Java Software Engineer

Up to £100,000 + bonus and benefits4:1 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 Postgre

SQL. This si a growing team focused on data ingestion and building tooling for the wider firm.

• 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 Postgre
  
  SQL (schemas, migrations, performant queries, data validation)
• Improve service reliability: monitoring/logging, sensible alerting, and predictable deployments via CI/CD

Tech:

• 2–5 years of experience building production systems (or equivalent ability)
• Comfortable with SQL/PostgreSQL
• Some Python experience (enough to manage and improve existing ETL/ingestion)

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

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