Senior C# Developer

Contract Opportunity | Tier 1 Investment Bank | Canary Wharf

Overview

Our client, a Tier 1 Investment Bank based in Canary Wharf, is seeking an experienced C# Developer to join a strategic application modernisation programme. This role sits within a technology team responsible for evolving critical business applications, supporting a transition from legacy desktop solutions to modern web-based and cloud-enabled platforms.

The successful candidate will work across the full software development lifecycle, contributing to the enhancement of existing applications while helping shape the future-state architecture.

Key Information

Role: Senior C# Developer Location: Canary Wharf, London (Hybrid Working) Contract Length: 6 Months Initial Contract Rate: £416 per day (Inside IR35) Start Date: ASAP

The Programme

This role forms part of a wider transformation initiative focused on:

Modernising legacy desktop applications Migrating technology platforms from on-premise infrastructure to Azure Supporting the transition from desktop-based solutions to web technologies Improving application performance, maintainability and scalability Delivering new functionality aligned to business and regulatory requirementsThe successful contractor will work closely with development teams, business stakeholders and architecture functions to deliver high-quality software solutions within a complex enterprise environment.

Key Responsibilities

Develop and maintain enterprise-grade applications using C# Enhance and support existing WPF and WinForms applications Contribute to the migration of desktop applications towards web-based architectures Build and integrate APIs and backend services Write efficient SQL queries and stored procedures Collaborate with business analysts, architects and end users to understand requirements Participate in code reviews and promote development best practices Troubleshoot production issues and contribute to continuous improvement initiatives Support the adoption of Azure technologies as part of the broader cloud transformation strategy

Required Skills & Experience

Essential

Strong commercial experience developing applications using C#/.NET Proven expertise with WPF or Winforms Strong SQL or Oracle development skills Understanding of software design principles and development best practices Experience working within complex enterprise environments Experience working with Azure

Desirable

Experience with JavaScript Exposure to React Experience contributing to application modernisation programmes Knowledge of Azure cloud technologies Experience within Financial Services, Investment Banking or Capital Markets environments

Personal Attributes

Strong analytical and problem-solving skills Excellent communication and stakeholder management abilities Ability to work independently in a fast-paced environment Collaborative mindset and willingness to mentor junior developers Comfortable balancing support of legacy systems alongside modernisation initiatives

GCS is acting as an Employment Business in relation to this vacancy