Killian Castrec

Backend and versatile developer, I support companies in structuring, exploiting, and automating their data to gain efficiency and visibility over their activities.

My expertise revolves around advanced SQL (modeling, complex queries, optimization, reporting) and data visualization, particularly with Power BI for creating clear, relevant, and decision-oriented dashboards. I am accustomed to transforming raw data into actionable indicators for business teams (activity monitoring, performance, service quality).

I also work on process automation via n8n: tool synchronization, business workflow automation, document generation, notifications, API integrations... Objective: reduce manual tasks and make data flows reliable.

On the development side, I primarily work on backend environments (PHP/Symfony, C#, SQL), with a strong focus on robustness, maintainability, and security. I also have solid experience in internal tooling, monitoring (Grafana), and third-party system integration (CRM, peripherals, APIs).

Appreciated for my analytical skills, autonomy, and clear communication, I integrate easily into both technical and business teams. I can be involved in one-off missions (dashboards, automation, audits) or in longer-term support.