Senior Machine Learning Engineer

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November 25

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Upwork

WebsiteLinkedInAll Job Openings

B2B • Marketplace

Upwork is a leading online platform that connects freelancers with businesses, offering a wide range of professional services such as design, writing, programming, and more. It facilitates collaboration between independent professionals and clients through job postings, project catalogs, and consultations. Upwork aims to enable freelancers to find work and clients to find the best talent, providing tools to hire, manage, and pay remote talent worldwide.

501 - 1000 employees

Founded 2015

🤝 B2B

🏪 Marketplace

💰 Funding Round on 2017-01

📋 Description

• Train/Finetune large language models for query understanding and tool calling. • Develop and utilize vector databases and/or knowledge graphs for information retrieval. Orchestrate information retrieval using databases in the loop. • Investigate model explainability to enhance reliability and reduce hallucination in end-to-end Uma use cases. • Collaborate cross-functionally with machine learning engineers to take models from research to production. • Stay current with the latest advancements in Gen-AI and integrate relevant innovations into our systems. • Publish paper in top-tier conference. Mentor junior engineers, conduct code reviews, and enforce engineering best practices. • Deliver high-quality solutions that improve overall efficiency.

🎯 Requirements

• 5+ years of hands-on experience designing, training, and deploying deep learning models, specifically in areas related to Natural Language Processing (NLP) and Information Retrieval. • Proven experience in finetuning or pre-training LLMs (e.g., Llama, GPT family, Mistral) for specific downstream tasks like query understanding and instruction following. • Expert-level proficiency in PyTorch for building, training, and optimizing complex deep learning models. • Direct experience developing and implementing models capable of structured output generation (e.g., JSON, YAML) and tool/function calling (giving the model the ability to interact with external systems or databases). • Experience in designing, implementing, and orchestrating complex AI Agents or multi-step reasoning workflows using LLMs. • Practical knowledge of applying RL principles, particularly in the context of RLHF, for aligning LLMs with human preferences, improving model safety, and enhancing instruction-following capabilities.

🏖️ Benefits

• Upwork is proudly committed to fostering a diverse and inclusive workforce. We never discriminate based on race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical condition), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. • A criminal background check may be run on a candidate after a conditional offer to perform your services for Upwork is made. Qualified applicants with arrest or conviction records will be considered in accordance with applicable law, including the California Fair Chance Act and local Fair Chance ordinances.