Sathish Kumar
Java Developer
Python
Kotlin
JavaScript
Node JS
PHP
SQL
Java
Security & Auth: 5/10
API Design: 4/10
Active 2 days ago
Invite to interview
Message
Download CVCV
Overview
Technical skills
Timeline
Roles
Overview
A backend API engineer (middle level) focused on building web backends and auth flows with a practical emphasis on JWT-based authentication; the main strength is implementing end-to-end auth and request handling. The strongest proven skill is authentication and API boundary handling, evidenced by JwtAuthFilter, AuthService and the Express/Mongoose auth stack in jwt-auth. There is limited evidence of production-grade scalability, secrets management, advanced data-layer optimization or comprehensive observability in the public code.
Technical skills
Python
Kotlin
JavaScript
Node JS• Middle
PHP• Middle • 3y+
SQL• Middle
Java• Middle
Kotlin
Mockito
Node JS
Express
Mongoose
Bcrypt
Java
Maven
Spring Security
Spring Boot
Hibernate
Databases
MongoDB
PostgreSQL
Oracle
MySQL
Frontend
React.js
Tailwind CSS
Bootstrap
JQuery
DevOps
CI/CD
Docker
Kubernetes
Git• 21y+
AWS
Rest API
AI/ML
Copilot
Mobile
JUnit
Cybersecurity
Fortify
SonarQube
Timeline
Systems Engineer (Java Developer)
•
Middle
Tata Consultancy Services
•
Full-Time
Developed Java/Spring Boot backend services for insurance quote-to-apply workflows, enabling real-time synchronization in high-availability environments. Built integration/adaptor functionality with a Universal Common Hub for file upload, delete, and download, using AWS IAM with SigV4 authentication, and coordinated migration issues with middleware and DevOps. Optimized Oracle SQL and automated PL/SQL-based reporting, improving dashboard load performance and reducing report turnaround time. Applied quality and security compliance using SonarQube and Fortify in Agile delivery.
Java
Spring Boot
Rest API
Oracle
SQL
AWS
SonarQube
Fortify
Web Application Developer
•
Middle
8Queens Software Development
•
Full-Time
Built a bulk email marketing tool with manual and automated modes to improve outreach effort and delivery efficiency. Integrated a face detection API for user verification in a canteen automation system. Delivered an internship management system with offer-letter automation, email acknowledgment, and attendance tracking, and implemented a payment gateway integration for an e-commerce platform. Contributed a display ads API shipped across multiple client systems.
SRM Institute of Science and Technology (ex SRM University)
Bachelor's Degree •
Computer Science
Middle Backend Developer
Confidence: Medium API Engineer
A backend API engineer (middle level) focused on building web backends and auth flows with a practical emphasis on JWT-based authentication; the main strength is implementing end-to-end auth and request handling. The strongest proven skill is authentication and API boundary handling, evidenced by JwtAuthFilter, AuthService and the Express/Mongoose auth stack in jwt-auth. There is limited evidence of production-grade scalability, secrets management, advanced data-layer optimization or comprehensive observability in the public code.
API Design
4/10
How well APIs are designed
Reasonable, consistent REST and auth boundary design with error contract handling, but missing versioning, pagination, idempotency and documented API contracts.
Evidence
smart-notes-ai/backend/src/main/java/com/smartnotes/exception/GlobalExceptionHandler.java
smart-notes-ai/backend/src/main/java/com/smartnotes/config/SecurityConfig.java
jwt-auth/controllers/authController.js
Data Layer & Database
3/10
Working with databases
Basic data-layer patterns and validation are present (ORM schemas, repository usage, migrations exist in the projects), but there is no explicit transaction management, raw-tuned queries or visible schema-evolution history in the analyzed files.
Evidence
jwt-auth/models/user.js
jwt-auth/app.js
smart-notes-ai/backend/src/main/java/com/smartnotes/service/NoteService.java
Scalability & Performance
1/10
Handling load and speed
Almost no demonstrated scalability or performance engineering: no caching/invalidation, no queueing, no rate limiting and a blocking reactive client call; basic connection usage only.
Evidence
smart-notes-ai/backend/src/main/java/com/smartnotes/service/NoteService.java
jwt-auth/app.js
System Architecture
3/10
Overall system structure
Clear multi-component layout (frontend, backend, ai-service) and separation of concerns with a gateway/client, but the decomposition is small-scale and lacks explicit inter-service contracts, resilience strategies or production-grade config management.
Evidence
smart-notes-ai/backend/src/main/java/com/smartnotes/config/SecurityConfig.java
smart-notes-ai/backend/src/main/java/com/smartnotes/service/NoteService.java
jwt-auth/app.js
Security & Auth
5/10
Protecting data and access
Authentication and authorization are implemented end-to-end (JWT, filters/middleware, password hashing) showing practical security knowledge, but there are secret-management issues and no refresh/revocation flow.
