Fullstack Developer

We’re building a powerful, AI-driven communication platform — a next-generation alternative to RingCentral or 8x8 — powered by OpenAI, LangChain, and SIP/WebRTC. We're looking for a Full-Stack Software Developer who’s passionate about building real-time, AI-enabled voice infrastructure and who’s excited to work in a fast-moving, founder-led environment.

This is an opportunity to build from scratch, take ownership of core systems, and innovate on the edge of VoIP + AI.

What You’ll Do

• Design and build AI-driven voice and messaging features (e.g. smart IVRs, call transcription, virtual agents)
• Develop backend services using Python, Node.js, or Golang
• Integrate OpenAI, Whisper, and LangChain with real-time VoIP systems like Twilio, SIP, or WebRTC
• Create scalable APIs, handle call logic, and build AI pipelines
• Collaborate with the founder and early team on product strategy and infrastructure
• Participate in occasional in-person strategy meetings (Delhi, Bangalore, or nearby)

Must-Have Skills

• Strong programming experience in Python, Node.js, or Go
• Hands-on experience with VoIP/SIP, WebRTC, or tools like Twilio, Asterisk, Plivo
• Experience integrating with LLM APIs, OpenAI, or speech-to-text models
• Solid understanding of backend design, Docker, Redis, PostgreSQL
• Ability to work independently and deliver production-grade code

Nice to Have

• Familiarity with LangChain or agent-based AI systems
• Knowledge of call routing logic, STUN/TURN, or media servers (e.g. FreeSWITCH)
• Interest in building scalable cloud-first SaaS products

Work Setup

• 🏠 Remote work (India-based, must be reachable for meetings)
• 🕐 Full-time role
• 💼 Direct collaboration with founder (technical)
• 🧘‍♂️ Flexible hours, strong ownership culture

Proficient in Golang, Python, Java, C++, or Ruby (at least one)

Strong grasp of system design, data structures, and algorithms

Experience with RESTful APIs, relational and NoSQL databases

Proven ability to mentor developers and drive quality delivery

Track record of building high-performance, scalable systems

Excellent communication and problem-solving skills

Experience in consulting or contractor roles is a plus

About the Company

Our client is a leading manufacturer of TMT Bar and exporter in India. They are a well known group that achieves a turn over of 3000 Cr per annum. The group is setting a construction & architecture oriented omni channel B2B & B2C platform. Merito, a curated talent platform is responsible to identify key resources for this project.

Job Location: Kolkata

Job Description

• Full stack e-commerce developer is responsible for writing reusable, testable, and efficient code
• Design and implementation of low-latency, high-availability, and performance applications 
• Implementation of security and data protection 
• Understanding of performance testing and optimization techniques 
  
  

Requirements

• Fullstack developer should have the ability to translate Wireframes and PSD Designs into functional web apps.
• Binding of UI elements to JavaScript object models
• Creating RESTful services with Node.js
• Fullstack developer must have proven experience in front & back-end development
• Work in a cross-functional team to deliver a complete user experience
• Reactjs Nodejs developer must know MongoDB, Express, Node.js, & React.
• Create Unit and Integration tests to ensure the quality of code
• Be responsive to change requests and feature requests
• Write code that is cross-platform and cross-device compatible
• Full developer must have the ability to wear many hats and learn new technologies quickly
• Understanding & proficiency in REST APIs.
• Fullstack developer should know Git Repository and Jira.

What You Need: 

✅ Strong experience in backend development using Python (Django, Flask, or FastAPI). 

✅ Hands-on experience with Azure Cloud services (Azure Functions, App Services, AKS, CosmosDB, etc.). 

✅ Experience leading a development team and managing projects. 

✅ Expertise in designing and managing APIs, microservices, and event-driven architectures. 

✅ Strong database experience with MongoDB, PostgreSQL, MySQL, or CosmosDB. 

✅ Knowledge of DevOps practices, including CI/CD pipelines, Docker, and Kubernetes. 

✅ Ability to develop Proof of Concepts (POCs) and evaluate new technology solutions. 

✅ Strong problem-solving and debugging skills. 

We are seeking a skilled Node.js Developer to join our dynamic team. The ideal candidate will have 2-3 years of hands-on experience in developing robust, scalable, and high-performance web applications using Node.js. As a Node.js Developer, you will collaborate with cross-functional teams to design, develop, and implement backend services and APIs to support our web and mobile applications. You will also be responsible for maintaining and optimizing existing codebases, troubleshooting issues, and ensuring code quality and performance.

Responsibilities:

• Develop and maintain server-side logic using Node.js
• Design and implement RESTful APIs for web and mobile applications
• Collaborate with front-end developers to integrate user-facing elements with server-side logic
• Optimize applications for maximum speed and scalability
• Implement security and data protection measures
• Troubleshoot and debug issues in production and development environments
• Conduct code reviews and provide constructive feedback to peers
• Stay updated with emerging technologies and best practices in Node.js development

Requirements:

• Bachelor's degree in Computer Science, Engineering, or a related field
• 2-3 years of professional experience in Node.js development
• Proficiency in JavaScript, including ES6+
• Experience with Express.js or similar Node.js frameworks
• Solid understanding of asynchronous programming and event-driven architecture
• Experience with relational and NoSQL databases such as MySQL, MongoDB, etc.
• Knowledge of version control systems such as Git
• Familiarity with DevOps practices and CI/CD pipelines is a plus
• Strong problem-solving skills and attention to detail
• Excellent communication and collaboration skills