SUBHAJIT SINGHA ROY
Senior Web Developer | MERN Stack | Innovating with Generative AI & Emerging Tech
Kolkata
Summary
Accomplished and results-driven MERN Stack Developer with over 12 years of experience in designing, developing, and deploying complex, scalable web applications using JavaScript, TypeScript, React js, Express js, Node.js, and MongoDB. Expertise includes generative AI, specializing in the creation of sophisticated AI agents and Retrieval-Augmented Generation (RAG) systems utilizing frameworks such as LangChain and LangGraph. A strong background in integrating various large language models—including GPT, Gemini, and Llama—enables the development of powerful, intelligent AI applications that drive innovation and efficiency. Committed to delivering high-quality solutions that meet dynamic business needs while staying at the forefront of technological advancements.
Overview
14
14
years of professional experience
4
4
years of post-secondary education
3
3
Languages
Work History
Senior Engineer
Fitch Ratings
Kolkata
01.2024 - Current
- Created Gen AI Based Agentic Solution for Finding Entity information, Create New Entity that reducing effort by up to 30%.
- Working on MCP Server and Client for Smart Entity Search.
- Integrated Open AI Sdk (Gpt models for prediction and Tool calling, text-embedding-ada models for Embeddings) with typescript .
- Working on Ai powered App to identify and create verify and Create golden copies of records from external sourced excel files.
- Using extensively Next.Js as a frontend layer and Express Js as api layer for Gen AI apps.
- Leveraged React component-based architecture to design and build modular and reusable components, enhancing code maintainability and application performance.
- Leveraged Node and Express.Js to create robust services that interact with Informatica SaaS MDM services.
- Worked extensively with Api Integration and operators to handle asynchronous data streams, managing complex state changes, and enhancing the responsiveness of the application.
- Developed and implemented efficient data retrieval and mapping strategies, handling Legal Entity details, Company Tree generation, Address information (dynamically segregated), business profiles, and configuration data synced from MDM SaaS Informatica.
- Extensively used Informatica Cloud api to create and merge multiple legal entity in MDM and generate Cross reference.
- Extensively Used In house developed Component library framework for implementing different component like Grid/Search/Loaders/Tabs and much more.
- Implemented a comprehensive testing suite using React Testing Library form DOM testing.
- Participated actively in code reviews and debugging sessions, encouraging a collaborative development environment and enabling knowledge sharing among team members.
- Collaborated closely with the team to translate business requirements into technical specifications, driving the development of an application that exceeded business expectations.
- Parent Company: TCS
Senior React Engineer (React 16+)
Scholastic
Kolkata
01.2022 - 12.2023
- Created an Interesting application that targets nursery going kids to learn pronunciation starting from the word and to paragraph in a game like manner with interactive feedback both visually and with audio.
- Extensively used Typescript to write cleaner code.
- Streamlined deployment processes using GitLab CI/CD, Aws S3 Bucket and Cloud front on top of it.
- Maintained more than 95% Code Coverage with Both Unit testing and with SonarQube integration.
- Collaborated with cross-functional teams to drive continuous improvement, providing technical guidance and mentorship to junior developers.
- Monitored application performance, resolved issues, and stayed current with industry trends to foster innovation and efficiency in deployment processes.
- Developed and maintained comprehensive documentation on processes, tools, and infrastructure, enabling efficient knowledge sharing and onboarding of new team members.
- Parent Company: TCS
Senior UI Developer (React 16)
Scholastic
Kolkata
08.2020 - 01.2022
- Expertly developed a high-performance application utilizing React 16, Flex, Redux, HTML, CSS, Typescript, and Webpack, showcasing proficiency in integrating RESTful APIs with Java & Spring Boot.
- Demonstrated expertise in enhancing application performance through dynamic bundling, lazy loading, memory leak removal, image compression.
- Generate Variety of reports by extensively using multiple Charts and Grid components(npm modules).
- Applied strong knowledge of React Testing library for thorough unit testing, and efficiently managed project branching, merging, and deployment strategies using Jenkins CI/CD pipeline, Bamboo, and Git.
- Adhered to Agile Scrum methodology for streamlined project development and mentored four team members in frontend development, showcasing effective leadership and Angular expertise.
- Parent Company: TCS
Senior Front-End Developer (Angular JS)
Tribune Publishing
Kolkata
04.2017 - 07.2020
- Led the successful migration of a large .Net based Legacy MVC application to Angular JS, boosting customer engagement by 40%.
- Pioneered strategies and approaches for resolving common challenges during migration, including shifting from MVC to MVVM scope-based architecture.
- Adopted Angular JS for better organization of the application, dividing the migrated application into feature modules, each encapsulating a specific functionality.
- Employed Angular Router Module to support the single-page application architecture, providing seamless navigation between different views and preserving state and functions across views.
- Effectively utilized Angular's HttpClient for making HTTP requests and handled async operations using the Promise.
- Created Admin, Order, Customer, Product Admin, Pricing Admin module and interconnect them to create end to end Business flow news paper advertising creation.
- Parent Company: TCS
Senior Software Developer (Php, MySql, Angular JS,Express JS)
Mass Software Solutions
04.2014 - 02.2017
- Design and Developed multiple Web application using Php based MVC framework like Code Igniter ,Cake, Laravel etc.
- Developed SPA based on Angular JS(1.X) and also created cross platform mobile applications using Ionic 1, Express Js.
- Parent Company: MSSPL
PHP Developer (Php, MySql, Wordpress)
Limtex Technologies
10.2011 - 04.2014
- Joined as Fresher and learn Web technologies like Php, Mysql, Codeigniter.
- Worked on multiple MVC web application , as well as Created Rest Api for multiple native IOS/android application.
- Parent Company: Limtex
Education
B.Tech - Information Technology
WBUT University
West Bengal 01.2007 - 01.2011
Skills
Javascript: React Js , Next Js
Node : Express Js
Mongo DB, Vector DB: Chroma, Pinecode
Typescript
Kafka
undefinedTimeline
Senior Engineer
Fitch Ratings
01.2024 - Current
Senior React Engineer (React 16+)
Scholastic
01.2022 - 12.2023
Senior UI Developer (React 16)
Scholastic
08.2020 - 01.2022
Senior Front-End Developer (Angular JS)
Tribune Publishing
04.2017 - 07.2020
Senior Software Developer (Php, MySql, Angular JS,Express JS)
Mass Software Solutions
04.2014 - 02.2017
PHP Developer (Php, MySql, Wordpress)
Limtex Technologies
10.2011 - 04.2014
B.Tech - Information Technology
WBUT University
01.2007 - 01.2011
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