LMArena

Machine Learning Scientist - Open Source Lead

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LMArena is seeking a Machine Learning Scientist to lead open-source research, advancing how AI models are evaluated and understood. This role involves designing, running, and sharing new methods and experiments to reveal model utility, trustworthiness, and capability, grounded in human preference signals. You will curate high-impact datasets, develop new methodologies and reproducible benchmarks, and release code to push AI evaluations forward. Your work will shape the public leaderboard, power community tools, and strengthen transparency in AI evaluation worldwide.

Senior Software Engineer, Data Infrastructure

<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">About the Role:</h2>LMArena is looking for a Machine Learning Scientist to lead our open-source research, including open data set and code releases, advancing how the world evaluates and understands AI models in the open. You’ll design, run, and share new methods and experiments that reveal what makes models useful, trustworthy, and capable, grounded in human preference signals and released openly for the full ecosystem and research community to build upon.In this role, you’ll be responsible for taking our commitment to openness from principle to practice, curating high-impact datasets, developing new methodology and reproducible benchmarks, and releasing code that enables the research ecosystem to push AI evaluations forward. Your work will shape the public leaderboard, power community tools, and strengthen transparency in AI evaluation worldwide.This role is deeply interdisciplinary, working with engineers, product teams, marketing, and the broader research community to advance how we compare models, analyze preference data, and understand factors like style, reasoning, and robustness. You’ll work closely with GTM teams as our spokesperson when it comes to outreach for our open research efforts: strengthening research partnerships, expanding research community participation, and championing programs that grow and support our research network.If you’re excited by open-ended questions, rigorous evaluation, and scientific communication and outreach, you’ll find a meaningful home here. We’re looking for:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Hands-on experience training large-scale models, including reward models, preference models, and fine-tuning LLMs with methods like RLHF, DPO, and contrastive learning.</li><li class="leading-relaxed">Strong foundation in ML and statistics, with a track record of designing novel training objectives, evaluation schemes, or statistical frameworks to improve model reliability and alignment.</li><li class="leading-relaxed">Fluent in the full experimental stack, from dataset design and large-batch training to rigorous evaluation and ablation, with an eye for what scales to production.</li><li class="leading-relaxed">Deeply collaborative mindset, working closely with engineers to productionize research insights and iterating with product teams to align research with user needs.</li><li class="leading-relaxed">Comfortable being a visible representative of LMArena, engaging openly with the research community, and building a strong personal brand to help shape AI research culture.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Responsibilities:</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Design and conduct experiments to evaluate AI model behavior across reasoning, style, robustness, and user preference dimensions</li><li class="leading-relaxed">Develop new metrics, methodologies, and evaluation protocols that go beyond traditional benchmarks</li><li class="leading-relaxed">Analyze large-scale human voting and interaction data to uncover insights into model performance and user preferences</li><li class="leading-relaxed">Communicate results with the broader research community via academic papers, educational content, conference talks</li><li class="leading-relaxed">Collaborate with engineers to implement and scale research findings into production systems</li><li class="leading-relaxed">Prototype and test research ideas rapidly, balancing rigor with iteration speed</li><li class="leading-relaxed">Partner with model providers to shape evaluation questions and support responsible model testing</li><li class="leading-relaxed">Contribute to the scientific integrity and transparency of the LMArena leaderboard and tools</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Who is LMArena?