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Weights & Biases

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

Weights & Biases · Livingston, NJ / New York, NY / San Francisco, CA / Sunnyvale, CA / Bellevue, WA

Posted about 3 months ago · $182,000 to $242,000

or apply directly on Weights & Biases's site. We never take the application ourselves.

Is this posting real?

This role has been open
80 days
Weights & Biases's roles stay open a median of 81 days
Reposted
No
Salary listed
Yes
86% of Weights & Biases's roles list one
Ghost-job risk at Weights & Biases
high
14 stale, 0 reposted of 14 open
Hiring momentum
17 roles opened in the last 90 days
↑ up vs. the prior 90 days
Last confirmed on the employer's board
2026-10-23

Measured from postings appearing on and disappearing from Weights & Biases's own greenhouse board since 2026-08-03. Full hiring picture for Weights & Biases.

About this role

As a Senior Full Stack Engineer on the ARIA Agent team, you will be responsible for developing and maintaining features across the entire stack, including backend infrastructure and a React frontend. Your work will involve building distributed systems for agent conversations, designing real-time streaming architectures, and collaborating with various teams to enhance the user experience. Daily tasks will include debugging production issues, shipping new UI components, and ensuring the reliability of the systems you develop.

Our read on this posting4.0out of 5
benefits
5/5
freshness
1/5
career value
4/5
role clarity
5/5
pay transparency
5/5

Scored from the posting itself — how clearly the role is described, how much it says about pay and benefits, and how recently it was listed. Not a judgement of Weights & Biases as an employer.

What you need

  • Bachelor’s degree or foreign equivalent in Computer Science, Computer Engineering, Data Science, Information Systems, or a closely related technical or quantitative field involving substantial coursework in Engineering
  • 4+ years of full stack engineering experience, with meaningful depth in both backend services and React/TypeScript frontend development
  • Strong Python backend skills — async patterns, FastAPI, distributed state machines, Kubernetes pod lifecycle
  • Proficient in TypeScript and React; comfortable building and maintaining production UI components including real-time streaming interfaces, complex state management, and responsive layouts across web and mobile web
  • Experience building and operating services at scale — rolling deploys, autoscaling, worker concurrency, graceful termination
  • Experience with observability tooling (Datadog, Weave tracing, structured logging) and a track record of building dashboards that surface actionable signals

Nice to have

  • Experience building streaming UIs (server-sent events, WebSockets) with graceful fallback handling
  • Background in ML infrastructure, developer tooling, or observability platforms
  • Hands-on experience building and shipping production-grade AI agents — including tool use, multi-turn conversation management, and agentic reliability patterns
  • 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

What you get

  • Medical, dental, and vision insurance - 100% paid for by CoreWeave
  • Company-paid Life Insurance
  • Voluntary supplemental life insurance
  • Short and long-term disability insurance
  • Flexible Spending Account
  • Health Savings Account

Worth weighing

  • No specific mention of the tech stack beyond Python, React, and TypeScript
  • Role involves both backend and frontend work, which may require a broad skill set
  • Fast-paced startup environment may lead to rapid changes in priorities and responsibilities

Summarised from Weights & Biases's posting. Read the full original.

Listed by Weights & Biases on their greenhouse job board, last confirmed open on 2026-10-23. PitchMeAI is not the employer.

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