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Apollo Solutions

Senior Dotnet Developer

Apollo Solutions
Belgium · Contract · Mid-Senior

We are supporting a leading banking and financial services partner on several business-critical digital initiatives, including core system modernization, regulatory enhancements, and the evolution of customer-facing platforms. We are looking for an experienced .NET Developer with a solid understanding of frontend technologies to join a modern, highly regulated engineering environment.


Logistics

  • Role: Freelance .NET Developer
  • Contract: 12 months (likelihood of extension)
  • Location: Brussels (Hybrid – 2 days/week on-site)
  • Languages: English + French or Dutch
  • Start Date: ASAP / Flexible
  • Rate: Competitive & negotiable


Responsibilities

  • Design, develop, and maintain scalable backend services using .NET / .NET Core
  • Contribute to greenfield initiatives and long-term platform modernization projects
  • Translate complex business and regulatory requirements into robust technical solutions
  • Apply clean code practices, testing, and collaborative development approaches
  • Support and evolve system architecture in line with modern best practices
  • Build and maintain solutions within CI/CD pipelines
  • Participate in code reviews and agile ceremonies
  • Collaborate with frontend teams to ensure end-to-end solution quality
  • Work on high-availability, security-sensitive financial systems


Required Skills

  • 5+ years of experience as a .NET Developer
  • Strong expertise in C#, .NET Core, ASP.NET
  • Solid experience with REST APIs
  • Good knowledge of relational databases (SQL Server, PostgreSQL, Oracle, or similar)
  • Experience with CI/CD tooling and Git-based workflows
  • Working knowledge of frontend technologies (Angular, React, TypeScript)
  • Familiarity with Docker and modern deployment practices
  • Comfortable working autonomously in Agile/Scrum teams


Nice to Have

  • Experience in banking or financial services
  • Exposure to legacy modernization or core system transformation
  • Knowledge of security or regulatory constraints
  • Experience with cloud platforms (Azure, AWS, or hybrid)
  • Familiarity with event-driven or messaging-based architectures


Interested? Get in touch to discuss details and next steps.

Key Skills

Ranked by relevance

postgresql sql server angular docker oracle server react cloud git sql aws
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Posted
Feb 06, 2026
Type
Contract
Level
Mid-Senior
Location
Brussels

Industries

Banking Financial Services

Categories

Information Technology

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