June 17, 2026

Data Scientist II

Mid • Remote

120,000 - 144,996 USD/yr

Reno, NV

Position Overview

At LivePerson, the Data Scientist II helps advance Conversational AI by applying research and experimentation with Large Language Models (LLMs) to real-world customer interactions. This role designs and executes applied research initiatives, develops effective prompting and orchestration strategies using deep knowledge of transformer architectures, and optimizes modern LLM inference and retrieval pipelines. The scientist analyzes large-scale conversational datasets to improve Retrieval-Augmented Generation (RAG) systems and builds robust experimentation frameworks for evaluating non-deterministic model outputs. Working closely with other scientists and cross-functional teams, this role translates insights on model behavior into recommendations that inform product and business strategy while staying at the forefront of Generative AI advancements.

Key Responsibilities & Impact

  • Propose, plan, and execute applied research initiatives using Large Language Models (LLMs) in a commercial setting.
  • Apply expert knowledge of Transformer architecture mechanics (Attention, Tokenization, Embeddings) to develop effective and explainable prompting and orchestration approaches.
  • Utilize modern LLM inference and retrieval pipelines.
  • Analyze large-scale conversational datasets for RAG optimization.
  • Implement research-driven prompt strategies within production systems.
  • Create flexible scientific evaluation frameworks for non-deterministic model outputs.
  • Present findings on model behavior and context efficacy to guide product and business strategy.
  • Collaborate closely with other scientists.
  • Stay current with advancements in Generative AI.

Required Skills & Qualifications

  • Master’s degree in Computer Science, Artificial Intelligence, Computational Linguistics, Operations Research, Industrial Engineering, or related field plus two (2) years of experience as a data scientist.
  • Two (2) years of experience in:
    • Python programming
    • Designing LLM interaction flows, evaluation frameworks, or advanced prompting strategies
    • Deploying GenAI/LLM solutions into production with engineering teams
  • One (1) year of experience in:
    • Generative AI, LLMs, RAG, and Semantic Search/Vector Databases
    • Advanced prompting techniques (Chain-of-Thought, Few-Shot)
    • Dialogue systems and context management
    • LLM orchestration frameworks (LangChain / LangGraph)
    • Transformer architectures (Attention mechanisms, Context Windows, Tokenization constraints)
    • SQL

Salary range: $120,000 to $145,000 USD. Final compensation is based on location, skills, experience, education, and certifications.

Our Benefits & Perks

Health & Wellbeing

  • Medical, Dental, and Vision Insurance
  • Wellness resources and Employee Assistance Program (EAP)

Financial Security & Growth

  • 401(k) Retirement Plan with 4% employer match
  • HSA & FSA plans
  • Employee Stock Purchase Program (ESPP)
  • Life, AD&D, disability, legal, identity theft, and critical illness insurance
  • Professional development resources

Time Away & Family Support

  • Flexible Paid Time Off (PTO)
  • Paid public holidays
  • Generous parental leave policy

