Senior .NET Integration Developer

Join to apply for the Senior .NET Integration Developer role at MCS Rental Software

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Join to apply for the Senior .NET Integration Developer role at MCS Rental Software

We\’re seeking a highly skilled Senior .NET Integration Developer to join our team in the UK.

Salary: £45,000 – £60,000 per year

The Company

For over 40 years, MCS Rental Software has been dedicated to helping rental businesses thrive. We provide cutting-edge rental management software, cloud solutions, and responsive technical support to companies worldwide. Our mission is to empower the rental industry through smart technology and outstanding service.

We’re proud recipients of the Culture 100 Award, which celebrates organisations that nurture their teams, reward performance, and foster inclusive, empowering environments. Our vibrant culture and mutual respect have contributed to an average employee tenure of over 10 years.

The Role

We are looking for an experienced Senior .NET Integration Developer to join our growing team. You’ll play a key role in developing and maintaining robust integrations with third-party systems such as financial services, telematics platforms, and mapping APIs. This is a high-impact role for someone passionate about secure, scalable, and reliable integration architecture in a global SaaS environment.

Responsibilities

• Integration Leadership: Develop and maintain secure, well-documented financial and third-party integrations.
• Framework Evolution: Enhance the integration framework for scalability, performance, and industry alignment.
• Partner Support: Assist customers and partners in integration setup and API/gateway usage.
• Telematics Integration: Support and expand integrations for features like event tracking and CO₂ reporting.
• Security & Compliance: Ensure integration development aligns with modern security and GDPR standards.
• Operational Excellence: Implement structured logging, monitoring, and documentation.
• Knowledge Sharing: Contribute to internal knowledge bases and explore automation tools (Power Automate, Zapier).

Why Work at MCS

• Award-winning culture with emphasis on respect, innovation, and long-term growth
• Flexible hybrid work model with a supportive team environment
• Opportunity to work on global SaaS products with real-world impact

You Should Apply If You Have

• Extensive experience with C# / .NET (Core or Framework) in integration-heavy environments
• Strong understanding of REST, SOAP/XML, event-driven architectures, and asynchronous messaging
• Hands-on experience in building resilient, fault-tolerant systems using retry patterns, queues, and circuit breakers
• Proficiency in integration security, including authentication, encryption, and GDPR compliance
• Excellent communication skills and ability to write high-quality technical documentation
• Familiarity with logging, monitoring, and observability best practices

It\’s a Bonus If You Have

• Experience integrating with financial or ERP systems
• Swagger/OpenAPI documentation for Open APIs
• Familiarity with Azure services and automation tools like Power Automate or Zapier
• Exposure to IoT or Telematics platforms
• Awareness of ISO 27001, SOC 2, or GDPR compliance standards

Hiring Process

• Introductory video call with our recruiter
• Online assessment
• Video call with the Hiring Manager
• Video call with the MD
• Final in person interview

Apply for the job

Do you want to join our team? Then we\’d love to hear about you!

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

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