Senior Full Stack 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.

DocNexus is revolutionizing the global medical affairs & commercial ecosystem with search. We provide a next-generation data platform that simplifies searching through millions of insights, publications, clinical trials, payments, and social media data within seconds to identify healthcare professionals (HCPs), products, manufacturers, and healthcare systems. Leveraging AI-powered Knowledge Graphs, DocNexus assists life science organizations in finding the right key opinion leaders (KOL/DOLs) who play a crucial role in developing and bringing life-saving pharmaceutical products and medical devices to market. Backed by industry leaders such as Techstars, JP Morgan, Mass Challenge, and recognized as one of the Top 200 Most Innovative Startups by TechCrunch Disrupt, we are committed to transforming healthcare insights. We are seeking a skilled and passionate DevOps Engineer to join our dynamic team and contribute to the efficient development, deployment, and maintenance of our platform.

We are looking for a visionary Sr. Full Stack Engineering Lead who is passionate about building and leading our technology department. The ideal candidate will have a solid technical background and experience in leading a team to drive innovation and growth. As Engineering Lead, you will oversee the development and dissemination of technology for external customers, vendors, and other clients to help improve and increase business.

Leadership and Strategy:

• Lead the engineering team and make strategic decisions regarding the technology stack, project management, and resource allocation.
• Establish the company’s technical vision and lead all aspects of technological development.

Development:

• Develop and maintain the front-end and back-end of web applications.
• Ensure the performance, quality, and responsiveness of applications.
• Collaborate with a team to define, design, and ship new features.

Maintenance and Optimization:

• Maintain code integrity and organization.
• Identify and correct bottlenecks and fix bugs.
• Continually work on optimizing the performance of different applications.

Security: Ensure the security of the web applications by integrating security best practices.

• Regularly update the system to protect against vulnerabilities.

Innovation:

• Research and implement new technologies and frameworks that can improve the performance and user experience of the platform.
• Stay informed on emerging technologies and trends that can potentially impact the company's products and services.

Collaboration and Communication:

• Work closely with other departments to understand their needs and translate them into technical solutions.
• Communicate technology strategy to partners, management, investors, and employees.

Project Management:

• Oversee and support project planning, deadlines, and progress.
• Ensure that the technology standards and best practices are maintained across the organization.

Mentoring and Team Building:

• Foster a culture of innovation and excellence within the technology team.
• Mentor and guide the professional and technical development of team members.

Front-End Development:

• HTML/CSS: For structuring and styling the web pages.
• JavaScript/TypeScript: Core scripting language, along with frameworks like Angular, React, or Vue.js for dynamic and responsive user interfaces.

Back-End Development:

• Python: Using frameworks like Django or Flask for server-side logic.
• Node.js: JavaScript runtime environment for building scalable network applications.
• Ruby on Rails: A server-side web application framework written in Ruby.

Database Management:

• SQL Databases: MySQL, PostgreSQL for structured data storage.
• NoSQL Databases: MongoDB, Cassandra for unstructured data or specific use cases.

Server Management:

• Nginx or Apache: For server and reverse proxy functionalities.
• Docker: For containerizing applications and ensuring consistency across multiple development and release cycles.
• Kubernetes: For automating deployment, scaling, and operations of application containers.

DevOps and Continuous Integration/Continuous Deployment (CI/CD):

• Git: For version control.
• Jenkins, Travis CI, or CircleCI: For continuous integration and deployment.
• Ansible, Chef, or Puppet: For configuration management.

Cloud Services:

• AWS: For various cloud services like computing, database storage, content delivery, etc.
• Serverless Frameworks: Such as AWS Lambda or Google Cloud Functions for running code without provisioning or managing servers.

Security:

• OAuth, JWT: For secure authentication mechanisms.
• SSL/TLS: For secure data transmission.
• Various Encryption Techniques: To safeguard sensitive data.

Performance Monitoring and Testing:

• Selenium, Jest, or Mocha: For automated testing.
• New Relic or Datadog: For performance monitoring.

Data Science and Analytics:

• Python Libraries: NumPy, Pandas, or SciPy for data manipulation and analysis.
• Machine Learning Frameworks: TensorFlow, PyTorch for implementing machine learning models.

Other Technologies:

• GraphQL: For querying and manipulating data efficiently.
• WebSockets: For real-time bi-directional communication between web clients and servers.

