Senior Full-Stack Developer

Inferno Business Solutions; Mumbai Suburban; On-site; INR 1,800,000 - 2,600,000; Full time

Job summary

Inferno Business Solutions is seeking a Senior Full-Stack Developer / Technical Expert to independently own and evolve our in-house CRM platform. You will work across backend, frontend, database, AWS, and DevOps, translating business requirements into scalable, secure technical solutions.

You will lead architecture assessment, develop backend APIs with PHP/Fat-Free, build frontend with React 18 and TypeScript, manage Redux-Saga workflows, and drive CI/CD and production deployments.

Qualifications

• Experience owning and evolving an existing CRM/codebase.
• Ability to translate business requirements into technical solutions.

Responsibilities

• Take ownership of the in-house CRM and its ongoing development.
• Assess architecture, codebase, database and integrations.
• Develop new CRM features and enhancements from business requirements.
• Improve functionality, performance, scalability and UX.
• Design and develop robust backend APIs using PHP and Fat-Free Framework.
• Work with direct mysqli-based MySQL architecture.
• Develop frontend features with React 18 and TypeScript.
• Manage state with Redux-Saga.
• Integrate third-party systems and APIs.
• Troubleshoot production issues across the stack.
• Refactor code for maintainability and performance.
• Manage deployments and production environments.
• Own AWS infrastructure and CI/CD pipelines.
• Communicate progress and decisions with stakeholders.
• Document technical standards and roadmap.

Skills

Independent working

Ownership

Full-stack capabilities

Problem-solving

Communication with stakeholders

Tools

PHP

Fat-Free Framework

MySQL

RESTful APIs

AWS

DevOps

React 18

TypeScript

Redux-Saga

Docker

CI/CD pipelines

Job description

Senior Full-Stack Developer / Technical Expert

Technology Stack: PHP, Fat-Free Framework, MySQL/mysqli, React 18, TypeScript, Redux-Saga, AWS, DevOps Experience: Senior-level, ideally 45+ years Working Model: Independent / Hands-on

About the Role

We are looking for an experienced Senior Full-Stack Technical Expert who can work independently on an existing in-house CRM platform, understand its current architecture and business processes, experience working on an equivalent production system and take ownership of enhancing and extending the platform in line with evolving business requirements.

The role requires someone who is comfortable working across the full technology stack: Backend, Frontend, Database, AWS and DevOps; and can take a requirement from initial analysis through development, testing, deployment and production support.

The successful candidate will be expected to become a key technical owner of the CRM and work closely with business stakeholders to translate business requirements into scalable, secure and maintainable technical solutions.

Key Responsibilities

• Take ownership of the existing in-house CRM and its ongoing technical development.
• Understand and assess the existing application architecture, codebase, database and integrations.
• Develop new CRM features and enhancements based on business requirements.
• Improve existing functionality, performance, scalability and user experience.
• Design and develop robust backend APIs and services using PHP and the Fat-Free Framework.
• Work with the existing direct mysqli-based MySQL architecture.
• Develop responsive and intuitive frontend functionality using React 18 and TypeScript.
• Manage application state and asynchronous workflows using Redux-Saga.
• Integrate third-party systems, APIs and external services.
• Analyse production issues and troubleshoot defects across the full technology stack.
• Review and refactor existing code to improve maintainability and performance.
• Manage application deployments and production environments.
• Take ownership of the existing AWS infrastructure supporting the application.
• Implement and maintain CI/CD pipelines and deployment processes.
• Work independently while proactively communicating progress, risks, dependencies and technical decisions.
• Work directly with business stakeholders to understand requirements and recommend appropriate technical solutions.
• Maintain technical documentation and development standards.
• Contribute to the technical roadmap and future architecture of the CRM.

Required Technical Expertise

1. Backend PHP / Fat-Free Framework / MySQL

Strong hands-on experience with:

• PHP and modern PHP development
• Fat-Free Framework (F3)
• Direct mysqli-based MySQL development
• RESTful API development
• API authentication and authorisation
• Third-party API integrations
• MySQL database design and optimisation
• Complex SQL queries
• Database indexing and performance tuning
• Data modelling and migrations
• Secure coding practices
• Error handling, logging and debugging
• Understanding and enhancing an existing PHP codebase

Important: The existing platform uses Fat-Free Framework with direct mysqli connectivity. Experience with this architecture, or the ability to work comfortably within an existing lightweight PHP framework and direct database-access model, is required.

