Java Software Engineer

Job Description

Java Developer -- Data £140,000 Plus Large Prop Bonus In office -- City of London Quant Capital is hiring for a small, high-performing market maker in London. This is a Mid-to-Senior 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: 10 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