Jobs in the United States

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Added 1 min ago
Senior Data Engineer
Ciklum
United States
Ciklum is looking for a Senior Data Engineer to join our team full-time in the US .
Added 19 mins ago
Recent Graduate-Process Engineer – Advanced Semiconductor Packaging
Keysight Technologies, Inc.
Santa Rosa, CA
…electronic design, simulation, prototyping, test, manufacturing, and optimization. Our ~15,000 employees create world-class solutions in communications, 5G, automotive, energy, quantum,…
Added 19 mins ago
Recent Graduate-Process Engineer – Semiconductor Wafer Fabrication
Keysight Technologies, Inc.
Santa Rosa, CA
…Frequency Technology Center (HFTC) is seeking an R&D Process Engineer to develop, maintain and optimize manufacturing processes to fabricate passive silicon interposer substrates for…
Added 19 mins ago
O
Senior Platform Software Engineer - OCI
Oracle
Dover, DE
- $92,500 to $209,500 USD / year
Oracle Cloud Infrastructure (OCI) is looking for a Senior Platform Software Engineer to join the PKI team responsible for building and operating cloud-scale Public Key Infrastructure…
Added 19 mins ago
Software Engineer, Systems ML
Meta
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Meta is seeking a Software Engineer to join our Systems ML Engineering team, focused on building and optimizing the machine learning infrastructure that powers Meta's products at massive…
Added 19 mins ago
Account Manager II
Arrow Electronics
Leipsic, DE
Added 20 mins ago
Sr Site Reliability Engineer -Remote US
SitusAMC
Dover, DE
…operational coverage of environments and continuously look for optimization, reengineering, and efficiency to ensure the products running on the cloud as a SaaS offering to our clients are…
Added 20 mins ago
Senior Financial Planning & Analysis Manager
Cornerstone OnDemand
Wilmington, DE
Support software capitalization analysis with Accounting and track engineering efficiency metrics (e.g., R&D as a percent of revenue, cost per engineer)
Added 20 mins ago
Frontend Engineer
GN Hearing
Dover, DE
Help create seamless digital experiences that support people on their hearing journey. As a Frontend Engineer , you will build and evolve customer-facing web experiences for Jabra Enhance,…
Added 20 mins ago
C
Lead Data Engineer-Snowflake
Cognizant
Dover, DE
- $115,000 to $135,000 USD / year
As a Lead Data Engineer – Snowflake , you will make an impact by designing and delivering scalable, high-performance data solutions that enable critical business insights and operational…
Added 20 mins ago
Supply Chain Capacity Engineer
Meta
Dover, DE
Meta is seeking a Planning & Capacity Engineer to join the Infrastructure Supply Chain and Engineering (ISCE) Planning team to focus on planning optimization for all of Meta’s…
Added 26 mins ago
MI
Software Engineer
Metron, Inc.
Aurora, CO
- $130,000 to $250,000 USD / year
…backgrounds for complex and challenging projects. As a Software Engineer you will be responsible for developing, maintaining, and enhancing complex and diverse software systems (e.g.,…
Added 30 mins ago
Senior Engineer
Samsung Austin Semiconductor, LLC.
Austin, TX
…component-based design; Low level performance profiling and optimization; and GPU APIs such as Vulkan, OpenGL, OpenCL, ANGLE. Employer will accept skills gained in pursuit of…
Added 39 mins ago
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Senior Platform Software Engineer - OCI
Oracle
Juneau, AK
- $92,500 to $209,500 USD / year
Oracle Cloud Infrastructure (OCI) is looking for a Senior Platform Software Engineer to join the PKI team responsible for building and operating cloud-scale Public Key Infrastructure…
Added 39 mins ago
Account Manager II
Arrow Electronics
Juneau, AK
Added 53 mins ago
AI Phone - Applied ML / Model Engineer
Bjak
Remote, United States
- Experience with model fine-tuning, such as SFT, LoRA/QLoRA, and preferably RL or preference optimization.
Added 53 mins ago
AI Phone - On-device AI / ML Systems Engineer
Bjak
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Added 53 mins ago
AI Phone - Agentic Engineer
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Added 53 mins ago
AI Phone - Senior Agent Runtime Engineer
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- Experience with model routing and inference optimization.
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AI Phone - Senior Android System Engineer
Bjak
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- Strong debugging and performance optimization skills.
Added 59 mins ago
Software Engineer (Edge - Devices & Mobile)
Jobgether
Remote, United States
…applications and next steps. Our partner is looking for a Software Engineer (Edge – Devices & Mobile) based in United…
Added 1 hour ago
Product Sourcing Engineer (Electronic Focused)
Anduril Industries
Costa Mesa, CA
Product Sourcing Engineer (Electronics Focused)
Added 1 hour ago
Product Sourcing Engineer (Batteries/Energy/Etc..)
Anduril Industries
Costa Mesa, CA
Product Sourcing Engineer (Batteries/Energy/Etc.)
Added 1 hour ago
AI Phone - Applied ML / Model Engineer
Bjak
Remote, United States
- Experience with model fine-tuning, such as SFT, LoRA/QLoRA, and preferably RL or preference optimization.
Added 1 hour ago
A
Senior Architectural Millwork Engineer
AlphaX
Naples, FL
- $110,000 to $130,000 USD / year
We are seeking an experienced Senior Architectural Millwork Engineer to join our team and lead the technical design and engineering of our high-end custom millwork projects from concept…

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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