Senior Software Engineer, W&B Agent - W&B

About the role

The Senior Full Stack Engineer on the ARIA Agent team will own features and systems across the entire stack, from backend infrastructure and API design to the React frontend that powers the chat interface, billing UI, and agent configuration experience. Responsibilities include building and maintaining distributed worker systems that run agent conversations at scale, designing streaming architecture for real-time token output to the browser, and contributing to frontend components that make ARIA feel fast and intuitive. Collaboration with ML science, product, iOS, and SRE teams is key.

Responsibilities

• Build and maintain distributed worker systems for running agent conversations at scale
• Design and implement streaming architecture for delivering real-time token output to the browser
• Contribute to React frontend components that enhance the ARIA agent experience
• Collaborate with ML science, product, iOS, and SRE teams to ensure seamless integration and reliability
• Debug production issues, including memory leaks in Kubernetes workers, and ship new UI components
• Ensure security measures are in place, including input validation, sandboxed code execution, and egress controls
• Work with MySQL or similar RDBMS for transactional state management

Requirements

Strong Python backend skills, proficiency in TypeScript and React, experience with observability tooling, and background in ML infrastructure, developer tooling, or observability platforms are preferred. Experience building and operating services at scale, including rolling deploys, autoscaling, and worker concurrency, is also essential.

Qualifications

• 4+ years of full stack engineering experience, with meaningful depth in both backend services and React/TypeScript frontend development
• Expertise in async patterns, FastAPI, distributed state machines, and Kubernetes pod lifecycle
• Comfortable with real-time streaming interfaces, complex state management, and responsive layouts across web and mobile web
• Experience with MySQL or similar RDBMS for transactional state management
• Background in ML infrastructure, developer tooling, or observability platforms
• Experience building and shipping production-grade AI agents

Skills

• Python backend skills
• TypeScript and React proficiency
• Experience with observability tooling (Datadog, Weave tracing, structured logging)
• Experience with MySQL or similar RDBMS
• Experience with distributed systems and Kubernetes
• Experience with real-time streaming interfaces and complex state management
• Experience with production-grade AI agent development

Benefits

• Medical, dental, and vision insurance
• Company-paid Life Insurance
• Voluntary supplemental life insurance
• Short and long-term disability insurance
• Flexible Spending Account (FSA)
• Health Savings Account (HSA)
• Tuition Reimbursement
• Ability to participate in Employee Stock Purchase Program (ESPP)
• Mental Wellness Benefits through Spring Health
• Family-Forming support provided by Carrot
• Paid Parental Leave
• Flexible, full-service childcare support with Kinside
• 401(k) with a generous employer match
• Catered lunch each day in our office and data center locations
• A casual work environment
• A work culture focused on innovative disruption

Pay

The base salary range for this role is $182,000 to $242,000. The starting salary will be determined based on job-related knowledge, skills, experience, and market location.

Schedule

We strive for both market alignment and internal equity when determining compensation. In addition to base salary, our total rewards package includes a discretionary bonus, equity awards, and a comprehensive benefits program (all based on eligibility).