Job Description

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Job Summary

We are seeking a talented and experienced Senior Fullstack Engineer to join our Conversational AI (CXD) team. In this role, you will be responsible for designing, developing, and maintaining robust and scalable AI-powered web applications with a strong focus on frontend development (60-70%) while maintaining solid backend capabilities. You will work closely with product managers, designers, and other engineers to build next-generation AI experiences including chat interfaces, LLM integrations, and intelligent user interactions. The ideal candidate will have deep JavaScript expertise, strong React ecosystem knowledge, experience with AI/LLM technologies, and a passion for building high-quality, maintainable solutions that effectively integrate cutting-edge AI capabilities.

Responsibilities

AI Application Development

: Build AI-powered chat applications, conversational interfaces, and intelligent user experiences

Multi-Agent Systems

: Design and implement complex AI workflows using, for example, LangGraph and multi-agentic architectures

LLM Observability

: Implement monitoring, logging, and performance tracking for AI/LLM integrations

Frontend Development

: Design, develop, and maintain responsive web applications using React, Next.js, and TypeScript with deep JavaScript expertise

System Architecture

: Make strategic technical decisions about AI application structure, data flow patterns, and scalability solutions

Performance Engineering

: Optimize Core Web Vitals, bundle analysis, rendering performance, and AI response times for complex applications

API Integration

: Develop and consume RESTful APIs, GraphQL services, and LLM APIs with proper error handling and state management

Technical Leadership

: Conduct code reviews, mentor junior developers, and establish frontend development standards

Business Translation

: Work with stakeholders to translate business requirements into technical solutions and feasibility assessments

Test Automation

: Develop comprehensive automated unit, integration, and end-to-end tests

Production Support

: Debug complex production issues, memory leaks, race conditions, and cross-browser inconsistencies

Security Implementation

: Implement authentication flows, XSS prevention, data privacy and AI safety measures

Backend Development

: Build and maintain Node.js/Express.js APIs, database integrations, and AI service orchestration

Requirements

Experience & Education

Bachelor's degree in Computer Science, Engineering, or related field 5-8 years of experience in fullstack development with frontend focus Proven experience building chat applications and conversational interfaces Experience integrating with AI/ML APIs and LLM frameworks Strong analytical, problem-solving, and technical communication skills Excellent collaboration abilities and experience working in cross-functional teams

Core Technical Expertise

Frontend Technologies

Advanced JavaScript (ES6+, closures, prototypes, async patterns, event loop, browser APIs) React.js with hooks, context, and modern patterns Next.js including SSR, SSG, and App Router TypeScript with deep understanding of type system Component libraries (Ant Design or Material-UI) State management solutions (Redux, React Query)

Backend & Data

Node.js & Express.js for API development Database technologies (PostgreSQL, MongoDB, or MySQL) RESTful APIs and GraphQL services

AI/LLM Integration

OpenAI APIs, LangChain, or similar frameworks Streaming AI responses and error handling Performance optimization for AI applications Multi-agent system implementation

Development Practices & Tools

Modern testing frameworks (Jest, React Testing Library, Cypress) Performance monitoring and debugging tools Git version control and collaborative workflows CI/CD pipelines and deployment automation System architecture patterns and scalable application design Security best practices including authentication flows and XSS prevention

Performance & Optimization

Core Web Vitals optimization Bundle analysis and rendering performance Memory management and browser-specific optimizations Cross-browser compatibility and debugging

Mandatory Skills

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Python, React.Js, Javascript, node.js, typescript

Location

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Bangalore, Karnataka, India

Years Of Exp

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6 to 8 years

Why you should choose us

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Are you interested in working for a Global Leader in E-commerce
Are you excited about working on highly scalable platforms and applications that are accessed by millions of users every day
If so, read on to find out more about the opportunity.


Rakuten is the largest E-commerce company in Japan and one of the largest E-commerce and Internet Services companies in the World. Rakuten is ranked in top 20 most innovative companies in the world by Forbes.


Rakuten India Development Centre is the second largest technology hub outside of Japan that enables & builds platforms for global E commerce, Payments, Digital, AI, Data Science services across the globe. The India arm serves as a research and development center with an employee strength of around 450+ (& Growing).


Rakuten is committed to cultivating and preserving a culture of inclusion and connectedness. We are able to grow and learn better together with a diverse team and inclusive workforce. The collective sum of the individual differences, life experiences, knowledge, innovation, self-expression, and talent that our employees invest in their work represents not only part of our culture, but our reputation and Rakuten's achievement as well. In recruiting for our team, we welcome the unique contributions that you can bring in terms of their education, opinions, culture, ethnicity, race, sex, gender identity and expression, nation of origin, age, languages spoken, veteran's status, color, religion, disability, sexual orientation and beliefs"