Jobs in the United States

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Added 4 mins ago
Principal Data Engineer
Applied Systems Canada
UNAVAILABLE
Applied Systems is looking for a Principal Data Engineer to shape the architecturalfoundation of our Data and Analytics capabilities as we scale to enable better insights andlay the…
Added 5 mins ago
Principal Technologist - 90335753 - Remote
Amtrak
United States
The Principal Technologist serves as a senior technical leader responsible for designing, engineering, and implementing innovative technology solutions across Amtrak's enterprise…
Added 6 mins ago
CR
Principal Systems Engineer
Capstone Research Corporation
Dahlgren, VA
- $138,000 to $230,000 USD / year
We have an immediate opening for a Principal Systems Engineer who will support the Missile Defense Agency (MDA) in Dahlgren, VA. This will be a high visibility position for Capstone…
Added 11 mins ago
Director Principal Technical Program Manager, Delivery Enablement and Field Integration, Global Data Centers
Google
Sunnyvale, CA · Atlanta, GA
By pushing labor-intensive assembly, systems integration, and quality testing upstream into controlled factory environments, we enable rapid "square wave" capacity delivery - turning on…
Added 13 mins ago
Principal Data Engineer
Applied Systems, Inc.
UNAVAILABLE
Applied Systems is looking for a Principal Data Engineer to shape the architecturalfoundation of our Data and Analytics capabilities as we scale to enable better insights andlay the…
Added 21 mins ago
Principal Mechanical Engineer
DriSteem
Minneapolis, MN
The Principal Engineer – Mechanical is responsible for technical leadership of engineering teams and projects, driving new product development, overseeing continuation engineering…
Added 23 mins ago
Principal/Senior Principal Systems Engineer *
CORP-Corporate Office
United States
Northrop Grumman Space Systems (NGSP) is seeking an experienced Principal/Senior Principal Systems Engineer supporting our Advanced Tactical Missions Business Unit (BU) to support a program…
Added 23 mins ago
Sr. Principal System Engineer - USAF IFC Manager
CORP-Corporate Office
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Northrop Grumman Aeronautics Systems has an opening for a Senior Principal Systems Engineer to join our team of qualified, diverse individuals within our Systems Engineering organization,…
Added 23 mins ago
Principal Front-Office Engineer - Investments Technology (Private Markets)
Liberty Mutual
Boston, MA
We are seeking a highly skilled and motivated Principal Front-Office Engineer to join our prestigious investment firm. As a Principal Front-Office Engineer, you will work with the Portfolio…
Added 26 mins ago
Network Engineer
Montclair State University
Montclair, NJ
Reporting to the Director of Networking and Telecommunications, the Network Engineer installs, configures, maintains, and upgrades all campus wired and wireless network infrastructure…
Added 27 mins ago
O
Principal Application Software Engineer- Oracle Health
Oracle
United States
- $99,600 to $209,500 USD / year
We are seeking a versatile Principal Application Software Engineer to contribute across platform engineering, cloud infrastructure, distributed systems, application development, integration…
Added 31 mins ago
Principal Engineer Embedded/Sr Principal Engineer Embedded Software
Northrop Grumman
McClellan, CA
As an Engineer of Embedded software you will design, develop, operate and maintain software and firmware components and computing systems software to be applied to and integrated with…
Added 31 mins ago
Embedded Software Engineer/Principal Embedded Software Engineer
Northrop Grumman
McClellan, CA
Northrop Grumman is looking for you to join our team as an Embedded Software Engineer or Principal Embedded Software Engineer in McClellan, CA.
Added 32 mins ago
Principal Guidance Navigation Control Engineer
Northrop Grumman
Manhattan Beach, CA
Northrop Grumman Defense Systems is seeking Principal Guidance Navigation Control Engineer - 20430. This position will be located in Manhattan Beach, CA and will support GSSC.
Added 33 mins ago
Modeling and Simulation Engineer (3/4)
Northrop Grumman
El Segundo, CA
Northrop Grumman Aeronautics Systems has an opening for a Modeling and Simulation Engineer (Principal Engineer or Senior Principal Engineer) to join our team of qualified, diverse…
Added 33 mins ago
Principal RF Test Engineer
Intellisense Systems Inc
Torrance, CA
W e are seeking an exceptional Principal RF Test Engineer to join our Advanced Systems Team. You will lead the development, execution, and improvement of RF test strategies for advanced…
Added 34 mins ago
Principal Research Engineer, AI Systems, DeepMind
Google
Mountain View, CA
Share Principal Research Engineer, AI Systems, DeepMind
Added 34 mins ago
Software Engineer/Principal Software Engineer – Data Analyst
Northrop Grumman
San Diego, CA · Palmdale, CA
Northrop Grumman Aeronautics Systems is looking to add a Software Engineer/Principal Software Engineer- Data Analyst to join our team on site in either in Rancho Bernardo, CA or Palmdale,…
Added 34 mins ago
Systems Engineer/Principal Systems Engineer- San Diego Event
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San Diego, CA
Basic Qualifications Principal Systems Engineer:
Added 35 mins ago
MBSE Systems Engineer Architect (3/4)
Northrop Grumman
El Segundo, CA · San Diego, CA
Northrop Grumman Aeronautics Systems has an opening for a MBSE Systems Architect Engineer to join our team of qualified, diverse individuals within our Research and Advanced Development…
Added 35 mins ago
Principal Cyber Systems Engineer/Sr. Principal Cyber Systems Engineer
Northrop Grumman
San Diego, CA
Northrop Grumman is looking for a Cyber Systems Engineer to support our Systems Engineering Integration & Test (SEIT) department as part of the Connectivity and Networking Solutions (CNS)…
Added 35 mins ago
Principal Systems Engineer - RQ4 FMS Co-CLS Field Facing Integrator
Northrop Grumman
San Diego, CA
Northrop Grumman Aeronautics Systems has an opening for a Principal Systems Engineer - Co-CLS Field Facing Integrator to join our team of qualified, diverse individuals within our Systems…
Added 35 mins ago
DevOps Engineer Level 2/3 (AHT)
Northrop Grumman
Los Angeles, CA
Basic qualifications for a Principal DevOps Engineer 3 (T03):
Added 35 mins ago
Senior Principal Systems Safety Engineer
Northrop Grumman
Los Angeles, CA
Northrop Grumman is seeking a Senior Principal Systems Safety Engineer to work with our Specialty Engineering Team out of Woodland Hills, CA . Our success is grounded in our ability to…
Added 35 mins ago
Principal / Senior Principal Logistics Engineer
Northrop Grumman
Los Angeles, CA
Basic Qualifications Principal Logistics Systems Engineer:

