Application Architect

The environment is cloud‑native and distributed, supporting varied workloads with strong security, reliability, and governance requirements.

What you'll be doing:

You'll contribute to and shape application architectures aligned with enterprise and solution‑level standards. Translating requirements into clear, pragmatic architectural designs - promoting consistency, reuse, and good design practices across application components

Applying and promoting architectural principles, security standards, and engineering best practices is a key part of the role. You will also review significant technical design decisions within the application scope, working collaboratively with engineering and solution architecture teams. Ensuring solutions meet required quality attributes including performance, resilience, scalability, and maintainability

You will act as a recognised technical point of reference for development teams. Collaborating with a range of stakeholders to evaluate design options and trade‑offs. You will influence technical decisions through expertise and clear communication rather than formal authority

Guide the design of cloud‑native, AWS‑hosted applications, considering resilience, security, operability, and cost. Ensure operational concerns such as observability, supportability, and deployment are considered early in design.

You will promote continuous improvements, by contributing to architectural roadmaps and the ongoing evolution of the platform; Validating architectural approaches where appropriate through lightweight proofs of concept and Supporting continuous improvement in architectural practices, patterns, and technical standards

What you'll bring:

Experience as an application architect or senior engineering role within distributed systems

Strong understanding of application design, API design, and data modelling.

Solid experience with Java and/or Python in production environments

Practical experience designing and operating AWS‑based applications in a cloud‑native environment

Working knowledge of containerised architectures, messaging patterns, and distributed data stores

Understanding of Infrastructure as Code concepts and modern CI/CD practices

Sound understanding of security, authentication, and authorisation concepts

Strong communication skills, with the ability to explain technical concepts clearly to both technical and non‑technical audiences

Ability to influence technical decisions and collaborate effectively across teams and cultures

Experience in designing solutions with good observability practices embedded

Understanding of performance, scalability, and resilience engineering

Deeper exposure to event‑driven architectures and asynchronous messaging at scale

Experience optimising performance, resilience, and cost in production cloud environments

Familiarity with modern front‑end architectures and integration patterns

Experience working in financial services, risk, compliance, or other regulated environments is desirable but not essential

The Person

A pragmatic and technically strong architectural thinker who collaborates effectively with both technical and business stakeholders. Comfortable navigating complex, fast‑moving environments, they influence through expertise rather than authority. You are curious, proactive, and focused on delivering high‑quality, sustainable systems.

Career Stage:

Manager

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.

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