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- Tasks: Lead the design and development of scalable backend services and optimise high-performance APIs.
- Company: Join a leading banking institution known for impactful engineering decisions.
- Benefits: Competitive salary, diverse culture, and opportunities for professional growth.
- Other info: Dynamic environment with opportunities to mentor and lead in a global team.
- Why this job: Work with cutting-edge AI technologies and make a real impact in digital transformations.
- Qualifications: Strong Java and React experience, plus hands-on LLM/AI tools knowledge.
The predicted salary is between 80000 - 100000 £ per year.
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. 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).
What you’ll be doing:
- 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
What we’re looking for:
- 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
Why join us?
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.
Principal Full-Stack Engineer (Java,React,LLMs) employer: RE Partners
Contact Detail:
RE Partners Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Principal Full-Stack Engineer (Java,React,LLMs)
✨Tip Number 1
Network like a pro! Reach out to your connections in the industry, attend meetups, and engage in online forums. The more people you know, the better your chances of landing that Principal Full-Stack Engineer role.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your projects, especially those involving Java, React, and LLMs. This will give potential employers a taste of what you can do and set you apart from the competition.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills and system design principles. Practice common interview questions related to backend services and APIs, so you can confidently demonstrate your expertise.
✨Tip Number 4
Don’t forget to apply through our website! We’re always on the lookout for talented individuals like you. Plus, it’s a great way to get noticed by our team and increase your chances of landing that dream job.
We think you need these skills to ace Principal Full-Stack Engineer (Java,React,LLMs)
Some tips for your application 🫡
Tailor Your CV: Make sure your CV reflects the skills and experiences that match the job description. Highlight your Java backend expertise, React frontend capabilities, and any hands-on experience with LLMs. We want to see how you fit into our high-impact environment!
Craft a Compelling Cover Letter: Your cover letter is your chance to shine! Use it to explain why you're excited about this role and how your background makes you the perfect fit. Don’t forget to mention your leadership experience and how you can mentor others in our team.
Showcase Your Projects: If you've worked on relevant projects, make sure to include them in your application. Whether it's building scalable systems or integrating AI technologies, we love seeing real-world examples of your work. It helps us understand your hands-on experience better!
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you don’t miss out on any important updates. Plus, it shows us you’re keen to join our team!
How to prepare for a job interview at RE Partners
✨Know Your Tech Stack Inside Out
Make sure you’re well-versed in Java, React, and LLMs. Brush up on your Spring Boot knowledge and be ready to discuss how you've built scalable backend services and optimised APIs. Prepare examples of your past projects that highlight your technical expertise.
✨Showcase Your Leadership Skills
As a Principal Full-Stack Engineer, you'll need to demonstrate your ability to lead and mentor others. Think of specific instances where you've guided teams or contributed to system design discussions. Be prepared to share how you’ve driven best practices in code quality and architecture.
✨Understand the Business Context
Familiarise yourself with the banking industry and the specific challenges it faces. Be ready to discuss how your technical skills can translate into solving real business problems. This will show that you’re not just a techie but also understand the bigger picture.
✨Prepare for Technical Questions
Expect in-depth technical questions related to backend development, frontend architecture, and AI integration. Practice coding challenges and system design scenarios. This will help you feel confident and ready to tackle any technical assessments during the interview.