Lead Software Engineer

Lead Software Engineer

The Lead Software Engineer is a technical leader with solid hands-on expertise in React and Node.js (NestJS). This role drives the design and delivery of complex, business-critical systems while mentoring engineers, shaping engineering standards, and fostering a high-performing, inclusive culture. The Lead Software Engineer partners closely with engineering management, product, and senior stakeholders to ensure technology decisions align with long-term organizational and commercial goals.

Role Responsibilities & Key Accountabilities

Technical Leadership

• Lead the technical design and evolution of large-scale, full-stack systems using React, Node.js (NestJS), ensuring solutions are scalable, secure, and maintainable.
• Act as a technical authority across teams, setting standards for architecture, code quality, testing, and engineering best practices.
• Drive consistency and reuse by defining and evolving shared patterns, libraries, and frameworks.
• Review and influence technical designs across multiple teams, identifying risks, trade-offs, and opportunities for improvement.
• Translate business strategy and product roadmaps into clear technical direction and execution plans.
• Oversee the breakdown of complex Epics into well-defined technical solutions and delivery plans.
• Mentor and coach engineers at multiple levels, supporting their technical growth.
• Lead by example through hands-on development, code reviews, and collaborative problem solving.
• Foster an inclusive, psychologically safe environment that encourages knowledge sharing, ownership, and continuous improvement.

Collaboration & Stakeholder Engagement

• Partner closely with Engineering Managers, Product Managers, Designers, and Architecture teams to align delivery with business outcomes.
• Build strong relationships with senior internal stakeholders, clearly communicating complex technical concepts, risks, and trade-offs.
• Act as a bridge between teams to improve collaboration, reduce dependencies, and improve overall delivery effectiveness.

Delivery & Execution

• Take ownership of critical initiatives, ensuring timely and high-quality delivery with minimal oversight.
• Identify and proactively address technical debt, system risks, and scaling challenges.
• Continuously evaluate emerging technologies, tools, and practices, driving their adoption where they add clear value.

Qualifications & Experience

• Degree in Computer Science, Software Engineering, or equivalent practical experience.
• Extensive professional experience with JavaScript/TypeScript, including:
• React (advanced patterns, performance optimization, state management)
• Node.js (NestJS) (API design, modular architecture, security, scalability)
• Strong experience leading technical design and influencing architecture across multiple teams or systems.
• Proven experience mentoring engineers
• Deep understanding of software development lifecycles, agile delivery, and modern engineering practices.
• Strong judgment in applying design patterns and recognizing anti-patterns in complex systems.
• Working knowledge of cloud platforms, CI/CD pipelines, observability, and DevOps practices.
• Experience in regulated or large-scale enterprise environments is a plus.

Career Stage: Senior Associate

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.