Senior Software Engineer - AI First, Full Stack

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 CI/CD, multi-tenant architecture

Compensation

• Structure: Paid twice monthly in USD for work performed

• On-Target Earnings: $44K–$66K USD - depending on experience

Qualifications

• 5+ years of full-stack engineering experience with TypeScript/Node.js and React

• Production experience building and shipping AI-powered applications — not just prototypes

• Hands-on experience with LLM APIs (Anthropic, OpenAI, Gemini, or equivalent) and agent orchestration

• Real-time systems experience: WebSockets, streaming APIs, or telephony/voice pipelines

• Strong database and API design fundamentals with PostgreSQL

• Comfortable working in a multi-tenant SaaS architecture

• Professional English proficiency — written and verbal communication must be clear, accurate, and effective for async collaboration with a US-based team

• Able to work independently, manage your own priorities, and communicate proactively in English

• Available to overlap with US Mountain/Pacific business hours for team collaboration

• Registered legal entity in Brazil — required for contract engagement (not negotiable)

Strong Pluses

• Experience deploying or self-hosting open-source LLMs in private or air-gapped infrastructure environments

• Prior work in voice AI, telephony platforms, or real-time audio pipelines

• Open-source contributions, particularly to frameworks or developer tooling

• Experience with Mastra, Pipecat, or similar AI agent orchestration frameworks

• Background in transportation, logistics, or dispatch software ecosystems

What We're Looking For The ideal candidate is an experienced, self-directed engineer who defaults to building. You don't need hand-holding — you read the requirements, ask the right questions, and ship. You're excited about AI not as a buzzword but because you've worked in the stack and understand what it takes to run these systems in production. You want a role where your work matters and your decisions have real impact.

Not a Fit If

• You don't have direct experience shipping AI systems to production

• You're looking for a short-term engagement

• You don't have a registered Brazilian entity to contract through

• You need heavy management oversight to stay productive

• Your English is not sufficient for async written collaboration

Originally posted on Himalayas