MERN Stack Developer - React.Js and Node.Js

Job Title:

Senior Full Stack Developer

Experience: 5 to 7 Years. Minimum 5yrs FSD exp mandatory

Location: Bangalore (Onsite)

About ProductNova:

ProductNova is a fast-growing product development organization that partners with ambitious companies to build, modernize, and scale high-impact digital products. Our teams of product leaders, engineers, AI specialists, and growth experts work at the intersection of strategy, technology, and execution to help organizations create differentiated product portfolios and accelerate business outcomes.

Founded in early 2023, ProductNova has successfully designed, built, and launched 20+ large-scale, AI-powered products and platforms across industries. We specialize in solving complex business problems through thoughtful product design, robust engineering, and responsible use of AI.

What We Do

Product Development

We design and build user-centric, scalable, AI-native B2B SaaS products that are deeply aligned with business goals and long-term value creation.

Our end-to-end product development approach covers the full lifecycle:

● Product discovery and problem definition

● User research and product strategy

● Experience design and rapid prototyping

● AI-enabled engineering, testing, and platform architecture

● Product launch, adoption, and continuous improvement

From early concepts to market-ready solutions, we focus on building products that are resilient, scalable, and ready for real-world adoption. Post-launch, we work closely with customers to iterate based on user feedback and expand products across new use cases, customer segments, and markets.

Growth & Scale

For early-stage companies and startups, we act as product partners—shaping ideas into viable products, identifying target customers, achieving product-market fit, and supporting go-to-market execution, iteration, and scale.

For established organizations, we help unlock the next phase of growth by identifying opportunities to modernize and scale existing products, enter new geographies, and build entirely new product lines. Our teams enable innovation through AI, platform re-architecture, and portfolio expansion to support sustained business growth.

Role Overview

We are looking for a Senior Full Stack Developer with strong expertise in frontend development using React JS, backend microservices architecture in C#/Python, and hands-on experience with AI-enabled development tools. The ideal candidate should be comfortable working in an onsite environment and collaborating closely with cross-functional teams to deliver scalable, high-quality applications.

Key Responsibilities:

• Develop and maintain responsive, high-performance frontend applications using React JS

• Design, develop, and maintain microservices-based backend systems using C#, Python

• Experienced in building Data Layer and Databases using MS SQL, Cosmos DB, PostgreSQL

• Leverage AI-assisted development tools (Cursor / GitHub Copilot) to improve coding

efficiency and quality

• Collaborate with product managers, designers, and backend teams to deliver end-to-end

solutions

• Write clean, reusable, and well-documented code following best practices

• Participate in code reviews, debugging, and performance optimization

• Ensure application security, scalability, and reliability

Mandatory Technical Skills:

• Strong hands-on experience in React JS (Frontend Coding) – 3+ yrs

• Solid experience in Microservices Architecture C#, Python – 3+ yrs

• Experience building Data Layer and Databases using MS SQL – 2+ yrs

• Practical exposure to AI-enabled development using Cursor or GitHub Copilot – 1yr

• Good understanding of REST APIs and system integration

• Experience with version control systems (Git), ADO

Good to Have:

• Experience with cloud platforms (Azure)

• Knowledge of containerization tools like Docker and Kubernetes

• Exposure to CI/CD pipelines

• Understanding of Agile/Scrum methodologies

Why Join ProductNova

● Work on real-world, high-impact products used at scale

● Collaborate with experienced product, engineering, and AI leaders

● Solve complex problems with ownership and autonomy

● Build AI-first systems, not experimental prototypes

● Grow rapidly in a culture that values clarity, execution, and learning

If you are passionate about building meaningful products, solving hard problems, and shaping the future of AI-driven software, ProductNova offers the environment and challenges to grow your career.

Job Responsibilities

The Software Engineer EIS Developer develops EIS and Java code for intermediate modules, participates in design reviews, conducts code reviews, creates test plans and resolves moderate defects.  The Developer designs, documents, reviews, and maintains components of software solutions for intermediate projects.  It also includes reacting to production problems or supporting production changes where those applications are operating.

