Senior Backend Engineer

About us

Quantum HR is a premier human resources consulting firm dedicated to connecting exceptional talent with leading organizations worldwide. We specialize in providing bespoke recruitment solutions, leveraging deep industry insights and a global network to help companies build high-performing teams by matching them with professionals who truly fit their needs and culture.

About the role

We’re hiring a Senior Backend Engineer (.NET) to help scale our client, a field service management platform powering large-scale inspection operations.
You’ll work on the core backend (APIs, business logic, data layer) behind the company’s workflow, form builder, and report engines—focusing on simplifying a mature codebase and building scalable, configuration-driven systems that support enterprise clients without custom development.
This is a senior IC role with real ownership over system design and backend architecture as the platform evolves toward cloud scale.

Key responsibilities

• Design, build, and maintain scalable backend systems using .NET
• Simplify and refactor a mature, feature-rich codebase (improving structure, clarity, and maintainability)
• Develop clean, consistent, and consumer-friendly REST APIs
• Design modular, well-bounded system components
• Build and enhance configuration-driven platform capabilities (no-code/low-code style abstractions)
• Optimize database performance (queries, execution plans, indexing)
• Ensure system reliability (logging, failure handling, data integrity)
• Collaborate closely with cross-functional teams (frontend, mobile, QA)

Requirements

• Strong experience with .NET (Core and/or Framework)
• Solid experience with Entity Framework and SQL Server
• Strong SQL skills (query optimization, debugging performance issues)
• Proven experience building and designing REST APIs
• Strong systems thinking and ability to design modular, scalable architectures
• Experience working with production systems and maintaining long-term code quality

Nice to have

• Experience refactoring complex or legacy systems
• Experience building configuration-driven or extensible platforms
• Familiarity with AWS or cloud-based architectures
• Experience deploying applications on IIS
• Exposure to large-scale enterprise systems

Benefits

• High-impact role shaping a product at a key scaling stage
• Work on a platform used by large enterprise clients
• Strong growth trajectory toward global expansion and Gartner recognition
• Competitive package paid in USD