10/14/2026 updated

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100 % available

Senior Backend / Platform Engineer (.NET, Docker, Distributed Systems)

Toulouse, France
Only remote
Engineer of Cybernetics and Robotics (Master's level), CTU Prague, 2015-2019
Toulouse, France
Only remote
Engineer of Cybernetics and Robotics (Master's level), CTU Prague, 2015-2019

Profile attachments

jan-trejbal-2026.pdf

AI AgentsASP.NETLinuxDevOpsEmbedded SystemsMessage BrokerSQL Databases.NET CoreBackendDockerMicroservices
.NET Backend Development
Expertise in designing and operating containerized .NET microservices powering customer-facing web, Android, and iOS applications, including modernization of legacy .NET Framework services toward ASP.NET Core and modern .NET runtimes.

Docker & Container Infrastructure
Extensive experience designing Docker-based runtime infrastructure and CI/CD processes for reliable deployments, with strong ownership across architecture, deployment, and observability.

Distributed Systems & Message-Driven Architecture
Proficiency in building authentication, message-driven workflows using RabbitMQ, and external integrations for business-critical distributed systems.

Database Management (MariaDB, PostgreSQL, Redis)
Hands-on experience with relational and in-memory databases including MariaDB, PostgreSQL, and Redis in production environments.

CI/CD & DevOps
Design and operation of CI/CD pipelines and production operations, including incident debugging and observability tooling such as Jaeger/OpenTracing.

Cloud & Azure
Development and maintenance of production PHP and .NET applications hosted in Azure, including infrastructure automation.

PHP & Web Backend
Development and maintenance of production PHP applications using Doctrine, NGINX, Memcached, and ASP.NET Core in cloud-hosted environments.

Authentication & Identity Integration
Implementation of authentication and authorization mechanisms against external identity providers and integration with government APIs such as Czech ISZR.

Open Source & Tooling
Author of several OSS projects including a Roslyn-based JSON serialization source generator, a Freshdesk API client for .NET, automated dependency update tooling, and a .NET health check exporter.

Additional Languages & Technologies
Additional experience with TypeScript, Python, Golang, Rust, Linux, NGINX, Caddy, embedded systems, and infrastructure automation.

Experience

Professional experience5 - 10 years
Freelancer since2017

Languages

EnglishFluentFrenchBasic knowledgeCzechNative speaker

Project history

Senior Backend Engineer

Aviationexam
Design and operation of containerized .NET microservices powering customer-facing web, Android, and iOS applications. Ownership of backend services across architecture, implementation, deployment, observability, and production debugging. Building authentication, message-driven workflows, and external integrations for business-critical systems. Contributing to modernization of legacy .NET Framework services toward ASP.NET Core and modern .NET runtimes. Tech: .NET, RabbitMQ, MariaDB, Redis, Docker, Jaeger/OpenTracing.

Argentine Tango Instructor

Studio 12
Part-time Argentine tango instructor and event organizer.

Backend Engineer

Scalesoft
Developed and maintained production PHP applications hosted in Azure. Designed Docker-based runtime infrastructure and CI/CD processes for reliable deployments. Implemented authentication and authorization against external identity providers. Integrated backend systems with external services, including Czech government ISZR APIs. Tech: PHP, Doctrine, MariaDB, NGINX, Docker, Memcached, ASP.NET Core, PostgreSQL.

C# Software Developer

Czech Academy of Sciences
Worked on the RIDICS portal, focusing on automated conversion of linguistic data into the platform's supported format.

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