Evidence
smart-notes-ai/backend/src/main/java/com/smartnotes/security/JwtAuthFilter.java
smart-notes-ai/backend/src/main/java/com/smartnotes/service/AuthService.java
jwt-auth/middleware/authMiddleware.js
Reliability & Observability
3/10
Stability and monitoring
Basic reliability and error handling are present (centralized exception handler, input validation paths), but observability, structured logging, retries/timeouts and graceful shutdown are not demonstrated.
Evidence
smart-notes-ai/backend/src/main/java/com/smartnotes/exception/GlobalExceptionHandler.java
jwt-auth/controllers/authController.js
jwt-auth/app.js
Expertise
Java• Middle
Node.js• Middle
PHP• Middle
Technologies
Python
Java• Middle
PHP• Middle • 3y+
Kotlin
SQL• Middle
Node JS• Middle
MySQL
MongoDB
PostgreSQL
Rest API
Oracle
Maven
Express
Spring Boot
Hibernate
Bcrypt
CI/CD
Mockito
Git• 21y+
AWS
Docker
Kubernetes
Spring Security
Mongoose
Breeze• mentioned only
Laravel• mentioned only
Livewire• mentioned only
Recommendations
- Develop JWT-based auth services and user management endpoints, including refresh/revocation flows and secrets hygiene improvements.
- Implement and harden small service integrations (AI gateway calls) with timeouts, retries with backoff and non-blocking/reactive patterns.
- Harden data layer practices: add explicit migration history, transactional boundaries and instrumentation for N+1 detection.
- Build structured logging, metrics and graceful shutdown routines to improve reliability and operability.
Repositories
The developer's experience in this domain has been verified based on AI analysis of the following repositories:
Junior Frontend Developer
Confidence: Medium UI Engineer
Junior frontend UI engineer (approx 1-2 yrs) who focuses on building responsive static websites and polished marketing pages. The strongest proven skill is crafting responsive layouts and repeated UI patterns using Bootstrap and Tailwind as seen in the Bootstrap and Tailwind HTML pages. There is little evidence of non-trivial state management, automated tests, build tooling, server-side rendering, or advanced performance engineering.
UI Component Architecture
2/10
How interface parts are built
Mostly static HTML/CSS pages assembled with Bootstrap and Tailwind; no component library, design-system tokens, or custom component architecture evident.
Evidence
Web-Designing/Bootstrap/index.html: repeated card grid structure and navbar implemented in raw HTML
Web-Designing/CSs/mystyle.css: global stylesheet defining layout utilities and visual patterns
Responsive & Cross-browser
3/10
Works on all screens and browsers
Basic responsive techniques used - Bootstrap grid and Tailwind utilities plus some handcrafted media queries; no advanced fluid type, container queries, or RTL/i18n readiness found.
Evidence
Web-Designing/Tailwind/index.html: uses Tailwind responsive classes and grid (grid-cols-2, grid-cols-4)
Web-Designing/CSs/mystyle.css: media queries at min-width 769px and 1025px for .header layout
Performance Optimization
1/10
Speed of the interface
No measured performance tuning or build-time optimization; assets are loaded from CDNs but there is no code-splitting, lazy-loading, bundle analysis, or long-list virtualization.
Evidence
Web-Designing/Bootstrap/index.html: CDN-hosted Bootstrap and Font Awesome links indicate basic asset sourcing strategy
Accessibility & Semantics
2/10
Usable for everyone
Some small accessibility touches (aria attributes, alt text, keyboard handlers) exist but there is no systematic a11y strategy, automated checking, or focus management for custom widgets.
Evidence
Web-Designing/Bootstrap/index.html: offcanvas toggle includes aria-controls and aria-label
Calculator/Javascript Calculator/index.html: keyboard handlers and Enter-key handling wired to calculator functionality
State Management & Data Flow
2/10
Managing data in the app
Simple client-side state and data flow patterns are present (AJAX fetch + render, local expression parser) but no request cancellation, optimistic updates, cache invalidation, or state machines.
Evidence
Ajax-Country-Info-Table/Jquery/index.html: loadCountries uses $.ajax then displayCountries to render results
Calculator/Javascript Calculator/index.html: evaluateExpression implements tokenization and validation and explicitly checks for division-by-zero
UX & Visual Polish
3/10
Look and feel quality
UI is visually polished for static content with carousels, cards and forms; however edge states (loading/error/empty), skeletons, and undo/optimistic UX are not implemented.
Evidence
Web-Designing/Bootstrap/index.html: Bootstrap carousel and testimonial card layout
Web-Designing/Tailwind/index.html: Swiper initialization with autoplay for testimonial slides
Expertise
HTML & CSS• Junior
Technologies
Tailwind CSS
Bootstrap
React.js
JQuery
JavaScript• mentioned only
Recommendations
- Build marketing landing pages and brochure sites that require responsive layouts and cross-device polish.
- Implement small client-side features that consume public REST APIs, such as data tables and modals, where lightweight jQuery or vanilla JS is acceptable.
- Develop static prototypes and design-to-code work for small businesses using Bootstrap or Tailwind.
- Iterate on calculator or widget-style components and extend them with better input validation and accessibility improvements.
Repositories
The developer's experience in this domain has been verified based on AI analysis of the following repositories: