Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Design and develop scalable backend systems to empower financial freedom.
- Company: Join a visionary company aiming for a global financial system without hidden fees.
- Benefits: Enjoy competitive salary, stock options, and paid annual leave.
- Why this job: Make a meaningful impact in a fast-growing company while working with cutting-edge technology.
- Qualifications: 7+ years in backend development with strong Java skills and excellent communication.
- Other info: Work from the London office at least once a week.
The predicted salary is between 43200 - 72000 £ per year.
Who we are
Our vision is simple: a global financial system, without hidden fees or unfair FX rates. With control in the hands of the users instead of the hands of banks. With fund management capabilities to grow your savings for decades and build generational wealth.
What we’re looking for
Do you want to build robust systems that empower financial freedom? As a Lead Backend Engineer, you’ll design, develop, and maintain scalable, secure, and high-performing backend systems that power our innovative products. You’ll collaborate with a talented team to create solutions that drive financial inclusion and transform the way people manage their money. If you’re excited to solve complex challenges and make a meaningful impact in a fast-growing company, we’d love to hear from you!
What you’ll be doing
- The work will focus on greenfield development and improvement of existing systems
- Projects will include building REST APIs, engineering microservices and evolving a number of systems that our business depends on (e.g. card payments, treasury management, transactions booking, crypto liquidity)
- Our technology stack is based predominantly on Java 25 on the backend with Postgres database
- We rely on Spring Boot for quick and quality delivery
- We have a pragmatic approach to develop our business logic, focusing on clean code, with emphasis on maintainability and fast turnaround with TDD, DDD and continuous integration & delivery
What you’ll need
- Minimum 7+ years of experience in Backend development, with fluency in Java
- Quick learner with an ambitious and results driven personality, with excellent communication skills (english fluency, verbal and written)
- Track record of building complex products that millions of people use in hyper-growth startups
- Willingness to work from the London office at least 2 days per week
Benefits
- Competitive salary
- Sign-on stock options bonus, so you become part of the success of the company
- Discretionary performance bonus (stock options)
- Paid annual leave
- Own the development process that will face on the customer\’s impact
- Latest technology to work with
- Strong team that will help you improve your skills
#J-18808-Ljbffr
Lead Software Engineer, Java employer: Castleisland
Contact Detail:
Castleisland Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Lead Software Engineer, Java
✨Tip Number 1
Familiarise yourself with our technology stack, especially Java 21 and Spring Boot. Being well-versed in these technologies will not only boost your confidence during discussions but also demonstrate your commitment to the role.
✨Tip Number 2
Showcase your experience with building REST APIs and microservices in previous roles. Be ready to discuss specific projects where you tackled complex challenges, as this will highlight your problem-solving skills and technical expertise.
✨Tip Number 3
Prepare to discuss your approach to clean code, TDD, and DDD. We value maintainability and fast turnaround, so sharing examples of how you've implemented these practices in past projects will set you apart from other candidates.
✨Tip Number 4
Emphasise your ability to work collaboratively within a team. Since you'll be part of a talented group, demonstrating your communication skills and willingness to learn from others will show that you're a great fit for our culture.
We think you need these skills to ace Lead Software Engineer, Java
Some tips for your application 🫡
Tailor Your CV: Make sure your CV highlights your experience in backend development, particularly with Java. Include specific projects where you've built REST APIs or worked with microservices, as these are key aspects of the role.
Craft a Compelling Cover Letter: In your cover letter, express your passion for financial technology and how your skills align with the company's vision of empowering users. Mention your experience in hyper-growth startups and your approach to clean code and TDD.
Showcase Relevant Projects: If you have a portfolio or GitHub repository, include links to projects that demonstrate your ability to build scalable systems. Highlight any work with Spring Boot and Postgres, as these technologies are part of their stack.
Prepare for Technical Questions: Anticipate technical questions related to Java, backend development, and system design. Be ready to discuss your problem-solving approach and how you've tackled complex challenges in previous roles.
How to prepare for a job interview at Castleisland
✨Showcase Your Java Expertise
Make sure to highlight your extensive experience with Java, especially version 21. Be prepared to discuss specific projects where you've used Java to build scalable backend systems, and how you approached challenges in those projects.
✨Demonstrate Problem-Solving Skills
Since the role involves solving complex challenges, be ready to share examples of how you've tackled difficult problems in previous roles. Use the STAR method (Situation, Task, Action, Result) to structure your responses effectively.
✨Emphasise Team Collaboration
Collaboration is key in this role, so be sure to discuss your experience working in teams. Share examples of how you've contributed to team success, particularly in agile environments, and how you communicate effectively with both technical and non-technical stakeholders.
✨Familiarise Yourself with Their Tech Stack
Research the technologies mentioned in the job description, such as Spring Boot and Postgres. Being able to discuss how you've used these technologies in your past work will show that you're not only qualified but also genuinely interested in the role.
