Rajat Chakraborty

Rajat Chakraborty

+•• ••••• •••••••••••@•••••.com

Full Stack Developer · Freelance · 3.8 yrs

As a Full Stack Developer, I am driven by a deep determination to master complex challenges, diligently pursuing innovative solutions with a high degree of autonomy. I take full accountability for delivering robust, high-quality systems, always striving for continuous improvement and impactful results.

  • Kolkata
  • Open to Bangalore · Kolkata · Delhi
  • On-site, Hybrid, Remote

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Skills

Claimed

Project Status CommunicationProduction Environment SupportTechnical DocumentationCustomer Issue ResolutionTicket ManagementCustomer Support System DevelopmentDatabase ManagementREST API Endpoint DevelopmentFreelancingAgile MethodologyEffective CommunicationTeamwork

Proof of Experience

Freelance

Full Stack Developer

Freelance · Jan 2023 – Present

DevOrbital

Software Developer Engineer

DevOrbital · Apr 2025 – Sep 2026

  • Built an asynchronous queue-based notification system using Redis queues, decoupling API alerts to deliver 50,000+ daily notifications with 99.9% uptime.
  • Optimized REST APIs and MongoDB aggregation pipelines via compound indexing and compression, cutting p95 latency by 18% (320ms to 260ms).
  • Replaced polling with full-duplex WebSocket telemetry channels, reducing live state sync latency by 65%.
  • Engineered an internal role-based access control (RBAC) admin platform, reducing operational task completion time by 35%.

Backend Developer Intern

Hello Art and Design Pvt. Ltd. · Jan 2025 – Mar 2025

  • Architected a real-time order tracking microservice for a quick-commerce app using Socket.IO room channels, reducing driver-to-customer sync latency by 40%.
  • Engineered stateless JWT authentication with bcrypt hashing and HTTP-only cookies, securing end-to-end user workflows.
  • Refactored inventory services with atomic MongoDB updates ($inc, $set), eliminating race conditions and boosting checkout throughput by 30%.

Proof-of-Work

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Proof of Education

B.Tech, Computer Science and Engineering

Dr. Sudhir Chandra Sur Institute of Technology & Sports Complex · 2022 — 2026

Class XII, Science (CBSE)

Kalyani Public School · 2020 — 2022

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