Contract Senior Java Developer - Data
Contract Senior Java Developer – Data
Up to £700 per day 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
Recommended Jobs
Staff Nurse (SO2)
Job Category : Social Care – Qualified Location : Bridgewood Nursing Home, Enfield Council Hours Per Week : 37.00 Start Date : Immediate start Start Time : 09:00 End Time : 17:30 Sal…
Inventory Manager (Mat Cover)
About us Pioneer in exclusive event-based private sales, Arlettie has been creating unique experiences for the world's leading Luxury Houses for over 20 years. In Paris, London, Milan, New York,…
Learning Support Assistant - Plumstead
We are seeking a committed, compassionate, and enthusiastic Learning Support Assistant (LSA) to join a friendly and inclusive primary school in Plumstead, starting as soon as possible. This is an exc…
Personal Trainer - Chelsea, London (Hiring Immediately)
Join the World’s Leading Personal Training Team at UP London Salary: starting from £30,800 and up to £43,300 annually Hours: 40 hours per week, full-time (including early mornings and late evenin…
Year 1 Teacher | Sutton
A welcoming primary school in Sutton is seeking a nurturing Year 1 Teacher to start January 2026. The Year 1 Teacher will deliver a carefully sequenced early-years-to-KS1 curriculum that secures rapi…
PE Teacher Sport-Focused Secondary School | East London
A popular and oversubscribed East London secondary school is looking for a motivated PE Teacher to join its dynamic department. This full-time role involves teaching KS3 and KS4 PE, promoting team…
Lead Consultant - Connectivity
The Opportunity Join a fast-growing B2B tech agency with big ambitions and real momentum. Work with innovative and world-leading brands to deliver integrated campaigns that create amazing opportun…
Customer Success Manager - iGaming
Who we are: TrueLayer is Europe’s fastest-growing Pay by Bank network. We power smarter, safer and faster payments by combining real-time bank payments with financial and identity data. E-commerce…
Teacher of History - Independent Girls' School - Camden
A distinguished independent Girls' School in Camden, Central London, celebrated for its strong humanities results and feminist academic ethos, requires a talented Teacher of History for a Maternity C…
KS2 Teacher | Good School | Lewisham | January 2026 Start
Are you a reflective KS2 Teacher seeking a Full-Time KS2 Teacher role from January 2026? A forward-thinking Good primary in Lewisham is recruiting a dynamic KS2 Teacher to join its Key Stag…