Research Engineer, Evaluations, Applied AI

AI is changing how the world communicates — and LILT is leading that transformation.

We're on a mission to make the world's information accessible to everyone, regardless of the language they speak. We use cutting-edge AI, machine translation, and human-in-the-loop expertise to translate content faster, more accurately, and more cost-effectively without compromising on brand, voice, or quality.

At LILT, we empower our teammates with leading tools, global collaboration, and growth opportunities to do their best work. Our company virtues—Work together, win together; Find a way or make one; Quicker than they expect; Quality is Job 1—guide everything we do. We are trusted by Intel Corporation, Canva, the United States Department of Defense, the United States Air Force, ASICS, and hundreds of global Enterprises. Backed by Sequoia, Intel Capital, and Redpoint, we’re building a category-defining company in a $50B+ global translation market being redefined by AI.

About The Role

As a Research Engineer focused on Model Evaluation, you are the final arbiter of technical quality for our frontier AI deliverables. You will design sophisticated evaluation suites and serve as the lead calibrator, reviewing and refining the contributions of other engineers to ensure our data samples and model outputs meet the exacting standards of the world’s leading AI labs.

This is a highly technical role for someone who enjoys getting in the weeds of model behavior, RAG performance, and RLHF alignment.

Key Responsibilities

• Eval Architecture & Benchmarking: Design and implement automated and human-in-the-loop evaluation frameworks to measure model performance across multiple modalities (text, code, image, etc.).
• Calibration & Peer Review: Act as the Gold Standard reviewer for other engineers. You will calibrate their data generation and evaluation contributions, providing technical feedback to ensure scientific consistency and high-fidelity output.
• Frontier Sample Generation: Write and refine complex prompts and golden response pairs for frontier-model training, specifically focusing on edge cases in reasoning and multilingual contexts.
• Quality Control (End-to-End): Develop the logic for multi-modal QC checks, ensuring that high-volume data samples are correct across diverse domains and languages.
• Technical Mentorship: Bring new knowledge and best practices to our established delivery and forward-deployed engineering teams on model evaluations.

• Education: B.S. in Computer Science, AI, or a related field or 5+ years of relevant experience in a high-growth AI/Research environment.
• Deep Technical Proficiency: Expert-level Python skills and hands-on experience with modern AI frameworks (PyTorch, Transformers, LangChain/LlamaIndex).
• Evaluation Experience: Experience building model evaluation suites (e.g., MMLU-style benchmarks, custom RAG metrics, or human-preference alignment).
• Domain Expertise: Deep understanding of RAG architectures, vector database retrieval logic, and agentic workflows. Experience with RLHF/RLAIF environments and the mechanics of preference signaling/reward modeling.
• Multimodal & Multilingual Rigor: Experience handling data quality at scale across different languages and modalities (images, video, or audio).
• Precision- and Quality-Orientation: You find bugs in model reasoning that others miss. You are comfortable being the final quality arbiter for technical deliverables that others produce.

• Fluency in multiple languages (highly preferred for multilingual model calibration).
• Experience in Frontier Labs or high-tier AI research environments.
• At least one of: a portfolio of research contributions, an example of evals or “model-breaking” samples, or use of open-source AI evaluation tools.

Our founders, Spence and John met at Google working on Google Translate. As researchers at Stanford and Berkeley, they both worked on language technology to make information accessible to everyone. While together at Google, they were amazed to learn that Google Translate wasn’t used for enterprise products and services inside the company.The quality just wasn’t there. So they set out to build something better. LILT was born.

LILT has been a machine learning company since its founding in 2015. At the time, machine translation didn’t meet the quality standard for enterprise translations, so LILT assembled a cutting-edge research team tasked with closing that gap. While meeting customer demand for translation services, LILT has prioritized investments in Large Language Models, human-in-the-loop systems, and now agentic AI.

With AI innovation accelerating and enterprise demand growing, the next phase of LILT’s journey is just beginning.

Our Tech

What Sets Our Platform Apart

• Brand-aware AI that learns your voice, tone, and terminology to ensure every translation is accurate and consistent
• Agentic AI workflows that automate the entire translation process from content ingestion to quality review to publishing
• 100+ native integrations with systems like Adobe Experience Manager, Webflow, Salesforce, GitHub, and Google Drive to simplify content translation
• Human-in-the-loop reviews via our global network of professional linguists, for high-impact content that requires expert review

• Featured in The Software Report’s Top 100 Software Companies!
• LILT makes it onto the Inc. 5000 List.
• LILT’s continues to be an intellectual powerhouse, holding numerous patents that help power the most efficient and sophisticated AI and language models in the industry.
• Check out all our news on our website.

At LILT, we are committed to a fair, inclusive, and transparent hiring process. As part of our recruitment efforts, we may use artificial intelligence (AI) and automated tools to assist in the evaluation of applications, including résumé screening, assessment scoring, and interview analysis. These tools are designed to support human decision-making and help us identify qualified candidates efficiently and objectively. All final hiring decisions are made by people. If you have any concerns, require accommodations, or would like to opt-out of the use of AI in our hiring process, please let us know at [email protected].

LILT is an equal opportunity employer. We extend equal opportunity to all individuals without regard to an individual’s race, religion, color, national origin, ancestry, sex, sexual orientation, gender identity, age, physical or mental disability, medical condition, genetic characteristics, veteran or marital status, pregnancy, or any other classification protected by applicable local, state or federal laws. We are committed to the principles of fair employment and the elimination of all discriminatory practices.