Web Application Support Engineer - London

Pontoon; Greater London; On-site; GBP 46,000 - 77,000; Full time

Job summary

Pontoon in London’s Canary Wharf is seeking a skilled Web Application Support Engineer to ensure peak performance and availability of critical banking web apps. The role is long-term, with three days on-site each week under an umbrella contract, and a daily rate of £416.

You will troubleshoot issues with React, ASP.NET, Oracle, and SQL, coordinate with development teams, monitor performance, and assist deployments.

Qualifications

• Proven React and ASP.NET experience essential.
• Oracle and SQL expertise required.
• Experience supporting web applications in financial or corporate settings.
• Strong front-end and back-end web technologies knowledge.
• Familiarity with server environments and DBMS.
• Excellent problem-solving and communication skills.

Responsibilities

• Provide expert support for web applications, ensuring optimal performance and availability.
• Troubleshoot and resolve issues related to web applications, collaborating with development teams as needed.
• Monitor application performance and implement improvements based on user feedback and system analysis.
• Assist in the deployment of application updates, ensuring minimal disruption to business operations.
• Document technical issues and solutions to enhance knowledge sharing within the team.

Skills

React

ASP.NET

JavaScript

C#

HTML

CSS

REST

Tools

Oracle

SQL

Job description

Salary: £? - ? per year

Requirements:

• Proven React and ASP.NET experience is essential.
• Oracle and SQL expertise is required.
• Proven experience in web application support, ideally within financial or corporate settings.
• Strong understanding of web technologies, including HTML, CSS, JavaScript, C# and relevant frameworks.
• Familiarity with server environments and database management systems.
• Excellent problem-solving skills and the ability to work under pressure.
• Strong communication skills, with the ability to convey technical information to non-technical stakeholders.

Responsibilities:

• Provide expert support for web applications, ensuring optimal performance and availability.
• Troubleshoot and resolve issues related to web applications, collaborating with development teams as needed.
• Monitor application performance and implement improvements based on user feedback and system analysis.
• Assist in the deployment of application updates, ensuring minimal disruption to business operations.
• Document technical issues and solutions to enhance knowledge sharing within the team.

Technologies:

• AI
• ASP.NET
• C#
• CSS
• Support
• JavaScript
• Oracle
• React
• SQL
• Web
• REST

More:

We are a leading financial institution in the banking sector seeking a highly skilled Web Application Support Engineer to join our dynamic team. This long-term role is based in Canary Wharf, London, with 3 days a week onsite expected. The daily rate is £416.00 Umbrella, and the contract length is up to 2 years for strong candidates. We offer an excellent opportunity to contribute to the efficiency and reliability of web applications within a fast-paced environment. We are committed to innovation and excellence in the financial services industry, and we support an inclusive and accessible recruitment process with reasonable adjustments available where needed. We also use generative AI tools to support our candidate screening process, while all final decisions are made by our hiring team.

last updated 37 week of 2026