</h2>Created by researchers from <a href="https://sky.cs.berkeley.edu/" target="_blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">UC Berkeley’s SkyLab</a>, LMArena is an open platform where everyone can easily access, explore and interact with the world’s leading AI models. By comparing them side by side and casting votes for the better response, the community helps shape a public leaderboard, making AI progress more transparent, and grounded in real-world usage.<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Why Join Us?</h2>Trusted by organizations like Google, OpenAI, Meta, xAI, and more, LMArena is rapidly becoming essential infrastructure for transparent, human-centered AI evaluation at scale. With over one million monthly users and growing developer adoption, our impact is helping guide the next generation of safe, aligned AI systems—grounded in open access and collective feedback.Our work is regularly referenced by industry leaders pushing the frontier of safe and reliable AI. <a href="https://x.com/sundarpichai/status/1899779090472644881" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Sundar Pichai</a>, <a href="https://x.com/JeffDean/status/1819121162578022849" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Jeff Dean</a>, <a href="https://x.com/elonmusk/status/1827055547599712757" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Elon Musk</a>, and <a href="https://x.com/sama/status/1815877987696533897" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Sam Altman</a>.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">High Impact: Your work will be used daily by the world’s most advanced AI labs.</li><li class="leading-relaxed">Global Reach: Develop data infrastructure powering millions of real-world evaluations, influencing AI reliability across industries at the top-tier</li><li class="leading-relaxed">Exceptional Team: We are a small team of top talent from Google, DeepMind, Discord, Vercel, UC Berkeley, and Stanford.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Requirements:</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">PhD or equivalent research experience in Machine Learning, Natural Language Processing, Statistics, or a related field</li><li class="leading-relaxed">Uses personal and professional platforms to amplify open research initiatives and invite collaboration.</li><li class="leading-relaxed">Strong understanding of LLMs and modern deep learning architectures (e.g., Transformers, diffusion models, reinforcement learning with human feedback)</li><li class="leading-relaxed">Proficiency in Python and ML research libraries such as PyTorch, JAX, or TensorFlow</li><li class="leading-relaxed">Demonstrated ability to design and analyze experiments with statistical rigor</li><li class="leading-relaxed">Experience publishing research or working on open-source projects in ML, NLP, or AI evaluation</li><li class="leading-relaxed">Comfortable working with real-world usage data and designing metrics beyond standard benchmarks</li><li class="leading-relaxed">Ability to translate research questions into practical systems and collaborate across engineering and product teams</li><li class="leading-relaxed">Passion for open science, reproducibility, and community-driven research</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">What we offer:</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">The cash compensation for this position has not yet been finalized. Actual compensation will depend on job-related knowledge, skills, experience, and candidate location.</li><li class="leading-relaxed">Competitive salary and meaningful equity</li><li class="leading-relaxed">Comprehensive healthcare coverage (medical, dental, vision)</li><li class="leading-relaxed">The opportunity to work on cutting-edge AI with a small, mission-driven team</li><li class="leading-relaxed">A culture that values transparency, trust, and community impact</li></ul>Come help build the space where anyone can explore and help shape the future of AI.<a href="https://jobs.ashbyhq.com/lmarena/c499927c-0385-4a78-99b5-895914b7596c/application" target="_blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Apply for this Job</a>This site is protected by reCAPTCHA and the Google <a href="https://policies.google.com/privacy" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Privacy Policy</a> and <a href="https://policies.google.com/terms" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Terms of Service</a> apply.