• Strong understanding of EIS (V12 or V20) and Core Java concepts
• 5-7 year of experience
• Knowledge of the Insurance business is a plus
• Highly motivated with good written and oral communication skills.
• Ability to lead conversations and coordinate activities across various time zones.
• Flexibility to adapt to changing priorities and assignments, ability to work well under pressure, as well as ability to work independently.
• Ability to be accountable for key processes of high complexity, high risk, and high visibility.
• Ability to learn new skills quickly and willingness to challenge yourself
• Advanced SQL skills (individuals need to have solid SQL debugging and tuning skills)
• Advanced Oracle Knowledge
• Intermediate UNIX

Primary Skills

• EIS V12 or V20
• Product Factory (V12)
• Kraken Rules (V20)
• Java & React
• OOPS
• Java SpringBoot
• SOAP/REST/JSON
• TDD(Unit/Integration/Acceptance)
• Code Refactoring
• GIT 
• Coding standards
• Build Process
• Security (Web security/API Security)
• HTML/CSS
• Cloud Infrastructure
• Jenkins/Gradle
• Strong communication skills
• Strong analytical ability

Experience

• Overall experience of 5 -7 years of software development
• At least 3 years of experience as a Java and React development
• At least 1 year as a full stack developer with Cloud/PCF experience
• Wide experience with a diverse set of technologies, approaches, tools, etc. would be ideal.
• Good knowledge of Java programming, SQL, Unix
• Exposure and knowledge to Agile methodologies
• Experience in Java development and web front-end development.
• Experience deploying to cloud environments a plus
• Exposure to test-driven development
• Strong communication skills
• Passion for growing your skills, tackling interesting work and solving challenging problems
• Enthusiasm for community, learning, and collaboration
• Excitement about open source software

Shift Timing

·        13:00 - 21:30 PM for overlap with onsite business partner

A full stack developer job description for MERN stack developers centers on designing, developing, and maintaining robust web applications using MongoDB, Express.js, React, and Node.js as core technologies.

Responsibilities

• Develop and maintain scalable web applications using the MERN stack.
• Build interactive and responsive user interfaces with React.
• Implement server-side APIs and business logic using Node.js and Express.js.
• Design, model, and manage databases with MongoDB to ensure efficient data storage and retrieval.
• Integrate front-end with back-end systems and third-party services.
• Optimize applications for speed and scalability, troubleshoot and debug code, and ensure reliability.
• Collaborate with other developers, designers, and stakeholders in an agile environment to clarify requirements and deliver solutions.
• Implement security best practices and protect sensitive data.
• Participate in code reviews and mentor junior developers.

Requirements

• Proven experience with the MERN stack (MongoDB, Express.js, React, Node.js).
• Strong skills in JavaScript, HTML5, and CSS3.
• Familiarity with RESTful API design, version control systems (Git), and front-end frameworks like Bootstrap or Material-UI.
• Understanding of database design, schema management, and NoSQL principles.
• Problem-solving ability and communication skills.
• Bachelor's degree in computer science or related field (preferred).
• Experience working collaboratively in a team-oriented environment.

Key Skills

• JavaScript, React.js, Node.js, Express.js, MongoDB.
• HTML/CSS, RESTful APIs, Git.
• Familiarity with agile methodologies and UI/UX best practices.
• Testing, debugging, code optimization, and deployment.

Full Stack senior developer with ReactJS & Redux

• Node js with Express framework

• Knowledge of HTML, CSS and Javascript with React JS
• Experience with MongoDB
• Knowledge of RESTful APIs.
• Experience with web paradigms such as REST, Responsive Web Design etc.
• Experience with CI/CD tooling (at least Git and Jenkins)
• Good understanding of code versioning tools, such as GIT
• Good to know Agile/Scrum/Kanban

Founding Engineer - LITMAS

About LITMAS

LITMAS is revolutionizing litigation with the first AI-powered platform built specifically for elite litigators. We're transforming how attorneys research, strategize, draft, and win cases by combining comprehensive case repositories with cutting-edge AI validation and workflow automation. We are a team incubated by experienced litigators, building the future of legal technology.

The Opportunity

We're seeking a Founding Engineer to join our core team and shape the technical foundation of LITMAS. This is a rare opportunity to build a category-defining product from the ground up, working directly with the founders to create technology that will transform the US litigation market.

As a founding engineer, you'll have significant ownership over our technical architecture, product decisions, and company culture. Your code will directly impact how thousands of attorneys practice law.

What You'll Do

• Architect and build core platform features using Python, Node.js, Next.js, React, and MongoDB
• Design and implement production-grade LLM systems with advanced tool usage, RAG pipelines, and agent architectures
• Build AI workflows that combine multiple tools for legal research, validation, and document analysis
• Create scalable RAG infrastructure to handle thousands of legal documents with high accuracy
• Implement AI tool chains to provide agents tool inputs
• Design intuitive interfaces that make complex legal workflows simple and powerful
• Own end-to-end features from conception through deployment and iteration
• Establish engineering best practices for AI systems including evaluation, monitoring, and safety
• Collaborate directly with founders on product strategy and technical roadmap

The Ideal Candidate

You're not just an AI engineer, you're someone who understands how to build reliable, production-grade AI systems that users can trust. You've wrestled with RAG accuracy, tool reliability, and LLM hallucinations in production. You know the difference between a demo and a system that handles real-world complexity. You're excited about applying AI to transform how legal professional’s work.

