upwork

Senior Lead Research Scientist, Agentic AI

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Senior Lead Machine Learning Engineer, Agentic AI

Senior Machine Learning Engineer

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Upwork is seeking a Senior Lead Research Scientist specializing in Agentic AI to drive the development and productionization of autonomous, tool-using AI. This role involves a 50/50 split between novel research, including advancing agentic benchmarking and exploring RLEF, and building robust tools and systems for rigorous experimentation and deployment. The scientist will collaborate with ML engineers, product, platform, and safety teams to translate research into scalable AI capabilities for Upwork's customers and developers, contributing to the company's mission to transform workforces with AI.

VP, Head of Analytics, Data Science & Pricing

Upwork Inc.’s (Nasdaq: UPWK) family of companies connects businesses with global, AI-enabled talent across every contingent work type including freelance, fractional, and payrolled. This portfolio includes the Upwork Marketplace, which connects businesses with on-demand access to highly skilled talent across the globe, and Lifted, which provides a purpose-built solution for enterprise organizations to source, contract, manage, and pay talent across the full spectrum of contingent work. From Fortune 100 enterprises to entrepreneurs, businesses rely on Upwork Inc. to find and hire expert talent, leverage AI-powered work solutions, and drive business transformation. With access to professionals spanning more than 10,000 skills across AI & machine learning, software development, sales & marketing, customer support, finance & accounting, and more, the Upwork family of companies enables businesses of all sizes to scale, innovate, and transform their workforces for the age of AI and beyond.Since its founding, Upwork Inc. has facilitated more than $30 billion in total transactions and services as it fulfills its purpose to create opportunity in every era of work. Learn more about the Upwork Marketplace at Upwork.com---We’re seeking a Senior Lead Research Scientist (Agentic AI) to push the frontier of autonomous, tool‑using AI and ensure that innovations make it into production. You’ll split your time between novel research (benchmarks, learning algorithms, publications, and thought leadership) and building the tools, datasets, and systems required to run rigorous experiments and ship results into our agentic platform. You will partner closely with ML engineers, product, platform, and safety teams to translate research into reliable, scalable capabilities for customers and developers on Upwork.<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Responsibilities</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">50/50 Split between research and engineering/productionalization.</li><li class="leading-relaxed">Advance agentic benchmarking. Define and maintain a rigorous evaluation suite for agents (task success, reliability, recovery, safety, latency, and cost). Establish protocols, datasets, and reproducible metrics aligned to best practices in agentic evaluation; continuously harden benchmarks against loopholes and overfitting.</li><li class="leading-relaxed">Invent and publish. Lead novel studies on agent planning, tool use, reflection/memory, safety, and multi‑agent coordination. Publish at top venues (e.g., NeurIPS/ICML/ICLR/ACL) and present learnings internally and externally.</li><li class="leading-relaxed">Explore RLEF for agents. Develop Reinforcement Learning from Execution Feedback (RLEF) approaches that ground agent behavior in environment/run‑time signals (e.g., execution traces, tool results, test outcomes), comparing to RLHF/RLAIF on agent tasks.</li><li class="leading-relaxed">Continuous/online learning. Design safe, measurable loops for continual improvement (data selection, drift detection, reward model updates, policy refresh), with guardrails that protect quality and cost.</li><li class="leading-relaxed">Human‑in‑the‑loop systems. Partner on data strategy, labeling protocols, and reviewer tooling for RLHF and workflow‑level judgment; instrument quality controls and reviewer calibration.