Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Build innovative backend systems that empower financial freedom and transform money management.
- Company: Join a forward-thinking fintech company focused on financial inclusion.
- Benefits: Competitive salary, stock options, performance bonuses, and paid annual leave.
- Why this job: Make a real impact in a fast-growing company using the latest technology.
- Qualifications: 5+ years of software engineering experience, primarily with Python, and strong communication skills.
- Other info: Collaborative team environment with opportunities for skill development and career growth.
The predicted salary is between 36000 - 60000 £ 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 Senior 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
- You will be responsible for building agentic infrastructure that will power our operations - you will build customer support bots and fincrime AI agents that will redefine how fintech operations are done.
- You will follow 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
- 5+ years of experience working as a software engineer with 3+ years of engineering with Python as your primary language.
- Experience working with Postgres (or other relational) database.
- An academic background in STEM.
- Quick learner with an ambitious and results driven personality, with excellent communication skills (English fluency, verbal and written).
- Willingness to work from the London office at least 1 day per week.
Nice to have
- Experience with LangChain & LangGraph.
- Experience with LLM APIs (OpenAI, Google or Anthropic).
- Experience with AWS, K8s, Gitlab, monitoring, and alerting.
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.
Senior Software Engineer, Python in London employer: Castleisland
Contact Detail:
Castleisland Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Software Engineer, Python in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the fintech space and let them know you're on the lookout for opportunities. A personal recommendation can go a long way in landing that dream job.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your projects, especially those involving Python and backend systems. This is your chance to demonstrate your expertise and passion for building robust solutions.
✨Tip Number 3
Prepare for interviews by brushing up on your technical knowledge and problem-solving skills. Practice coding challenges and be ready to discuss your past experiences with TDD, DDD, and continuous integration.
✨Tip Number 4
Don't forget to apply through our website! It’s the best way to ensure your application gets noticed. Plus, we love seeing candidates who are proactive about joining our mission for financial freedom.
We think you need these skills to ace Senior Software Engineer, Python in London
Some tips for your application 🫡
Tailor Your CV: Make sure your CV highlights your experience with Python and backend systems. We want to see how your skills align with our mission of empowering financial freedom, so don’t hold back on showcasing relevant projects!
Craft a Compelling Cover Letter: Your cover letter is your chance to shine! Tell us why you’re excited about the role and how you can contribute to building robust systems. Keep it conversational but professional – we love a bit of personality!
Showcase Your Problem-Solving Skills: In your application, give examples of complex challenges you've tackled in the past. We’re looking for someone who thrives on solving problems, so share those experiences that demonstrate your innovative thinking.
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’re considered for the role. Plus, it’s super easy – just a few clicks and you’re done!
How to prepare for a job interview at Castleisland
✨Know Your Tech Stack
Make sure you’re well-versed in Python and any other technologies mentioned in the job description, like Postgres and AWS. Brush up on your knowledge of TDD and DDD principles, as these will likely come up during technical discussions.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in previous roles and how you tackled them. Think about examples where you built scalable systems or improved existing processes, as this aligns with their focus on financial inclusion and innovative solutions.
✨Communicate Clearly
Since excellent communication skills are a must, practice explaining complex technical concepts in simple terms. This will not only demonstrate your expertise but also show that you can collaborate effectively with non-technical team members.
✨Cultural Fit Matters
Research the company’s vision and values. Be ready to discuss how your personal goals align with their mission of empowering financial freedom. Showing enthusiasm for their vision can set you apart from other candidates.
