11+ Authorization Jobs in Mumbai | Authorization Job openings in Mumbai

Position: Full Stack Developer (React.js + Node.js)

Experience: 2–5 Years

Location: Mumbai – Chembur West (Onsite)

Job Summary

We are looking for a Full Stack Developer with strong hands-on experience in React.js and Node.js to build scalable, secure, and high-performance web applications. The ideal candidate should be comfortable owning features end-to-end, developing responsive UI, building REST APIs, integrating databases, and supporting production systems.

Key Responsibilities

• Build responsive UI using React.js, HTML5, CSS3, JavaScript (ES6+)
• Develop scalable backend services and RESTful APIs using Node.js (Express.js / NestJS)
• Work with MongoDB and MySQL (schema design, indexing, query optimization)
• Implement authentication & authorization using JWT , RBAC , Oauth
• Integrate third-party APIs, Webhooks
• Build real-time features using Socket.io / WebSockets
• Ensure performance, scalability, and security (validation, sanitization)
• Implement caching using Redis (if applicable) and optimize API response times
• Support API testing (Postman/Supertest)
• Maintain API documentation using Swagger / OpenAPI
• Debug and resolve defects, handle RCA, and support production troubleshooting with logs/monitoring
• Follow Git-based workflows, participate in code reviews, and collaborate with QA/product teams in Agile delivery

Mandatory Skills

• React.js, Node.js, JavaScript (ES6+)
• MongoDB (must), MySQL
• REST API development & integration
• Socket.io / WebSockets, Webhooks
• HTML5, CSS3
• Git
• Typescript, Express.js / NestJS
• jQuery / AJAX (basic / legacy support)

Good to Have

• Redis, Swagger/OpenAPI
• Docker, CI/CD (GitHub Actions/Jenkins)
• Cloud exposure (AWS/Azure/GCP)

Qualification

BE / BTech / MCA / MSc IT / BSc IT with 2–5 years relevant experience.

CTC: As per industry std.

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.

Job Title: MERN Full Stack Developer (2+ Years Experience)

Location: Borivali

Experience Required: 2+ Years

Employment Type: Full-time

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Job Summary

We are looking for a skilled MERN Full Stack Developer with 2+ years of hands-on experience in building scalable web applications using the MERN stack. The ideal candidate should also have practical exposure to AI tools and integrations, and be comfortable working in a fast-paced, product-driven environment.

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Primary Skills (Mandatory)

• Strong experience in MongoDB, Express.js, React.js, Node.js
• Proficiency in JavaScript (ES6+)
• Experience building RESTful APIs
• Frontend development using React (Hooks, Context API)
• Backend development using Node.js and Express
• Database design and optimization using MongoDB
• Version control using Git

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AI Tools & Integration Experience (Required)

• Experience working with AI tools such as ChatGPT/OpenAI APIs or similar AI platforms
• Integrating AI APIs into web applications
• Basic understanding of prompt engineering
• Experience using AI for automation, content generation, data processing, or workflow optimization
• Familiarity with vector databases or embeddings (good to have)

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Key Responsibilities

• Develop and maintain full-stack web applications using MERN stack
• Design and develop scalable REST APIs
• Integrate third-party services and AI-based tools into applications
• Optimize applications for performance and scalability
• Collaborate with UI/UX designers and product teams
• Write clean, maintainable, and well-documented code
• Participate in code reviews and debugging

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Good to Have

• Experience with TypeScript
• Knowledge of cloud platforms (AWS, Azure, or GCP)
• Understanding of CI/CD pipelines
• Experience with Docker
• Basic understanding of microservices architecture

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Candidate Profile

• 2+ years of relevant experience in full-stack development
• Strong problem-solving and logical thinking skills
• Ability to work independently and in a team
• Good communication skills

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Job Types: Full-time, Permanent

Work Location: In person

About the Role

We’re looking for a passionate Fullstack Product Engineer with a strong JavaScript foundation to work on a high-impact, scalable product. You’ll collaborate closely with product and engineering teams to build intuitive UIs and performant backends using modern technologies.

Responsibilities

• Build and maintain scalable features across the frontend and backend.
• Work with tech stacks like Node.js, React.js, Vue.js, and others.
• Contribute to system design, architecture, and code quality enforcement.
• Follow modern engineering practices including TDD, CI/CD, and live coding evaluations.
• Collaborate in code reviews, performance optimizations, and product iterations.

Required Skills

• 4–6 years of hands-on fullstack development experience.
• Strong command over JavaScript, Node.js, and React.js.
• Solid understanding of REST APIs and/or GraphQL.
• Good grasp of OOP principles, TDD, and writing clean, maintainable code.
• Experience with CI/CD tools like GitHub Actions, GitLab CI, Jenkins, etc.
• Familiarity with HTML, CSS, and frontend performance optimization.

Good to Have

• Exposure to Docker, AWS, Kubernetes, or Terraform.
• Experience in other backend languages or frameworks.
• Experience with microservices and scalable system architectures.

