Backend Developer

Pro4all Cloud Services B.V; Woerden; On-site; EUR 65,000 - 90,000; Full time

Benefits offered by this job

Salary package

Job summary

Pro4all Cloud Services B.V. is seeking a back-end developer to design and implement robust backend and middleware components in C# and .NET, connecting our software, customers, and partners in an agile team.

You will build secure REST APIs, integrate with Azure Service Bus or similar, and operate Kubernetes-managed services, while implementing observability with Datadog and Serilog. The role offers a collaborative environment with opportunities to influence architecture.

Qualifications

• You’ll design and implement backend and middleware in C# and .NET with secure REST APIs.
• Strong experience with PostgreSQL and CQRS patterns is expected.
• Familiarity with DI, modular service architecture, and testable design.
• Experience with cloud and observability tooling is a plus.

Responsibilities

• Design and develop backend and middleware components in C# and .NET.
• Build testable, scalable software with robust architecture and tests.
• Ensure reliability with structured logging, traces, and health checks.
• Assist partners and customers with backend integration challenges.

Skills

C#/.NET

PostgreSQL

CQRS

Dependency injection

Distributed systems

Git

Tools

Kubernetes

Azure Service Bus

Swagger/OpenAPI

OpenTracing

Datadog

Serilog

OpenID Connect

JWT

Job description

You’ll build the backend and middleware that connect our software, customers, and partners. From the first prototype to a working integration, you’ll work with architects, developers, and product stakeholders in an agile team.

• Design and develop backend and middleware components in C# and .NET, including secure REST APIs and automation for internal and external integrations.
• Build testable, scalable, and robust software, supported by established architectural patterns and unit and integration tests.
• Keep services reliable and problems traceable with structured logging, distributed tracing, and health checks.
• Help partners and customers work through backend integration challenges.

Your profile

You’re comfortable building distributed backend systems with C# and .NET. You regularly use AI coding assistants such as GitHub Copilot or Cursor to handle boilerplate, refactoring, and tests, helping you ship faster and write cleaner code.

Your technical experience includes:

• Data and architecture: strong experience with PostgreSQL or other relational databases, a solid understanding of CQRS, publisher/subscriber, factory, and other design patterns, plus familiarity with dependency injection and modular service architecture.
• APIs and security: secure API design with JWT, OpenID Connect, and authentication middleware, alongside practical experience with Swagger/OpenAPI, Polly, and Git.
• Cloud and messaging: deploying and operating containerized services with Kubernetes, working with Azure Service Bus or similar messaging solutions, and working knowledge of cloud platforms, especially Azure.
• Observability: familiarity with Datadog, Serilog, OpenTracing, and related tools.

Why us?

You’ll join a growing international software company in a role with plenty to challenge you. There’s room to shape your own path: have a good idea, and you’ll get the chance to put it into practice.

• A good salary, a company laptop, and travel expense reimbursement.
• 25 vacation days and 8% holiday allowance.
• Time to exercise during working hours and delicious lunches at the office every day.

You’ll work in a beautiful office that’s easy to reach by public transport and car. There’s also plenty happening outside the work itself, with regular drinks, snacks, and activities such as paddleboarding, karting, and padel.

About us

20 years ago at Pro4all, we embarked on a challenging mission: to digitise construction. Why? Because we saw that, despite all good intentions, costly mistakes were being made and materials unnecessarily wasted. Thanks to our software, construction companies can now work together more efficiently, build more sustainably and possibly even contribute to solving the housing shortage. Our products are used daily by tens of thousands of professionals working in the construction industry.

But note that we are not just another software company. We are a team of passionate tech enthusiasts with years of experience. We believe digitalisation is the key to our customers' success. We want to move the (often conservative) construction industry and show that building can be easier (and more fun). Our solutions have contributed to the largest (and smallest) projects in the Netherlands and abroad such as: Amare, Coolblue and Schiphol Airport.