Full-stack AI Engineer

Full-stack AI Engineer at TrafficStars, an international ad network. Relocation to Limassol, Cyprus. Salary €5000-6000 net. Develop AI systems, integrate with ClickHouse, Postgres, and Kubernetes.

We are an international advertising network processing over 10 billion events daily in a ClickHouse cluster of 3.6 petabytes. Infrastructure includes 500+ servers across Europe and the US. The role involves relocation with family to Limassol, Cyprus, and full official employment. About the product: We quickly test new models, agent frameworks, and tools. If a technology proves useful, it soon goes to production; otherwise, we discard it and move on. Tasks: - Approximately half the time on development, the other half on maintaining speed, security, and quality of the whole system. - Build features end-to-end: data schema, API, background tasks, interface, and production launch. - Develop AI systems that perform real tasks: agents, assistant tools, retrieval, streaming, and evaluation. - Control token costs and model efficiency. - Quickly test new models, Agent SDKs, and MCP servers, measure results, and decide on adoption. - Integrate AI with Postgres, ClickHouse, internal APIs, Slack, email, and LLM providers via OpenRouter. - Run long-running and scheduled processes via Trigger.dev, ensuring correct retries without duplicate actions. - Review PRs from multiple teams and their AI agents before production release. - Find issues with access rights, data leaks, heavy queries, and conflicting migrations. - Improve skills, rules, and CI checks for coding agents. - Perform migrations and deployments in Kubernetes independently, and roll back changes when necessary.

Requirements: - At least 3 years of experience developing real products and full-stack development in production. - Practical experience with LLM features: tool calling, streaming, context management, retries, caching, and cost control. - Daily work with AI coding agents: Claude Code, Codex, Cursor, or similar tools. - Ability to delegate tasks to agents and verify their results. - Strong proficiency in TypeScript, React, and Next.js. - Experience with Postgres: schema design, migrations, indexes, and query optimization. Supabase experience is a plus. - Practical understanding of Docker and Kubernetes: deployment, reading logs of problematic pods, and rollback. - Knowledge of security basics: access control, injection protection, and secrets management. - Understanding of applied AI security: prompt injection, personal data protection, and minimal necessary permissions for tools. - Ability to evaluate AI quality using test sets and regression checks. - Proficient in Git, including resolving complex conflicts between parallel branches. - Ability to turn an unstructured business request into a working first version of the product. Nice to have: - Experience with ClickHouse or other analytical databases. - Knowledge of OpenTelemetry, Grafana, and debugging with traces. - Experience building internal tools or developer platforms. - Experience in ad-tech: working with advertisers, publishers, and ad formats.

Why you might like this job: - High development pace and real internal users from day one. - Opportunity to work with the latest AI models and agent tools. - High autonomy and ability to influence AI usage across the company. We offer: - Work laptop of your choice: Mac or PC. - Company-paid tickets to Cyprus. - Assistance with family relocation from any region. - Work visa for the employee and guest visa for family members. - Accommodation for the first month. - Medical insurance and mobile communication. - Free lunches and drinks. - Free English courses. - Sports activities paid. - Partial payment for schools and kindergartens.