3 systems integration developer jobs found in London

Senior NetSuite Developer £500 - £550 per day (Outside IR35) This freelance opportunity offers the chance to lead complex NetSuite transformation programmes across multi-entity, international environments. You will take ownership of end-to-end solution design and delivery, working closely with senior stakeholders to shape scalable NetSuite architectures that support long-term business transformation. The Company They are a global organisation operating across multiple regions and business units, undergoing significant systems and process transformation. NetSuite sits at the centre of their finance and operational landscape, supporting growth, optimisation, and integration across the wider technology estate. The environment is complex, fast-moving, and collaborative, with a strong focus on long-term platform value. The Role and Deliverables Lead end-to-end NetSuite solution architecture and delivery across multi-entity and...

Senior .NET / Full Stack Developer – Hybrid – £500/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven We have a unique opportunity for a Senior .NET / Full Stack Developer to join a payments company. As a Senior .NET / Full Stack Developer , you’ll play a key role in building and scaling a high-throughput payments platform as the business enters its next phase of growth. This includes launching new products, enabling new partner integrations, and expanding a platform that already powers multiple live financial services products used globally. You’ll be building on top of a modern, cloud-native platform built with .NET and Azure , designed around API-first architecture and event-driven microservices . The platform supports complex payment flows, partner integrations, and high-volume transaction processing. This is a hands-on senior engineering role where you’ll contribute to architectural discussions, drive engineering best...

Opening: Join the Mission We deliver secure, mission‑critical platforms and services for government and regulated organisation’s operating in high‑assurance environments. Our teams work at the intersection of cloud engineering, DevSecOps, and platform enablement, helping organisation’s adopt Google Distributed Cloud (air‑gapped GCP). This role offers the opportunity to shape automation‑first testing strategies for new cloud‑native platforms, influence tooling and quality standards, and ensure solutions are secure, resilient, compliant, and testable by design. Role Purpose As an Automation Test Engineer, you will be responsible for designing, building, and operating automated testing capabilities across platform and application delivery teams. You will: Define and implement test automation strategies aligned to IaC, CI/CD, and DevSecOps practices Select, evaluate, and trade‑off test tooling suitable for air‑gapped Google Distributed Cloud environments Build and...