Lead Software Engineer - Frontend SDK Development

London Stock Exchange Group; Bengaluru; On-site; INR 1,500,000 - 2,100,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

London Stock Exchange Group (LSEG) is seeking a Senior Lead Frontend Engineer to own a JavaScript SDK used by clients for secure authentication integration. You will design developer-friendly APIs, ensure security and performance, and work with backend teams to align with identity protocols.

The role emphasizes SDK design, secure frontend engineering, and automation; a Hybrid workplace arrangement is expected with collaborative cross-team work across Bengaluru, India.

Qualifications

• 10–15 years total IT experience.
• Frontend development with React and TypeScript.
• Experience designing/maintaining SDKs or libraries used by developers.
• Strong understanding of OAuth2 and OpenID Connect.

Responsibilities

• Own and maintain a JavaScript SDK built with React and TypeScript.
• Design intuitive, developer-friendly APIs for authentication flows.
• Ensure security, performance, and easy integration across frontend apps.
• Collaborate with backend engineers to align SDK with identity protocols.
• Build automated tests and CI pipelines to ensure quality and backward compatibility.
• Write clear documentation and sample apps for developers.
• Stay current with frontend security best practices and platform improvements.

Skills

React

TypeScript

OpenID Connect

OAuth2

SDK design

Security

CI/CD

Automated testing

Accessibility

Performance optimization

Job description

Senior Lead Software Engineer - Frontend Developer

ROLE PROFILE: We are seeking a Senior Lead Frontend Developer to join our Customers Identity & Access Management team at LSEG. You will play a pivotal role in maintaining and evolving our JavaScript SDK, a critical interface that enables secure authentication and seamless integration of our Authentication into client applications across to our customers. This role is ideal for someone who thrives in developer experience, SDK design, and security-focused frontend engineering.

What You’ll be doing:

• Own and maintain a JavaScript SDK built with React and TypeScript, enabling secure integration with our custom Secure Token Service.
• Design intuitive, developer-friendly APIs that abstract complex authentication flows (OAuth2, OpenID Connect).
• Ensure the SDK is secure, performant, and easy to integrate across a wide range of frontend applications.
• Collaborate with backend engineers to align SDK functionality with evolving identity protocols and token flows.
• Build automated tests and CI pipelines to ensure quality, reliability, and backward compatibility.
• Write clear documentation and sample apps to support internal and external developers.
• Stay current with frontend security best practices and contribute to platform-wide improvements.

What You'll bring:

• Professional should have 10 – 15 years of total IT experience.
• Proven of experience in frontend development, with deep expertise in React, TypeScript, and modern JavaScript.
• Proven experience designing and maintaining SDKs or libraries used by other developers.
• Strong understanding of OAuth2, OpenID Connect, and secure authentication flows.
• Familiarity with CI/CD pipelines, automated testing, and versioning strategies for SDKs.
• Experience with frontend performance optimization, cross-browser compatibility, and accessibility standards.
• Passion for clean code, automation, and continuous improvement.
• Excellent interpersonal skills and a passion for developer experience and security.

What you’ll get in return

• High-impact projects : We work on a variety of pioneering AI products and leverage extensive datasets to solve complex, high-value challenges.
• Competitive benefits : You will enjoy a strong compensation package, comprehensive benefits, and ongoing investment in career growth and skill development.
• Industry leadership : This is an opportunity to be a founding member of the organization that’s delivering brand-new products that democratize modeling and analytics solutions.
• Collaborative environment : 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 is considered ‘Blended’, which requires attending the office at least three day per week while some teams and colleagues choose to collaborate in the office more frequently.

We're proud to have been recognised as a Great Place to Work in India ‘25 Learn more about life and purpose of our company directly from India colleagues’ video: Bengaluru, India | Where We Work | LSEG Career Stage: Manager London Stock Exchange Group (LSEG) Information: Join us and be part of a team that values innovation, quality, and continuous improvement.

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.

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.

Experience Level Senior Level