Senior Software Engineer

Job Description

About AiSensy AiSensy is a WhatsApp based Marketing & Engagement platform helping businesses like Adani, Delhi Transport Corporation, Yakult, Godrej, Aditya Birla Hindalco, Wipro, Asian Paints, India Today Group, Skullcandy, Vivo, Physicswallah, and Cosco grow their revenues via WhatsApp. Enabling 100,000+ Businesses with WhatsApp Engagement & Marketing 400 Crores+ WhatsApp Messages exchanged between Businesses and Users via AiSensy per year Working with top brands like Delhi Transport Corporation, Vivo, Physicswallah & more High Impact as Businesses drive 25-80% Revenues using AiSensy Platform Mission-Driven and Growth Stage Startup backed by Marsshot.vc, Bluelotus.vc & 50+ Angel Investors As a Senior Software Developer at AiSensy, you will play a key role in building scalable, high-performance systems to power real-time communication and large-scale marketing automation. You’ll work closely with product managers, frontend developers, and DevOps to architect reliable backend services that scale seamlessly and perform under heavy load. This is a high-impact opportunity to shape the backend infrastructure of one of India’s fastest-growing SaaS platforms. Key Responsibilities: System Design & Scalability: Design and implement distributed systems that can process millions of daily WhatsApp messages. API Development: Develop and maintain RESTful APIs for web and mobile applications, ensuring speed and security. Backend Architecture: Write efficient, modular, and reusable code in Node.js with Express.js. Database Management: Build and optimize MongoDB schemas and queries for scalability, reliability, and performance. Performance Optimization: Identify and fix bottlenecks in performance, memory, and latency through monitoring and refactoring. Security & Compliance: Implement data security and protection best practices throughout backend services. DevOps Collaboration: Work with DevOps to ensure robust CI/CD pipelines and cloud infrastructure (AWS, Docker, etc.). Team Collaboration: Collaborate with frontend, product, and QA teams to ship features rapidly without compromising stability. Code Quality: Participate in peer reviews, write clean documentation, and follow development standards. Qualifications: Must-Haves: 5+ years of overall software development experience, with 3+ years in backend development using MERN stack. Strong proficiency in Node.js, Express.js, MongoDB, and REST API development. Deep understanding of asynchronous programming, promises, and event-driven architectures. Hands-on experience with Git, Docker, and AWS-based deployments. Solid understanding of data modeling, indexing, and performance optimization in MongoDB. Experience with production-level systems handling large volumes of traffic and users. Familiarity with logging, monitoring, and debugging tools for backend systems. Excellent problem-solving skills and strong communication abilities. Nice-to-Haves: Experience with Redis, message brokers (like RabbitMQ), or pub/sub systems. Understanding of WebSockets or real-time data pipelines. Knowledge of container orchestration tools like Kubernetes. Exposure to GraphQL or serverless technologies. Experience working in fast-paced SaaS product teams. Why AiSensy? At AiSensy, we’re on a mission to revolutionize how businesses communicate with their customers through WhatsApp Marketing. We’re a close-knit, ambitious team that thrives on creativity, experimentation, and impact. We offer: A fast-paced, growth-oriented work environment. Opportunities to work on large-scale, real-time backend systems. A product-focused engineering culture with real ownership and autonomy. An open culture that encourages collaboration, learning, and innovation. Ready to Build the Future? Join AiSensy and help us architect powerful, scalable backend systems that redefine business-to-customer communication. Show more Show less