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Atomic Cartoons is seeking an Unreal Previs Artist, CG, to join their team in Vancouver. The role involves creating 3D sequences and animatics in Unreal Engine, making decisions on camera placement and staging, and providing basic character animation. Candidates should have prior Unreal Previs experience, a strong grasp of cinematography, and excellent communication skills. The position offers remote, hybrid, or in-studio options within BC and includes comprehensive benefits.

Atomic Cartoons Inc. is an award-winning animation studio with locations in Vancouver's Mt. Pleasant Animation District, Ottawa's Hintonburg neighborhood and Los Angeles. Since its inception over 25 years ago, Atomic Cartoons has created and produced numerous 2D and CG animation productions including Super Team Canada, Mermicorno Starfall, Princess Power and Last Kids on Earth. Atomic is well known for its artist-friendly culture and flexible work environment. We are always looking for artists of all levels to join our team!Atomic Cartoons is always looking to recruit talented and enthusiastic additions to our team.

CG Core Pipeline Developer

Are you a Previs Artist with prior experience working in Unreal Engine? We are looking for you to join our team on one of our exciting new Unreal projects!---Atomic Cartoons Inc. is an award-winning animation studio with locations in Vancouver's Mt. Pleasant Animation District, Ottawa's Hintonburg neighborhood and Los Angeles. Since its inception over 25 years ago, Atomic Cartoons has created and produced numerous 2D and CG animation productions including Super Team Canada, Princess Power and Last Kids on Earth. Atomic is well known for its artist-friendly culture and flexible work environment. We are always looking for artists of all levels to join our team!---<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">WHAT YOU WILL DO:</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Use Boards, Scripts or director briefs to create and compile 3d sequences and animatics in Unreal Engine.</li><li class="leading-relaxed">Create basic assets in Unreal Engine.</li><li class="leading-relaxed">Make decisions regarding camera placement and staging, lenses, and framing to support the narrative and create dynamic sequences.</li><li class="leading-relaxed">Provide basic animation for characters and assets to guide story and framing.</li><li class="leading-relaxed">Perform live reviews in Unreal Engine with key stakeholders.</li><li class="leading-relaxed">Work collaboratively while taking and implementing direction and feedback from the Supervisor and/or Director.</li><li class="leading-relaxed">Deliver timely, high-quality results while adhering to production pipelines and schedules.</li><li class="leading-relaxed">Be updated and familiar with new related and relevant technologies.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">WHAT WE ARE LOOKING FOR:</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Prior working experience on projects in Unreal as a Previs Artist.</li><li class="leading-relaxed">A strong grasp of cinematography principles, composition, and aspect ratios.</li><li class="leading-relaxed">Strong Understanding of composition, staging, and camera movement.</li><li class="leading-relaxed">Excellent attention to detail.</li><li class="leading-relaxed">Strong communication and interpersonal skills.</li><li class="leading-relaxed">Excellent verbal, written, and e-social communication skills.</li><li class="leading-relaxed">Knowledge of the episodic animation production pipeline is an asset.</li><li class="leading-relaxed">Currently legally eligible to work in Canada.</li></ul>START DATE: October 2025<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Applicants must have resided within BC as of December 31, 2024 and be able to provide the appropriate supporting documents.</li><li class="leading-relaxed">All Atomic employees in this role have the opportunity to work remotely within BC, artists within Vancouver and the Lower Mainland can also choose hybrid and in-studio options.</li></ul>---At Atomic Cartoons and Thunderbird Entertainment, we take into consideration a wide range of compensation factors including background, skills, location, and experience to determine competitive pay. In addition to competitive pay, this position is eligible for company-sponsored benefits including medical, GRSP, vacation pay, paid holiday break, paid leave, and a variety of other discounts and perks. Please note: This expected pay range is for British Columbia and is not applicable to locations outside of the province of British Columbia.Wage ranges are based on a weekly rate.Vancouver Pay Range$1,200 - $1,700 CAD---INTERESTED?Atomic Cartoons Inc. and Thunderbird Entertainment welcome and encourage applications from people with disabilities. Accommodations are available on request for candidates taking part in all aspects of the selection process.We thank you for your submission; only short-listed candidates will be contacted. No phone calls, please.---Atomic Cartoons is an equal opportunity employer and employs personnel without regard to race, ancestry, place of origin, colour, ethnic origin, language, citizenship, creed, religion, gender, sexual orientation, age, marital status, physical and/or mental handicap or financial ability.While remaining sensitive, fair, and providing equitable treatment for all, Atomic Cartoons works to increase participation and advancement to reflect all personnel – including Women, Indigenous People, Visible Minorities, and Persons with Disabilities, who are all qualified members. Thus, it helps identify and remove barriers that prevent the full participation of members of designated groups in the workplace.

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This assessment gives us an idea of your C++ skills- Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc.- 10 Multiple Choice questions- Average time to complete: 7 to 10 minutes

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