Senior Integration Developer/ Architect

This is a remote position.

You will design and build robust, secure, API-led integration solutions using C# / .NET and the Microsoft Azure stack, own solution architecture and technical design, from HLD/LLD through design patterns and trade-off decisions, and provide ongoing production support to ensure the stability and performance of business-critical systems in a regulated banking environment.

This is a design-led role.

We are looking for a senior engineer who operates at architect level, comfortable owning end-to-end solution design, applying design patterns and articulating design decisions, while remaining fully hands-on with development and production support.

• Own and author High-Level Design (HLD) and Low-Level Design (LLD) documentation for integration solutions.
• Create UML diagrams (sequence, flow, component ) using Draw.io or equivalent.
• Define integration patterns and drive overall solution architecture, making and clearly articulating design decisions and trade-offs.
• Apply established software and enterprise integration design patterns, and guide their consistent use across solutions.
• Design event-driven and messaging architectures with proven reliability patterns (retries, dead-letter queues, idempotency, circuit breakers).
• Design and develop integration solutions, APIs, and workflows using C# / .NET Core and API-based architecture.
• Implement event-driven, asynchronous, and messaging-based integration patterns.
• Apply API design best practice (contract-first design, versioning, security) and manage APIs through Azure API Management.
• Design and optimise serverless workloads (Azure Functions), including scaling, performance, and cost considerations.
• Optimise databases for performance, including indexing strategies, execution plans, and query tuning (Azure SQL / Entity Framework).