Open for Freelance Projects

.NET Core Expert
& Solution Architect
for Enterprise Systems

7+ years designing, building, and scaling enterprise-grade APIs, government portals, SaaS platforms, and automation systems. Currently serving at a Top Rated PSU Organisation — bringing deep domain expertise with cutting-edge technical precision.

.NET Core 8/10 API Architecture Microservices Razorpay / Stripe MySQL · Oracle · PostgreSQL React / Angular Govt Portals Social Automation Mattermost Cybersecurity SaaS
AR
Rathva Ajaykumar
Solution Architect · Full Stack Developer
📍 Vadodara, Gujarat · Top Rated PSU Organisation
7+Years Experience
15+Projects Delivered
Employee of Year
40%Perf. Boost Achieved
What I Offer

Services for Clients

End-to-end technical solutions — from architecture design to live deployment — built for scale, security, and long-term value.

01🏗️
Solution, Database & Design Architecture
Full project architecture for .NET Core systems — including solution design, database schema, ER diagrams, API layer planning, module breakdown, and technical documentation. Perfect for teams starting a new product and needing a solid foundation before a single line of code is written.
.NET CoreDB DesignArchitecture DocsER Diagrams
02🔌
API Development & Integration
RESTful & SOAP API design, microservices architecture, third-party integrations, JWT/OAuth 2.0 auth, and full Swagger documentation. Experienced in complex API migration from legacy SOAP systems to modern .NET Core architecture with zero-downtime strategies.
REST APIJWT / OAuthMicroservicesSwagger
03💳
Payment Gateway Setup — Razorpay & Stripe
Expert integration of Razorpay and Stripe in .NET Core projects. Covers one-time payments, recurring subscription plans, webhook handling, refund flows, order management, and production-ready security. If your .NET Core project needs payment integration done right, this is the service for you.
RazorpayStripeWebhooksSubscriptions
04📱
Social Media Auto-Posting System
Automated multi-platform social media engine for admin panels. One publish → auto-posts to Instagram, Facebook Page, Telegram channels/groups, and WhatsApp channels simultaneously. Uses Hangfire background job scheduling, Meta Graph API, Telegram Bot API, and dynamic image card generation for each platform.
HangfireMeta Graph APITelegram BotWhatsApp API
05💬
Team Chat Platform Setup — Mattermost
Complete setup and deployment of Mattermost — an open-source, self-hosted team messaging platform — for your company or organisation. Includes Docker-based server setup, custom branding, channel structure, SSO/LDAP integration, notification configuration, data migration, and admin training. Full data ownership, no monthly SaaS fees.
MattermostSelf-HostedSSO / LDAPDocker
06🏛️
Government & Subsidy Scheme Portals
Specialized in building secure, scalable government web portals for citizen services, subsidy scheme management, and government information systems. Covers online application workflows, multi-level officer approval pipelines, beneficiary tracking, MIS dashboards, and full compliance with government IT standards.
.NET CoreScheme MgmtCitizen PortalOracle DB
07📝
Content Management System (CMS)
Custom-built CMS solutions on .NET Core for businesses that want full control of their website without developer dependency. Manage pages, blogs, banners, announcements, media library, SEO metadata, and multi-language content through a clean admin interface. Also supports headless CMS API output for any frontend framework.
.NET CoreRich Text EditorHeadless APIMulti-language
08🛠️
.NET Core Expert — Issue Resolution
Stuck on a complex bug, architecture decision, or performance issue in your .NET Core project? Contact here. Expert diagnosis for Entity Framework Core migration errors, Quartz.NET scheduling problems, Oracle/MySQL connectivity issues, deployment failures, and API performance bottlenecks. Fast turnaround. No problem too complex.
Bug FixingEF CorePerformanceCode Review
09🛒
E-Commerce Development
Full-stack e-commerce platforms — product catalog with variants, smart filters, cart, wishlist, secure checkout, order management, discount codes, and comprehensive admin dashboard. Integrated with Razorpay or Stripe. Mobile-first, SEO-friendly, and built to scale with your business.
.NET Core MVCRazorpay/StripeAdmin PanelMySQL
Career Journey

