We are looking for Senior Backend Software Engineer for a project in the energy sector.

Your role will focus on developing and integrating robust backend solutions for grid stability assessment and network security analysis systems using Python (80%) and C# (20%).

Duration : May 1 – December 31, 2026 (175 days, with optional extension)

Work Mode : 95% remote with minimal on-site visits (Berlin area)

Contract Type : Freelance Service Contract

Environment : Agile (Scrum) team with access to cutting-edge grid technology infrastructure

-Develop and maintain backend components for Dynamic Stability Assessment and Static Network Security Calculations

-Implement real-time and near-real-time network security analytics

-Ensure production quality, stability, security, and automated testing

-Collaborate with domain experts to translate complex requirements into robust technical solutions

-Support system rollout, documentation, and knowledge transfer

We are looking for candidates with:

-5+ years of professional backend development experience

-4+ years hands-on Python development in production environments

-1+ years practical experience with modern .NET / C#

-Strong Kafka expertise (core to the architecture)

-Experience with FastAPI, pytest, pydantic, protobuf

-.NET 8.0+, Microsoft.NET.Test.Sdk, NSwag

-Proven ability to design and maintain OpenAPI-compliant APIs

-Experience with JSON, XML, Protobuf data formats

-OpenTelemetry implementation experience

-S3 Storage experience (preferably Ceph)

Experience with microservices, Kubernetes, Helm Charts, PostgreSQL, or power systems engineering (grid modeling, SCADA, network analysis) would be a significant advantage.