Workplace Flexibility

  • Fully remote role with optional WeWork space access

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Hybrid

Warsaw, Poland

🏢 Summary: The offer is for a Data Scientist responsible for designing, building, and deploying machine learning and AI solutions that drive marketplace performance at scale. The role covers end-to-end model development, from problem formulation to production, using advanced statistical methods, deep learning, and Generative AI on large-scale data in cloud environments. You will work closely with data engineers and business stakeholders to deliver impactful, production-grade ML systems. 🗂️ Requirements: Experience in data analysis using SQL, Experience building and deploying ML models in production environments, End-to-end experience designing machine learning models, Ability to translate business problems into ML solutions, Strong communication skills with business stakeholders, Experience with ML and AI, especially LLMs, Proficiency in Python, Understanding of statistical and machine learning methods, Practical and theoretical knowledge of Generative AI and Agentic AI, English and Polish proficiency at B2+ level, Degree in Mathematics, Physics, Economics, Computer Science or related field, or equivalent ML/Data Science experience 📃 Skills: Python, SQL, GCP, BigQuery, VertexAI, CloudComposer, Dataflow, Airflow, PySpark, LLM, GenAI, AgenticAI, DeepLearning, Bayesian, Boosting, CausalInference, Optimization, Kubernetes, Docker, Consul, GitHub, GitHubActions, Gemini, GPT 🏢 Description: Data Scientist Location: Warszawa, PL, 00-841 Company: Allegro sp. z o.o. Team: Technology Contract Type: Employee We are looking for a Data Scientist with a strong analytical mindset - someone who enjoys decoding market mechanisms and applying statistical models to solve complex platform puzzles. Our team drives the logic that powers a trustworthy and competitive marketplace. As part of the Tech organization dedicated to delivering the best experiences for our sellers, we specialize in data solutions focused on driving their growth - particularly through optimizing price competitiveness, expanding product selection, and supporting strategic campaigns. Composed of Data Scientists, Data Engineers, and Analysts, we develop statistical models and rules to measure and improve our products and services. We work in close collaboration with developers and product teams across the entire project lifecycle, from ideation to implementation. Our ultimate goal is to create a seamless experience where partners can rely on fair visibility rules, and Customers can trust every product detail they see on the platform. The brain of the entire Allegro. Here, we implement projects based on a practical application of artificial intelligence and Data Science on a scale unprecedented in Poland. In order to effectively implement ML solutions and automate existing processes, we need the support of inquisitive, experienced, and data-driven individuals. The ones willing to be up to date on newest algorithms and advancements in AI, from new deep learning architectures, explainable AI and GenAI but still grounded and aware of statistics and predictive modelling. In Allegro you will work with solutions from prototypes to create stable, high-performance solutions and combine these services with batch and stream processing analyzing real BigData (also in the public cloud). What will your job involve? Co-creating projects on each stage - from concept to productization - to deliver insights and models solving business problems from different areas Using a wide range of model types, including boosting models, Bayesian methods, causal inference, optimization methods, deep learning and Generative AI solutions including LLMs and Agentic AI Working hand-in-hand with our Data Engineers who support the heavy-lifting of data processing on GCP Working not only with tabular data, but also with spatial data, natural language texts, images and time series Taking part in implementations of off-line and on-line models Brainstorm, provide mentorship, share knowledge Cooperation with other teams: business stake-holders, analytics, data engineers Why should you work with us? Data Science plays a key role in the operation of Allegro - we are a data-driven technology company, and through the models and analyses provided you will have a significant impact on one of the largest eCommerce platforms in the world You will have a possibility of developing AI tools from prototypes to large production solutions that will have real impact on our users, merchants and employees. Thanks to the wide range of projects we carry out, you will never run out of interesting challenges Support of experienced Data Scientists - there is always someone to exchange ideas with, because we have the best specialists and experts in their field on board You will have access to huge data sets and the latest data processing technologies You will have the opportunity to learn the tools and technologies in practice: Python (including various ML libraries), GCP environment (BigQuery, VertexAI, Cloud Composer, Dataflow), Airflow, PySpark, Gemini/GPT models You will learn good programming, engineering and code management practices We share our knowledge at industry conferences and trainings, we are an active participant and co-creator of the Data Science / Machine Learning community in Poland and in the world Our offer is addressed to people who: Have experience in data analysis using SQL and building machine learning solutions in production environments, especially with end-to-end experience in designing ML models Want to translate business challenges into ML problems Can clearly communicate with business units - from formulating an analytical problem to a clear and intuitive presentation of results Have experience with ML and AI (especially LLMs) Are highly independent, showing strong work organization and taking full responsibility for their given projects Program in Python and efficiently use basic development tools Understand statistical and machine learning methods Embrace modern tooling, specifically possessing practical and theoretical knowledge of Generative AI and Agentic AI principles (coding tools, prompting, validation). The ideal candidate enthusiastically leverages GenAI coding tools (like Copilot) to boost and automate workflows,  remaining up-to-date and critically engaged with the newest GenAI tooling. Speak English and Polish at a B2+ level or higher Graduated with a degree strongly related to statistical/mathematical modeling, such as Mathematics, Physics, Economics, Computer Science (or similar major) or have job experience in data science / ML positions What's in it for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. Annual bonus based on your annual performance and company results. Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale, which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

