C#/.NET Developer

Avendra International - Europe; Greater London; Hybrid; GBP 90.000 - 130.000; Vollzeit

Benefits dieser Stelle

Flexible remote-first working

London in-person meetings

Zusammenfassung

Avendra International - Europe is seeking a Senior Backend Developer to scale our eProcurement SaaS platform. You will design, build and maintain high-performance backend services in C# and .NET, and implement secure REST APIs.

This role is remote-first in the UK with occasional London offices for meetings and workshops. You will own integrations with ERP, procurement and finance systems, handle OAuth/OpenID security, and drive reliability.

Qualifikationen

• Strong commercial experience developing applications with C# and .NET
• Proven experience designing, building and supporting RESTful APIs and system integrations
• Experience working within Agile software development environments
• Knowledge of API security, scalability and modern software engineering practices
• Strong problem-solving skills with the ability to work effectively in a remote-first team environment

Aufgaben

• Design, develop and maintain high-performance backend services using C# and .NET
• Build and evolve secure, scalable RESTful APIs for customers, partners and internal platforms
• Develop integrations with ERP, procurement, finance, eCommerce and other third-party systems
• Deliver secure API connectivity using OAuth 2.0, OpenID Connect and token-based authentication
• Design resilient, scalable solutions capable of supporting high transaction volumes
• Develop event-driven and message-based integrations using modern architectural patterns
• Troubleshoot production issues, identify root causes and implement sustainable improvements
• Contribute to technical design discussions, code reviews and engineering best practices

Jobbeschreibung

Location: UK Remote-based, with attendance at our London office for team meetings, workshops, planning sessions and company events as required.

We're looking for an experienced Senior Backend Developer to help build and scale the services, APIs and integrations that power our growing eProcurement SaaS platform.

This role plays a key part in connecting customers, suppliers and business systems through reliable, secure and high-performing backend solutions. You'll work on complex integrations, modern cloud technologies and API-driven architectures that help streamline procurement processes and support business growth.

You'll thrive in this role if you enjoy solving complex technical challenges, building scalable systems, and taking ownership of solutions from design through to deployment and ongoing improvement.

What you'll be doing

• Design, develop and maintain high-performance backend services using C# and .NET
• Build and evolve secure, scalable RESTful APIs for customers, partners and internal platforms
• Develop integrations with ERP, procurement, finance, eCommerce and other third-party systems
• Deliver secure API connectivity using OAuth 2.0, OpenID Connect and token-based authentication
• Design resilient, scalable solutions capable of supporting high transaction volumes
• Develop event-driven and message-based integrations using modern architectural patterns
• Troubleshoot production issues, identify root causes and implement sustainable improvements
• Contribute to technical design discussions, code reviews and engineering best practices

What we're looking for

• Strong commercial experience developing applications with C# and .NET
• Proven experience designing, building and supporting RESTful APIs and system integrations
• Experience working within Agile software development environments
• Knowledge of API security, scalability and modern software engineering practices
• Strong problem-solving skills with the ability to work effectively in a remote-first team environment

Nice to have

• Microsoft Azure development experience, including Functions, API Management, Service Bus and CI/CD automation
• Experience working with SaaS platforms and cloud-native architectures
• Knowledge of asynchronous messaging, event-driven or microservices architectures
• Experience integrating ERP, finance, procurement, hospitality, healthcare or eCommerce platforms
• Microsoft or Azure certifications

What we offer

• The opportunity to influence the architecture and future direction of a growing SaaS platform
• A collaborative, supportive engineering team that values knowledge-sharing and continuous improvement
• Flexible remote-first working with opportunities to collaborate in person
• Ongoing professional development and exposure to modern technologies and integration platforms

We are committed to creating an inclusive workplace where everyone can thrive. We welcome applications from people of all backgrounds, experiences and perspectives, and we believe that diverse teams create better outcomes for our colleagues, customers and business.