI, real-time communication, massive data processing, 3D rendering, and more.

## Sources
1. [careers.roblox.com](https://careers.roblox.com/) – Careers homepage, values, and culture
2. [about.roblox.com/engineering](https://about.roblox.com/engineering) – Engineering overview and roles
3. [about.roblox.com/newsroom/2026/01/now-live-the-immersive-roblox-careers-experience](https://about.roblox.com/newsroom/2026/01/now-live-the-immersive-roblox-careers-experience) – 2026 Careers Experience announcement
4. [careers.roblox.com/early-career](https://careers.roblox.com/early-career) – Early career programs and assessment process
5. [careers.roblox.com/jobs/7540814](https://careers.roblox.com/jobs/7540814) – Senior Software Engineer, Fullstack job posting

## Other roles at Roblox

- [Head of Developer Relations, SEA and OCE](https://feeny.ai/job/head-of-developer-relations-sea-and-oce-roblox-singapore-n6xrebcjgvam) — Singapore
- [Senior Software Engineer, Creator Core Systems](https://feeny.ai/job/senior-software-engineer-creator-core-systems-roblox-san-mateo-ca-dpf2bvxzmn4j) — San Mateo CA, United States
- [Senior Engineering Manager, Ads Data Platform](https://feeny.ai/job/senior-engineering-manager-ads-data-platform-roblox-san-mateo-ca-5kz516hv5j79) — San Mateo CA, United States
- [Senior Counsel, Litigation](https://feeny.ai/job/senior-counsel-litigation-roblox-san-mateo-ca-hymdm4szt3yr) — San Mateo CA, United States
- [IT Support Technician](https://feeny.ai/job/it-support-technician-roblox-san-mateo-ca-zbv0nahpm1wp) — San Mateo CA, United States
- [Privacy & Security Counsel](https://feeny.ai/job/privacy-security-counsel-roblox-san-mateo-ca-a6qebkpkqj6d) — San Mateo CA, United States
- [Senior Software Engineer, Sharing](https://feeny.ai/job/senior-software-engineer-sharing-roblox-san-mateo-ca-2qz4gm24esbs) — San Mateo CA, United States
- [Brand and Ad Operations Specialist](https://feeny.ai/job/brand-and-ad-operations-specialist-roblox-san-mateo-ca-1qvz04fj5apm) — San Mateo CA, United States
- [Senior Software Engineer, Data Engineering (Short Term)](https://feeny.ai/job/senior-software-engineer-data-engineering-short-term-roblox-san-mateo-ca-wbc8hmm03yh5) — San Mateo CA, United States
- [Revenue Operations Manager](https://feeny.ai/job/revenue-operations-manager-roblox-san-mateo-ca-jmj1vqr2b0jn) — San Mateo CA, United States