C# API Integration Engineer (Hybrid)

Opus Recruitment Solutions; White Waltham; Hybrid; GBP 59,000 - 70,000; Full time

Job summary

A leading recruitment agency in the UK is seeking an experienced Integration Developer (C#) to work in a hybrid environment. The role involves building integrations with financial and telematics systems and requires solid C#/.NET experience, an understanding of modern APIs, and a security-first mindset. The position offers a salary of up to £70,000 and a collaborative culture that values longevity.

Benefits

Hybrid working

Competitive salary

Award-winning culture

Qualifications

• Solid experience with C#/.NET in integration-heavy environments.
• Deep understanding of REST, WebAPI, and event-driven architectures.
• Experience building fault-tolerant systems (retries, queues, circuit breakers).
• A security-first mindset (authentication, encryption, GDPR).
• Great communication skills.

Responsibilities

• Build and maintain integrations with financial systems, telematics platforms, and mapping APIs.
• Ensure everything runs smoothly, securely, and in line with GDPR.
• Help partners and customers set up integrations.
• Keep documentation, monitoring, and logging accurate.

Skills

C#/.NET experience

REST and WebAPI knowledge

Fault-tolerant system design

Great communication skills

Tools

Swagger/OpenAPI

Azure

Power Automate

Job description

A leading recruitment agency in the UK is seeking an experienced Integration Developer (C#) to work in a hybrid environment. The role involves building integrations with financial and telematics systems and requires solid C#/.NET experience, an understanding of modern APIs, and a security-first mindset. The position offers a salary of up to £70,000 and a collaborative culture that values longevity.