About the brand:

Think9 is a brand co-creation platform that transforms powerful ideas into authentic, profitable, and experience-led brands that can define the future of brands in key consumption categories like fashion and lifestyle; food and FMCG, home and decor and beauty and wellness. We are a team of experienced entrepreneurs, marquee investors, and industry professionals who have expertise and experience in building some of the most popular brands in the country. We partner with passionate entrepreneurs to combine our collective learning and experience with data science, digital ethnography, and technology platforms to build brands that connect to the new generation of Indian consumers.

What you’ll be doing?

• Working knowledge of Shopify platform, as well as exposure to application development and the use of storefront APIs to extend Shopify functionality.

• Strong knowledge of liquid programming language and experience in development and application of custom/bespoke Shopify theme and modify  the pre-existing template(s)

• Collaborating with the UX and UI design teams to produce seamless, robust, and responsive frontend user experiences

• Manage multiple projects simultaneously, and be able to address their specific needs and  requirements at a moment's notice

• Understand business needs that drive project features & functions and provide internal consultation

• Proficiency in and understanding of best practices for HTML5, CSS, JavaScript/jQuery

• Have experience in migrating the e-commerce ecosystem in Shopify, Integrating third-party systems and Shopify supported apps

• Strong understanding of the e-commerce principles and the associated technology/tools

• Comfortable using version control systems (Bitbucket/GitHub)

• The ability to use Shopify Plus features including scripts and flow to best utilize the front and backend capabilities of the Shopify platform in building, launching and maintaining Shopify web-stores

• Strong skills in MySQL, CSS, HTML5, jQuery, JavaScript, Web Services

• Knowledge of additional platforms will be a plus

• Strong Object-Oriented Programming concepts

What you’ll bring?

• Education: Bachelor's Degree in IT, Computer Science, Computer Programming, or a similar field

• 3-5 years of experience developing within the Shopify 

• 3-5 years of experience in front-end technologies including, but not limited to, JavaScript, AJAX,HTML, CSS, SASS, XML

• Strong hands-on experience in daily eComm execution and process optimization

• Interest in staying current and applying the most current best practices

• Able to work effectively in a fluid, fast-paced environment.

Experience: 5 to 6 years

Tertiary qualifications in Software Engineering.

2+ years experience in front end development using React or another JS or TS based language such as VueJS, Angular 8years.

2+ years experience in modern web design.

2+ years experience in full stack development using Python or PHP based backends.

1+ years experience microservices development.

1+ years experience with AWS Lambda, API Gateway or similar.

Understanding of OAuth or OIDC authentication flows Understanding of the OWASP Top 10 secure coding recommendations.

Exposure to basic Database Design.

Exposure to and understanding of PromQL or GraphQL, REST and SOAP.

Requirements:

Ability to work effectively in a team and independently.

Excellent English written and verbal communication skills.

Ability to multi-task and work under pressure.

Strong organizational, analytical and problem solving skills.

Ability to develop and maintain strong interpersonal working relationships with peers and customers.

Thoroughness and a high level of attention to detail.

Must be able to conceptualise systems that comprise of people, process and/or technologies and consider the broader integration perspectives.

• Must have a PHP experience, a fullstack developer will also do
• Experience - 3-6 years
• No. of vacancies - 6
• Salary - 40k-70k in hand
• B.Tech/M.Tech from any college will do

• Develop, test, and deploy fast and scalable web apps
• Designing and maintenance of fully functional large relational and non-relational databases
• Timely deployment of web apps on the cloud
• Server management and cloud-based infrastructure
• Establishment and integration of development tools as required
• Identification of application issues when deploying the apps
• App deployment on the cloud along with solving debugging issues
• Coding architecture for frontend and backend

Skills & Requirement:

• Minimum 5 years Experience required.
• Angular 2.0+, Angular 7, Nodejs, .Net 4.0, .Net Core, REST API, Micro services, Networking.
• Distributed server and storage – MongoDB & SQL Server

• Hands on experience in building web-based enterprise applications
• Good working knowledge Angular, Nodejs, .Net Core
• Understanding of cloud technologies
• Direct understanding of application lifecycle; Agile, SDLC
• Proficient in Object Oriented Programming.
• Experience with Networking Concepts.
• Good at API integration, debugging and fixing the issues with API
• Experience in performing SQL queries on a RDMS.
• Operational experience: Troubleshooting and Support
• Ability to work in groups and in independent settings to complete assigned tasks
• Previous experience on IOT Projects will be added advantage

Work Location: 1st Sector, HSR Layout, Bengaluru - 560102

Office Timings : Monday to Saturday – 9:00AM to 6:00PM

Work From Office Only