Senior Backend Engineer

hace 1 semana

Barcelona, Barcelona, España Hiya A tiempo completo

About Us

At Hiya, we're on a mission to make voice communication secure, intelligent, and productive. We protect people from spam and fraud, connect businesses with their customers, and help secure global telecommunications.


Since 2015, we've been at the forefront of voice intelligence—starting with the first mobile caller ID and spam-blocking apps. Today, our Voice Intelligence Platform powers over 500 million users worldwide, partnering with leading telecoms and enterprises across Europe, North America, and beyond.

About the Position

We're building something new.
This role is part of a foundational team working at the intersection of backend systems, real-time voice infrastructure, and applied AI. You won't be maintaining legacy code or tweaking existing services—you'll be designing and building the backend platform from the ground up.
We're looking for engineers who get excited about greenfield architecture, who want to make early decisions that shape how a product scales, and who thrive when there's more whiteboard than runbook.


As a Senior Backend Software Engineer, you'll design and build the backend services and APIs that power Hiya's next-generation voice products. This is a backend-first role with opportunities to work across the stack when it adds value.

Our team builds products at the intersection of voice, telephony, and artificial intelligence. Our work spans both audio intelligence (e.g., deepfake detection, speaker verification) and conversational AI, focused on voice agents powered by LLMs, tool calling, and real-time telephony integration.

What You'll Do

  • Design and build backend services and APIs from scratch using TypeScript /

  • Make foundational architecture decisions that will shape the platform for years to come

  • Build systems that operate in real-time, high-availability voice environments

  • Integrate AI and LLM-based services to power intelligent voice experiences

  • Work with PostgreSQL-backed data stores and manage deployments using Docker and Kubernetes (GCP)

  • Collaborate with a small, senior team moving fast to find product-market fitThis is a hybrid role with 3 days per week in office

  • Travel Required on an as-needed basis

What You'll Need to Succeed

  • 4+ years of professional experience as a backend or backend-leaning full-stack engineer

  • Strong fundamentals in backend architecture, API design, and data-driven systems

  • Experience working with cloud infrastructure and CI/CD pipelines

  • Comfort with ambiguity—you know how to make good decisions without a playbook

  • Interest in applied AI and voice technology

  • Excellent communication and self-organization skills

Why Join Hiya?

We're building a team with diverse perspectives and backgrounds. Diversity and unique viewpoints make us stronger and more dynamic. We've won awards from Built In Seattle, Seattle Business Week, Deloitte Technology Fast 500, and Forbes' #1 Startup Employer. At Hiya, you'll find a supportive, empowering culture that encourages innovation and personal growth. If you want to help disrupt an industry and make a tangible impact, join us

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