Application Support Engineer

JR United Kingdom; City Of London; On-site; GBP 40,000 - 70,000; Full time

Job summary

A leading proprietary trading firm is seeking a technically curious Application Support Engineer to join their Unified Platform Support team in London. This hands-on role involves supporting high-performance systems for market data processing and regulatory reporting. The ideal candidate will have strong Linux skills, experience in a financial services environment, and the ability to debug code in Java and Python. Join a collaborative culture that values deep investigations and continuous learning.

Qualifications

• Experience in supporting high-performance applications in financial services.
• Ability to debug object-oriented code (Java and Python preferred).
• Proficiency in SQL and understanding of market/order data systems.

Responsibilities

• Monitor production systems for regulatory reporting and surveillance.
• Investigate and resolve data-related alerts and system issues.
• Provide L1/L2 support and assist in onboarding new teams.

Skills

Linux

Analytical skills

Problem-solving

SQL

Java

Python

Version control (Git/SVN)

Cloud infrastructure (AWS)

Tools

AWS

Kubernetes

Kafka

Argo

Job description

Application Support Engineer, London (City of London)

Client:

Selby Jennings

Location:

London (City of London), United Kingdom

Job Category:

Other

EU work permit required:

Yes

Job Views:

1

Posted:

23.05.2025

Expiry Date:

07.07.2025

Job Description:

We're looking for a technically curious Application Support Engineer to join the Unified Platform Support team at a leading proprietary trading firm. You'll work closely with developers to support complex, high-performance systems used for market data processing, regulatory reporting, and compliance analytics. This is a hands-on role that gives you the freedom to dig into issues - sometimes right down to the code.

Key Responsibilities:

• Monitor and operate production systems supporting regulatory reporting and surveillance functions
• Investigate and resolve data-related alerts and system issues, including code-level debugging when necessary
• Collaborate with developers to troubleshoot complex issues and drive long-term improvements
• Provide L1/L2 support to users across the firm (typically 2-10 issues per day), escalating to L3 when required
• Assist in onboarding new teams and applications to the platform support model
• Continuously refine monitoring processes and documentation as the platform evolves

What We're Looking For:

• Experience supporting and troubleshooting high-performance applications in a financial services environment
• Strong Linux skills and comfort working in command-line environments
• Understanding of market data and/or order data systems, including protocols like FIX or exchange-native formats
• Strong analytical and problem-solving mindset
• Ability to navigate or debug object-oriented code (Java and Python preferred)
• Familiarity with version control tools (Git or SVN)
• SQL proficiency - from writing queries to basic database operations
• Exposure to cloud infrastructure, ideally AWS
• Bonus: Experience with streaming/data tools such as Kafka, Spark, or Delta Lake

Technology Stack & Environment:

You'll be working with:

• AWS, Kubernetes, Kafka, Argo
• Java 17, Python 3, HDF5
• Distributed systems processing large volumes of market and order data
• A globally distributed team covering Europe and North America

Why Join This Team?

• Work closely with developers and gain exposure to complex systems architecture
• Be empowered to investigate issues deeply and shape solutions
• Join a respectful, collaborative culture that values outcomes over process
• Use the right tools for the job - and keep learning as the tech evolves