Lead Frontend Developer- React

The Team

Join our innovative team at S&P Global as we embark on a transformative journey to enhance Kensho Spark Assist, our internal conversational AI platform. This platform is designed to support colleagues across all departments, promoting collaboration and efficiency. Our team operates in a dynamic, agile environment, focusing on creating scalable systems that deliver real value while prioritizing stakeholder needs through data-informed decisions and continuous improvement.

About the Role

As a Lead Frontend Engineer specializing in React and TypeScript, you will take on a pivotal role in shaping the future of our web applications and browser extensions. This position requires deep technical expertise in modern frontend technologies, a strong focus on delivering high-quality, performant, and accessible user experiences, and the ability to lead and mentor a team of frontend engineers. You will be responsible for driving technical excellence, contributing to architectural decisions, and ensuring best practices in a fast-paced, agile environment.

Impact

In this role, you will lead the development of cutting-edge generative AI solutions that serve a global workforce of over 30,000 employees at S&P Global. You will have the opportunity to influence the architectural direction of our applications, enhance user experiences, and promote the adoption of generative AI technologies across various roles within the company.

Whats in it for You

• Career Advancement: Build a meaningful career with a leading global company at the forefront of technology.
• Dynamic Work Environment: Engage in a fast-paced and innovative environment, contributing directly to impactful solutions.
• Skill Enhancement: Elevate your software development skills on an enterprise-level platform.
• Leadership Opportunities: Mentor and lead a team of frontend engineers, fostering a culture of collaboration and innovation.
• Work Flexibility: Enjoy a flexible work arrangement that balances office time with remote work options.
• Community Engagement: Benefit from five paid days for charity work or volunteering, supporting your passion for community service.

Key Responsibilities

Architecture & Delivery

• Define and evolve frontend architecture, including module boundaries, component architecture, state/data flow, performance and accessibility, lazy loading, error handling, observability, etc.
• Lead the implementation of key frontend features and ensure resilience for streaming and large payload rendering.
• Drive the abstraction of reusable components and ensure best practices in code quality.

Technical Leadership

• Set coding standards and ensure discipline in code quality practices.
• Mentor engineers through design reviews, detailed code reviews, pairing, and measurable growth plans.
• Champion accessibility standards and ensure compliance with best practices.

Quality & Testing

• Mature the testing strategy, implementing unit tests, integration tests, and end-to-end tests.
• Introduce automation for visual regression and accessibility testing.
• Enforce type safety and eliminate dead code, raising coverage on critical surfaces.

Security & Compliance

• Collaborate on security measures, ensuring safe handling of user data and compliance with best practices.
• Define secure patterns for file handling and API integrations.

Data & Observability

• Capture user interactions and performance metrics.
• Use metrics to prioritize refactors and ensure system reliability.

Collaboration & Process

• Drive cross-team initiatives and contribute to shared code repositories.
• Guide migration or consolidation efforts to ensure a cohesive design system.

Innovation

• Evaluate and implement emerging frontend patterns and technologies.
• Optimize user experiences based on feedback and performance data.

Our fast-moving inner-source environment encompasses multiple repositories, including a web application and browser extension, utilizing technologies such as React 18, TypeScript, Vite, Ant Design, XYFlow (graph/canvas), Chart.js, Mermaid, motion-based UI, React Router v7, Vitest, Testing Library, ESLint/Prettier, and secure enterprise integrations (Okta, internal APIs, etc). Our focus is on scalable UI architecture, performance streaming chat UX, accessibility, data visualization, and safe multi-model LLM interactions (OpenAI, Anthropic, Gemini, internal services, MCP).

Required Qualifications

• 8+ years of professional frontend experience, with at least 3 years in a leadership or mentoring role.
• Expertise in React and TypeScript, including typing, performance profiling, and context, reducer, hooks architecture.
• Strong experience with modern build tooling (e.g., Vite, ES modules, tree-shaking).
• Experience with complex state and data orchestration, including context management.
• Understanding of secure frontend patterns and REST API integration.

Preferred Qualifications

• Testing expertise, including unit and integration testing frameworks.
• Previous experience with XYFlow or building Canvas visualized graph-based projects
• Strong focus on accessibility and performance optimization.
• Familiarity with Ant Design, design library customization strategies, design token systems and theming.

Nice to Have

• Experience with React Native or cross-platform component strategies.
• Knowledge of data visualization libraries and rendering pipelines.
• Experience with browser extensions and their architecture.

Education

• Bachelors degree in Computer Science or equivalent experience (an advanced degree is a plus).

Core Behaviors

• Outcome and metrics-driven with autonomous prioritization.
• A mentorship mindset that elevates peers.
• A bias for incremental delivery with architectural foresight.
• Clear and candid communication.