Senior Founding Engineer

About this role

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! 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.