Senior Python Developer | Series B Fintech | Flexible Working |

Senior Backend Engineer (Python / Distributed Systems)

London / Hybrid

We’re partnering with a high-growth fintech building critical infrastructure for institutional financial markets.

Their platform processes billions in daily transaction volume and sits at the heart of complex investment workflows used by sophisticated institutional clients.

This is an opportunity to join a lean, high-calibre engineering team where you’ll work closely with senior technical leadership to design, build and scale mission-critical backend systems.

If you enjoy solving complex technical problems in environments where engineering quality, reliability and ownership genuinely matter, this could be a strong fit.

The Role

You’ll be responsible for designing and developing backend systems that support core trading / investment operations, internal workflows, and client-facing products.

This is a hands-on senior engineering role with meaningful ownership and direct impact.

Responsibilities include:

• Designing and building scalable backend services and distributed systems
• Developing high-quality, maintainable production code
• Working on mission-critical applications with high reliability requirements
• Building APIs and backend integrations
• Contributing to system architecture and technical design decisions
• Improving performance, scalability and observability
• Participating in code reviews and engineering best practices
• Mentoring less experienced engineers where appropriate
• Collaborating with product, engineering leadership and stakeholders

Tech Environment

• Python
• AWS
• Docker / Kubernetes
• REST APIs / GraphQL
• CI/CD
• Infrastructure as Code

Engineers with strong experience in other backend OO languages (Go, Java, C#, C++) are also encouraged to apply.

What We’re Looking For

• 5+ years building complex backend applications
• Strong backend engineering fundamentals
• Experience with distributed systems / scalable infrastructure
• Production experience with cloud platforms (AWS preferred)
• Experience with APIs, databases, and modern software engineering practices
• Strong understanding of testing, CI/CD, and code quality
• Excellent problem-solving and communication skills
• Strong STEM academic background (Computer Science, Engineering, Physics, Mathematics or similar) *REQUIRED*

Highly desirable:

• Fintech / financial systems experience
• Python expertise
• PostgreSQL
• Messaging architectures
• Containerisation / orchestration
• Infrastructure tooling
• Experience working in lean, high-ownership engineering teams

Compensation

• Base salary up to £90,000
• Guaranteed annual bonus (10–30% - OTE £117,000)
• Meaningful equity
• Strong wider benefits package

Location

Hybrid London working model with flexibility.

This role unfortunately does not offer sponsorship.