Our client is building a conversational AI platform that automates phone calls, campaigns, and real-time call analytics.
They are looking for a Senior Backend Developer or backend-focused Full-Stack Developer to build integrations with third-party APIs and support the continued development of their multi-tenant SaaS platform.
Responsibilities Build and maintain backend services using Type Script and NestJS
Integrate third-party APIs, SDKs, and webhooks
Design and maintain REST APIs
Work with PostgreSQL, TypeORM, and database migrations
Integrate OpenAI, Speech-to-Text, and Text-to-Speech services
Requirements 5+ years of software development experience
Strong Type Script and NestJS experience
Strong PostgreSQL and TypeORM knowledge
Experience with REST APIs and third-party integrations
Experience with multi-tenant SaaS platforms
Understanding of LLM workflows and OpenAI integrations
Experience using AI coding tools such as Cursor, Copilot, or Claude Code
Ability to work independently with minimal supervision
Nice to Have Vue 3
Twilio, Vapi, WebRTC, or Eleven Labs
Stripe integrations

BullMQ, pg-boss, or similar background job tools

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📌 B Backend Engineer (Madrid)
🏢 HartleyCo
📍 Madrid