Java Software Engineer – Data Engineering

Up to £70,000 + 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 validation)
Improve service reliability: monitoring/logging, sensible alerting, and predictable deployments via CI/CD

Tech:

Java (primary), Python (secondary), AWS, PostgreSQL + Git, CI/CD, logging/monitoring

What they want:

2–5 years of experience building production systems (or equivalent ability)
Strong Java fundamentals (OO design, APIs/services, concurrency basics, testing)
Some UI development
Comfortable with SQL/PostgreSQL
Some Python experience (enough to manage and improve existing ETL/ingestion)

Nice to have

Any finance or markets exposure
Familiarity with common AWS patterns for running services and pipelines

Why this role

Broader scope than pure app dev: you’ll understand the data feeding the platform
Lean team, high impact, strong growth runway

My client is based London. Home work is encouraged but you will need to be able to come to the City if needed.

Junior Java Software Engineer - Data Engineering

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