Senior AI Backend Engineer (AI)

TL;DR

Senior AI Backend Engineer (AI): Building an AI observability and evaluation platform for AI agents and LLM-powered applications with an accent on scalability, high-availability architecture, and performance. Focus on engineering secure, testable code in .NET/Go/Python, managing cloud infrastructure on AWS, and solving complex challenges in distributed systems.

Location: Hybrid, Sofia, Bulgaria

Company

A trusted provider of software enabling customers to develop, deploy, and manage responsible, AI-powered applications.

What you will do

• Develop secure, testable, and maintainable code following engineering best practices.
• Own features end-to-end from initial design through development to production delivery.
• Design and shape scalable, high-availability cloud architectures on AWS.
• Collaborate with an experienced development team on knowledge sharing and problem-solving.
• Participate in code reviews to ensure quality and continuous improvement.
• Operate within an agile process to support continuous delivery and rapid iteration.

Requirements

• Experience in software development with .NET services.
• Practical knowledge of Go, Python, and TypeScript.
• Expertise in containerization using Docker and orchestration.
• Experience in backend development of database-driven SaaS products.
• Proficiency in cloud architecture and AWS services including storage, networking, and load balancing.
• Experience with Infrastructure as Code using Terraform.

Nice to have

• Experience instrumenting applications with OpenTelemetry.
• Interest or experience working with LLMs, AI agents, or MCP.
• Experience building CI/CD pipelines for automated software delivery.
• Familiarity with analytical databases like ClickHouse.

Culture & Benefits

• Generous remuneration package and Employee Stock Purchase Plan.
• 30 days of paid annual vacation plus birthday and volunteering days off.
• Premium healthcare and dental coverage with additional pension insurance.
• Flexible working hours and work-from-home allowance.
• On-site gym with CrossFit equipment, climbing wall, and daycare center.
• Free underground parking with designated space for bikes and electric scooters.