Python Developer

November 3, 2026

Senior

London Area, United Kingdom

Description

We're hiring an experienced Python Software Engineer to join a highly technical engineering team at a technology-driven financial firm operating across global markets. The role covers the design, development and optimisation of scalable backend applications, microservices and distributed systems in complex, data-intensive environments. The work combines greenfield projects with existing systems and offers significant technical ownership alongside accomplished engineers.

Responsibilities

Design, develop and maintain robust, production-grade Python applications
Build scalable backend services, microservices and distributed systems
Develop sophisticated software solutions capable of processing large volumes of complex financial information
Contribute to greenfield development projects, designing and implementing new applications and services
Optimise existing systems for performance, scalability, reliability and efficiency
Solve complex engineering challenges involving system architecture, concurrency and application performance
Collaborate with experienced software engineers and financial specialists to deliver sophisticated technical solutions
Participate in architectural discussions, code reviews and technical decision-making
Contribute to engineering best practices and the ongoing improvement of development processes

Requirements

4+ years of professional software engineering experience
Strong commercial Python experience, particularly within backend or systems development
Experience within investment banking, hedge funds, asset management, fintech or similarly demanding technical environments
Strong understanding of software engineering principles, algorithms, data structures and object-oriented programming
Proven experience designing, developing and maintaining production-grade software applications
Experience working with distributed systems, microservices or scalable backend architectures
Strong problem-solving skills and the ability to tackle complex technical challenges
Strong academic background in Computer Science, Mathematics, Engineering or a related discipline
Strong SQL skills and experience working with relational databases
Experience optimising performance-critical applications
Experience with distributed computing, concurrency or multithreaded applications
Knowledge of event-driven architectures and messaging technologies such as Kafka
Experience designing APIs and developing service-oriented architectures
Familiarity with Docker, Kubernetes and modern deployment environments
Exposure to financial markets, trading systems, risk management or quantitative environments

Conditions

Full-time employment at a technology-driven financial firm
Total compensation up to £200,000 including base salary and discretionary bonus
Opportunity to work alongside highly accomplished software engineers
Exposure to sophisticated technology and complex engineering challenges
Significant opportunities for technical development and career progression
Involvement in impactful projects within a highly successful financial technology environment