Machine Learning Engineer

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.

Block is organized into business groups, each with dedicated product and engineering teams. Our team plays a vital role in supporting these groups by delivering AI-powered solutions that directly benefit our customers and drive business growth. We focus on the customer support space, where we build AI systems that make support experiences faster, more reliable, and more human-centered. The tools we create help automate support workflows, augment advocates with intelligent assistance, and ultimately improve the way millions of customers get help.

We are looking for an enthusiastic and experienced Machine Learning Engineer to join our team to build AI products. In this role, you will collaborate closely with teams across Block to understand their challenges and opportunities. You'll have the opportunity to work across the full development stack and set product strategy. You'll design, develop, and launch AI-driven tools and applications that address real customer needs, working in an environment that values creativity, experimentation, and practical problem solving.

You will partner with stakeholders to deliver highly visible solutions, staying at the forefront of AI advancements to ensure our products remain innovative and effective. We welcome individuals who are passionate about building for the real world, embracing pragmatic approaches, and seeing challenges from fresh, nontraditional viewpoints.

• Leverage AI to automate workflows and deliver new AI-powered product experiences
• Develop scalable AI systems and platforms
• Collaborate across diverse teams to develop AI solutions by understanding and generalizing the problems of cross-functional stakeholders
• Drive architectural decisions, system reliability improvements, and infrastructure automation
• Mentor and guide other engineers
• Champion engineering excellence through code reviews, technical documentation, and continuous improvement

• 5+ years of experience in training and deploying ML models, developing ML software, and shipping customer-facing ML products.
• Deep understanding of modern ML techniques including Large Language Model Agents and the ML lifecycle: from data collection and training to evaluation, prompting, context management, reasoning, safety evaluation and benchmarking, and deploying models into production.
• A desire to understand our clients' needs in order to design tools and systems that solve our customer's problems. As a platform team, our main customers are internal developers and products.
• Ability to produce production-quality code and services incorporating testing, evaluation, monitoring as well as the ability to quickly adapt to a new domain, hack MVP's, and iterate to improve product.
• Strong communication skills (verbal and written) with technical and non-technical stakeholders.

Use of AI in Our Hiring Process

We may use automated AI tools to evaluate job applications for efficiency and consistency. These tools comply with local regulations, including bias audits, and we handle all personal data in accordance with state and local privacy laws.

Contact us at with hiring practice or data usage questions.

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.

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.