Backend Software Engineer C#

Core responsibilities:

• Design and build backend services in C# / .NET with a focus on performance, reliability, and long-term maintainability
• Shape and optimise PostgreSQL schemas and queries for high-volume, data-heavy use cases
• Develop resilient distributed systems using asynchronous patterns (e.g. SQS or equivalent messaging systems)
• Define and implement APIs that are consistent, scalable, and easy to work with across teams and external partners
• Work closely with frontend engineers, product, and design to deliver complete features across areas like identity, billing, content, and collaboration
• Continuously improve system performance using profiling, monitoring, and observability tools
• Take part in architectural decisions and influence how the platform evolves over time
• Support and guide other engineers through reviews, pairing, and technical discussions
• Contribute to deployment, monitoring, and operational reliability within AWS
• Actively reduce technical debt and keep the codebase in good shape as it scales

What we expect from you

You've built real systems, not just prototypes - and you understand what it takes to keep them running well.

• Strong experience with C# / .NET in production environments
• Ability to design and maintain scalable APIs (REST, GraphQL, or similar)
• Experience integrating external services - including handling auth flows, rate limits, retries, and failure scenarios
• Solid understanding of PostgreSQL, including schema design, indexing, and query performance
• Experience working with distributed systems and message queues (SQS, Kafka, Pub/Sub, etc.)
• Good instincts around performance, reliability, and observability
• Comfortable working cross-functionally to deliver complex, user-facing features
• Experience supporting and mentoring other engineers
• Able to operate in fast-moving environments where priorities evolve
• Strong debugging skills - able to trace issues end-to-end across services, logs, and external dependencies
• Familiarity with AI-assisted development tools and how to use them effectively
• Clear communicator who can work within an existing, evolving codebase (not just greenfield builds)

Nice to have

These aren't essential, but they'll help you hit the ground faster:

• Exposure to graphics-related technologies (e.g. CAD, Three.js, WebGL, WebGPU, 2D/3D concepts)
• Experience with real-time collaboration systems (e.g. SignalR, Y.js)
• Familiarity with AWS services across compute, storage, and managed infrastructure
• Experience with CI/CD pipelines (e.g. GitLab)
• Understanding of observability tooling (logging, tracing, monitoring)
• Experience working in Agile environments