Fullstack Product Engineer

Role Overview

We are looking for a Senior Full Stack Developer to build and scale our fintech platform. You will own the entire lifecycle of our financial products, from designing high-performance relational schemas in PostgreSQL to building interactive dashboards in React.

Key Responsibilities

• Full Stack Development: Build and maintain end-to-end features using the PERN stack

(PostgreSQL, Express.js, React, Node.js).

• Database Optimization: Design complex relational models and optimize SQL queries to

handle high-volume financial data and audit trails.

• Security & Compliance: Implement rigorous security measures (e.g., JWT, OAuth, data

encryption) and ensure the platform adheres to fintech standards like PCI-DSS.

• API Architecture: Develop robust RESTful APIs to integrate with third-party banking APIs,

payment processors (Stripe/Plaid), and KYC providers.

Technical Requirements

• Front-end: Advanced proficiency in React.js (Hooks, Context API, Redux or TanStack Query)

and modern CSS (Tailwind/Styled Components).

• Back-end: Expert-level Node.js and Express.js experience, with a focus on asynchronous

programming and secure API design.

• Database: Deep knowledge of PostgreSQL (complex joins, indexing, triggers, and

migrations).

Additional skills

• Understanding of Event-Driven Architecture (using AWS SQS/SNS or Kafka).

• Familiarity with SOC2 or ISO 27001 compliance frameworks.

• Cloud (AWS): Proven experience with:

• RDS/Aurora for managed databases.
• IAM for secure access management.
• AWS Lambda & API Gateway for serverless architecture.
• CloudWatch for monitoring and alerting.

• Tools: Git, Docker, and experience with CI/CD workflows.

About US

RJ Fintech Solutions Pvt. Ltd. is a high-growth fintech startup on a mission to automate business financial operations. In a world where financial systems are often slow and opaque, we are building the "missing link"—a secure, transparent, and lightning-fast platform that puts banking and compliance first for various corporates.

We are not just another financial app; we are an engineering-first company. We believe that elegant code and robust architecture are the foundations of trust. By leveraging the PERN stack and AWS cloud-native infrastructure, we are replacing legacy complexity with modern, scalable solutions.

Why Work With Us?

1. Build the Foundation, Not Just Features

You won't be a small cog in a massive machine. As an early member of our engineering team, you will help define our technical architecture, choose our libraries, and set the coding standards for everyone who follows. Your fingerprints will be on the core DNA of our product.

2. Solve Problems That Matter

Fintech is one of the few industries where code has a direct, measurable impact on people's lives.

Whether we are [e.g., simplifying cross-border payments, democratizing investment, or building the next generation of credit], you will be solving high-stakes challenges around security, trust, and financial inclusion.

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.

We are seeking a highly skilled and experienced MERN (MongoDB, Express.js, React, Node.js) Stack Developer to join our dynamic development team. As a MERN Stack Developer, you will be responsible for designing, developing, and maintaining scalable web applications using the MERN stack framework.

• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model.
• Expertise in backend programming with Node.js and MongoDB.
• Experience with React.js and redux.
• Material UI and 3rd party libraries.
• Experience with clean code writing practices like avoiding callback hell like promises, async.
• Thorough understanding of Node.js and its core principles.
• Experience with popular React.js workflows (such as Flux or Redux).
• Familiarity with newer specifications of ECMAScript.
• Experience with data structure libraries (e.g., Immutable.js).
• Familiarity with RESTful APIs.
• Knowledge of modern authorization mechanisms, such as JSON Web Token.
• Familiarity with modern front-end builds pipelines and tools.
• A knack for benchmarking and optimization.
• Familiarity with code versioning tools (such as Git, SVN, and Mercurial).

Responsibilities:

• Build Node.js APIs using microservices.
• Rewriting backend code with microservices architecture & Unit tests.
• Developing new user-facing features using React.js.
• Building reusable components and front-end libraries for future use.
• Translating designs and wireframes into high-quality code.
• Optimizing components for maximum performance across a vast array of web-capable devices and browsers.
• 
  

We are looking for a Full Stack Lead having worked on NodeJS and React with total experience of 4 to 6 years. Minimum two year of experience in NodeJS, React and Redux is required for this position.

Responsible for requirements understanding, propose architecture, detailed design, development and timely deliverables with the highest quality standards.

We are looking for Product creators who can work with minimum inputs from business and are able to deliver products quickly and with quality.

