Senior Machine Learning Engineer (Modeling), Support

Block is one company built from many blocks, all united by the same purpose of economic empowerment. The blocks that form our foundational teams - People, Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more - provide support and guidance at the corporate level. They work across business groups and around the globe, spanning time zones and disciplines to develop inclusive People policies, forecast finances, give legal counsel, safeguard systems, nurture new initiatives, and more. Every challenge creates possibilities, and we need different perspectives to see them all. Bring yours to Block.
Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We've been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy
Block's Support ML Modeling team is a central driver of innovation in customer support experiences across our entire ecosystem-including Cash App, Square, and other business units. We are dedicated to advancing the state of intelligent, automated support through machine learning and generative AI. From customer-facing chatbots to smart internal tools for agents, our team builds high-impact, scalable systems that improve support quality, efficiency, and accessibility.
We're building the future of support at Block: one powered by AI, voice interfaces, and smart automation. We're looking for candidates with a passion for intelligent systems, practical ML experience, and a desire to build product-driven solutions.
You Will

• Lead R&D efforts to explore and prototype next-generation chatbot architectures using LLMs, retrieval-augmented generation (RAG), fine-tuning, and real-time inference
• Design and deploy ML models powering conversational agents, including the support chatbot used across Cash App, Square, and other Block products
• Build generative AI systems that scale intelligently across multiple business units, adapting to diverse products, users, and use cases
• Advance voice support automation, enabling natural, responsive, and accurate voice-based interactions
• Develop systems to infer customer intent, enabling effective routing, triaging, and resolution of cases with minimal human involvement
• Create ML-powered tooling and real-time recommendation systems to assist support agents and enhance customer outcomes
• Engineer robust, reusable modeling pipelines capable of high throughput, rapid iteration, and easy deployment
• Collaborate cross-functionally with product, engineering, design, and operations teams to ship impactful ML features at scale

You Have

• 6+ years of experience in machine learning, applied AI, or product ML roles
• Demonstrated experience with language models, dialog systems, or generative AI in production
• Strong knowledge of NLP, deep learning, and ML infrastructure best practices
• Experience with speech processing or voice interfaces is a strong plus
• Proven ability to ship end-to-end ML features-framing problems, prototyping, training, evaluation, and deployment
• Experience designing scalable model pipelines and maintaining production ML services
• Excellent communication skills and a collaborative mindset
• Enthusiasm for R&D and pushing the boundaries of what AI can do for support

Technologies We Use and Teach

• Python, PyTorch, TensorFlow, or JAX

We're working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.
We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we're doing to build a workplace that is fair and square? Check out our I+D page .
Block will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and "fair chance" ordinances.
Block takes a market-based approach to pay, and pay may vary depending on your location. U.S. locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate's starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.
To find a location's zone designation, please refer to this resource . If a location of interest is not listed, please speak with a recruiter for additional information.
Zone A: USD $228,700 - USD $343,100
Zone B: USD $217,300 - USD $325,900
Zone C: USD $205,900 - USD $308,900
Zone D: USD $194,500 - USD $291,700
Every benefit we offer is designed with one goal: empowering you to do the best work of your career while building the life you want. Remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning are just some of our offering. Check out our other benefits at Block.
Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people. Square makes commerce and financial services accessible to sellers. Cash App is the easy way to spend, send, and store money. Afterpay is transforming the way customers manage their spending over time. TIDAL is a music platform that empowers artists to thrive as entrepreneurs. Bitkey is a simple self-custody wallet built for bitcoin. Proto is a suite of bitcoin mining products and services. Together, we're helping build a financial system that is open to everyone.