Senior Full Stack Developer

Proof of Skill; Mumbai; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Proof of Skill in Mumbai is seeking a highly skilled Senior Full Stack Developer to build scalable, high-performance web applications. You will work across frontend and backend, crafting systems with Next.js, Node.js, and modern databases.

You will design APIs, optimize queries, implement caching with Redis, and explore vector databases for AI-powered features. Collaboration with product and engineering teams, code reviews, and mentoring are part of the role.

Qualifications

• 4-5 years of experience in full-stack software development.
• Hands-on Next.js experience.
• Backend experience with Node.js and Express.js.
• Strong SQL databases knowledge (PostgreSQL/MySQL).
• Experience with NoSQL databases (MongoDB or similar).
• Hands-on Redis experience.
• Experience with vector databases (Pinecone, Weaviate, Qdrant).
• Strong REST API and system design understanding.
• Familiar with Git and CI/CD workflows.
• Excellent debugging and problem-solving skills.

Responsibilities

• Design, develop, and maintain scalable full-stack applications.
• Build responsive UIs with Next.js.
• Develop backend APIs and microservices using Node.js/Express.
• Design and optimize relational and NoSQL database schemas.
• Implement caching strategies using Redis to boost performance.
• Work with Vector Databases to build AI-powered features.
• Collaborate with product managers, designers, and engineering teams to deliver features.
• Troubleshoot production issues and optimize performance.
• Mentor junior engineers and participate in code reviews.

Skills

Next.js

Node.js

Express.js

SQL databases

NoSQL databases

Redis

Vector Databases

REST APIs

Git

CI/CD

Debugging

Tools

Docker

Kubernetes

AWS

Job description

About the Role

We are looking for a highly skilled Senior Full Stack Developer with strong experience in building scalable, high-performance web applications. The ideal candidate should have expertise across modern frontend and backend technologies, database design, caching, and AI-powered data systems. You will work closely with cross-functional teams to design, build, and deploy production-grade applications.

Key Responsibilities

• Design, develop, and maintain scalable full-stack applications.


• Build responsive and performant user interfaces using Next.js.


• Develop robust backend APIs and microservices using Node.js and Express.js.


• Design and optimize relational and NoSQL database schemas.


• Implement caching strategies using Redis to improve application performance.


• Work with Vector Databases to build AI-powered search, recommendation, or RAG-based features.


• Write clean, maintainable, and well-tested code following best practices.


• Collaborate with product managers, designers, and engineering teams to deliver high-quality features.


• Troubleshoot production issues and optimize application performance.


• Participate in code reviews and mentor junior engineers.

Required Skills

• 4-5 years of experience in full-stack software development.


• Strong hands-on experience with Next.js.


• Strong backend development experience with Node.js and Express.js.


• Solid understanding of SQL databases (PostgreSQL/MySQL).


• Experience with NoSQL databases (MongoDB or similar).


• Hands-on experience with Redis.


• Experience working with Vector Databases (Pinecone, Weaviate, Qdrant, Milvus, ChromaDB, or similar).


• Strong understanding of REST APIs and system design principles.


• Familiarity with Git and modern CI/CD workflows.


• Excellent debugging and problem-solving skills.

Good to Have

• Experience with AI/LLM applications and Retrieval-Augmented Generation (RAG).


• Knowledge of Docker, Kubernetes, or cloud platforms (AWS/GCP/Azure).


• Experience with message queues or event-driven architectures.


• Understanding of security and performance optimization best practices.

What We Are Looking For

• Strong ownership mindset and attention to detail.


• Excellent communication and collaboration skills.


• Ability to work in a fast-paced, product-focused environment.


• Passion for building scalable, reliable, and high-quality software.

Work Location: Mumbai (On-site)
Work Schedule: 5 Days a Week (Work from Office)