This person should have worked in Enterprise class product from scratch. Start-up experience would be highly desirable.

Tech Stack: Node.js, React.js, HTML, CSS, AWS, MySQL, MongoDB, Mix panel/Metabase, Instamojo and Razor Pay, Google Analytics, FB Pixel, SEO, Dev Ops, CI/CD, Micro services, Unit Testing

Responsibilities

·      Will be responsible for designing and developing web-based enterprise class solutions using NodeJS, React and Redux.

·      Should be expert in writing Unit Test Cases with NodeJS and React and with quality.

·      Excellent communication and presentation skills.

·      Proven experience as an individual contributor/Architect.

·      Should be able to quicky come up with system design by understanding business requirement and translate into good quality product.

·      Building reusable components and front-end libraries for future use.

·      Translating designs and wireframes into high quality code.

·      Optimizing components for maximum performance across a vast array of web-capable devices and browsers.

Skills

·      Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model

·      Thorough understanding of React.js, HTML, CSS and its core principles

·      Experience with popular React.js workflows (such as Flux or Redux)

·      Familiarity with newer specifications of ECMAScript

·      Experience with data structure libraries (e.g., Immutable.js)

·      Knowledge of isomorphic React is a plus

·      Familiarity with RESTful APIs

·      Knowledge of modern authorization mechanisms, such as JSON Web Token

·      Familiarity with modern front-end build pipelines and tools

·      Experience with common front-end development tools such as Babel, Webpack, NPM, etc.

·      Knowledge of CI/CD and should have worked on at least one tool like Jenkins etc.

·      Ability to understand business requirements and translate them into technical requirements

·      A knack for benchmarking and optimization

·      Familiarity with GIT Technology like GitHub, Bitbucket

Desirable (Nice to Have skills):

·      Knowledge of Data analytics platform like Meta Base.

·      Good understanding of digital marketing, Google & FB Analytics, consumer funnel data tracking tools, including SEO.

·      Experience of e-commerce start up would be an added plus.

·      Scaling experience using AWS, knowledge of EBS, Docker, Kubernetes, Microservices.

·      AWS Certification would be an added plus.

·      Knowledge of Dev/Ops and should be able to set up CI/CD quickly.

·      Participation in Hackathons is an added plus.

Eligibility

BTech or MTech in Computer Science from a reputed institute, IIT, NIT, BITS Pilani, COEP (Pune), VJTI, BHU or ISM

Good knowledge on Data Structure and Algorithms.

We are looking for experienced Full Stack Web Developers. Web Application developer who possesses a passion for pushing web technologies to the limits and will work with our team of talented engineers to design and build the next generation of our web applications.

Responsibilities

• Design and build scalable, mobile-first web applications
• Collaborate with cross-functional teams to define, design, and ship new features
• Unit-test code for robustness, including edge cases, usability, and general reliability
• Work on bug fixing and improving application performance
• Continuously discover, evaluate, and implement new technologies to maximize development efficiency

Skills

• BS/MS degree in Computer Science, Engineering or a related subject.
• 3 to 5 years of industry experience as a Full Stack Developer with focus in React.js and Node.js 
• Experience with Express.js and Node.js is a must.
• Experience with third-party libraries and APIs is required.
• Experience using Google Firebase is an asset.
• Experience in UI/UX design is preferred.
• You should also be up to speed on practices like TDD, CI/CD, and pair programming.
• You should be very comfortable working with Agile, Lean and Continuous Delivery practices -- and love it as much as we do.
• Understanding and playing a part in the entire cycle of software consulting and delivery (ideation, project conception, UX, code, testing, deployment, and around again).
• Working knowledge of the general web application landscape, architectures, trends, and emerging technologies.
• Solid understanding of the application development life cycle.

Our software developer for full stack role would be required to constantly work on building new features as per discussion with the product team.

Our front end code base is in Angular while the backend code base is in Python-Django.

Pre-requisites

• Expert level knowledge of Angular and Javascript
• Intermediate level knowledge of Python

Responsibilities

• Build new products / features from scratch
• Work on implementing and maintaing ticket booking flow on site
• Work on making existing features faster and better
• Work on reducing response time for all our apis

Qualifications & Skills

• Bachelor's degree or equivalent experience
• 1-6 years' experience in full stack development
• Hands-on with angular, python, django, mysql, mongodb, redis, rest-framework
• Ability to multi-task
• Strong verbal, written, and organizational skills
• Good analytical capabilities
• Mobile ecosystem knowledge