Developer

ECS Resource Group; Cheltenham; On-site; GBP 60,000 - 90,000; Full time

Job summary

ECS Resource Group is seeking a Senior Developer to join the Business Systems team in Cheltenham. You will develop, maintain, and evolve core business applications and integrations, ensuring scalable, reliable solutions that support day-to-day operations and growth.

You will work hands-on across development, database optimisation, and system integrations, collaborating with stakeholders to deliver pragmatic solutions and ongoing improvements using Microsoft technologies.

Qualifications

• Solid understanding of the full development lifecycle and deployment processes.
• Proven expertise in SQL Server performance tuning and data design.
• Experience with integrations, APIs, middleware, and data flows.
• Strong collaboration with stakeholders across the business.

Responsibilities

• Develop, maintain, and enhance business applications, integrations, and internal systems, ensuring scalable and reliable solutions.
• Work closely with stakeholders to understand requirements, provide technical guidance, and deliver pragmatic solutions.
• Support and improve existing systems by troubleshooting issues and optimising performance.
• Design and deliver system integrations (APIs, middleware, data exchange) with robust data flows.
• Take ownership of database performance including schema design, indexing, and tuning.
• Manage data processes such as imports, exports, transformation, and reconciliation across multiple systems.
• Contribute across the full development lifecycle: design, development, testing, deployment, and ongoing support.
• Support release management, version control, and deployment processes for stable system changes.
• Collaborate with internal teams and third-party suppliers to ensure integrations operate effectively.
• Drive continuous improvement by modernising legacy systems and leveraging AI/automation where appropriate.

Skills

C#

.NET

SQL Server

WPF

Windows Forms

Tools

OData

WCF

REST APIs

Connex

Job description

As a Senior Developer, you will play a key role in supporting, maintaining, and evolving our core business systems and integrations. Working within the Business Systems team, you will deliver reliable, scalable solutions that support day-to-day operations, improve user experience, and enable business growt

h.

This is a hands-on, varied role combining development, database optimisation, and systems integration. You will collaborate closely with stakeholders across the business, contributing to both new initiatives and continuous improvement of existing platfor

ms.

Your responsibilities as a Senior Developer will

• be:Develop, maintain, and enhance business applications, integrations, and internal systems, ensuring solutions are scalable, reliable, and user-focu
• sed.Work closely with stakeholders to understand requirements, provide technical guidance, and deliver pragmatic solutions aligned to business ne
• eds.Support and improve existing systems by troubleshooting issues, optimising performance, and enhancing usability and stabil
• ity.Design and deliver system integrations (APIs, middleware, data exchange), ensuring robustness, security, and effective data flow between platfo
• rms.Take ownership of database performance, including schema design, query optimisation, indexing strategies, and data integr
• ity.Manage and support data processes such as imports, exports, transformation, and reconciliation across multiple syst
• ems.Contribute across the full development lifecycle, including design, development, testing, deployment, and ongoing supp
• ort.Support release management, version control, and deployment processes to ensure controlled and stable system chan
• ges.Collaborate with internal teams and third-party suppliers to ensure systems and integrations operate effectiv
• ely.Contribute to continuous improvement by modernising legacy systems and adopting best practice development approac
• hes.Explore and implement opportunities to leverage AI and automation technologies to improve system efficiency, data usage and business processes, ensuring solutions are practical, secure and aligned with business ne

eds.

About

• Experience with full Microsoft development stack including WPF and Windows forms. Server integrations such as OData, WCF and other REST APIs.
• you:You will have strong experience in software development using Microsoft technologies (C#, .NET, SQL Ser
• ver).Solid understanding of the full development lifecycle, including support and continuous improve
• ment.Proven expertise in SQL Server, including performance tuning, database design, and query optimaisa
• tion.Experience with integrations, APIs, middleware (e.g. Connex or similar), and data flows (ETL, transformation, mapp
• ing).Ability to troubleshoot complex system and data issues across interconnected platf