Back to Developers
Sayantan Kar

Sayantan Kar

Full Stack Engineer

Kolkata, India 0+ yrs exp 81 · Excellent

About

Solutions-oriented Full Stack Engineer with 1+ year of production experience building high-availability web applications using Java, Spring Boot, and React. Specialized in RESTful microservices architecture, relational data persistence, and JWT/RBAC security implementation. Proven track record managing 45+ technical tickets per week with root-cause analysis expertise. Experienced in CI/CD pipelines, Docker-based deployments on AWS EC2, and migrating legacy systems to Spring Boot for improved concurrency and enterprise scalability.

Skills & Expertise (25)

Node.js Intermediate
8.1/10
1
Years Exp
React.js Intermediate
8.0/10
1
Years Exp
JWT Intermediate
7.8/10
1
Years Exp
Postgresql Intermediate
7.7/10
1
Years Exp
SQL Server Root-cause analysis Scrum Agile LINUX GitHub Actions AWS EC2 Docker Core Web Vitals API Gateway OAuth2 RBAC Java MongoDb MySql .NET C# Flask Express.js Hibernate ORM Spring Boot

Work Experience

Technical Support & Web Associate

Hustly

Jan 2026 - Present

Architect and scale full-stack applications across 10+ live client environments, maintaining high-concurrency stability through zero-state infrastructure provisioning. Automate infrastructure provisioning for domain, DNS, and email systems, reducing deployment errors by 15% and eliminating manual configuration drift. Refactor backend query logic to optimize data retrieval, achieving consistent 25–30% improvements in server response times and page load speeds. Triage and resolve 45+ technical tickets weekly using root-cause analysis to address complex threading and database connection pool issues in production. Engineer resilient CI/CD pipelines with automated rollbacks and staging environments, ensuring zero-downtime during 10+ live production updates.

Full Stack Developer Intern

Unified Mentor

Sep 2025 - Dec 2025

Delivered 12+ full-stack features within Agile sprint cycles, achieving 95% on-time delivery rate from requirements analysis through QA validation. Standardized 15+ RESTful API routes using Node.js and Express.js, improving developer onboarding efficiency and long-term API maintainability. Integrated React.js frontends with Node.js microservices and PostgreSQL/MongoDB databases, ensuring transactional integrity across distributed layers. Implemented JWT authentication and RBAC authorization, achieving zero authentication regressions and 100% security test coverage. Maintained version control integrity by authoring 30+ feature branches and conducting 25+ peer code reviews to uphold code quality standards.

Education

B.Tech in Computer Science & Engineering - Dr. Sudhir Chandra Sur Institute of Technology

2021 - 2025 · Afghanistan

Certifications

No certifications added yet

Interested in this developer?

Profile Score Breakdown

📷 Photo 10/10
📄 Resume 10/10
💼 Job Title 10/10
✍️ Bio 10/10
🛠️ Skills 20/20
🎓 Education 10/10
⏱️ Experience 6/15
💰 Rate 0/5
🏆 Certs 0/5
Verified 5/5
Total Score 81/100

Profile Overview

Member sinceMay 2026

Availability Details

Relocation

Not Open to Relocation