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Senior Machine Learning Engineer- LLMs & Self-Hosted AI Navan - Business Travel Solutions & Expense Management Navan - Business Travel Solutions & Expense Management Platform Travel Business Travel Management See how to manage all corporate travel in one place. Program Management Advanced Analytics Navan Rewards Sustainability Travel Services Support Personal Travel Expense Navan Edge Payments Intelligence Integrations Security & Trust Business Travel Management See how to manage all corporate travel in one place. Program Management Travel Services Advanced Analytics Navan Rewards Sustainability Support Personal Travel Expense Management Control, manage, and track expenses. Navan Edge Meet your personal assistant for work trips. Payments Use Navan cards or bring your own corporate card. Intelligence Integrations Security & Trust Your browser does not support the video tag. Introducing Navan Edge Early access The new standard for frequent travelers: tailored, rewarding, effortless. 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Introducing Navan Edge Early access The new standard for frequent travelers: tailored, rewarding, effortless. Region France Germany Netherlands Spain United Kingdom United States Get started Request a demo Log In France Germany Netherlands Spain United Kingdom United States Log In Log In Log In Senior Machine Learning Engineer- LLMs & Self-Hosted AI Location: Tel-Aviv, Israel Department: Engineering We are looking for a highly skilled Senior Machine Learning Engineer to lead our transition from on-demand, third-party LLM APIs to a fully self-hosted, scalable model ecosystem. Our core product is an advanced, agentic support chatbot capable of complex reasoning, API tool calling, database lookups, and orchestrating specialized Small Language Models (SLMs) for targeted NLP tasks. As we scale, our current deployment infrastructure (AWS SageMaker) is becoming unsustainable. You will be responsible for architecting, deploying, and optimizing an infrastructure capable of supporting 50 to 100 distinct models ranging from 100M to 70B parameters. What You’ll Do: Inference Optimization: Deploy and manage large-scale models using high-performance inference engines (like vLLM) to ensure low latency and high throughput for our agentic chatbot. Agentic Workflows: Develop and refine the chatbot's agentic capabilities, ensuring reliable tool-use, routing, and interactions between massive LLMs and specialized SLMs. Model Fine-Tuning: Design and execute fine-tuning strategies to improve model accuracy on specific domain tasks and tool-calling execution. Rigorous Evaluation: Build comprehensive offline and online evaluation frameworks to constantly measure model performance and business impact through structured A/B testing. What We’re Looking For: Core Engineering & AI Frameworks Strong proficiency in Python and Bash scripting. Deep experience with PyTorch and the Hugging Face ecosystem. Experience using AI coding assistants natively in the terminal, specifically Claude Code , to accelerate development workflows. LLMs, Inference & Agents Proven experience deploying models using vLLM , TGI, or similar high-performance inference servers. Strong fundamental understanding of LLM architectures, attention mechanisms, and generation parameters. Hands-on experience building Agentic systems (ReAct, function/tool calling, RAG). Expertise in fine-tuning strategies (e.g., SFT, RLHF, DPO) and parameter-efficient techniques (PEFT/LoRA). Statistics & Model Evaluation Offline Metrics: Deep understanding of classification/summarization metrics (Precision, Recall, F1, AUC) and retrieval metrics (MRR, NDCG, Precision/Recall @ k). Online Metrics & A/B Testing: Strong statistical foundation to design and analyze A/B tests safely, including the use of t-tests, Mann-Whitney U tests, and bootstrapping techniques. Bonus Points Containerization & Orchestration: Experience with Ray for orchestrating large-scale model deployments across multi-GPU clusters. Model Quantization: Experience with memory optimization techniques like AWQ, GPTQ, GGUF, or FlashAttention to fit 70B models efficiently onto hardware. API Development: Proficiency in building robust, asynchronous microservices using FastAPI to serve model requests. Knowledge of Data Engineering principles: dataset collection, cleaning, processing, and scalable storage. Experience with core MLOps practices , including dataset versioning (e.g., DVC), experiment tracking (e.g., Weights & Biases, MLflow), and model registries . About Navan Navan (Nasdaq: NAVN) is the leading all-in-one business travel , payments, and expense management platform that makes travel easy for frequent travelers. From finding flights and hotels to automating expense reconciliation, with 24/7 support along the way, Navan delivers an intuitive experience travelers love and finance teams rely on. See how Navan customers benefit and learn more at navan.com . Culture of Excellence Our team is our competitive edge — a high-performance group of smart, driven people committed to winning together. This dedication to excellence is why we’ve been recognized as a Best Place to Work by Built In (2023–2026), a G2 Best Global Software Company (2025-2026), a CNBC Disruptor 50 (2022-2025), and a Forbes Fintech 50 (2022-2025). At Navan, we provide an environment where top talent excels, offering the autonomy and fast-paced trajectory needed to build a defining career and do the best work of your life. Our Benefits Navan offers a comprehensive benefits program designed to support your well-being, financial security, and life outside of work. Our benefits, thoughtfully tailored by country to meet local needs, include healthcare coverage, insurance offerings, and wellness resources for you and your family. We support long-term financial growth through retirement savings programs and opportunities to participate in our equity plans, so you can share in Navan’s success. To promote balance, we offer flexible time off, country-specific holidays, and paid parental leave for all new parents. Additional benefits include connectivity and commuting support, mental health resources, and