Full Stack Engineer

Full Stack Engineer

London / Hybrid | 4 Days Onsite

FTC £70,000 - £85,000

Harrington Starr has partnered with a leading financial services firm who are undergoing a major transformation of its internal technology landscape, modernising a suite of business-critical applications used across front office, compliance and operations teams.

They are now looking for an experienced Full Stack Engineer to join their Technology function and play a key role in migrating legacy SharePoint systems into a modern application portal built with contemporary web technologies. This is a high-impact role working closely with both technical teams and senior business stakeholders.

Key Responsibilities:

• Design and build full stack applications using C#, SQL Server and React
• Support and maintain live SharePoint applications during the transition phase
• Work within agile sprint cycles to deliver high-quality solutions
• Collaborate with business users to translate requirements into technical designs
• Ensure compliance with cyber security, data protection and regulatory standards
• Act as a technical escalation point within the Technology team
• Produce clear documentation and support knowledge transfer to BAU teams
• Work with third-party vendors where required

Key Requirements:

• 3+ years’ experience building applications with C#, SQL and React
• 2+ years’ experience developing or supporting SharePoint systems
• Strong front-end skills (HTML, CSS, JavaScript)
• Experience working in agile delivery environments
• Exposure to regulated industries (financial services preferred)
• Strong communication skills and stakeholder management ability

Key Benefits:

• Work on a large-scale modernisation programme with real business impact
• High level of autonomy and technical ownership
• Exposure to multiple areas of financial services
• Hybrid working with flexibility
• Opportunity to shape long-term internal platforms

This is an excellent opportunity for a hands-on Full Stack Software Engineer to join a highly visible programme of work within a regulated financial environment. You’ll be responsible for redesigning and rebuilding core internal applications, ensuring they are scalable, secure and aligned with long-term business needs.

You’ll be involved across the full lifecycle — from requirements gathering and system design through to development, deployment and handover into support.

Please apply via the link provided or reach out for a confidential conversation.