2. Frontend – React 18 / TypeScript / Redux-Saga

Strong experience with:

• React 18
• TypeScript
• Redux
• Redux-Saga
• JavaScript / ES6+
• HTML5 / CSS3
• Responsive web application development
• Component-based architecture
• State management
• Asynchronous workflows
• REST API integration
• Form handling and validation
• Frontend performance optimisation
• Building intuitive CRM and business application interfaces

The candidate should be comfortable understanding and extending the existing React 18 + TypeScript + Redux-Saga architecture while maintaining consistency with the current codebase.

3. AWS – Current Production Environment

The candidate should have good practical hands-on knowledge of AWS and be comfortable supporting and enhancing the existing AWS environment.

Current AWS Technology Stack

The current platform is hosted using:

• Amazon EC2 – application/server infrastructure
• Apache – web server
• Amazon RDS/MySQL – database
• Amazon S3 – file/object storage
• Amazon Pinpoint – customer communication and engagement

The candidate should have practical experience with:

• EC2 configuration and troubleshooting
• Apache configuration
• RDS / MySQL connectivity and performance
• S3 integration and access management
• Pinpoint integration
• IAM and permissions
• Security Groups
• VPC and basic AWS networking
• CloudWatch monitoring and logging
• Application deployment
• Production troubleshootingBackup and recovery
• AWS security and access management

The candidate should be able to understand the existing AWS architecture, troubleshoot infrastructure and application issues, and independently deploy new functionality rather than having only theoretical AWS knowledge.

4. Future Technology / Cloud Evolution

The following technologies are not necessarily part of the current production environment but would be beneficial for the candidate to understand as potential future technologies as the platform evolves:

• Docker
• Amazon ECS
• Amazon EKS
• Kubernetes
• Containerised application architecture
• Container orchestration
• AWS ECR
• Auto Scaling
• Load Balancers
• Infrastructure as Code
• Cloud-native architecture

Experience with these technologies would be an advantage, particularly where they can support future scalability, deployment automation and modernisation of the CRM platform.

The candidate should be able to evaluate and support future technology adoption while maintaining stability and continuity of the existing platform.

5. DevOps

Practical experience with:

• Git/GitHub/GitLab
• CI/CD pipelines
• Linux
• AWS deployment environments
• Development/QA/Production environments
• Infrastructure configuration
• Application monitoring and logging
• Production support and troubleshooting
• Deployment and release management
• Backup and recovery
• Security and access management
• Knowledge of future container-based deployment using Docker, ECS or EKS would be an advantage.

Ideal Candidate

We are looking for someone who:

• Can work independently and take full ownership of technical delivery.
• Is comfortable inheriting and working with an existing CRM/codebase.
• Can understand an existing architecture quickly and identify areas for improvement.
• Has strong full-stack development capabilities.
• Has hands-on experience with PHP, Fat-Free Framework and direct mysqli.
• Has strong experience with React 18, TypeScript and Redux-Saga.
• Has solid practical AWS experience, particularly with the existing EC2, Apache, RDS, S3 and Pinpoint environment.
• Can troubleshoot issues across application, database, infrastructure and deployment layers.
• Can translate business requirements into practical technical solutions.
• Can challenge requirements constructively and recommend better approaches.
• Has strong problem-solving and analytical skills.
• Understands security, scalability and performance.
• Can work directly with non-technical business stakeholders.
• Can manage priorities and deliver without requiring constant technical supervision.
• Is pragmatic and able to distinguish between enhancing the existing platform and introducing new technologies where there is a genuine business or technical benefit.

Nice to Have

Experience in:

• CRM platforms
• Financial services/lending
• Open Banking APIs
• Payment APIs
• MicroservicesEvent-driven architecture
• Docker
• ECS / EKS
• Kubernetes
• AWS ECR
• Legacy application modernisation
• High-volume transaction processing

Overall Profile

The ideal candidate is therefore not simply a PHP or React developer. We are looking for a hands-on Full-Stack Technical Expert with strong AWS and DevOps knowledge who can independently own and evolve the entire CRM platform, while also having the technical awareness to support its future evolution towards technologies such as Docker, ECS and EKS where appropriate.