Job description

Shape the Future of AI At Labelbox, we're building the critical infrastructure that powers breakthrough AI models at leading research labs and enterprises. Since 2018, we've been pioneering data-centric approaches that are fundamental to AI development, and our work becomes even more essential as AI capabilities expand exponentially. About Labelbox We're the only company offering three integrated solutions for frontier AI development: Enterprise Platform & Tools : Advanced annotation tools, workflow automation, and quality control systems that enable teams to produce high-quality training data at scale Frontier Data Labeling Service : Specialized data labeling through Alignerr, leveraging subject matter experts for next-generation AI models Expert Marketplace : Connecting AI teams with highly skilled annotators and domain experts for flexible scaling Why Join Us High-Impact Environment : We operate like an early-stage startup, focusing on impact over process. You'll take on expanded responsibilities quickly, with career growth directly tied to your contributions. Technical Excellence : Work at the cutting edge of AI development, collaborating with industry leaders and shaping the future of artificial intelligence. Innovation at Speed : We celebrate those who take ownership, move fast, and deliver impact. Our environment rewards high agency and rapid execution. Continuous Growth : Every role requires continuous learning and evolution. You'll be surrounded by curious minds solving complex problems at the frontier of AI. Clear Ownership : You'll know exactly what you're responsible for and have the autonomy to execute. We empower people to drive results through clear ownership and metrics. Role Overview Alignerr is Labelbox's human data organization — we produce the training data that frontier AI labs use to build their most capable models. Our Forward Deployed Research Team sits at the intersection of research science and client delivery, embedding research capability directly into the engagements that drive our business. This is not a traditional research scientist role. You will not spend months pursuing a single research question. You will work on multiple client engagements simultaneously, operating on timescales of days to weeks. You will sit in scoping meetings with research teams at major AI labs, reason scientifically about data strategy in real time, fine-tune open-weight models to validate our data methodology, and collaborate with our Applied Research team to turn client-grounded findings into published work. The pace is fast, the problems are applied, and the feedback loops are short. We are looking for someone who finds that energizing, not compromising. Your Impact Engage directly with frontier lab research teams. You will be in the room during client scoping meetings — not as support staff, but as a technical peer. You'll engage on methodology, challenge assumptions about data requirements, and shape project specifications based on a scientific understanding of how data composition affects model outcomes. Develop deep scientific understanding of client engagements. For each project, you will build a working model of the client's architecture, training methodology, and target capabilities. You'll use this understanding to reason about why a particular data strategy will or won't work, identify risks early, and iterate with empirical grounding — not intuition. Run ablation studies and fine-tune open-weight models. You will fine-tune models on client data (and proxy data) to empirically measure the impact of our data on model performance. This is how we validate that what we deliver actually improves our customers' models — and how we catch problems before the client does. Consult on workflow and quality systems. You will partner with our Human Data Operations team to review annotation schemas, task designs, and quality rubrics before projects go into execution. Your job is to ensure the spec is technically sound — that the data we produce will actually serve the client's training objectives. Collaborate with Applied Research on publications and benchmarks. Our Applied Research team owns the long-horizon research agenda. Your role is to feed them signal from the field — generalizable findings, reusable methodologies, empirical results — and help drive joint projects to completion. You will contribute to benchmarks, white papers, and conference submissions that establish Labelbox's research credibility. What You Bring Required MS or PhD in Machine Learning, NLP, Computer Science, or a related quantitative field. Hands-on experience fine-tuning large language models (open-weight models such as Llama, Mistral, Qwen, or similar). Strong understanding of LLM training pipelines — pretraining, supervised fine-tuning, RLHF/DPO, and how data quality and composition affect each stage. Experience designing and executing experiments with rigor — hypothesis formation, controlled comparisons, statistical analysis of results. Ability to operate at speed. You should be comfortable going from problem definition to experimental results in days, not months. Strong written and verbal communication. You will present findings to client research teams and contribute to published work. Strongly Preferred Prior experience at a frontier AI lab, applied ML startup, or in a research role with direct client/stakeholder interaction. Experience with evaluation and benchmarking of LLMs — designing metrics, building eval harnesses, interpreting results critically. Familiarity with human data pipelines — annotation workflows, quality assurance methodology, inter-annotator agreement analysis. Experience with reinforcement learning, reward modeling, or RLHF environments. Published research (conferences, journals, or technical reports) in ML/NLP or adjacent fields. What Matters More Than Credentials Applied instinct over academic purity. The measure of success here is client impact and publishable-but-practical results — not methodological novelty for its own sake. If your first instinct when handed a problem is to build a framework, this isn't the role. If your first instinct is to run an experiment and get a result, it is. Comfort with ambiguity and incomplete information. Client engagements rarely come with clean problem statements. You'll need to extract the real question from a noisy conversation, scope an approach quickly, and iterate. Cross-functional fluency. You will work daily with field engineers, project managers, operations teams, and an independent Applied Research team. Someone who can only operate within a pure research silo will struggle here. Intellectual honesty. When an ablation study shows the data isn't working, you need to say so — clearly and constructively — even when it's inconvenient for the deal timeline. What You Should Know About This Team We are small and high-leverage. The FDRT is a team of five today. Every person's work directly influences client outcomes and Labelbox's market position. We operate at the tempo of client delivery. Two-week sprints. SLAs measured in days. If you want months of uninterrupted focus on a single problem, our Applied Research team is a better fit. We are at the intersection of several teams. FDRT works with Field Delivery Engineers, Human Data Operations, Applied Research, and client research teams. The role requires navigating those interfaces with credibility and without ego. We protect time for research. 25–30% of team capacity is allocated to research collaboration with Applied Research. This is not aspirational — it is a structural commitment. You will have the opportunity to publish. Labelbox strives to ensure pay parity across the organization and discuss compensation transparently. The expected annual base salary range for United States-based candidates is below. This range is not inclusive of any potential equity packages or additional benefits. Exact compensation varies based on a variety of factors, including skills and competencies, experience, and geographical location. Annual base salary range $200,000 — $300,000 USD Life at Labelbox Environment : Fast-paced and high-intensity, perfect for ambitious individuals who thrive on ownership and quick decision-making Growth : Career advancement opportunities directly tied to your impact Vision : Be part of building the foundation for humanity's most transformative technology Our Vision We believe data will remain crucial in achieving artificial general intelligence. As AI models become more sophisticated, the need for high-quality, specialized training data will only grow. Join us in developing new products and services that enable the next generation of AI breakthroughs. Labelbox is backed by leading investors including SoftBank, Andreessen Horowitz, B Capital, Gradient Ventures, Databricks Ventures, and Kleiner Perkins. Our customers include Fortune 500 enterprises and leading AI labs. Your Personal Data Privacy : Any personal information you provide Labelbox as a part of your application will be processed in accordance with Labelbox’s Job Applicant Privacy notice . Any emails from Labelbox team members will originate from a @labelbox.com email address. If you encounter anything that raises suspicions during your interactions, we encourage you to exercise caution and suspend or discontinue communications.

