Senior C# .NET Developer for Legacy System Migration

We are looking for an experienced C# .NET Developer to support the migration of legacy jobs into a modern data platform environment. The role is backend-focused and requires strong analytical skills, particularly in understanding existing job logic and transforming it into scalable, cloud-based solutions. You will play a key role in ensuring accurate data processing and contributing to the further development of a new data platform architecture. The position combines hands-on development with requirements analysis and optimization tasks. Cloud infrastructure experience, especially within AWS environments, is essential. This is a long-term contract opportunity for a technically strong and detail-oriented developer.

Details

Location: Fully Remote (onsite in Essen possible by arrangement)

Work Model: Remote

Employment Type: Contract, Full-time

Start Date: ASAP

Duration: 10 months+ (extension possible)

Language Requirements: English – Fluent

Key Responsibilities

Migrate existing jobs from a legacy system to a new platform

Analyze and understand existing job logic and data flows

Implement transformations and redesign processes within the new system

Ensure correct and reliable data processing

Contribute to the development and continuous improvement of the new data platform

Support requirements management, system maintenance, and optimization initiatives

Requirements

Strong experience as a C# .NET Developer (backend-focused)

Hands-on experience with AWS infrastructure (EC2, ECS, S3, Lambda)

Strong analytical skills, especially in data-driven environments

Solid understanding of ETL processes

Strong SQL Server and database expertise

Experience working with cloud-based data processing systems

Structured and solution-oriented working style

Fluent English

Nice to Have

Experience with WinForms

Experience with Azure DevOps pipelines

Trading domain knowledge

Experience integrating AI-based data or tooling solutions

Hands-on experience with VB6