Contract - Java Developer

Job description

Job Title: Java Developer (contract)

Location: London Hybrid 2-3 days a week in the London office

Duration: 4 months

Contract Start Date: ASAP *please note that onboarding will take 4-6 weeks from the offer

Day Rate: Competitive (Inside IR35)

Deloitte

Working with the Deloitte Associate (Contractor) Programme means we can offer you the opportunity to work on a variation of industry and client related projects. Our aim is to retain the best talent and so when your project end date nears our team of Talent Community Advisors will be working with you to look at alternative projects within the firm that suit your experience should you wish to continue with Deloitte.

The Role

We are looking for a Java Integration Engineer to analyse, enhance and integrate complex enterprise applications within a global financial services environment. The role will use Java, Oracle and the Spring Framework to support highly customised legacy platforms and process large-scale external data feeds. You will help protect data integrity across downstream ledger, risk and margin systems by documenting data lineage and metadata. Working across Agile and Waterfall delivery, you will translate business requirements into robust technical solutions and collaborate effectively within a highly matrixed organisation.

Essential Skills and Experience

• Proven hands-on expertise in Java (Core and Enterprise) is essential
• Desirable: Strong Oracle Database experience, including SQL and PL/SQL optimisation.
• Desirable: experience working collaboratively within complex, global financial services environment.
• Expertise across the Spring Framework (Spring Boot, Spring Batch and Spring Integration).
• Ability to reverse-engineer, analyse and integrate complex, highly customised legacy enterprise applications.
• Strong data management capability, including ingestion and transformation of large-scale external feeds (e.g. daily CCP clearing files or market data)
• Experience documenting data lineage and metadata, while maintaining strict data integrity across downstream ledger, risk and margin systems.
• Extensive experience operating within structured SDLC environments using Agile and Waterfall methodologies.
• Advanced proficiency in enterprise collaboration and delivery tools.
• Strong communication, listening and influencing skills, with the ability to translate business requirements into technical implementation.

Deliverables: Responsibilities but not limited to:

• Design and build Spring Batch and Spring Integration pipelines to ingest, transform, and validate large-scale daily CCP clearing and market data feeds
• Produce comprehensive architectural specifications and interface inventories by reverse-engineering legacy code, PL/SQL packages, and database dependencies
• Establish robust data mappings, lineage tracking, and schema definitions that maintain strict ledger, risk, and margin data integrity
• Develop scalable, highly concurrent Java and Spring Boot microservices backed by optimized, low-latency Oracle SQL and PL/SQL procedures
• Coordinate with multi-disciplinary global stakeholders to deliver clear, business-to-technical functional designs and end-to-end Agile/Waterfall deployment artifacts

IR35

As a means of managing tax, commercial and reputational risks, Deloitte prohibits the use of Associates through Personal Service Companies (‘PSCs’). All Associates must contract under PAYE arrangements through a Deloitte approved ‘Employment Company’ (aka ‘umbrella company.’)

Basic information

Location

London

Business Line

Technology & Transformation

Job Type

Contract

Date published

14-Sep-2026

Req #

25115