Senior .Net Developer

Senior Backend Freelancer / Architect (.NET / Azure)

Full-time - Remote - Immediate Start

About the Role

We are looking for an experienced Senior Backend Freelancer / Architect to support our platform at a critical growth stage. You will work directly with the CTO as a true sparring partner - discussing architecture decisions on eye level while also actively implementing complex backend features.

Our product is already live and revenue-generating. With the onboarding of major enterprise clients, we are now addressing scalability, distributed workflows, and architectural decoupling - without stopping feature delivery.

Responsibilities

Feature Development

• Design and implement complex backend features based on enterprise requirements
• Translate business rules into clean, maintainable services using DTO-based patterns
• Ensure proper domain modeling with clear separation of concerns (Bounded Contexts)

Architecture & Refactoring

• Refactor existing tightly coupled logic while implementing new features
• Gradually evolve the system from monolithic scripts to decoupled, testable services
• Introduce and maintain proper Dependency Injection and configuration management
• Shift from polling-based processes to event-driven architectures

Distributed Systems & Reliability

• Design and implement Sagas for distributed transactions
• Build idempotent message handlers and compensation mechanisms
• Integrate external systems using Anti-Corruption Layers and resilience patterns (circuit breakers)

Scalability & Multi-Tenancy

• Improve tenant partitioning and performance strategies
• Design fair, queue-based workload distribution across tenants
• Support scalable worker-based processing models

Tech Stack

• Backend: .NET 10 (latest/preview), C# 14
• API Framework: ServiceStack (DTO-first, KISS philosophy)
• Cloud: Azure PaaS (Functions, Key Vault, Application Insights)
• Messaging: Event-driven architecture (transitioning to message brokers)
• Database: PostgreSQL (OrmLite), Azure Blob Storage
• AI: Azure Document Intelligence, OpenAI (AI-native workflow expected)

Required Skills & Experience

Technical

• Extensive experience with .NET and modern C#
• Strong background in backend architecture and system design
• Practical experience with:
  • Bounded Contexts / DDD (pragmatic, not academic)
  • Event-driven systems and messaging
  • Distributed transactions (Sagas)
  • Experience with message brokers (e.g. Azure Service Bus, RabbitMQ)
  • Strong understanding of DTO-based architectures and service-oriented design
  • Cloud experience with Azure PaaS services

Working Style

• Excellent English communication skills (mandatory)
• Ability to collaborate closely with a senior CTO on architectural decisions
• Pragmatic mindset - focus on business value and readable code
• Comfortable using AI tools (Copilot, Cursor, etc.) to increase development velocity

What We Offer

• Long-term collaboration
• Full remote flexibility
• Competitive salary (based on experience)
• Modern tech stack and supportive development culture
• Opportunity to shape core system architecture
• Work on a modern, evolving enterprise platform
• High level of trust and autonomy

Interested?

Send us your CV, past project references, and your expected salary range.

We look forward to welcoming you to our team!