Jobs in the United States

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Added 1 min ago
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Principal Core Infrastructure Engineer
Oracle
Seattle, WA · Santa Clara, CA · Redwood City, CA
- $114,600 to $234,600 USD / year
–Lead the development and implementation, and begin to architect, components of scalable distributed systems that support horizontal and vertical scaling to meet system demands, including…
Added 5 mins ago
Network Security Engineer
nVent
Bangalore, IN
We are looking for a hands-on Network Security Engineer to operate, enhance, and support enterprise network segmentation and access-control solutions, with a focus on secure and reliable…
Added 6 mins ago
Senior Principal Clinical R&D Engineer - Joints Robotics
J&J Family of Companies
Warsaw, IN
We are searching for the best talent for a Senior Principal Clinical R&D Engineer - Joints Robotics to join our Orthopaedics team. This is a hybrid position that can be based in Boston, MA…
Added 6 mins ago
Principal Process Engineer, Lilly Medicine Foundry
Lilly
Lebanon, IN · Indianapolis, IN
As a Process Engineering Engineer at the entry level, you contribute critical technical input to technology transfer and product launch efforts, collaborating with cross-functional teams to…
Added 6 mins ago
Senior Coronary District Manager - Central North
Medtronic
Indianapolis, IN
…mission-driven innovation, our medical technologies open doors. We support your growth with the training, mentorship, and guidance you need to own your future success. Join us for a career…
Added 13 mins ago
Lead Database Administrator (Remote EST - United States)
Partnerize
Remote, United States
As a database engineer, you will operate with a high degree of autonomy, acting as the principal technical authority and taking end-to-end ownership of our database estate. You will be a…
Added 20 mins ago
Principal Database Engineer IRES - SSFB/HSV
Amentum
Redstone Arsenal, AL
We are looking for a versatile Principal Database Engineer to act as the technical anchor for our database administration team. The Principal Database Engineer supports the Missile Defense…
Added 20 mins ago
VTC Engineer
Koniag Government Services
Huntsville, AL
Koniag Information Technology Systems (KITS), a Koniag Government Services company, is seeking a VTC Engineer with a secret clearance to support our Army customer in Alabama. This position…
Added 27 mins ago
Systems Engineer - E2
Lockheed Martin
Littleton, CO · Littleton
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Added 33 mins ago
Systems Engineer Staff - E4
Lockheed Martin
Littleton, CO · Littleton
Support the program as the Systems Test Lead for production, testing, and verification, post-CDR
Added 33 mins ago
Systems Engineer Senior - E3
Lockheed Martin
Littleton, CO · Littleton
Support the program as the Systems Test Lead for production, testing, and verification, post-CDR
Added 33 mins ago
Systems Engineer Senior Staff - E5
Lockheed Martin
Littleton, CO · Littleton
Prior experience as a Responsible Systems Engineer (RSE) or Certified Principal Engineer (CPE) or Delegate or Integrator role
Added 33 mins ago
Systems Engineer Staff - E4
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Littleton, CO · Littleton
Prior experience as a Responsible Systems Engineer (RSE) or Certified Principal Engineer (CPE) or Delegate or Integrator roles
Added 34 mins ago
Electrical Engineer Sr Stf
Lockheed Martin
Grand Prairie, TX · Grand Prairie
As the Electrical Engineer, you will serve as the principal electrical hardware technical lead across a portfolio of missile, launcher, and sensor programs. Your responsibilities may…
Added 34 mins ago
Systems Engineer Prin - E6
Lockheed Martin
Palmdale, CA · Palmdale
You will be the Systems Engineer Principal for the Systems Engineering team which is responsible for delivering end‑to‑end system solutions.
Added 34 mins ago
Associate Protection & Controls Engineer
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Iron Mountain, MI
The Associate Engineer works under general supervision; coordinates engineering tasks and communicates with other organizational resources to complete project assignments on new or existing…
Added 36 mins ago
An Electronic Network Engineer (Level 2 or 3)
CORP-Corporate Office
United States
This position may be filled either at the Electronic Network Engineer level OR at the Principal Electronic Network Engineer level based on the qualifications listed.***
Added 36 mins ago
Sr. Principal Systems Engineer - Configuration Management
CORP-Corporate Office
United States
Northrop Grumman Aeronautics Systems has an opening for a Staff System Engineer-Configuration Management to join our team of qualified, diverse individuals within our Systems Engineering…
Added 36 mins ago
Principal/ Sr. Principal Electronic Network Engineer
CORP-Corporate Office
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Northrop Grumman Aeronautics Systems is looking to add a Principal or Sr. Principal Electronic Network Engineer to join our team in Rancho Bernardo, CA, The candidate should be a…
Added 36 mins ago
Electronic Engineer - SW Infrastructure
CORP-Corporate Office
United States
Principal Engineer: Bachelor’s Degree in a STEM (Science, Technology, Engineering or Mathematics) discipline and 5 years of related engineering experience; OR a Master’s degree in a STEM…
Added 1 hour ago
J
Principal Offensive Security Engineer
Jobgether
Remote, United States
- $183,000 to $200,000 USD / year
…all applications and next steps. Our partner is looking for a Principal Offensive Security Engineer based in the United…
Added 1 hour ago
Principal Software Engineer/Developer
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Durham, NC
…education equivalent) and five (5) years of experience as a Principal Software Engineer/Developer (or closely related occupation) designing, coding, and implementing high-volume brokerage…
Added 1 hour ago
Principal Software Engineer/Developer
Fidelity Technology Group, LLC
Merrimack, NH
…education equivalent) and five (5) years of experience as a Principal Software Engineer/Developer (or closely related occupation) designing, developing and supporting backend systems using…
Added 1 hour ago
Principal Software Engineer/Developer
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Westlake, TX
…education equivalent) and five (5) years of experience as a Principal Software Engineer/Developer (or closely related occupation) developing and maintaining Web applications using Java and…
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Principal Software Engineer/Developer
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Westlake, TX
…education equivalent) and five (5) years of experience as a Principal Software Engineer/Developer (or closely related occupation) developing and maintaining scalable solutions using Kafka…

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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More about this job

Skills

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

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