Senior Python Developer (C602DE0)

Referment; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Job summary

Referment is seeking a Senior Python Developer to own and drive critical components of a regulated fintech platform in a hybrid London setting. You’ll mentor junior engineers, guide architectural decisions and collaborate with cross-functional teams to translate business needs into robust software.

You will take responsibility for delivering scalable, secure solutions, leading code reviews, testing and production troubleshooting while promoting best practices and thorough documentation.

Qualifications

• 8+ years of professional software development experience, with at least 4 years using Python as a core language.
• Proven ability to deliver scalable, high-quality solutions in production environments.
• Experience mentoring and guiding developers with strong technical leadership.
• Deep understanding of version control, testing, CI and agile methodologies.
• Strong communication skills and ability to align technical and non-technical teams.

Responsibilities

• Own key components and features, ensuring they’re scalable, secure and performant.
• Provide technical guidance and mentorship to junior and mid-level developers.
• Collaborate with operations, investments, client services, sales and finance to translate requirements into tech solutions.
• Drive code reviews, testing, and best practices; lead production issue resolution.
• Deliver high-quality solutions on time; contribute to documentation and knowledge sharing.
• Maintain clear release workflows and ensure code quality across the team.

Skills

Python

Leadership

Mentoring

CI/CD

Testing

Agile

Communication

Version control

Education

Master's degree

Tools

Git

Docker

Jenkins

Job description

Referment is working with a UK wealth technology company whose platform is used by financial advice firms to manage portfolios, custody, execution and reporting for their clients. Everything on the platform is built by an in-house engineering team, and the business operates in a regulated financial services environment where reliability and security genuinely matter.

It's now looking for a Senior Python Developer to play a critical role in designing, developing and optimising the platform. This is very much a hands-on engineering role with a leadership dimension: you'll drive the technical execution of projects, mentor other developers, and work closely with non-technical teams to turn business requirements into working software.

The Role

You’ll take ownership of key components and features, ensuring they remain scalable, secure and performant. Alongside your own delivery, you’ll provide technical guidance and mentorship to junior and mid-level developers, helping them grow their technical skills and understanding of system architecture.

Much of the role is collaborative. You’ll work closely with teams across operations, investments, client services, sales and finance to understand business requirements and translate them into technical solutions, making sure implementations align with both business goals and technical standards.

You’ll be accountable for the quality of what ships — driving code reviews, testing and best practices, and leading the investigation and resolution of production issues and performance bottlenecks. You’ll deliver high-quality solutions on time, contribute to documentation and knowledge sharing, and keep the development and release workflow clear and consistent.

What We’re Looking For

• At least 8 years of professional software development experience, including a minimum of 4 years using Python as a core programming language
• A proven track record of delivering scalable, high-quality solutions in production environments
• Experience mentoring and guiding developers, with strong technical leadership skills
• A deep understanding of version control, testing, continuous integration and agile methodologies
• Strong communication skills and the ability to engage both technical and non-technical teams, keeping everyone aligned
• A relevant Master’s degree

Also Valuable

• Proficiency in a second programming language such as C++ or Java
• Experience in financial services or another highly regulated environment

This is a permanent, hybrid role, with three days a week based in the central London office. The company is unable to offer visa sponsorship for this position.

This Could Suit

A senior backend engineer who wants to stay close to the code while taking real ownership of architecture, quality and mentoring — particularly if your background is in fintech or another regulated, product-led technology business.

#Referment