Roblox

Principal Machine Learning Engineer - Matchmaking

San Mateo, CA, United States

$295,250 - $345,040 USD

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Job details

Pay: $295,250 - $345,040 USD
Experience: 8+ years of experience and a consistent record of delivering and improving large-scale ML systems for ranking, recommendation, personalization, or resource allocation.
Posting language: English
Posted: Nov 3, 2026

Original 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.

Matchmaking is a critical stage downstream of Discovery and Search. Once a player chooses a game to play, matchmaking assigns them to a server for that game. That decision shapes who they play with, the network latency they experience, and the quality of their session. By matching players to servers that fit their needs and each developer’s game, matchmaking helps turn discovery into satisfying play, repeat visits, and long-term engagement, making it a direct lever for Roblox’s growth.

As a Principal ML Engineer on Matchmaking, you’ll own the technical vision and execution for the models, objective functions, and algorithms that make those decisions. You’ll combine predictions of high-value player actions with optimization of player and developer utility and system efficiency, serving millions of players across hundreds of thousands of servers in global datacenters.

You Will:

Own the technical direction and ML strategy for matchmaking, connecting the Discovery and Search journey to server placements that improve player experience, developer success, and Roblox growth.
Define and evolve the matchmaking objective function to balance player and developer utility with system efficiency. Make tradeoffs among co-player compatibility, network and join latency, engagement, retention, server utilization, and compute cost explicit and measurable.
Build models that predict high-value actions and longer-term outcomes for each player–server match, including co-play, chat engagement, sustained play, and return visits, using player history, game characteristics, and live server state.
Design and productionize candidate-server retrieval, ranking, and assignment algorithms that optimize this objective under real-time latency, capacity, and reliability constraints, accounting for both the joining player and players already in the server.
Lead other engineers by example and through technical direction as an individual contributor, mentor engineers, and create an engineering culture of excellence.
Build and evolve the data, feature, training, serving, and evaluation systems that support matchmaking ML, ensuring fresh signals, reliable predictions, and consistency between training and serving.
Partner with Discovery, Search, developer-facing product teams, modelers, and data and AI infrastructure engineers to co-design models and systems that adapt to each game’s needs and deliver value across the player journey.
Define offline evaluation and lead online experiments to measure the impact of matchmaking decisions on player engagement and retention, developer success, and system efficiency, using the results to improve models and objectives.
Translate research into iterative production improvements, collaborate with the wider ML community where applicable, and represent Roblox’s technical work.

You Have:

8+ years of experience and a consistent record of delivering and improving large-scale ML systems for ranking, recommendation, personalization, or resource allocation.
Experience defining objective functions, building predictive models, and deploying optimization algorithms that balance user and business outcomes with production latency, reliability, and resource constraints.
The capability of breaking down long-term product requirements into iterative deliverable stages.
Initiated and facilitated challenging technical decisions across multiple teams and organizations. You are empathetic and find common understanding.
Deep technical expertise, you always start with the needs of the user, whether they are Roblox users or internal engineers.
A generalist approach and you have mastered several languages and technologies already; you can easily adapt to any situation.
The ability to roll up your sleeves to tackle data problems or machine learning problems when they come up.
A creative and strategic approach to solving hard problems. You simplify the complex. You bring in fresh ideas from new places.
BS in Computer Science or a related discipline, MS/PhD are a definite plus.

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.

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.

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Skills

Machine learning
ML
Grading systems
Research
Build predictive models
Product comprehension
Computer science

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