What We're Looking For

Must-Haves

• Deployed production-grade LLM applications with demonstrable experience in:
• Tool usage and function calling
• RAG (Retrieval-Augmented Generation) implementation at scale
• Agent architectures and multi-step reasoning
• Prompt engineering and optimization
• Knowledge of multiple LLM providers (OpenAI, Anthropic, Cohere, open-source models)
• Background in building AI evaluation and monitoring systems
• Experience with document processing and OCR technologies
• 3+ years of production experience with Node.js, Python, Next.js, and React
• Strong MongoDB expertise including schema design and optimization
• Experience with vector databases (Pinecone, Weaviate, Qdrant, or similar)
• Full-stack mindset with ability to own features from database to UI
• Track record of shipping complex web applications at scale
• Deep understanding of LLM limitations, hallucination prevention, and validation techniques

Tech Stack

• Backend: Node.js, Express, MongoDB
• Frontend: Next.js, React, TypeScript, Modern CSS
• AI/ML: LangChain/LlamaIndex, OpenAI/Anthropic APIs, vector databases, custom AI tools
• Additional: Document processing, search infrastructure, real-time collaboration

What We Offer

• Significant equity stake true ownership in the company you're building
• Competitive compensation commensurate with experience
• Direct impact your decisions shape the product and company
• Learning opportunity work with cutting-edge AI and legal technology
• Flexible work remote-first with a global team
• AI resources access to latest models and compute resources

Interview Process

One more thing: Our process includes deep technical interviews and fit conversations. As part of the evaluation, there will be an extensive take-home test that should expect to take at least 4-5 hours depending on your skill level. This allows us to see how you approach real problems similar to what you'll encounter at LITMAS.

Position description:

We’re looking for a senior full stack developer (MERN) with a proven experience to design and create software. The responsibilities will include coding both on the front and back-end, writing APIs, and React components.  

Having an experience of web development using JavaScript, you should be able to create web applications from scratch. The ideal candidate should have experience of working in agile teams. 

Primary Responsibilities:

• Participating in the design and creation of scalable software
• Writing clean, functional code on the front- and back-end
• Writing unit tests and fixing bugs or other coding issues
• Develop and manage well-functioning databases and applications
• Write effective APIs and react components
• Perform peer code reviews

Reporting Team

• Reporting Designation: Full Stack Development (KH_PPLS_PE_SPD.Full Stack Development)
• Reporting Department: Software Product Development (KH_PPLS_PE_SPD)

Required Certification/s:

Required work experience

• Industry: IT
• Role: Web Development
• Years of experience: 3 to 6

Key Performance Indicators:

• 3-6 years of industry work experience 
• Proven experience as a Full Stack Developer or similar role 
• 1+ years of web application development with JavaScript as full stack 
• End-to-end full stack experience designing and building scalable applications 
• Excellent JavaScript / Typescript skills 
• Strong proficiency in React (hooks knowledge is plus) 
• Strong proficiency in Nodejs 
• Good HTML5 / CSS3 skills with expertise on responsive web design 
• Must have development experience in Micro services using NodeJS and TypeScript 
• Experience with NoSQL databases such as MongoDB, mongoose, aggregation framework and Redis 
• Experience with Web sockets and related frameworks (e.g. Socket.IO) 
• Experience in using and developing GraphQL APIs 
• Knowledge of code versioning tools such as Git, Mercurial or SVN. 
• Open minded to take up any challenge, research and provide solutions –  

Required Competencies:

• Great attention to detail 
• Testing libraries – jest, testing-library is plus 
• TDD / BDD experience is plus 
• Experience with AWS, K8S is plus 

• Familiar with SDLC methodologies like SCRUM, AGILE, Continuous Integration  

Required Skills:

ReactJS, Node.JS, HTML, CSS, Javascript, NoSQL 

• Own our user interfaces with an eye to lightning-fast performance and a great user experience
• Implement compelling and intuitive UIs, shaping the design and feel of the product alongside our founders
• Write a significant amount of code for new and existing features
• Ship high-quality code and architecture
• Mentor engineers on the team, developing their skills and helping advance their careers
• Help shape the future of our engineering organization

Requirements

• You have been building production web applications for 5+ years and know the systems from top to bottom
• You know SQL and have significant programming experience on the frontend with React
• You have a BS/MS/Ph.D. in a scientific field or equivalent experience
• You want to work in a fast-paced, high-growth startup environment that respects its engineers and customers
• Comfortable working with a 100% distributed engineering team, collaborating on GitHub, Slack, Zoom, etc. in the open and as a self-starter.

Bonus points

• You have backend experience building microservices
• You’ve contributed to open-source libraries and actively participate in the development community (blogging, meetups, tweeting, etc.)
• You have experience building interactive data visualizations
• You have worked in TypeScript, Java, Go