Mid-Level Java Software Engineer

Java Software Engineer – Data Engineering

Up to £100,000 + bonus and benefits

4:1 hybrid in office – City of London

Quant Capital is hiring for a small, high-performing market maker in London. This is a junior-to-mid role focused primarily on Java development, with a secondary responsibility owning straightforward Python ETL/data ingestion into AWS and PostgreSQL. This is a growing team focused on data ingestion and building tooling for the wider firm.

What you’ll do:

• Build and enhance Java backend services (APIs, batch jobs, integrations) used across the business
• Write clean, testable code with solid engineering discipline (testing, code review, debugging, production support)
• Maintain and extend Python-based ingestion/ETL (pragmatic plumbing, not heavy data engineering)
• Work with PostgreSQL (schemas, migrations, performant queries, data val...