Senior Full Stack Developer – Python & Cloud

About the Role:

We are looking for a seasoned Senior Full Stack Developer with deep expertise in Python and cloud-native application development. The ideal candidate is a hands-on engineer who can design scalable APIs, secure backend systems, build modern frontend interfaces, and deploy cloud-enabled solutions. If you thrive in fast-paced environments and are excited about integrating AI tools into development workflows, we want to talk to you.

Responsibilities:

• Architect and develop secure, scalable RESTful and GraphQL APIs using Python frameworks like FastAPI, Flask, or Django
• Implement design patterns for reusable, maintainable backend systems
• Design and optimize algorithms for processing, analytics, and data transformation
• Build responsive frontend applications using React.js, TypeScript, or modern frameworks
• Implement and maintain CI/CD pipelines and infrastructure as code using Azure or AWS
• Ensure application security with OAuth2, JWT, rate-limiting, and threat modeling
• Integrate AI-assisted development and code generation tools such as GitHub Copilot, OpenAI APIs, or custom LLMs
• Collaborate closely with product managers, designers, and DevOps to build production-grade software
• Write unit, integration, and performance tests to ensure code quality
• Mentor junior developers and conduct code/design reviews
  
  

Must-Have Skills:

• Strong Python development experience with deep understanding of language features and design patterns
• Proven experience in backend frameworks such as FastAPI, Flask, or Django
• Strong grasp of REST, WebSockets, API versioning, and documentation best practices
• Experience with frontend technologies like React, Next.js, or Vue.js
• Familiarity with SQL and NoSQL databases such as PostgreSQL, MySQL, MongoDB, or Redis
• Hands-on experience with cloud platforms (Azure or AWS) and containerization (Docker, Kubernetes)
• Proficiency in Git, GitHub Actions, Terraform, or other infrastructure as code tools
• Understanding of application security concepts: CORS, CSRF, authentication flows, rate-limiting
• Experience with using or integrating AI coding tools and APIs
• Good understanding of software architecture, microservices, and event-driven systems
  
  

Nice-to-Have Skills:

• Experience with GraphQL and API gateway technologies
• Familiarity with observability tools (Datadog, Prometheus, ELK stack)
• Knowledge of async programming, task queues (Celery, RQ), and distributed systems
• Experience building internal developer tools, portals, or CI/CD platforms
• Exposure to DevSecOps practices and secure software supply chain tooling
  
  

Soft Skills:

• Excellent problem-solving and debugging skills
• Strong communication and collaboration in cross-functional teams
• Passion for clean, readable, and well-documented code
• Self-driven, proactive, and able to work independently
  
  

Applies business requirements and knowledge of software development lifecycles to design, produce and guide the development of complex software solutions.

Role Responsibilities & Key Accountabilities:

• Demonstrates significant knowledge of a single or multiple technologies and advises on design, development and implementation
• Advances tools and applications by producing clean and efficient code and reviews others' code when required
• Handles own workload and promotes an inclusive and open culture
• Demonstrates depth of knowledge and expertise in software development and is regarded as the SME in their domain. Develops knowledge of other domains to understand linkages and dependencies
• Understands the tech strategy and culture, and how they impact own work as well as adjacent teams
• Oversees the design work and planning for user journeys ensuring the achieve the desired objectives
• Supports the creation of solutions for Epics and the associated implementation tasks
• Adapts existing patterns to develop robust solutions
• Develops understanding of LSEG's commercial direction and how technology is forming a part of this
• Completes the delivery of given tasks with some guidance and oversight
• Builds strong relationships with senior internal stakeholders, growing network and collaborating with own team and colleagues in other domains. Communicates complex information clearly to relevant audiences
• Takes initiative to develop knowledge in technology products and tools through on the job learning, certifications and projects.
  
  

Qualifications & Experience:

• Professional qualification or equivalent
• Significant knowledge of at least one programming language
• Moderate experience in a Software development and delivery role
• Moderate experience of multiple development technologies and knowledge of when patterns are appropriate and solutions are anti-patterns
• Some experience of Business and Technical Analysis, Quality Assurance, delivery management, and / or Emerging Technology and Governance
• Some stakeholder management experience.
  
  

Benefits

We are looking for intellectually curious people, passionate about the bigger picture of how technology industry is evolving, ready to ask difficult questions and deal with complicated scenarios! If you are creative and a problem solver, this is the place to be as will be supporting you to fast-forward your career!

We enhance each employee’s potential through personal development through a wide range of learning tools both formal and informal.

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. You will be part of a collaborative and creative culture where we encourage new ideas and are committed to sustainability across our global business. You will experience the critical role we have in helping to re-engineer the financial ecosystem to support and drive sustainable economic growth. Together, we are aiming to achieve this growth by accelerating the just transition to net zero, enabling growth of the green economy and creating inclusive economic opportunity.

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

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.

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.