Senior Backend Software Engineer

About

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%).

Project Highlights

• 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

What You'll Be Doing

• 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

Required Skills

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)

Nice-to-Have

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