Headline

Full Stack MERN Developer | Backend Engineer | Node.js | NestJS | React | TypeScript | MongoDB | PostgreSQL | AWS | Docker | Immediate Joiner

About

Full Stack MERN Developer & Backend Engineer with 4+ years of professional experience design-engineering scalable web applications, robust financial engines, and real-time distributed systems. Expert at bridging responsive frontend architectures with microservices backends, focused on performance optimization and high-concurrency environments. Specialized in building end-to-end multi-tenant platforms, optimizing complex relational and NoSQL database layers, implementing secure OAuth2/RBAC authentication engines, and deploying containerized cloud infrastructures. CORE TECHNICAL STACK • Frontend Development: React, Next.js (App Router), Redux Toolkit, TypeScript, JavaScript (ES6+), Tailwind CSS • Backend & Runtimes: Node.js, NestJS, Express.js, TypeScript, Ruby (Sinatra) • APIs & Architecture: GraphQL, Apollo Federation, RESTful APIs, Microservices, WebSockets (Socket.io) • Databases & Cache: PostgreSQL, MongoDB, Redis, Prisma, TypeORM, PostGIS (Spatial Geography) • Cloud & DevOps: AWS (EC2, S3, CloudFront, Lambda), Docker, GitHub Actions (CI/CD), Nginx • Security & Auth: Keycloak OAuth 2.0, JWT, Role-Based Access Control (RBAC), Firebase Auth Open to Full Stack Engineer, MERN Developer, and Backend Engineer opportunities. Immediate Joiner | Open to Relocate to Bengaluru, Gurugram, and Hyderabad hubs. 📧 ssardar385@gmail.com | 📱 +91 9304220627

Location

Greater Bengaluru Area

AI stack

antigravity

claude code

cursor

gemini

lovable

Work experience

Independent Backend Consultant / Freelance Software Engineer at Freelance Consulting, Oct 2025 - Present · 1 yr, Sahibzada Ajit Singh Nagar, Punjab, India, Delivering scalable backend architecture, payment processing pipelines, and multi-tenant platforms for client products: ▸ HappyBoards (OMS Platform): Engineered a multi-tenant order fulfillment engine with Next.js, Node.js, Prisma, PostGIS spatial geofencing, Socket.io real-time order states, and Stripe payment webhooks. ▸ Flux Payment Service: Built high-security ACH/ICL payment processing pipelines, automated bank reconciliation logic, and Keycloak OAuth2/RBAC security using NestJS, PostgreSQL, TypeORM, and AWS S3/SFTP.

Expandimo at Expandimo Technologies Private Limited, Apr 2022 - Oct 2025 · 3 yrs 7 mos, Mohali, Designed, developed, and deployed high-performance backend services and microservices using Node.js, Express, TypeScript, MongoDB, and GraphQL, while architecting backend solutions for selected client projects.

Education

Bachelor of Technology - BTech, CSE, Swami Vivekanand Institute of Engineering & Technology, Banur

Public links

github: https://github.com/vikaskumarsardar