Principal Full-Stack Engineer (Java,React,LLMs)

RE Partners

Manchester, UK

3 months ago

Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Working hours

Regular working hours

Job source

find.jobs

Tech stack

Java (Programming Language) Application Programming Interfaces (APIs) Artificial Intelligence Amazon Web Services Microsoft Azure Software Quality Code Review Databases DevOps Distributed Systems Performance Tuning Data Processing

+5 more

ReactJS Large Language Models Spring-boot Backend Front End Software Development

Job description

Lead the design and development of scalable backend services in Java (Spring Boot)
Build and optimize secure, high-performance APIs
Contribute to and guide React-based frontend architecture
Work hands-on with LLM/AI technologies (Claude or similar), integrating them into real-world applications
Drive best practices across code quality, architecture, and performance
Mentor engineers and support UI developers in delivering high-quality solutions
Partner with stakeholders to translate business needs into technical execution
Contribute to system design discussions, code reviews, and continuous improvement

Requirements

This role is ideal for someone who combines deep backend expertise in Java with strong frontend capabilities in React, and hands-on experience working with LLMs (Claude preferred)., * Strong experience in Java backend development and server-side architecture

Solid React experience on the frontend
Hands-on experience with LLMs / AI tools and practical implementation
Experience designing and building scalable, distributed systems
Strong understanding of APIs, databases, and performance optimization
Proven ability to lead technically and mentor others

Nice to have:

Experience with GraphDB, Scala, or complex data processing systems
Exposure to cloud platforms (AWS, Azure, or GCP)
Familiarity with CI/CD pipelines and DevOps practices

About the company

We’re hiring a Principal Full-Stack Engineer to join one of the largest banking institutions in the U.S. - a highly complex, high-impact environment where engineering decisions truly matter., At RE Partners, we partner with industry leaders to deliver high-impact technology solutions. We’re not a traditional staffing agency - we operate as a true consulting partner, helping organizations navigate complex digital transformations. Our global team, diverse culture, and strong delivery model have made us a trusted partner to Fortune 1000 companies.

If you’re excited about building at scale, working with cutting-edge AI, and operating at a principal level - let’s connect.