Senior Member of Technical Staff

Bluejay; San Francisco (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Bluejay is seeking a Full Stack engineer in San Francisco with over 6 years of experience. The role involves designing scalable infrastructure for voice AI agents, working closely with some of the largest companies globally. You will be responsible for developing algorithms and systems to ensure reliability and safety in real-time interactions. This position requires proficiency in tools such as React, Python, and AWS. Ideal candidates are passionate about excellence in their craft and have experience in voice AI technologies.

Qualifications

• 6+ years of experience required.
• Experience with voice AI technologies is a plus.
• Familiarity with building at scale across frontend and backend.

Responsibilities

• Architect and develop systems simulating conversational AI agents.
• Design scalable infrastructure on AWS for real-time conversations.
• Develop algorithms to ensure agents are reliable and aligned with human intent.

Skills

React

TypeScript

Python

FastAPI

Tailwind

AWS

Tools

Redis

Websockets

CI/CD

Job description

Bluejay is building the simulation, evaluation, and observability layer for voice + text AI agents. We work with Fortune 500s, multi-national corporations, and startups to make sure their AI agents perform as intended. We raised a 4m seed backed by Floodgate, PeakXV, and YC in June, and have been doubling our growth every 3 months since inception.

We are looking for cracked, FULL STACK, founding engineers with 6+ YOE who would like to join the Bluejay rocketship. We want senior, experienced engineers who get really excited about building cool shit. We hold a high technical bar and expect proficiency across the stack. The scale our customers operate at is ridiculous. We need engineers who are familiar with building at scale, all the way from database optimization to frontend dashboard load speed.

At Bluejay, you’ll be working with some of the largest companies in the world to test, monitor, and improve their Voice AI agents. You’ll be working with tech across the stack, and taking full ownership for your work. We are small team punching well above our weight, and expect you to do so as well!

Do Not Apply If

• You have never taken a hobby to an extreme. For example:
  • Solved rubics cubes, played a sport, etc at a competitive level
  • Spent hours practicing a frame-perfect combo
  • Achieved/Maintained a super high rank in a video game
  • Pushed your physical limits and set a local record in any sport or athletic event

We are looking for people who strive for greatness in every aspect of their life.

Frontend

• React
• Tailwind
• TypeScript
• NextJS

Backend

• Python
• FastAPI
• Supabase
• Redis
• AWS (a lot of it)
• Voice AI: LiveKit, Deepgram, Cartesia, Elevenlabs, Gemini, etc
• Websockets
• CI/CD chops

Desirable Quirks

• super opinionated about random design decisions
• enjoys keeping a clean room (codebase cleanliness)
• physically cringes when seeing inefficient code or poorly designed systems
• has good intuition when designing new systems
• aesthetic, inspired, artsy, in touch

Desirable Experiences (any of these will pique our interest)

• Has worked at a YC company as a founding engineer for over 6 months
• Has worked in the voice AI space
• Has built beautiful frontend websites
• Is a technical, ex-VC-backed founder

What You’ll Do

• Architect and develop systems that simulate, analyze, and evaluate conversational AI agents, including voice and multimodal systems.
• Design resilient, scalable infrastructure using AWS (Lambda, EC2, Websockets, SIP) to handle millions of real-time conversations.
• Develop algorithms and pipelines that surface insights, detect failure modes, and ensure agents are safe, reliable, and aligned with human intent.
• Work on-site with customers. This early on, you’ll be building, selling, and deploying the product to real customers.