Principal Engineer, React

Simform

full-time

Posted on: 9/4/2025

Location: 🇮🇳 India

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Lead

AWSAzureCloudCypressEC2Google Cloud PlatformGraphQLJavaScriptJestNode.jsReactRedisReduxWebpack

About the role

Lead the end-to-end technical design, development, and performance optimization of highly interactive, real-time frontend applications using React.
Guide backend architecture and implementation in Node.js, focusing on API performance, scalability, and fault tolerance.
Proactively identify and resolve latency, memory, and performance issues in both frontend and backend layers.
Own code quality across the stack through code reviews, performance audits, and adherence to best practices.
Architect and implement reusable components, maintainable state management, and efficient rendering strategies in React.
Ensure security best practices, especially for financial or sensitive applications (prevent XSS, CSRF, data leaks, etc.).
Collaborate with product managers, UI/UX designers, and tech leads to translate business requirements into robust technical solutions.
Optimize real-time data handling and rendering (e.g., charting libraries, websocket-based updates).
Provide technical mentorship to engineers and foster a culture of engineering excellence.
Contribute to DevOps and CI/CD pipeline improvements and own technical POCs, benchmarking, and technology evaluations.

8+ years of hands-on experience building and scaling web applications using React.js and Node.js.
Deep understanding of the React ecosystem, including Hooks, Context API, performance profiling tools, and modern state management libraries (Redux, Zustand, etc.).
Strong experience working with RESTful APIs, GraphQL, and backend data processing in Node.js.
Solid grasp of JavaScript performance tuning, bundling (Webpack, Vite), lazy loading, and SSR/CSR trade-offs.
Demonstrated experience in high-transactional systems or real-time platforms such as trading or financial charting applications.
Strong knowledge of AWS services (EC2, S3, Lambda, API Gateway, CloudFront, RDS, etc.) and cloud-native architecture.
Expertise in scalability (horizontal/vertical), caching strategies (Redis, CDN), and load balancing.
Hands-on experience with observability and monitoring tools (e.g., New Relic, Datadog, CloudWatch).
Strong understanding of secure application development practices (OWASP top 10, TLS, encryption).
Proven experience working in Agile teams and delivering production-grade systems.
Excellent communication skills and ability to collaborate across teams and present technical concepts to stakeholders.
Plus points: MERN stack experience, server-side rendering (SSR) experience, testing frameworks (Jest, Cypress), GraphQL API development, design patterns, experience in stock trading/charting platforms.