Application Support Engineer

Application Support Engineer – Trading Systems (Fintech)

£500–£575/day Inside IR35

6-Month Contract - Hybrid (London – 3 days) - With the option to convert to perm.

You'll be working in a front-office trading environment in Central London. The business is scaling its support and engineering capability across critical trading and post-trade systems.

They are investing heavily in automation, resilience, and next-gen tooling (including AI/LLMs), creating a role that sits beyond traditional support — closer to engineering, optimisation, and platform ownership.

This hire is driven by growth, system complexity, and the need to modernise workflows across both execution and post-trade operations. Strong likelihood of long-term extension or permanent conversion.The Role

This is a high-impact support & engineering role within a live trading and post-trade ecosystem:

• Own stability and performance of production trading and post-trade systems
• Drive automation across support processes (PowerShell / Python)
• Troubleshoot complex issues across Windows, SQL, and integrated applications
• Work closely with traders, ops, and vendors to resolve and prevent issues
• Improve post-trade workflows, reconciliation, and data processing pipelines
• Influence system improvements and future platform direction
• Engage with vendor platforms (e.g. TT, ATEO or similar post-trade/reconciliation solutions)

What We’re Looking For

• Strong PowerShell and/or Python scripting capability
• Experience in trading / financial services environments
• Solid Windows and SQL background
• Exposure to post-trade or reconciliation platforms - Preferably Trading Technologies ATEO system or similar such as Duco, SmartStream, etc.)
• Proven track record of automating and improving support functions
• Comfortable in high-pressure, front-office-aligned environments
• Interest or exposure to AI / LLM tooling (bonus)

Why This Role

• Direct impact across trading and post-trade operations
• Blend of support, automation, and engineering ownership
• Exposure to AI-driven initiatives and modernisation work
• Clear path to long-term role in a growing platform environment

To apply – click the link or email Barry.Ansell@HarringtonStarr.com for a faster response