Technology

Writer

Staff AI research scientist

Senior

Hybrid

Seattle, WA , +2

234,300 - 296,004 USD/yr

🏢 Summary: Staff AI Research Scientist role focused on advancing and deploying large language models and agentic systems for enterprise-scale AI applications. The position involves leading high-impact research across post-training, multi-step reasoning, planning, and alignment, with direct influence on production systems used by major enterprises. This hybrid role offers the opportunity to publish cutting-edge research while shipping innovations into real-world products. 🗂️ Requirements: 7+ years ML research experience, Expertise in large language model pre-training and post-training, Experience training and debugging distributed models at scale, Expert knowledge of SFT, RLHF, RLAIF, DPO, GRPO, Strong proficiency in Python, Strong proficiency in PyTorch or JAX, Experience building scalable training and evaluation pipelines, Proven publication record at top-tier ML/AI conferences, Hands-on experience with agentic systems and multi-step reasoning models, PhD in Computer Science, Machine Learning, NLP or related field (or equivalent research experience) 📃 Skills: Python, PyTorch, JAX, LLMs, SFT, RLHF, RLAIF, DPO, GRPO, NLP, DistributedTraining, DataSynthesis, ModelEvaluation, Alignment, AgenticSystems 🏢 Description: About the role AI research at WRITER isn't just about publishing papers — it's about building the scientific foundation that powers ambitious enterprise AI deployments. As a Staff AI Research Scientist, you'll drive a high-impact research agenda focused on large language models, agentic reasoning, and system-level capabilities that make AI useful at enterprise scale. Your work will advance the field while shipping directly into products used by hundreds of thousands of people. You will work on post-training, planning, multi-step reasoning, and agentic workflows that shape how enterprise AI behaves, performs, and scales. The role is hybrid, based in San Francisco or New York City, reporting to the VP of AI Research. What you'll do - Lead an independent, high-impact research agenda on large language models and agentic systems, owning projects from hypothesis through training, evaluation, and production deployment - Design and execute large-scale post-training experiments using supervised fine-tuning, reinforcement learning from human feedback (RLHF), RLAIF, DPO, and emerging alignment techniques - Improve multi-step reasoning, planning, and tool use in enterprise agentic workflows - Build novel evaluation benchmarks and methodologies for complex enterprise tasks - Develop scalable data synthesis and curation pipelines, including LLM-as-judge frameworks, synthetic data generation, and adversarial dataset construction - Translate research insights into improvements to enterprise-grade LLMs in collaboration with research engineering and product teams - Publish and present original research at top-tier venues such as NeurIPS, ICLR, ICML, and ACL - Mentor researchers and engineers, maintaining high standards for scientific rigor and experimental design What you need - 7+ years of hands-on ML research experience - Deep expertise in large language model pre-training and post-training - Experience training models at scale and debugging distributed jobs - Expert knowledge of SFT, RLHF, RLAIF, DPO, GRPO, and related alignment techniques - Strong command of Python and PyTorch (or JAX) - Experience building scalable training pipelines, evaluation infrastructure, and data synthesis workflows - Publication record at top-tier ML/AI conferences (NeurIPS, ICLR, ICML, ACL, EMNLP or equivalent) - Hands-on experience designing or evaluating agentic systems with multi-step reasoning and tool use - PhD in Computer Science, Machine Learning, NLP, or related field, or equivalent research experience Benefits & perks (US Full-time employees) - Generous PTO and company holidays - Medical, dental, and vision coverage - Paid parental leave (16 weeks) - Fertility and family planning support - Early-detection cancer testing through Galleri - Flexible spending accounts and health savings account with company contribution - Annual wellness and learning stipends - Company-wide and team off-sites - Competitive compensation, stock options, and 401k Compensation Range: $234.3K - $296K

