Senior Full Stack Developer (MERN)

Sapphire Software Solutions; Ahmedabad District; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Sapphire Software Solutions is seeking a Senior Full Stack Developer (MERN) with 4+ years of experience to design, develop, and deploy scalable web apps. You will work across frontend and backend using Node.js, React, Next.js, and various databases, integrating cloud services and third-party APIs.

The role emphasizes building high-performance applications, teamwork with clients and engineers, and continuous learning in a fast-paced environment.

Qualifications

• 4+ years of professional full-stack development experience, preferably in a service-based company with multi-client exposure.
• Experience with stock trading platforms, brokerage APIs, real-time market data, and trading workflows preferred.
• Experience with Google Analytics, event tracking, and user behavior analytics.
• Strong expertise in Node.js, React.js, and Next.js for scalable web apps.
• Database proficiency in MongoDB, MySQL, and PostgreSQL for data modeling and optimization.

Responsibilities

• Develop and deploy end-to-end web applications integrating cloud services and APIs.
• Collaborate with cross-functional teams and clients to deliver robust solutions.
• Implement trading strategies, indicators, and automated workflows.
• Ensure performance, quality, and responsiveness of applications.
• Maintain code quality, organization, and automated deployments.

Skills

Full-stack development

English communication

Mentoring juniors

Client-facing discussions

Problem solving

Education

Bachelor's degree in CS/Engineering

Tools

Node.js

React.js

Next.js

MongoDB

MySQL

PostgreSQL

REST APIs

GraphQL

AWS

Azure

GCP

Docker

Redis

TypeScript

Redux

Tailwind CSS

Git

Jest

Mocha

WebSocket

Stripe

Twilio

Google APIs

Prisma

Apollo

CI/CD

Google Analytics

Job description

We are looking for a highly skilled Senior Full Stack Developer (MERN) with 4+ years of proven experience to join our engineering team. The ideal candidate should have a solid track record of building scalable, high-performance web applications with expertise across both frontend and backend development.

In this role, you will be responsible for designing, developing, and deploying end-to-end solutions that integrate cloud services, databases, and third-party APIs. You should be proficient in Node.js, React.js, Next.js, MongoDB, PostgreSQL, REST APIs, GraphQL, and AWS services, with strong experience in third-party API integrations and multi-platform deployments. Excellent communication skills in English are essential for collaborating with clients and team members.

If you are passionate about technology, thrive in fast-paced environments, and enjoy solving complex problems with innovative solutions, we would love to hear from you.

Skills:

• 4+ years of professional full-stack development experience, preferably in a service-based company with exposure to multiple client projects.
• Hands-on experience with stock trading platforms, brokerage APIs, real-time market data, and trading workflows is highly preferred.
• Experience with Google Analytics, event tracking, and application/user behavior analytics.
• Strong expertise in Node.js (server-side logic, API development), React.js (interactive UIs), and Next.js (SSR, static generation, API routes).
• Database proficiency in MongoDB (NoSQL), MySQL, and PostgreSQL (SQL) for data modeling, querying, and optimization.
• Hands-on experience with RESTful APIs and GraphQL (Apollo, Prisma, etc.), including third-party API integrations (Stripe, Twilio, Google APIs) with authentication, webhooks, and rate-limiting.
• Experience with AWS services (EC2, S3, Lambda, RDS, etc.), as well as Azure, GCP, and VPS platforms (e.g., DigitalOcean), including knowledge of infrastructure as code for deployments.
• Experience with CI/CD pipelines, Docker, and automated deployment workflows.
• Hands-on experience with Redis, caching, queues, and background job processing.
• Additional frontend experience with TypeScript, Redux, Tailwind CSS.
• Familiarity with microservices architecture, event-driven systems, and real-time applications (e.g., WebSocket).
• Knowledge of security best practices, including JWT authentication, encryption, and data protection.
• Strong command of Git, agile methodologies, and testing frameworks (Jest, Mocha).
• Ability to optimize application performance, troubleshoot issues, and implement best practices for security, scalability, and maintainability.
• Experience in code reviews, mentoring junior developers, and contributing to architectural decisions.
• Ability to collaborate with cross-functional teams, participate in client-facing discussions, and communicate fluently in English (spoken and written).
• Continuously stay updated with emerging technologies and apply improvements to existing systems.
• Excellent problem-solving skills, attention to detail, and ability to work independently or collaboratively.
• Bachelors degree in Computer Science, Engineering, or related field, or equivalent professional experience

Responsibilities:

• Enjoys working in a team environment, talking to other people, problem-solving, and learning new technologies.
• Implement trading strategies, technical indicators, and automated trading workflows.
• Ensure the performances, quality, and responsiveness of applications
• Help maintain code quality, organization, and automatization
• Continuously discover, evaluate, and implement new technologies to maximize development efficiency.
• Implement Google Analytics, event tracking, and user behavior analytics.
• Design, develop, and maintain robust full-stack applications using Node.js, React.js, and Next.js.
• Implement Redis caching, queues, and background job processing.
• Build and maintain RESTful APIs and GraphQL endpoints for efficient data handling.
• Work with MongoDB, MySQL and PostgreSQL for data modeling, querying, and optimization.
• Integrate AWS services (EC2, S3, Lambda, RDS, etc.) to ensure scalability, security, and reliability.
• Manage CI/CD pipelines, Docker, and automated deployments.
• Manage third-party API integrations (e.g., Stripe, Twilio, Google APIs), including authentication, webhooks, and error handling.
• Deploy applications across AWS, Azure, GCP, and VPS platforms (e.g., DigitalOcean) with knowledge of infrastructure as code.
• Collaborate with cross-functional teams,communicate effectively in English, and participate in client-facing discussions.
• Conduct code reviews, mentor junior developers, and contribute to architectural and design decisions.
• Optimize application performance, troubleshoot issues, and implement best practices for security, scalability, and maintainability.
• Work on multiple client projects simultaneously, adapting to diverse business domains and requirements.
• Stay updated with emerging technologies and continuously apply them to improve existing systems.