Application Support Engineer

Harrington Starr; Greater London; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

Harrington Starr is looking for a candidate for a hybrid support and engineering role based in London. You will work in a front-office trading environment, driving improvements in automation and platform ownership. The position emphasizes stability and performance across trading systems.

Successful applicants will have strong PowerShell and/or Python skills, experience in trading environments, and a solid background in Windows and SQL. This role offers a direct impact on trading operations and significant exposure to AI initiatives.

Qualifications

• Strong PowerShell and/or Python scripting capability.
• Experience in a trading/financial services environment.
• Solid background in Windows and SQL.

Responsibilities

• Own stability and performance of production trading systems.
• Drive automation across support processes.
• Troubleshoot complex issues across Windows, SQL, and applications.

Skills

PowerShell scripting

Python scripting

Experience in trading environments

Solid Windows background

SQL knowledge

Exposure to post-trade platforms

Automating support functions

Interest in AI/LLMs

Tools

Trading Technologies ATEO

Duco

SmartStream

Job description

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