Senior Fullstack Engineer - AI

Overview

Senior Software Engineer SDE III (Full Stack) at Hiya Inc. Join to apply for the Senior Software Engineer SDE III (Full Stack) role at Hiya Inc.

About Hiya

At Hiya, we’re revolutionizing voice communication. Our mission is to modernize voice with intelligence for security and productivity. Since 2015, we’ve been at the forefront of voice intelligence innovation. Our Voice Intelligence Platform supports over 500 million users globally, with partners including British Telecom, EE, Virgin Media O2, Ericsson, Rogers, Bell Canada, MasMovil, Telenor, FICO, Twilio, and more.

The Position

This position is part of the Audio Intelligence team at Hiya, working on solutions for audio and speech leveraging AI and Deep Learning. Our products include AI Voice Deepfake Detection, Voice Authentication and Voice AI Agents, served via API for developers or as part of a no-code SaaS platform. The Senior Software Engineer is an Individual Contributor (IC) responsible for evolving the architecture of our SaaS platform (a REST API, a web console, demos, and integrations). You’ll design new services and flows involving CRUD operations, audio streaming and model inference. While primarily backend-focused, you’ll collaborate with R&D and product teams on integrating and experimenting with AI models, including prompts for AI-driven features, consuming external model APIs, and contributing to lightweight model-in-the-loop systems.

What You’ll Do

• Build and maintain REST / gRPC backend services using Rust and TypeScript.
• Build and maintain frontend services using SvelteKit.
• Design and maintain relational databases using Postgres.
• Write unit / integration / E2E / stress tests using Rust, TypeScript and Python.
• Write and maintain API documentation using OpenAPI and Docusaurus.
• Build CI pipelines using GitHub Actions.
• Containerize services using Docker and deploy to a Kubernetes cluster.
• Debug in staging and production environments using GCP tools.
• Integrate LLM-based features into the product (e.g., prompt engineering, calling AI endpoints, interpreting responses).

What You’ll Need To Succeed

Core Values and Team Fit

This role requires embodying Hiya’s values : serving customers, acting with initiative, continuous improvement, accountability, and contributing with a thoughtful point of view.

Nice-to-Have / Fast Start

The requirements listed are guidelines. You don’t have to satisfy every requirement. If your skills are transferable, we would love to hear from you.

More Details

This position is based in Barcelona, Spain.

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