Technology

N-iX

Senior Data Scientist (AI Engineering Focus)

Senior

Remote

Kraków, Poland

41 - 45 USD

🏢 Summary: Senior Data Scientist / AI Engineer role focused on designing and deploying production-ready AI solutions for the insurance industry. The position involves building Agentic AI systems, LLM and RAG-based applications, and Computer Vision solutions from architecture through production deployment. The offer includes flexible work formats, professional development opportunities, and competitive compensation. 🗂️ Requirements: 5+ years of commercial experience as Data Scientist or AI Engineer, Strong Python development skills, Hands-on experience with Machine Learning, Hands-on experience with Deep Learning, Hands-on experience with Generative AI, Experience with LLMs, Experience with RAG architectures, Experience with AI Agent frameworks, Experience building production AI systems, Solid software engineering background, Experience with data analysis and AI product development, Degree in Computer Science, Data Science, Mathematics, Physics, Engineering or equivalent technical background, Upper-intermediate English level, Ability to design scalable AI solutions 📃 Skills: Python, MachineLearning, DeepLearning, GenerativeAI, LLMs, RAG, ComputerVision, AgenticAI, MultiAgentSystems 🏢 Description: (#5468) N-iX  is looking for an experienced Senior Data Scientist with a strong focus on AI Engineering. The role involves designing and delivering production-ready AI solutions for the insurance industry, with a particular emphasis on Agentic AI, LLMs, RAG pipelines, and Computer Vision. Key Responsibilities: Design and develop autonomous AI agent systems for the insurance domain Build production-ready AI solutions using: Multi-Agent Systems Large Language Models (LLMs) Retrieval-Augmented Generation (RAG) Computer Vision Research, evaluate, and implement state-of-the-art AI technologies Develop scalable AI products for international markets Collaborate with a team of Data Scientists and AI Engineers Take AI solutions from architecture and proof of concept through production deployment Participate in building proprietary AI models for the insurance industry Required Skills: 5+ years of commercial experience as a Data Scientist / AI Engineer Strong Python development skills Hands-on experience with: Machine Learning Deep Learning Generative AI LLMs RAG architectures AI Agent frameworks Experience building production AI systems Solid software engineering background Experience with data analysis and AI product development Degree in Computer Science/Data Science/Mathematics/Physics/Engineering or equivalent technical background Upper-intermediate+ English level Strong analytical thinking, proactive mindset Ability to design scalable AI solutions Ability to explain complex technical concepts Independent and structured way of working Team player Nice to Have: Experience within the insurance industry German or Spanish language skills We offer: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits

