Junior Java Software Engineer – Data Engineering

Overview

In this Java-focused data engineering role, you will build backend services and APIs while owning straightforward Python ETL/ingestion to AWS and PostgreSQL. You’ll work in a lean, high‑impact team to scale data tooling for the trading platform. The role blends core Java development with data ingestion work in a hybrid (4:1) London setting. You’ll contribute to reliable deployments, monitoring, and production support while growing your data engineering capabilities.

Responsibilities

• Develop and enhance Java backend services (APIs, batch jobs, integrations) used across the business
• Write clean, testable code with strong engineering discipline (testing, code reviews, debugging, production support)
• Maintain and extend Python-based ingestion/ETL for data flow
• Work with PostgreSQL (schemas, migrations, performant queries, data validation)
• Improve service reliability through monitoring, logging, alerting, and CI/CD deployments
• Collaborate with cross-functional teams to integrate data pipelines and tooling
• Contribute to data ingestion initiatives and platform tooling for the firm
• Participate in production incident handling and on-call rotation
• Assist in optimizing data-related performance and reliability

Key requirements

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

• problem solving
• team collaboration
• adaptability
• Java
• Python
• AWS