Python Developer

lloyds banking group; Cardiff; On-site; GBP 65,000 - 73,000; Full time

Job summary

A major UK financial institution is seeking an experienced Python Developer to join their Retail Finance Change team. In this role, you will lead the development of Python models and tools that drive automation and financial modelling. You will collaborate with analysts and domain experts, ensuring the delivery of robust and scalable solutions. Ideal candidates will have a passion for innovation, a strong foundation in Python development, and experience with financial models. This position offers flexible working arrangements and a comprehensive benefits package.

Benefits

Generous pension contribution

Annual performance-related bonus

30 days’ holiday plus bank holidays

Qualifications

• Proven track record of Python model development.
• Ability to develop complex financial models optimized for performance.
• Excellent communication and presentation skills.

Responsibilities

• Take ownership of the full delivery lifecycle of Python financial models and automation tools.
• Work closely with Business Analysts to translate business needs into solutions.
• Develop performant financial models optimized for large datasets.

Skills

Python model development

Core software development principles

Complex financial models

Excellent communication skills

Team collaboration

Tools

Git

pytest

Flake8

Job description

End Date

Monday 09 February 2026

Salary Range

£65,385 - £72,650

We support flexible working – click here for more information on flexible working options

We support flexible working – click here for more information on flexible working options

Flexible Working Options

Flexibility in when hours are worked, Hybrid Working, Job Share

Job Description Summary

Join us as a Python Developer and help drive automation and financial modelling that transforms Retail Finance. You’ll lead end to end delivery of high performance Python models and tools, turning complex business needs into clean, user friendly solutions. Working with analysts and domain experts, you’ll ship robust, scalable code and deployable artefacts that make a real impact. You’ll shape our technical direction, contribute to design forums and code reviews, and mentor a Junior Developer along the way. If you love innovation, big datasets, and building the future of finance, this role puts you right at the centre of it!

Job Description

Key Details

JOB TITLE: Python Developer

SALARY: as per pay range

LOCATION: Leeds, Wellington Place

ADDITIONAL LOCATION(S): Halifax, Bristol, Cardiff, Newport

HOURS: Full Time, 35 hours per week

WORKING PATTERN: Our work style is hybrid, which involves spending at least two days per week, or 40% of our time, at one of our office sites

About this Opportunity

Do you have a passion for developing Python applications, driving innovation and automation? Do you have experience building financial models? If so, we're eager to meet you!

We’re looking for a dedicated Python Developer to join our Retail Finance Change team and drive real, business-critical transformation—delivering ground breaking financial solutions. You’ll bring curiosity, analytical thinking, and a passion for change as we tackle a strategic backlog of development and optimisation.

Why Lloyds Banking Group

We’re on an exciting journey to transform our Group and the way we’re shaping finance for good. We’re focusing on the future, investing in our technologies, workplaces, and colleagues to make our Group a great place for everyone. Including you.

Day to day responsibilities

Take ownership of the full delivery lifecycle of Python financial models and automation tools, including design, build, testing, packaging, release, and ongoing support.

Work closely with Business Analysts and domain experts to translate business needs into technical solutions.

Develop performant financial models and automation tools, optimised for use with large datasets.

Develop user-friendly UIs for model execution and reporting using modern frameworks.

Package and distribute models as deployable artefacts, ensuring reproducibility and dependency management.

Ensure code quality and maintainability with thorough unit, integration and system tests.

Actively participate in design forums and peer code reviews, providing and responding positively to constructive feedback.

Provide mentorship and line management for a Junior Python developer.

Share your Python expertise through collaborative learning sessions with members of the team.

Support the design and implementation of robust operating models.

Leverage your expertise to help shape our technical future; ensure we use the best tools and infrastructure available to us.

What you’ll need

• Proven track record of Python model development and implementation.
• Understanding of core software development principles.
• Ability to develop complex financial models, optimise for performance and handle large datasets efficiently.
• Experience with common Python tooling and best practices, including:
  • Virtual environments.
  • Package management (e.g. uv, pip, poetry).
  • Source control (e.g., Git/GitHub) for collaborative development.
  • CI/CD pipelines for automated testing and deployment.
  • Testing frameworks (e.g. pytest, unittest).
  • Code quality (e.g. flake8, black, myp, ruff).
• Documentation tools (e.g., MkDocs, Sphinx) for maintainable technical documentation.
• Excellent communication and presentation skills.
• Passion for learning and staying ahead of the curve.

And any experience of these would be really useful

• Experience with front-end technologies e.g. React.
• Experience with data processing and validation libraries (Polars, Pandera), numerical computing (NumPy, Numba), and API frameworks (FastAPI).

About working for us

Our ambition is to be the leading UK business for diversity, equity and inclusion supporting our customers, colleagues and communities and we’re committed to creating an environment in which everyone can thrive, learn and develop.

We were one of the first major organisations to set goals on diversity in senior roles, create a menopause health package, and a dedicated Working with Cancer Initiative.

We offer reasonable workplace adjustments for colleagues with disabilities, including flexibility in office attendance, location and working patterns. And, as a Disability Confident Leader, we guarantee interviews for a fair and proportionate number of applicants who meet the minimum criteria for the role with a disability, long-term health or neurodivergent condition through the Disability Confident Scheme.

We provide reasonable adjustments throughout the recruitment process to reduce or remove barriers. Just let us know what you need.

We also offer a wide-ranging benefits package, which includes:

• A generous pension contribution of up to 15%
• An annual performance-related bonus
• Share schemes including free shares
• Benefits you can adapt to your lifestyle such as discounted shopping
• 30 days’ holiday, with bank holidays on top
• A range of wellbeing initiatives and generous parental leave policies

Want to do amazing work, that’s interesting and makes a difference to millions of people? Join our journey.

At Lloyds Banking Group, we're driven by a clear purpose; to help Britain prosper. Across the Group, our colleagues are focused on making a difference to customers, businesses and communities. With us you'll have a key role to play in shaping the financial services of the future, whilst the scale and reach of our Group means you'll have many opportunities to learn, grow and develop.

We keep your data safe. So, we'll only ever ask you to provide confidential or sensitive information once you have formally been invited along to an interview or accepted a verbal offer to join us which is when we run our background checks. We'll always explain what we need and why, with any request coming from a trusted Lloyds Banking Group person.

We're focused on creating a values-led culture and are committed to building a workforce which reflects the diversity of the customers and communities we serve. Together we’re building a truly inclusive workplace where all of our colleagues have the opportunity to make a real difference.