exclusive travel-related perks. Wherever you’re based, our benefits evolve with you. Workplace Policy Navan believes in the value of in-person connections, whether that’s sitting down to have lunch with one another, taking a walking 1:1, or collaborating in a room together. The connections forged through face-to-face interactions improve company culture and drive business results. Navan invests in global office spaces — in the U.S., Europe, and Asia, among others — that feel welcoming. In-office perks such as company-provided lunches and happy hours create a strong team environment to help you do your best work. Our employees work from the office four days a week. Please expect this policy for all roles that are tied to an office. Equal Opportunity Navan is an equal opportunity employer. We make all employment decisions based solely on merit. We provide equal employment opportunity to all applicants and employees without discrimination on the bases of race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), 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. We prohibit any such discrimination or harassment. This policy applies to all terms and conditions of employment, including hiring. Accommodations Navan complies with the Americans with Disabilities Act (ADA), as amended by the ADA Amendments Act, and all applicable state or local law. Navan will reasonably accommodate qualified individuals with a disability in connection with applications for employment as required by law. If you need any assistance or accommodations due to a disability, you are welcome to email us at [email protected] . Candidate Privacy Notice Please review Navan's Candidate Privacy Notice here . Job Search Best Practices We have been made aware of recruitment scams involving fraudulent attempts to lure job seekers into sending money or personal information in return for fake job offers or coerce them into purchasing equipment by electronic funds transfer (Zelle, Venmo, etc.) Legitimate Navan recruiters will never ask for money in any recruitment or onboarding activities. All available job openings at Navan will be posted on Navan’s website and all Navan recruiters will be reachable through an email address ending in “@navan.com” or “@navan.tech” or "@talent.navan.com". Product Business Travel Expense Management Advanced Analytics Navan Rewards Sustainability Navan Edge New Solutions Enterprises Small Business Accounting Teams Executive assistants Finance Teams Travel Managers Travelers By Industry Energy and Utilities Financial Services Food and Beverages Health and Wellness Industrial and Manufacturing Media and Entertainment Professional Services Real Estate and Construction Retail and Ecommerce Technology and Software Resources Guides Compare Us Blog Travel and Expense Glossary Per Diem Calculator Mileage Calculator Customers Case Studies Help Center Customer Resources End-User Resources Customer Reviews Company About Us Partners Careers Contact Us 4.7 out of 5 | 9K+ reviews return ( ); Region France Germany Netherlands Spain United Kingdom United States Website Terms of Use Privacy Security Accessibility Statement Modern Slavery Statement Status Your Privacy Choices © 2026 Navan The Navan card is issued by Celtic Bank (Member FDIC), Stripe Technology Europe Limited, Stripe Payments UK Limited, Adyen N.V. (EU), Adyen N.V. San Francisco Branch (US), and Adyen N.V. London Branch (UK) About Navan Navan is the global AI-powered business travel and expense management platform that makes travel easy for frequent travelers. powering travel programs at more than 10,000 companies, including Canva , HelloFresh , DoorDash, Duolingo , and Steelcase. The platform simplifies travel, payments, and expense management with intuitive tools for booking, automated payments with built-in virtual cards, and seamless expense reporting. Navan delivers exceptional customer satisfaction , with a 96% CSAT and 43 NPS. Founded in 2015 by Ariel Cohen and Ilan Twig as TripActions, Navan reported $613M in LTM revenue and $7.6B in LTM gross booking volume, each for the twelve months ended July 31, 2025. The company aims to empower organizations worldwide to make corporate travel smarter and more efficient. Learn more at navan.com . Product Business Travel Expense Management Advanced Analytics Navan Rewards Sustainability Navan Edge New Solutions Enterprises Small Business Accounting Teams Executive assistants Finance Teams Travel Managers Travelers By Industry Energy and Utilities Financial Services Food and Beverages Health and Wellness Industrial and Manufacturing Media and Entertainment Professional Services Real Estate and Construction Retail and Ecommerce Technology and Software Resources Guides Compare Us Blog Travel and Expense Glossary Per Diem Calculator Mileage Calculator Customers Case Studies Help Center Customer Resources End-User Resources Customer Reviews Company About Us Partners Careers Contact Us 4.7 out of 5 | 9K+ reviews return ( ); Region France Germany Netherlands Spain United Kingdom United States Website Terms of Use Privacy Security Accessibility Statement Modern Slavery Statement Status Your Privacy Choices © 2026 Navan The Navan card is issued by Celtic Bank (Member FDIC), Stripe Technology Europe Limited, Stripe Payments UK Limited, Adyen N.V. (EU), Adyen N.V. San Francisco Branch (US), and Adyen N.V. London Branch (UK) About Navan Navan is the global AI-powered business travel and expense management platform that makes travel easy for frequent travelers. powering travel programs at more than 10,000 companies, including Canva , HelloFresh , DoorDash, Duolingo , and Steelcase. The platform simplifies travel, payments, and expense management with intuitive tools for booking, automated payments with built-in virtual cards, and seamless expense reporting. Navan delivers exceptional customer satisfaction , with a 96% CSAT and 43 NPS. Founded in 2015 by Ariel Cohen and Ilan Twig as TripActions, Navan reported $613M in LTM revenue and $7.6B in LTM gross booking volume, each for the twelve months ended July 31, 2025. The company aims to empower organizations worldwide to make corporate travel smarter and more efficient. Learn more at navan.com .