This is a remote position.
Role Overview
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.
Key Responsibilities
Solution Architecture & Design
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).
Enhance and maintain existing systems and interfaces.
Ensure adherence to coding standards and secure development practices.
Build and maintain CI/CD pipelines using Azure DevOps.
Manage source code using Git-based workflows.
Support automated deployment across environments.
Participate fully in Programme Increment (PI) Planning, sprint planning, backlog refinement, daily stand-ups, and retrospectives.
Contribute to estimation, capacity planning, and delivery commitments.
Ensure all work is accurately tracked and kept up to date in Jira.
Provide L3 escalation support and support L1/L2 engineers in resolving incidents.
Perform root cause analysis (RCA) and resolve incidents in line with agreed SLAs.
Monitor, optimise, and continuously improve system stability and performance.
Produce runbooks, operational guides, and release notes, and complete knowledge transfer to support teams.
Essential Skills
8+ years' experience in software development, with strong hands-on expertise in integration and API development and proven solution-design ownership.
C# / .NET Core.
HLD/LLD authoring and UML-based design (Draw.io or equivalent).
Software and integration design patterns, with the ability to explain design decisions and trade-offs confidently.
Event-driven architecture and messaging, including reliability patterns (retries, dead-letter queues, idempotency).
Azure Integration Services: Function Apps, Logic Apps, Service Bus, and API Management.
Database and performance optimisation: indexing, execution plans, and query tuning.
Azure DevOps and Git.
CI/CD practices and automated deployment.
Agile / Scrum delivery.
