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 of 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.
The Role
At Block, we believe great support is core to great products and AI can make that support faster, more personal, and more human. Our team builds the intelligence behind how millions of customers get help every day. We design and deliver AI systems that automate workflows, empower advocates with intelligent tools, and transform how people experience support across Block's products.
We're looking for a Machine Learning Engineer who loves to build, experiment, and ship. You'll work on AI systems that blend language models, agents, and real-time insights - everything from chatbot automation to advocate assistance tools that help humans do their best work.
You'll explore new AI techniques, prototype ideas, and turn experiments into production systems that make a real impact. You'll collaborate with a team of experienced engineers and cross-functional partners who share a passion for human-centered AI and you'll grow your skills while helping millions of people get the help they need, faster.
You Will

• Apply AI and ML techniques to automate workflows, using AI tools to explore new ideas and accelerate development.
• Contribute to the design and development of scalable ML systems and tools, working with guidance from more senior engineers.
• Work with product, design, and platform teams to turn support requirements and insights into scalable AI solutions.
• Apply curiosity and care when experimenting with AI - balancing innovation with responsibility and respect for the customer experience.
• Prototype and iterate on ideas using modern AI frameworks, including prompt tuning to llm-based workflows.
• Maintain high code quality and documentation, participating in code reviews and technical discussions.

You Have

• 2+ years of experience in (or equivalent) in software or machine learning engineering.
• Familiarity with Large Language Models (LLMs), agents, and the end-to-end ML workflow
• Ability to write clean, maintainable code and integrate with existing systems.
• Experience working in a collaborative environment and contributing to team-level projects.
• Stays current with modern AI engineering practices, continuously learning new frameworks, tools, and coding workflows that use AI to accelerate development and deepen technical insight
• A hands-on, experimental mindset who enjoys testing ideas, exploring options, and learning from what works.

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 a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, without regard to race, color, religion, gender, national origin, age, disability, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class.
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 [email protected] 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. 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.