Full Stack Backend Developer (.NET Core and Python/Django)

We are looking for a Full Stack Backend Developer to join a dynamic and international team responsible for the end-to-end delivery of developer-facing products and platforms. You will work alongside backend and frontend engineers, API specialists, and cloud/infra experts to design, build, and maintain high-performance solutions that serve developers, partners, and customers.

The team values autonomy, humor, trust, and responsibility, and operates in an Agile/Scrum environment. You will have the freedom to innovate, learn, and take ownership of your work within a technically challenging and collaborative setting.

Your responsibilities will include:

• Design, develop, and maintain scalable backend services and APIs using .NET Core and Python/Django stacks
• Build and optimize microservices and event-driven architectures
• Implement automated testing, observability, and security across services
• Contribute to CI/CD pipelines and Infrastructure as Code deployments
• Develop APIs with robust authentication, rate limiting, and versioning
• Collaborate with front-end developers, DevOps, and product owners to deliver high-quality features
• Support and mentor peers, perform code reviews, and contribute to architectural decisions
• Troubleshoot and improve system reliability, scalability, and performance.

To be successful in this role, you should have:

• Strong foundation in Object-Oriented Programming (OOP), clean code, SOLID principles, and design patterns
• Experience with microservices, event-driven architectures, and asynchronous messaging
• Skilled with CI/CD pipelines and Infrastructure as Code (IaC)
• Proficient in RESTful API design, OpenAPI/Swagger, and OAuth2
• Hands-on experience with containerized environments (Docker, Kubernetes)
• Understanding of security best practices, observability, and monitoring
• Strong communication skills and a collaborative, ownership-driven mindset
• Visa requirements: Dutch / EU Citizen; or authorised to work in the Netherlands (Permanent Resident, or work permit / HSM visa holder)

Other Key Skills

NET Core (C#) Stack – Must-have:

• C# 10+ with .NET 6–9
• ASP.NET Core Web API, YARP
• Dependency Injection, Middleware, Filters
• Async programming
• Entity Framework Core or Dapper
• Unit/integration testing (xUnit, FluentAssertions)
• Logging, tracing, and monitoring
• OAuth2, API versioning, rate limiting, model validation
• OpenAPI/Swagger

Python / Django Stack – Must-have:

• Python 3.9+
• Django & Django REST Framework
• ORM (Django ORM / SQLAlchemy)
• Celery / Redis for background tasks
• OAuth2 authentication
• pytest / unittest
• Kubernetes
• Logging (Sentry)
• REST API best practices

Nice-to-have:

• Orleans (virtual actor model / grains)
• Event-driven patterns (NATS / SNS / SQS)
• ClickHouse integration for analytics
• Redis caching
• ECS Fargate deployments
• AWS CDK (TypeScript)

AWS Cloud-native Skills:

• AWS Lambda, ECS (Fargate), DynamoDB
• AWS CDK (TypeScript), CloudFormation
• S3, CloudWatch, IAM, API Gateway, Secrets Manager
• Monitoring & tracing (X-Ray, OpenTelemetry, CloudWatch Logs)
• Event-driven flows (EventBridge, SNS/SQS/NATS)

Data & Messaging:

• ClickHouse schema design and query optimization
• NATS JetStream (publish/subscribe, stream management)
• Redis caching and rate limiting
• DynamoDB (schema design, indexes, partitions)

DevOps & Tooling:

• CI/CD pipelines (GitHub Actions, Bitbucket)
• Docker Compose / Aspire for local dev
• Observability with OpenTelemetry, Serilog, Prometheus, Grafana
• Secrets management (AWS Secrets Manager / Parameter Store)
• Git, code reviews, linting, and code quality tools

What We Offer

• Salary range: Competitive, based on experience
• Employment type: Full-time (1.0 FTE), 1-year contract with possible renewal or permanent conversion
• Remote policy: Hybrid (2 days per week onsite)
• Location of position: Rotterdam, Netherlands
• Visa sponsorship: Available
• Mobility Allowance
• Mobile Contract
• Professional growth and development
• Immediate start available

Don’t meet all the criteria? No problem! We encourage you to apply if you’re passionate about security architecture and believe you can make a strong impact.