Sagar Kumar Singh - Senior Associate/Frontend Engineer - National Australia Bank (NAB)

Summary

Results-driven Frontend Developer experienced in building large-scale, customer-facing applications using React and TypeScript for banking and financial services. Achieved high-performance, accessible interfaces through expertise in architecting modular UI components, integrating GraphQL data layers, and managing application state with Redux Toolkit. Focused on leveraging AI-assisted development tools within Agile workflows to enhance team efficiency and consistency from technical design to deployment.

Overview

3

years of professional experience

Work History

Senior Associate/Frontend Engineer

National Australia Bank (NAB)

Gurgaon

08.2023 - Current

Developed and maintained a React and TypeScript-based banking miniapp within NAB's digital platform, serving millions of retail and business banking customers across web and mobile channels.
Designed and implemented GraphQL queries and mutations using Apollo Client to enable efficient, real-time data retrieval and updates between the frontend and the BFF service.
Managed application state using Redux Toolkit, React hooks and custom hooks to ensure predictable data flow across complex, multi-step user journeys.
Styled components using styled-components and NAB's proprietary design system, ensuring consistentUI/UX aligned with brand guidelines and design standards.
Attained and sustained over 90% unit test coverage utilizing Jest and React Testing Library while implementing accessibility testing through Jest-Axe, contributing to zero-bug, zero-vulnerability SonarQube quality gate
Owned end-to-end feature delivery - from requirement analysis and technical design through implementation, testing, and deployment - within Agile (Scrum) sprints.
Utilized CI/CD pipelines (Harness, Jenkins) for automated builds, testing, and deployments, and leveraged Splunk for application monitoring and log analysis.
Leveraged Cursor AI for AI-assisted development (code generation, refactoring, debugging, and test scaffolding) and delivered a PoC for a new feature by parsing Markdown-based requirements and using MCP servers for UI tooling integration — accelerating delivery.
Actively contributed to end-to-end feature strategy — participating in technical decision-making from initial development planning through implementation, testing, and production deployment — ensuring alignment between business requirements, technical design, and delivery timelines.

Program Analyst Trainee

Congnizant

Kolkata

04.2023 - 06.2023

Organized and attended weekly project meetings with other technical staff members, business owners and SMEs.
Pursued self-directed learning of technologies including ReactJS and JavaScript to enhance technical skill set.

Education

BTech - Information Technology

Heritage Institute of Technology, Kolkata