Java Software Engineer

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