Work Experience

Deputy Manager — Digital Technology
Top Rated PSU Organisation, Gujarat
July 2025 – Present
Leading digital technology initiatives and API-driven solutions to enhance operational efficiency and services. Collaborating with cross-functional teams to design and integrate enterprise APIs. Driving technical excellence through solution architecture, code standards, and end-to-end project lifecycle management — from requirements gathering to production deployment.
.NET CoreSolution ArchitectureAPI DesignCompliance & SecurityCI/CD
Full Stack Software Developer
Silver Touch Technologies
June 2024 – July 2025
Designed and developed scalable RESTful APIs using .NET Core Web API for government and enterprise clients. Built microservices architecture enabling seamless multi-platform integration. Implemented JWT/OAuth authentication, integrated Razorpay payment gateway, and established CI/CD pipelines using Jenkins and Git.
.NET Core Web APIMicroservicesJWT / OAuthRazorpayAngularJenkins
Software Developer
MyOnsite Healthcare Pvt Ltd
April 2022 – June 2024
Developed robust web applications and APIs using ASP.NET MVC. Designed RESTful endpoints for mobile and web integration. Integrated Apache ActiveMQ for asynchronous message processing. Participated in full Agile cycles with sprint planning and peer code reviews.
ASP.NET MVCApache ActiveMQMySQLREST APIsAgile/Scrum
Associate Software Developer
Indralok Private Limited
August 2018 – March 2022
Developed and maintained web applications using .NET MVC. Designed MySQL database schemas with focus on data integrity and performance optimization. Awarded Employee of the Year twice. Led Agile transformation initiatives significantly improving team delivery speed and project quality.
ASP.NET MVCMySQLC#GitUnit Testing
Portfolio

Key Projects

Real-world systems built across government, SaaS, automation, e-commerce, and cybersecurity domains.

GOVT🏛️
Subsidy Scheme Management System
Government of Gujarat · Citizen Services Portal

Comprehensive government web portal for managing citizen subsidy schemes end-to-end. Citizens can discover, apply, and track scheme benefits online. Government officers manage approvals, disbursements, and beneficiary records through a secure administrative portal built to handle high volumes with complete audit trails.

Citizen portal: scheme discovery, eligibility check, online application & real-time status tracking
Multi-level officer approval workflow with escalation, rejection notes & disbursement logging
Beneficiary database with document verification, Aadhaar linking & duplicate detection
Government MIS dashboards — scheme-wise utilisation, pending approvals & budget tracking
Role-based access for District, Taluka & State level officers with full audit trails
.NET Core 8Oracle DBRESTful APIJWT AuthEntity FrameworkCrystal Reports
CYBER🛡️
Silent Sentinel — Cybersecurity Platform
SaaS · Subscription-Based · Enterprise Security

Subscription-based cybersecurity monitoring product offering real-time threat detection, anomaly analysis, and security alerting for enterprise clients. Silent Sentinel operates silently in the background — continuously scanning systems and flagging suspicious activities with instant multi-channel notifications and minimal false positives.

Real-time threat detection with configurable rule engine & multi-channel alerting (email, SMS, webhook)
Tiered subscription plans (Basic / Pro / Enterprise) with Razorpay & Stripe billing
Behavioral anomaly detection using pattern matching and baseline deviation analysis
Security dashboard — incident timeline, event logs, risk scores & compliance reporting
SIEM API for integrating with third-party enterprise security platforms
.NET CoreMicroservicesSignalRSQL ServerDockerRazorpayStripe
AUTOMATION📱
Social Media Auto-Posting Engine
.NET Core · Hangfire · Multi-Platform Automation

Fully automated social media content distribution engine for admin panels. When any content is published, the system automatically generates a branded image card and simultaneously posts it to Instagram, Facebook, Telegram channels/groups, and WhatsApp channels — zero manual work required after setup.

One admin publish → simultaneous auto-posts to Instagram, Facebook, Telegram & WhatsApp
Dynamic branded image card generation (SkiaSharp) optimised for each platform's dimensions
Hangfire background job queue with retry logic, scheduling & execution monitoring dashboard
Meta Graph API, Telegram Bot API & WhatsApp Business API integrations
Post tracking — success/failure logs, reach analytics & platform-wise performance
.NET CoreHangfireMeta Graph APITelegram Bot APISkiaSharpMySQL
E-COMMERCE🕶️
OpticShop — Sunglass E-Commerce Store
Retail · Full Stack · Payment Integration

Full-stack e-commerce platform for a premium sunglasses retail brand. Features a rich product catalog with color/size/frame variants, advanced filtering, wishlist, cart, secure checkout, and a comprehensive admin panel for inventory and order management with analytics.

