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 architectures that deliver 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 architectures for delivering real-time token output to the browser.
• Contribute to frontend components that enhance the speed and intuitiveness of ARIA.
• Collaborate with ML science, product, iOS, and SRE teams to ensure seamless and reliable system operation.

Requirements

• 4+ years of full stack engineering experience, with meaningful depth in both backend services and React/TypeScript frontend development.
• Strong Python backend skills, including async patterns, FastAPI, distributed state machines, and Kubernetes pod lifecycle.
• Proficient in TypeScript and React; experience with real-time streaming interfaces, complex state management, and responsive layouts.
• Experience building and operating services at scale, including rolling deploys, autoscaling, worker concurrency, and graceful termination.
• Experience with observability tooling (Datadog, Weave tracing, structured logging) and a track record of building dashboards that surface actionable signals.
• Security-conscious engineering mindset, including input validation, sandboxed code execution, egress controls, and payload hardening.
• Experience with MySQL or similar RDBMS for transactional state management.

Qualifications

• Expertise in transforming deep technical insights into tools and processes that empower other engineers to build faster, more reliable systems.
• Background in ML infrastructure, developer tooling, or observability platforms.
• Comfortable thriving in a fast-paced startup environment, able to move quickly, make pragmatic tradeoffs, and iterate on real user feedback without sacrificing production quality.

Skills

• Full stack engineering experience, with strong backend and frontend skills.
• Python backend skills, including async patterns, FastAPI, distributed state machines, and Kubernetes.
• TypeScript and React proficiency, with experience in real-time streaming interfaces, complex state management, and responsive layouts.
• Experience building and operating services at scale, including rolling deploys, autoscaling, worker concurrency, and graceful termination.
• Observability tooling expertise, including Datadog, Weave tracing, and structured logging.
• Security-conscious engineering mindset, including input validation, sandboxed code execution, egress controls, and payload hardening.
• Experience with MySQL or similar RDBMS for transactional state management.

Benefits

• Medical, dental, and vision insurance - 100% paid by CoreWeave.
• 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).