Remote .NET GraphQL API Engineer ERP/Inventory

CAMP Systems Private Limited; Polska; Hybrid; PLN 394,000 - 551,000; Full time

Job summary

CAMP Systems Private Limited is seeking a senior .NET API engineer for a remote role. You will design and extend GraphQL APIs over Quantum ERP data, ensure efficient data access with EF Core and Oracle, and fortify security with JWT-based authentication.

You will also write tests and help align API behavior with business rules across multi-tenant environments. You will collaborate with front-end and backend teams, document schemas, and contribute to performance benchmarking while delivering

Qualifications

• 4+ years building production APIs in C# / .NET (ASP.NET Core or Web API).
• Strong object-oriented C# and layered service architecture.
• Hands-on EF Core/EF6 and strong SQL; Oracle experience is a plus.
• Practical understanding of API security: JWT / bearer tokens.
• Proven unit tests experience and code coverage.
• Experience with ERP data models (finance / inventory).
• Clear written communication; document schemas and questions.

Responsibilities

• Design, build, and maintain GraphQL types, queries, mutations, and resolvers for Quantum ERP data.
• Extend EF Core data layer and Oracle wrappers; write efficient queries.
• Optimize GraphQL execution; use DataLoader to avoid N+1 queries.
• Maintain JWT-based authentication and multi-tenant scope.
• Translate business processes into API behavior consistent with Quantum rules.
• Write and maintain unit tests across API, business, and data layers.
• Support Angular client and keep schema/contracts in sync.
• Contribute to worker scheduled tasks and code reviews.
• Document graph types and Oracle dependencies surface relies on.
• Coordinate early with parity teams to avoid duplicating capability.

Skills

C# / .NET

EF Core / EF6

SQL

JWT / API security

Unit testing

ERP data modeling

Documentation & communication

Tools

GraphQL

Oracle

DataLoader

Job description

CAMP Systems Private Limited is seeking a senior .NET API engineer for a remote role. You will design and extend GraphQL APIs over Quantum ERP data, ensure efficient data access with EF Core and Oracle, and fortify security with JWT-based authentication.

You will also write tests and help align API behavior with business rules across multi-tenant environments. You will collaborate with front-end and backend teams, document schemas, and contribute to performance benchmarking while delivering