Senior Backend Engineer - Real-Time AI Agents

FDE Times; Cresta; On-site; CHF 98,000 - 148,000; Full time

Benefits offered by this job

Medical, dental, and vision plans

Parental leave

Health & Wellness allowance

Remote work stipend

Lunch reimbursement

Job summary

Cresta’s AI Agent backend team is building production-grade infrastructure that lets AI Agents operate in real-world contact-center environments, integrating with CCaaS platforms and enabling seamless AI-to-human handoffs.

As a backend engineer you will design scalable services, manage real-time state, ensure security and observability, and collaborate with ML engineers to operationalize AI capabilities in live deployments.

Qualifications

• Bachelor’s degree in Computer Science or related field.
• 5+ years of experience building scalable backend systems in production environments.
• Strong experience designing and maintaining robust APIs (REST, gRPC).
• Solid understanding of distributed systems and real-time communication architectures.
• Experience integrating with third-party enterprise platforms and APIs.
• Experience working with CCaaS platforms or contact center systems is a strong plus.
• Familiarity with AI Agents, Virtual Agents, or LLM-based systems is a plus.
• Experience with containerized environments (Kubernetes, Docker).
• Experience with cloud platforms such as AWS, GCP, or Azure.
• Strong understanding of system reliability, observability, and security in enterprise environments.

Responsibilities

• Design and build scalable backend services that integrate Cresta’s AI Agents with customers’ CCaaS platforms.
• Architect systems that manage real-time conversation state, context propagation, and session lifecycle.
• Implement seamless AI-to-human handoff mechanisms, ensuring full context transfer and minimal disruption to the customer experience.
• Develop secure and reliable integrations with CCaaS APIs (voice, chat, messaging, routing, agent desktop, etc.).
• Collaborate closely with ML engineers and AI researchers to operationalize AI Agent capabilities in live environments.
• Ensure high availability, low latency, and strong observability for real-time conversation systems.
• Implement authentication, authorization, compliance, and enterprise security best practices across integrations.
• Drive improvements in reliability, performance, and scalability in production environments handling high interaction volumes

Skills

Backend systems

APIs REST/gRPC

Distributed systems

Real-time comms

Cloud platforms

Education

Bachelor's degree in CS or related

Tools

Kubernetes

Docker

AWS

GCP

Azure

Job description

Cresta’s AI Agent backend team is building production-grade infrastructure that lets AI Agents operate in real-world contact-center environments, integrating with CCaaS platforms and enabling seamless AI-to-human handoffs.

As a backend engineer you will design scalable services, manage real-time state, ensure security and observability, and collaborate with ML engineers to operationalize AI capabilities in live deployments.