Product catalog with variants (color, size, frame type), smart filters & fuzzy search
Razorpay payment integration — order tracking, refund flow & invoice generation
Admin panel — inventory, order processing, discount codes & sales analytics
Customer accounts — order history, wishlists, product reviews & loyalty points
.NET Core MVCEntity FrameworkMySQLRazorpayBootstrapJavaScript
ENTERPRISE🍽️
SmartCanteen — Canteen Management System
Enterprise · Food Service · ERP Module

Digital canteen management solution for corporate and institutional environments. Replaces paper-based processes with a streamlined digital workflow — covering meal ordering, QR-based token dispensing, employee billing integrated with payroll, and inventory management.

Digital daily/weekly menu management with meal scheduling and advance booking
QR code / token-based meal validation at canteen counter with real-time status
Employee meal deduction integrated with payroll system — automated monthly reconciliation
Inventory tracking, vendor management & consumption analytics reports
.NET CoreASP.NET MVCSQL ServerEntity FrameworkjQueryCrystal Reports
CMS📝
Dynamic CMS for Business Websites
.NET Core · Web Content Management

Custom Content Management System on .NET Core for businesses wanting full website control without developer dependency. Supports pages, blogs, banners, media, announcements, and SEO settings — all manageable through a clean admin interface. Also supports headless CMS API output for modern frontend frameworks.

Rich-text page & blog editor with image upload, formatting & SEO metadata management
Media library, banner management & dynamic menu builder
Multi-language content support with role-based publishing workflows
Headless CMS REST API — integrate with React, Angular or any frontend
.NET CoreEntity FrameworkMySQLHeadless APICKEditorCloudflare R2
MIGRATION
Legacy API Migration Initiative
Enterprise · Performance · API Modernisation

Led a mission-critical migration of legacy SOAP web services to modern .NET Core RESTful API architecture for a large enterprise. Delivered 40% improvement in system performance and enabled seamless integration with modern platforms — using a zero-downtime deployment strategy.

Migrated 30+ legacy SOAP endpoints to clean RESTful APIs with zero data loss
40% improvement in API response time post-migration
Zero-downtime deployment using feature flags and canary release strategy
Full Swagger/OpenAPI documentation and automated regression test suite
.NET Core 8RESTful APISwaggerJenkinsDockerPostman
Tech Stack

Skills & Technologies

API & Backend
.NET Core Web API95%
C# / ASP.NET MVC92%
Microservices85%
Spring Boot70%
Databases
MySQL / SQL Server93%
Oracle DB84%
PostgreSQL78%
MongoDB70%
Auth & Payments
JWT / OAuth 2.092%
Razorpay95%
Stripe85%
AWS Cognito / SAML70%
Frontend & DevOps
Angular / React78%
HTML5 / CSS3 / JS85%
Git / Jenkins / Docker83%
Swagger / Postman92%
Academic Background

Education

🎓
Bachelor of Engineering — Computer Science
Gujarat Technological University (GTU)
📅 2013 – 2017  |  Vadodara, Gujarat
Foundational studies in software engineering, data structures, algorithms, database management, and computer networks — forming the analytical and architectural bedrock of 7+ years in enterprise system design and development.
Recognition

Awards & Achievements

🏆
Employee of the Year (2×)
Indralok Technologies — awarded twice for exceptional technical contributions & project delivery
40% API Performance Boost
Led legacy API migration delivering major enterprise system performance improvements
🚀
Agile Pioneer
Led Agile transformation initiatives significantly improving team productivity and delivery
🏛️
Government System Architect
Architected critical citizen-facing systems for Government of Gujarat digital services
💡
Founder — JobCharcha
Built and launched Gujarat's dedicated government job portal from the ground up
🏅
Top Rated PSU Officer
Selected as Deputy Manager at one of India's top-rated public sector organisations
Get In Touch

Let's Build Something Great

Have a project, a problem to solve, or just want to discuss an idea? Send a message — I respond within 24 hours.