Principal Software Engineer (Python)

London Stock Exchange Group; City Of London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading financial institution in London is looking for an experienced software engineer who excels in strategic thinking and problem-solving to design scalable software products. The ideal candidate will possess expert-level Python skills and significant experience with cloud technologies, particularly Azure. You will be collaborating closely with Data Science and product teams to ensure project goals are met. The role offers competitive benefits, opportunities for career growth, and a flexible hybrid work environment.

Benefits

Market leading compensation package

Ongoing investment in career growth

Healthcare and retirement planning

Paid volunteering days

Wellbeing initiatives

Qualifications

• Expert-level Python skills required.
• Experience in designing and implementing scalable systems.
• Effective communication with technical and non-technical colleagues.

Responsibilities

• Design and develop scalable software products.
• Solve complex technical issues and optimize workflows.
• Collaborate closely with Data Science and product teams.

Skills

Python

Software engineering

Cloud technologies (Azure)

DevOps

Communication skills

Fintech experience

Education

Degree in Engineering, Computer Science, Data Science, Statistics, Mathematics, Physics or related field

Tools

CI/CD pipelines

Automated testing

Job description

You will combine strategic thinking, strong problem-solving skills, and a collaborative approach to ensure your team successfully ships great products.

Responsibilities

• Design and development of scalable software products.
• Solve complex technical issues, optimize workflows, and provide strategic insights to partners to support project goals and timelines.
• Collaborate closely with Data Science, research and product teams.

Qualifications

• Expert‑level Python skills.
• Extensive experience in software engineering with a focus on designing and implementing high‑performance, scalable systems.
• Experience working cross‑functionally with Product and Research teams.
• Experience in cloud technologies (emphasis on Azure) and deployment practices, ensuring seamless and scalable delivery.
• Experience working with ML and Data Science teams and productionizing ML solutions.
• Proven ability to uphold coding and design standards to ensure high‑quality, maintainable code.
• Effective communication skills, with experience communicating with both technical and non‑technical colleagues.
• Working knowledge of DevOps, including CI/CD pipelines, automated testing, and monitoring.
• Experience in Fintech is a plus.
• Education‐degree in Engineering, Computer Science, Data Science, Statistics, Mathematics, Physics or related field, or equivalent work experience.

Company Overview

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.

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.

Privacy Notice: 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.

Benefits

• Competitive benefits: We offer a market leading compensation package, great benefits, and ongoing investment in career growth and skill development.
• Industry leadership: We deliver brand-new products that democratize modeling and analytics solutions.
• Career progression: We are a growing organization and we provide opportunities for continuous learning and development.
• 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 is considered ‘digital first’, which requires attending the office at least one day per week while some teams and colleagues choose to collaborate in the office more frequently.
• LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.