Runtime Engineer jobs in United States
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Lemurian Labs · 2 days ago

Runtime Engineer

positionSan Francisco, CA
timeFull-time
remoteHybrid
seniorityMid, Senior Level
date4+ years exp

Lemurian Labs is on a mission to bring the power of AI to everyone while ensuring sustainability. The Runtime Engineer will design and improve a multi-target runtime, optimize performance for AI applications, and collaborate with the product team to address the needs of ML engineers.

Artificial Intelligence (AI)Cloud ManagementInfrastructureMachine Learning
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H1B Sponsor Likelynote

Responsibilities

Design, develop, maintain and improve our multi-target runtime
Use the latest techniques in parallelization and partitioning to automate generation and exploit highly optimized kernels
Rapid prototyping and data driven exploration of new ideas
Benchmark and analyze the outputs produced by our optimizing compiler on target hardware
Work closely with our product team to understand the evolving needs of ML engineers and drive improvements in architecture
Build tools to collect and analyze performance bottlenecks

Qualification

C/C++ programmingAsynchronous programmingHW architecture knowledgeGPU programmingHigh performance computingDL frameworks knowledgeConcurrent programmingKernel developmentHypervisor developmentProgramming large compute clusters

Required

A deep understanding of asynchronous, concurrent programming
4+ years of experience with C/C++ (C++14 or newer)
An understanding of HW architecture (vector vs scalar registers and instructions, memory hierarchies)
Knowledge of operating system kernel development or hypervisor development

Preferred

Experience developing or maintaining libraries like CUDA or ROCm
Experience with GPU programming
Experience with high performance computing (HPC)
Masters or PhD degree in computer science, or equivalent practical experience
Knowledge of DL frameworks such as PyTorch, JAX or Triton
Experience with programming large compute clusters

Benefits

Equity
Company bonus opportunities
Medical, dental, and vision benefits
Retirement savings plan
Supplemental wellness benefits

Company

Lemurian Labs

twittertwitter
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Any workload. Any hardware. Any scale.
dateFounded in 2018
location
Santa Clara, California, USA
people-size11-50 employees
web-link
https://www.lemurianlabs.com

H1B Sponsorship

Lemurian Labs has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)

Funding

Current Stage
Early Stage
Total Funding
$43.14M
Key Investors
Oval Park CapitalSilicon CatalystventureLAB
2025-12-03Series A· $28M
2024-10-09Convertible Note· $6M
2023-09-08Seed· $9M

Leadership Team

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Jay Dawani
Co-Founder & CEO
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Recent News

alleywatch.com
The Weekly Notable Startup Funding Report: 12/8/25
2025-12-09
Pulse 2.0
Lemurian Labs: $28 Million Series A Raised To Accelerate Hardware Agnostic AI
2025-12-09
SuperbCrew
Lemurian Labs Raises $28M In Series A Funding Round
2025-12-08
Company data provided by crunchbase