Senior .NET Backend Software Engineer

A globally recognized Big Four professional services firm with a strong presence in Luxembourg, serving clients across the financial services sector within the CSSF/PSF regulatory environment.

The client operates an internal Digital Factory, a product-focused engineering unit embedded within the firm, responsible for building and delivering proprietary software across four core service lines: Tax, Assurance, Consulting and Corporate Services. The factory runs approximately 50 active projects across five product verticals, built on an Azure-based technology stack, with delivery teams split between Luxembourg and offshore locations.

The candidate will join Brightgrove's embedded team, working alongside existing placements including Product Owners, Engineering Leads, and specialists across the client's product verticals. On the client side, they will report to the Technology Solutions Lead and collaborate daily with Product Owners, Engineering Leads and development teams across verticals.
The client's Digital Factory is organized around three pillars: Product Management, Technology & Engineering and Digital Operations, and this role sits firmly within the Technology & Engineering pillar.

• Interview process that respects people and their time
• Professional and open IT community
• Internal meet-ups and resources for knowledge sharing
• Time for recovery and relaxation
• Bright online and offline events
• Opportunity to become part of our internal volunteer community

Backend Delivery & Development

Design, build, and maintain backend services and APIs consumed by frontend applications and shared platform components across verticals
Deliver production-ready code within Azure DevOps-managed sprint cycles — backlogs, pull requests, CI/CD pipelines
Own API contracts end to end — define, document, and deliver reliably, ensuring frontend teams are unblocked and cross-team dependencies are resolved proactively
Contribute to data modelling, service design, and integration architecture decisions within the vertical
Maintain high standards for code quality, test coverage, and technical documentation

Cross-Team Collaboration

Work closely with frontend developers, product owners, and engineering managers to translate requirements into technical solutions
Raise blockers early and communicate clearly — proactive status updates without being prompted
Participate actively in architecture and code reviews, holding a high technical bar across the team
Coordinate with the Enterprise Solution Architect (where in place) on cross-vertical integration patterns and shared service design

Technical Ownership

Take end-to-end ownership of backend features from design through deployment and production support
Identify and flag technical debt, propose realistic improvement paths, and contribute to ongoing platform stability
Evaluate new technical approaches and make pragmatic recommendations — balancing ideal solutions with delivery realities

5+ years of professional backend development experience in enterprise environments
Strong proficiency in .NET / C#, the client's primary backend stack
Solid experience designing RESTful APIs and working with relational databases at scale
Azure platform experience: App Services, Azure Functions, Azure SQL, Key Vault, Azure DevOps
Experience in regulated industries, financial services, audit, tax, or compliance environments strongly preferred
Proactive, delivery-focused mindset, moves work forward independently, does not wait for perfect requirements
Strong English communication skills, international team, English-only working environment
Degree in Computer Science, Software Engineering, or related field