Job Title - MERN Stack Developer

Experience Range – 3 to 6 Years

Location- Mumbai (Andheri East)

Mode- 5 Days working from office

Some specific Requirements:

• You have prior experience developing and working on consumer-facing web/app products
• Hands-on experience in JavaScript. Exceptions can be made if you’re really good at any other language with experience in building web/app-based tech products
• Expertise in Node.JS and Experience in at least one of the following frameworks - Express.js, Koa.js, Socket.io .
• Good knowledge of async programming using Callbacks, Promises, and Async/Await
• Hands-on experience with Frontend codebases using HTML, CSS, and AJAX
• Working knowledge of MongoDB, Redis, MySQL
• Good understanding of Data Structures, Algorithms, and Operating Systems
• You've worked with AWS services in the past and have experience with EC2, ELB, AutoScaling, CloudFront, S3
• Experience with Frontend Stack would be added advantage (HTML, CSS)
• You might not have experience with all the tools that we use but you can learn those given the guidance and resources
• Experience in Vue.js would be plus

What you’ll be doing

• Lead the development of our across all phases of software and web development including ideation, prototyping, design, production, and maintenance.
• Work closely with founders and internal/external stakeholders to build products, tools, and services from scratch and deliver high-quality software solutions.
• Be actively involved in requirements gathering, customer interviews and the creation of robust product solutions.
• Brainstorm and lay the foundations of the technology and architectural roadmap as well as the development processes.
• Share your technical expertise to help the team make thoughtful and scalable design decisions and identify performance bottlenecks to troubleshoot quickly.
• Manage product development priorities, deadlines, and deliverables.
• Hire and manage a small team of engineers (internal/outsourced).
• Ensure high-performant and responsive web applications and websites.

Skills & Qualities we’re looking for

• Bachelor’s/Master’s degree in Computer Science (or equivalent experience).
• 4-7 years of experience as a full-stack developer (rare exceptions for highly skilled developers) at a fast-paced, preferably early / growth stage start-up.
• Proficient with frontend technologies - HTML, CSS, JavaScript & ReactJS/VueJS.
• Proficient with backend technologies - Java/NodeJs/Golang/Python/Ruby.
• Hands-on experience working with any cloud AWS/GCP/Azure/DigitalOcean.
• Knowledge of codebases and version control systems (Git).
• Well-versed with SQL database design & RDBMS concepts.
• Strong arithmetic reasoning, logical and analytical thinking skills.
• Strong knowledge of code quality maintenance and performance analysis.

Backend Developer/Full Stack Developer Job Description - We are looking for developers who can convert complex business problems into tech deliverables, build scalable systems and work in a fast-paced environment.

Responsibilities:

Building scalable and robust applications.

Building and maintaining reusable code for future use.

Actively participate in code reviews.

Troubleshooting and debugging.

Following predefined design guidelines.

Timely delivery of tasks

Proficient and fast in implementing required processes across teams.

Innovative and open to trying/learning new things to improve the system or processes.

Skills required

Proven experience as a Full Stack Developer/Backend Developer

Experience with large-scale architectural patterns, event-driven microservices, well-designed APIs, and efficient algorithms.

Knowledge of at least 1 Object Oriented Programming language (e. g. Node.js, Python)

Knowledge of at least 1 Relational database and familiarity with NoSQL databases.

Problem-solving skills.

Excellent communication and teamwork skills.

Git/BitBucket

Optional skills -

React/React Native

Docker

Terraform

CI/CD

AWS

Web technologies

Must haves - Javascript, Object Oriented Programming, Git

KEY RESPONSIBILITES:

• Participate in requirements analysis
• Collaborate with internal teams to produce software design and architecture
• Write clean, scalable code using .NET programming languages
• Test and deploy applications and systems
• Create API / webservices
• Develop documentation throughout the software development life cycle (SDLC)
  
  

Candidates with the below skillsets are preferred:

• Proven experience as a .NET Developer
• Familiarity with the http://asp.net/">NETframework, SQL Server and design/architectural patterns (e.g. Model-View-Controller (MVC))
• Knowledge of at least one of the .NET languages (e.g. C#, Visual Basic .NET) and HTML5/CSS3
• Familiarity with architecture styles/APIs (REST, RPC)
• Understanding of Agile methodologies
• Excellent troubleshooting and communication skills
• Attention to detail

Education Details: BSc/BA in Computer Science, Engineering or a related field

Expected Skills :-

• Knowledge/Application of data structures and algorithms.-
• Problem-solving attitude : This means when you face a problem (not necessarily technical), your natural reaction is "How can I solve it best" rather than "How can I get out of it/avoid it/overlook it"-
• Working knowledge in Java(SpringFramework) is a must.
• Working knowledge in ReactJs is a plus.- Working knowledge in Python, MongoDB is a plus.
• The founding team has extensive experience in launching and scaling up fintech products & New business verticals. The founders have rich leadership experience across Consulting, fintech and payment companies