Senior Python Developer

Role profile

Build the platforms that help shape how AI-assisted applications are evaluated across our organisation.

We're looking for a Lead Software Engineer to design and develop scalable software solutions that enable the testing, evaluation, and continuous improvement of AI-powered products. Working at the intersection of software engineering, data science, and AI, you'll help create the technical foundations that support reliable, data-driven decision making across the organisation.

Role summary

Our Lead Software Engineers are hands-on technical leaders who design, build, and evolve scalable software systems while providing technical leadership within their area of expertise.

In this role, you'll work closely with software engineers and data scientists to develop platforms, services, and tooling that support AI application evaluation. You'll contribute across the software lifecycle, from solution design and architecture through implementation, deployment, and operation, while helping establish engineering standards that promote quality, maintainability, and the responsible use of AI.

You'll combine strong software engineering fundamentals, practical cloud experience, and a collaborative approach to deliver solutions that have impact across multiple teams.

What you'll be doing:

• Design, develop, and maintain scalable software solutions and services, primarily in Python, which measure the quality, reliability, performance, and safety of AI-assisted applications.
• Build reusable platforms, frameworks, and tooling that enable teams across the organisation to evaluate AI-assisted applications consistently and efficiently.
• Partner closely with data scientists and engineers to understand evaluation methodologies, translate requirements into technical solutions, and enable data-driven insights.
• Support deployment and operational activities within Azure, collaborating with DevOps and platform teams where appropriate.
• Own the technical direction, promote engineering best practices, mentor colleagues, and help raise technical standards across the team.
• Leverage AI-assisted development tools responsibly and effectively to improve productivity, software quality, and delivery outcomes.

What you'll bring:

• Strong professional experience developing production software, with significant experience in Python.
• Experience designing and delivering robust, scalable systems and services in cloud environments.
• Strong understanding of software engineering principles, including code quality, maintainability, security, and operational excellence.
• Experience influencing technical direction, driving engineering improvements, or mentoring other engineers.
• Experience building platforms, frameworks, or shared services that support multiple users or teams.
• Curiosity about AI technologies and a commitment to using AI tools responsibly and effectively within the software development lifecycle.

Desirable

• Practical knowledge of DevOps practices, including CI/CD pipelines, automated testing, source control workflows, and application monitoring.
• Experience working with cloud platforms, ideally Azure, including deploying and operating applications and services.

What you’ll get in return:

• High-impact projects: We work on a variety of core projects pioneering AI products across the organisation.
• Competitive benefits: We offer a strong compensation package, comprehensive benefits, and ongoing investment in career growth and skill development.
• Industry leadership: We deliver brand-new AI-products that democratize financial analytics solutions.
• Career progression: We provide opportunities for continuous learning and professional development in a work environment of dedicated, highly experienced teams.

We recognize that to attract the best talent, we need to be flexible, and we are open to discussing work arrangements with you. We take a hybrid approach to the workplace; this role will require attending the office at least three days per week.

Career Stage:

London Stock Exchange Group (LSEG) Information:

Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.

Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.

Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it’s used for, and how it’s obtained, your rights and how to contact us as a data subject.

If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.