Full job descriptionPrincipal Java Developer - VP | Java, Spring Boot, AWS | Investment Banking
Central London - Hybrid (Tuesday, Wednesday and Thursday in the office)
c£130,000 + bonus | Permanent
A global investment bank is looking for a hands-on Principal Java Developer to take technical ownership of a business-critical trading technology platform. You’ll stabilise it, modernise it and lead its migration to AWS.
This is a senior engineering role for someone who still writes code every day. You’ll work closely with the platform architect, set technical direction, and guide a team of experienced engineers and contractors.
The role
*Investigate and resolve complex technical issues across a large trading platform, including P&L and trade services
*Improve platform stability, reliability, performance and latency
*Design and build new services using modern Java (Java 25) and Spring Boot
*Lead the migration of existing applications to AWS, replacing legacy frameworks with cloud-native solutions
*Support the migration of the caching layer to Redis
*Use AI-assisted development tools (e.g. Amazon Kiro) to analyse legacy code and accelerate refactoring
*Provide technical leadership and mentoring while staying hands-on
Essential experience
*Extensive enterprise Java development, with recent hands-on production coding
*Strong Spring Boot and Spring ecosystem expertise
*Hands-on AWS experience, ideally gained on a cloud migration or modernisation programme
*Containerisation and cloud-native application design
*Financial services experience, ideally trading, front office or risk systems
*Solid understanding of functional programming concepts
*Strong architectural knowledge, and comfort working independently in complex environments with limited documentation
Desirable experience
*Scala (preferred), C++ or Python
*Redis, Hazelcast or other distributed caching
*Low-latency systems, idempotency and reliable processing
*Day-to-day use of AI coding assistants
What’s on offer
*VP-level Principal role with real influence over technical direction
*Large-scale AWS modernisation programme
*Modern stack for new development: Java 25, Spring Boot, AWS, Redis, AI-assisted engineering
*Competitive base salary of c£130K plus bonus
*Consistent hybrid pattern: Tuesday to Thursday in central London, Monday and Friday remote
*Core hours 8:30-17:00
Apply
Apply now with a concise CV highlighting your Java, Spring Boot and AWS experience. Shortlisted candidates will receive full client details and a detailed briefing.
Lorien is acting as an employment agency in relation to this vacancy
Guidant, Carbon60, Lorien & SRG - The Vertage Group Portfolio are acting as an Employment Business in relation to this vacancy.