Job Description
Senior Software Engineer — AI Platform Custom AI Solutions | Remote (Brazil) | Contract Engagement About the Role We are looking for a Senior Software Engineer to engage directly with our CTO and engineering leadership as a dedicated platform engineer on VoxaCor™ and BridgeNode™. This is not a staff augmentation role — you will have real ownership across architecture decisions, feature development, and platform reliability. VoxaCor™ is our AI voice and SMS platform built for high-volume, real-time communication. BridgeNode™ is the open-source AI conversation framework that powers it — every product CAIS builds runs on it. You will own significant surface area across both — from AI agent orchestration and real-time voice pipelines to frontend interfaces and infrastructure. AI-first development is core to how we build — if you haven't shipped production AI systems, this role isn't for you. This is a contract engagement. Applicants must have a registered legal entity in Brazil to contract through. This is a firm requirement and is not negotiable. Key Responsibilities Build and maintain real-time AI voice pipeline components: STT, TTS, LLM orchestration, and telephony integration Develop multi-tenant SaaS platform features across web, voice, and SMS channels Implement AI agent workflows using Mastra orchestration and Anthropic/Gemini LLM integrations Design and build backend services, APIs, and data models supporting high-volume production workloads Develop frontend interfaces and progressive web app (PWA) features in React Build platform tooling, admin interfaces, and partner-facing configuration systems Contribute to BridgeNode™ open-source framework and VoxaCor™ proprietary feature layers Tech Stack Backend: Node.js, TypeScript, PostgreSQL, Docker Frontend: React 19, TypeScript, Tailwind CSS, shadcn/ui, PWA Voice & Telephony: Telnyx, Deepgram (STT/TTS), WebRTC, SIP AI / LLM: Anthropic Claude, Google Gemini, Mastra orchestration Infrastructure: Azure, GitHub Actions C