</li><li class="leading-relaxed">Build research tooling. Stand up agents‑at‑scale experiment infrastructure: simulators, sandboxes, and orchestration for long‑horizon tasks; evaluation harnesses; offline/online A/B; and dashboards for longitudinal tracking.</li><li class="leading-relaxed">Train & align models. Implement high‑quality pipelines for SFT, DPO, RLHF/RLAIF/RLEF; manage data provenance, safety filters, and automated red‑teaming; integrate eval signals into CI/CD.</li><li class="leading-relaxed">Ship to production. Collaborate with platform teams to graduate prototypes into reliable services (APIs/SDKs, auth, observability, rate limiting) and to integrate agents with developer protocols (e.g., MCP) and runtime services.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">What it takes to catch our eye</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">PhD or equivalent research track record with peer‑reviewed publications in relevant venues; strong empirical methodology and scientific writing/presentation skills.</li><li class="leading-relaxed">Demonstrated contributions to agentic evaluation/benchmarks or long‑horizon reasoning (e.g., designing tasks, metrics, robust protocols).</li><li class="leading-relaxed">Hands‑on experience adapting LLMs for tool use and multi‑step plans; fluent in prompting, function/tool calling, and memory/critique patterns.</li><li class="leading-relaxed">Practical mastery of alignment methods (SFT, DPO, RLHF, RLAIF, and RLEF) and reward‑modeling; you know when to prefer each and how to evaluate them.</li><li class="leading-relaxed">Proficiency in Python and one or more of PyTorch/JAX; experience with distributed training (e.g., DDP/Ray), dataset curation, experiment tracking, and reproducibility.</li><li class="leading-relaxed">Ability to build research‑grade tools that evolve into production‑grade services (APIs/SDKs, data stores, streaming/messaging, tracing/metrics).</li><li class="leading-relaxed">Comfortable building end‑to‑end eval pipelines (offline + online), defining pass/fail gates, and quantifying trade‑offs (quality, safety, latency, cost).</li><li class="leading-relaxed">Experience with safety testing and red‑teaming for agents; familiarity with risk taxonomies for autonomous systems.</li><li class="leading-relaxed">Proven success mentoring senior ICs, leading cross‑functional initiatives, and educating internal/external audiences (talks, tutorials, blog posts, open‑source).</li></ul>---Come change how the world works.Upwork is establishing its first international operational hub in Lisbon, Portugal. The new office is expected to be fully operational by Q4 2026.This position will initially be employed through a partner to ensure a seamless hiring process while we establish the hub. Once the hub is established, there may be opportunities to transition to employment with Upwork depending on business needs and other requirements. While employed by the partner, you’ll work as part of Upwork’s team, with access to our resources, culture, and growth opportunities.Our partner will offer competitive benefits. When Upwork’s hub is established, we will be excited to offer employment and benefits directly as business needs require.Upwork is committed to building a diverse, inclusive, and equitable workforce. Employment decisions are made without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, or any other status protected by applicable law.To learn more about how Upwork processes and protects your personal information as part of the application process, please review our Global Job Applicant Privacy NoticeCreate a Job AlertInterested in building your career at Upwork? Get future opportunities sent straight to your email.Create alertApply for this job<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">indicates a required field</li></ul>Autofill with MyGreenhouseFirst Name*Last Name*Email*PhoneCountryPhoneLocation (City)*Locate meResume/CVAttachAttachDropboxGoogle DriveEnter manuallyEnter manuallyAccepted file types: pdf, doc, docx, txt, rtf---LinkedIn Profile, Portfolio, Website, OtherSubmit application