Technology

Datadog

Staff Software Engineer - ML Observability

Senior

On-site

Boston, MA , +1

19,500 - 25,000 USD/yr

🏢 Summary: Staff Engineer role focused on designing and building advanced LLM observability features to monitor, evaluate, and debug generative AI systems in production. The position involves leading architecture decisions, prototyping and scaling new capabilities, and improving reliability and performance of LLM-based applications. You will work on scalable backend systems that enable tracing, drift detection, and evaluation of AI workloads. 🗂️ Requirements: BS/MS/PhD in Computer Science, Engineering or related field or equivalent experience, Deep understanding of distributed systems, Experience with scalable backend architectures, Hands-on experience building and shipping LLM or GenAI applications, Understanding of model internals and inference pipelines, Knowledge of LLM evaluation techniques, Experience with prompt engineering, Experience with observability tools or platforms 📃 Skills: LLM, GenerativeAI, DistributedSystems, Backend, Observability, Tracing, DriftDetection, ModelEvaluation, Inference, PromptEngineering, Scalability, Architecture 🏢 Description: The ML Observability team builds cutting-edge tools to monitor, explain, and improve AI systems in production, particularly those leveraging Large Language Models (LLMs) and generative AI. We provide robust, scalable observability for AI workloads, including drift detection and model evaluation, and behavior tracing, enabling customers to ship AI with confidence. As a Staff Engineer, you’ll lead the development of new features and foundational capabilities within Datadog’s LLM Observability product. You will shape product direction, drive experimentation, and apply your deep understanding of both AI systems and software engineering to solve open-ended problems in the fast-moving AI landscape. Your work will directly impact how our customers monitor, troubleshoot, and optimize LLM-based applications in production. Join us in building the foundational tools that make AI systems observable, understandable, and reliable in the real world. At Datadog, we place value in our office culture - the relationships and collaboration it builds and the creativity it brings to the table. We operate as a hybrid workplace to ensure our Datadogs can create a work-life harmony that best fits them. What You’ll Do: Drive design and implementation of LLM observability features. Ideate, prototype, and scale new product features to provide insights and drive improvements for generative AI systems Work cross-functionally with other eng teams, product, UX, and applied science to iterate fast and find product-market fit Develop and extend tools for tracing, evaluating, and debugging LLMs Influence architecture decisions and mentor engineers to build resilient, high-performance systems Stay close to customer pain points and use those insights to guide product and engineering priorities Stay current with industry trends and advancements in machine learning and observability, driving innovation within the team Who You Are: You have a BS/MS/PhD in a Computer Science, Engineering or related scientific field or equivalent experience Deep understanding of distributed systems and scalable backend architectures Hands-on experience building and shipping LLM-powered or GenAI applications. Understanding of model internals, inference pipelines, evaluation techniques, and prompt engineering Ability to thrive in ambiguous, fast-changing spaces and have a product-oriented mindset You’re excited to shape the next generation of AI observability tools from the ground up Communicate clearly, think rigorously, and take pride in clean, maintainable code Experience with observability tools/platforms Datadog values people from all walks of life. We understand not everyone will meet all the above qualifications on day one. That's okay. If you’re passionate about technology and want to grow your skills, we encourage you to apply. Benefits and Growth: Get to build tools for software engineers, just like yourself. And use the tools we build to accelerate our development. Have a lot of influence on product direction and impact on the business . Work with skilled, knowledgeable, and kind teammates who are happy to teach and learn Competitive global benefits Continuous professional development Benefits and Growth listed above may vary based on the country of your employment and the nature of your employment with Datadog. #LI-HybridDatadog offers a competitive salary and equity package, and may include variable compensation. Actual compensation is based on factors such as the candidate's skills, qualifications, and experience. In addition, Datadog offers a wide range of best in class, comprehensive and inclusive employee benefits for this role including healthcare, dental, parental planning, and mental health benefits, a 401(k) plan and match, paid time off, fitness reimbursements, and a discounted employee stock purchase plan.The reasonably estimated yearly salary for this role at Datadog is:$234,000—$300,000 USD About Datadog: Datadog (NASDAQ: DDOG) is a global SaaS business, delivering a rare combination of growth and profitability. We are on a mission to break down silos and solve complexity in the cloud age by enabling digital transformation, cloud migration, and infrastructure monitoring of our customers’ entire technology stacks. Built by engineers, for engineers, Datadog is used by organizations of all sizes across a wide range of industries. Together, we champion professional development, diversity of thought, innovation, and work excellence to empower continuous growth. Join the pack and become part of a collaborative, pragmatic, and thoughtful people-first community where we solve tough problems, take smart risks, and celebrate one another. Learn more about #DatadogLife on Instagram, LinkedIn, and Datadog Learning Center. Equal Opportunity at Datadog: Datadog is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and other characteristics protected by law. We also consider qualified applicants regardless of criminal histories, consistent with legal requirements. Here are our Candidate Legal Notices for your reference. Datadog endeavors to make our Careers Page accessible to all users. If you would like to contact us regarding the accessibility of our website or need assistance completing the application process, please complete this form. This form is for accommodation requests only and cannot be used to inquire about the status of applications. Privacy and AI Guidelines: Any information you submit to Datadog as part of your application will be processed in accordance with Datadog’s Applicant and Candidate Privacy Notice. For information on our AI policy, please visit Interviewing at Datadog AI Guidelines.