At a Glance
- Tasks: Build and enhance Java backend services while managing Python ETL/data ingestion.
- Company: High-performing market maker in the heart of London.
- Benefits: Competitive pay, dynamic work environment, and opportunities for growth.
- Other info: Exciting chance to work in finance with a focus on innovative technology.
- Why this job: Join a lean team and make a significant impact on data-driven projects.
- Qualifications: Strong Java skills and some experience with Python and SQL.
The predicted salary is between 63000 - 77000 £ per year.
Contract Senior Java Developer – Data/Marketmaking Outside IR35 (6 month rolling) 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:
- 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
Contract Senior Java Developer – Data/Marketmaking employer: Quant Capital
Quant Capital is an excellent employer for those looking to thrive in the fintech sector, offering a vibrant work culture that fosters innovation and collaboration. With substantial training and development opportunities, employees can enhance their skills while enjoying a flexible hybrid work model in the heart of London. Join us to be part of a forward-thinking team that values growth and cutting-edge technology.