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- This assessment gives us an idea of your C++ skills - Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc. - 10 Multiple Choice questions - Average time to complete: 7 to 10 minutes

Let's assess your Data Structures! 📋 &nbsp;- This assessment gives us an idea of your problem solving skills using DSA - Companies that evaluate this skillset in interviews: MPL, LILA Games, GSN Games, etc. - 10 Multiple Choice questions - Average time to complete: 7 to 10 minutes

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CD PROJEKT RED

Lead UI Engineer

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CONNECTIVITY SOFTWARE ENGINEER

Business Analyst Intern - Summer 2026

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CD PROJEKT RED is seeking a Lead UI Engineer for the Cyberpunk 2 Team. This role involves leading the UI Engineering Team to implement and maintain user interface features for the game. Key responsibilities include managing direct reports, fostering their professional growth, collaborating with designers and artists, developing and enhancing UI features, optimizing existing systems, creating new UI framework features, building tools for UI artists and designers, and resolving bugs while ensuring high-quality code delivery.

Product Data Analyst

Enterprise Architect

Expert Technical Artist

FP&A Specialist

Cinematic Animation Lead

Senior VFX Artist

Senior Audio Programmer

Lead Concept Artist

Developer Support Specialist (DevOps)

<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Company Description</h2>To create revolutionary, story-driven RPGs which go straight to the hearts of gamers — this is our mission. Want to dive deeper into our company’s culture? Explore our social media and check out our <a href="https://www.youtube.com/CDPRED" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">YouTube channel</a> and <a href="https://www.cdprojektred.com/en/blog" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">Beyond the Game Blog</a> where we share behind-the-scenes insights and stories direct from our team members!<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Job Description</h2>CD PROJEKT RED is looking for a Lead UI Engineer to join Cyberpunk 2 Team. In this role, you will lead the UI Engineering Team responsible for implementing and maintaining user interface features for the game.Daily Responsibilities:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Managing your direct reports and supporting their professional development and career path, including setting up 1:1s, performance management, hiring and promotions.</li><li class="leading-relaxed">Working closely with designers, artists and other developers to understand their needs and ensure that your team is aligned with everyone to deliver on expectations.</li><li class="leading-relaxed">Guiding your team to build and enhance UI features.</li><li class="leading-relaxed">Maintaining and optimizing existing systems.</li><li class="leading-relaxed">Creating new features for the user interface framework.</li><li class="leading-relaxed">Implementing tools for UI artists and designers.</li><li class="leading-relaxed">Tracking and fixing bugs in the game user interface and user interface framework.</li><li class="leading-relaxed">Managing and completing tasks effectively and on time, while creating high quality code.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Qualifications</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">At least 7 years of professional experience as a UI programmer/engineer within the games industry.</li><li class="leading-relaxed">3+ years of management experience.</li><li class="leading-relaxed">Understanding the elements and player experience of successful user interfaces in modern video games.</li><li class="leading-relaxed">Ability to build a user interface in a way that is accessible to everyone.</li><li class="leading-relaxed">Strong proficiency in C++ programming and knowledge of Unreal Engine.</li><li class="leading-relaxed">Proficiency in algorithms and code architecture.</li><li class="leading-relaxed">Debugging and optimization skills.</li><li class="leading-relaxed">Strong attention to detail and quality.</li><li class="leading-relaxed">Ability to work effectively in a team and independently when required.</li><li class="leading-relaxed">Ability to communicate clearly, effectively and respectfully in a multicultural and multilingual environment across time zones is essential.</li></ul>**Nice to have:(Please note that these skills are not required to apply for the position)**<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Experience with Diegetic/In-world UI.</li><li class="leading-relaxed">Experience working with Common UI in Unreal.</li><li class="leading-relaxed">Experience with multiplayer UI.</li><li class="leading-relaxed">Experience with Unreal UI MVVM.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Additional Information</h2>The application window for this position will close by 05/31/2026.This job can be hybrid/in-office or fully remote.Remote roles in the US are only available to candidates that reside in the following states: California, Colorado, Connecticut, Florida, Illinois, Kentucky, Maryland, Massachusetts, Minnesota, Nevada, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, Rhode Island, Tennessee, Texas, Washington, Wisconsin.Health & Well-Being<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Company-paid medical healthcare (dental, vision, and mental).</li><li class="leading-relaxed">Free mental health support, including access to counseling, psychiatric care, and a variety of well-being webinars.</li><li class="leading-relaxed">Paid leave — 20 days of holiday per year (26 days after two years).</li><li class="leading-relaxed">401K with employer matching.</li><li class="leading-relaxed">Gym Membership Reimbursement.</li><li class="leading-relaxed">Menstrual leave — employees who menstruate can take one extra day off when experiencing period pain.</li><li class="leading-relaxed">RED Parents Network — support for working parents, including childcare benefits, and family-friendly events.</li></ul>Perks & Professional Growth<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Flexible working hours.</li><li class="leading-relaxed">Trainings, lectures, and courses — internal workshops, knowledge-sharing initiatives, online tutorials, and e-learning classes are all available.</li><li class="leading-relaxed">A welcome pack filled with goodies — to help you feel right at home once you join the team.</li></ul>Life in the Office<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Dog-friendly office — bring your pooch with you and look after them while working! There’s always a furry friend or two to meet.</li><li class="leading-relaxed">Truly international working environment — a chance to meet and work with a diverse selection of people from all around the world.</li><li class="leading-relaxed">No dress-code — we like to keep it casual.</li></ul>This position is a new role.Estimated pay range for this position: $180,100 - $247,600 _CAD annuallyThis role may also be eligible for discretionary stock options._At CD PROJEKT RED compensation for our roles in North America are determined based on competitive market data, geographic location, and individual factors tied to business needs. The base pay range is subject to change and may be modified in the future. Final offers are dependent on job-related factors like experience, qualifications, and location.If you've observed any irregularities (i.e. legal or ethical violations) in our recruitment process, please click <a href="https://www.cdprojekt.com/en/esg/share-your-opinion/" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">here</a> to report them anonymously._#LI_Hybrid

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This assessment gives us an idea of your C++ skills- Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc.- 10 Multiple Choice questions- Average time to complete: 7 to 10 minutes

Let's assess your Data Structures! - This assessment gives us an idea of your problem solving skills using DSA- Companies that evaluate this skillset in interviews: MPL, LILA Games, GSN Games, etc.- 10 Multiple Choice questions

Data Structures and Algorithms

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Programming Patterns

Let's assess your OOPs skills! ????- This assessment gives us an idea of your fundamental OOPS concepts and Solid principles skills- Companies that evaluate this skillset in interviews: Hitwicket, GSN Games, Tomo Club, etc.

Object Oriented Programming

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