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- Tasks: Design and scale backend systems for a cutting-edge AI fintech platform.
- Company: Fast-growing Series A AI fintech company in London.
- Benefits: Competitive salary up to £270k, equity, and hybrid work options.
- Other info: Opportunity to work closely with CTO and lead engineering initiatives.
- Why this job: Join a mission-critical team and make a real impact on financial technology.
- Qualifications: 8+ years in backend systems, strong Python and cloud experience required.
I’m working on a really interesting platform scaling hire for a fast-growing Series A AI/fintech company in London. They’ve built a product that processes millions of sensitive financial documents for lenders, brokers, insurers and fintechs across the US and UK. The platform is already mission-critical for customers — but rapid growth means the backend now needs to evolve from “built for speed” to “built for scale.” This role will work closely with the CTO and Head of Engineering and take real ownership of the core backend systems.
Key challenges include:
- Designing backend abstractions so a small engineering team can ship quickly and safely
- Scaling multi-tenant infrastructure across enterprise customers with different security and SLA requirements
- Supporting high-throughput document processing and ML pipelines
- Strengthening security, reliability and compliance around sensitive financial data
- Scaling systems from millions → tens of millions of documents
Ideal background:
- ~8+ years building and scaling backend systems
- Experience in high-growth B2B SaaS environments (Series A → C)
- Strong Python + cloud infrastructure experience
- Experience working with large volumes of regulated or sensitive data
- Hands-on IC mindset — someone who enjoys architecting and building
- A strong background in Computer Science, with a university degree from a top ranked Global University is essential
London (hybrid) £190k – £270k + equity
Principal Software Engineer - Up to £270k - Series A - AI FinTech Scale-Up in London employer: Oliver Bernard
Contact Detail:
Oliver Bernard Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Principal Software Engineer - Up to £270k - Series A - AI FinTech Scale-Up in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the tech industry, especially those who might know someone at the company you're eyeing. A personal introduction can make all the difference in getting your foot in the door.
✨Tip Number 2
Show off your skills! If you have a portfolio or GitHub with projects that highlight your Python and cloud infrastructure expertise, make sure to share it. This is your chance to demonstrate your hands-on IC mindset and how you can architect and build solutions.
✨Tip Number 3
Prepare for the interview by understanding the company's product and challenges. Dive deep into their platform and think about how you can contribute to scaling their backend systems. Tailor your answers to show you’re ready to tackle their specific needs.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love seeing candidates who take that extra step to engage with us directly.
We think you need these skills to ace Principal Software Engineer - Up to £270k - Series A - AI FinTech Scale-Up in London
Some tips for your application 🫡
Tailor Your CV: Make sure your CV is tailored to the role. Highlight your experience with Python and cloud infrastructure, as well as any work you've done in high-growth B2B SaaS environments. We want to see how your background aligns with our needs!
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 you can contribute to scaling our backend systems. Be genuine and let your passion for AI and fintech come through.
Showcase Relevant Projects: If you've worked on projects that involved scaling backend systems or handling sensitive data, make sure to mention them. We love seeing real-world examples of your skills in action, so don’t hold back!
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 shows you’re keen on joining our team!
How to prepare for a job interview at Oliver Bernard
✨Know Your Tech Inside Out
Make sure you’re well-versed in Python and AWS, as these are crucial for the role. Brush up on your knowledge of backend systems and be ready to discuss how you've scaled similar systems in the past.
✨Showcase Your Problem-Solving Skills
Prepare to tackle hypothetical scenarios related to scaling multi-tenant infrastructure or processing high volumes of sensitive data. Think through your approach and be ready to explain your thought process clearly.
✨Demonstrate Ownership and Leadership
This role involves taking ownership of core backend systems, so share examples from your experience where you led projects or made significant architectural decisions. Highlight your hands-on mindset and how you enjoy building solutions.
✨Understand the Company’s Mission
Familiarise yourself with the company’s product and its impact on the fintech landscape. Be prepared to discuss how your skills can contribute to their mission of processing sensitive financial documents efficiently and securely.