Requirements

Must-haves

Shape the Future of AI
We are looking for someone who finds that energizing, not compromising.
MS or PhD in Machine Learning, NLP, Computer Science, or a related quantitative field.
Hands-on experience fine-tuning large language models (open-weight models such as Llama, Mistral, Qwen, or similar).
Strong understanding of LLM training pipelines — pretraining, supervised fine-tuning, RLHF/DPO, and how data quality and composition affect each stage.
Experience designing and executing experiments with rigor — hypothesis formation, controlled comparisons, statistical analysis of results.
Ability to operate at speed. You should be comfortable going from problem definition to experimental results in days, not months.
Strong written and verbal communication. You will present findings to client research teams and contribute to published work.
Prior experience at a frontier AI lab, applied ML startup, or in a research role with direct client/stakeholder interaction.
Experience with evaluation and benchmarking of LLMs — designing metrics, building eval harnesses, interpreting results critically.
Familiarity with human data pipelines — annotation workflows, quality assurance methodology, inter-annotator agreement analysis.
Experience with reinforcement learning, reward modeling, or RLHF environments.
Published research (conferences, journals, or technical reports) in ML/NLP or adjacent fields.
What Matters More Than Credentials
Comfort with ambiguity and incomplete information. Client engagements rarely come with clean problem statements. You'll need to extract the real question from a noisy conversation, scope an approach quickly, and iterate.
Intellectual honesty. When an ablation study shows the data isn't working, you need to say so — clearly and constructively — even when it's inconvenient for the deal timeline.
What You Should Know About This Team
We are small and high-leverage. The FDRT is a team of five today. Every person's work directly influences client outcomes and Labelbox's market position.
We operate at the tempo of client delivery. Two-week sprints. SLAs measured in days. If you want months of uninterrupted focus on a single problem, our Applied Research team is a better fit.
We protect time for research. 25–30% of team capacity is allocated to research collaboration with Applied Research. This is not aspirational — it is a structural commitment. You will have the opportunity to publish.
Environment : Fast-paced and high-intensity, perfect for ambitious individuals who thrive on ownership and quick decision-making
Growth : Career advancement opportunities directly tied to your impact
Vision : Be part of building the foundation for humanity's most transformative technology

Nice-to-haves

Strongly Preferred

Application prep

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Keywords to mirror

aigomachine learningllmml

Platform: greenhouse
Effort: quick

Benefits

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Vision