Senior Staff Machine Learning Engineer, AI Engineering Tools

1 month ago
Full-time
Lead
Software Development
Block

Block

Block is a company that consists of Square, Cash App, Spiral, TIDAL, TBD, and foundational teams. They are focused on economic empowerment by creating tools to expand access to the economy. Square helps sellers run and grow businesses, Cash App redefin...

Capital Markets
10K-50K
Founded 2009

Description

  • Design and build AI-driven developer tools that integrate into the software development lifecycle (e.g., intelligent code assistance, inline reviews, automated refactoring).
  • Build and optimize coding agents and AI infrastructure to support engineers across all Block repositories and workflows.
  • Partner with vendors and internal teams to evaluate, integrate, and optimize third-party and custom AI models and tools.
  • Collaborate with platform, product teams, and engineering leaders to identify opportunities for AI integration that improve developer velocity and code quality.
  • Continuously improve AI agents’ ability to understand context, complete tasks, and assist in real-world development workflows.
  • Contribute to design and code reviews and help establish best practices for building reliable, secure AI systems at scale.
  • Mentor engineers and provide technical leadership across cross-functional teams.
  • Balance experimentation and iteration with reliability and security considerations when developing AI tooling.

Requirements

  • 12+ years of experience building and shipping production systems.
  • Strong software engineering background with fluency in designing scalable backend systems.
  • Deep understanding of large language models (LLMs), prompt engineering, and applied ML workflows from experimentation and evaluation to deployment and monitoring.
  • Experience integrating third-party AI models (e.g., OpenAI, Anthropic) or custom fine-tuned models into production tools or services.
  • Pragmatic approach to experimentation that balances innovation with reliability and security.
  • Strong communication and cross-functional collaboration skills, especially working with engineers, product managers, and leadership.
  • Experience mentoring engineers and participating in design and code reviews.
  • Familiarity with developer ecosystems, IDEs, or productivity platforms is a plus (e.g., VS Code, Cursor, GitHub Copilot).

Benefits

  • Market-based pay; U.S. Zone A–D starting pay range: $276,800—$415,200 USD (final offer varies by location, skills, and experience).
  • Remote work options (remote-friendly environment).
  • Medical insurance and other health benefits.
  • Flexible time off and modern family planning benefits.
  • Retirement savings plans.
  • Inclusive workplace practices, reasonable accommodations during hiring, and consideration under “fair chance” hiring policies.

Interested in this position?

Apply directly on the company website

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