You will get Secure backend APIs and integrations for your SaaS App | .NET & Node.js
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Project details
đ SECURE BACKEND API DEVELOPMENT & API INTEGRATION
A great SaaS application starts with a reliable backend.
I help businesses build secure REST APIs, backend modules, API integrations, and scalable web applications using Node.js, ASP.NET Core, C#, and modern database systems like PostgreSQL, MongoDB, and SQL Server.
âď¸ Perfect For
â Backend API Development
â SaaS Development
â REST APIs & API Integration
â Admin Dashboards
â Business Process Automation
â Workflow Automation
â Customer Onboarding Automation
â Payment, notification, or external API integrations
đ§ What I Build
âď¸ Secure REST APIs
âď¸ Authentication and role-based access
âď¸ Database design and backend architecture
âď¸ Third-party API integrations
âď¸ Payment, notification, or external service integrations
âď¸ Workflow automation and business logic
âď¸ Validation, error handling, and clean API responses
đĄ Why Work With Me
đ Clean, maintainable code
đ Secure and scalable backend structure
đ Clear communication and updates
đ Support from planning to production launch
Whether you need a new API, backend module, API integration, or complete SaaS backend system, I can help build the right foundation.
A great SaaS application starts with a reliable backend.
I help businesses build secure REST APIs, backend modules, API integrations, and scalable web applications using Node.js, ASP.NET Core, C#, and modern database systems like PostgreSQL, MongoDB, and SQL Server.
âď¸ Perfect For
â Backend API Development
â SaaS Development
â REST APIs & API Integration
â Admin Dashboards
â Business Process Automation
â Workflow Automation
â Customer Onboarding Automation
â Payment, notification, or external API integrations
đ§ What I Build
âď¸ Secure REST APIs
âď¸ Authentication and role-based access
âď¸ Database design and backend architecture
âď¸ Third-party API integrations
âď¸ Payment, notification, or external service integrations
âď¸ Workflow automation and business logic
âď¸ Validation, error handling, and clean API responses
đĄ Why Work With Me
đ Clean, maintainable code
đ Secure and scalable backend structure
đ Clear communication and updates
đ Support from planning to production launch
Whether you need a new API, backend module, API integration, or complete SaaS backend system, I can help build the right foundation.
Programming Languages
JavaScript, ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$200
|
Standard
$600
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 20 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 2 | 5 | 10 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | ||
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$100
Third-Party API Integration
(+ 7 Days)
+$250
Admin Dashboard APIs
(+ 5 Days)
+$300
Deployment Setup on Azure/AWS
(+ 5 Days)
+$300
2 reviews
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Mirza B.
Aug 16, 2026
.NET Core Developer Needed for E-Commerce Authentication, Authorization & API Refactoring
She did a great job on our ASP.NET Core backend. She implemented authentication, Google sign-in, role-based authorization, customer onboarding, and refactored our existing APIs for better validation, error handling, logging, and maintainability. She has strong experience with .NET, REST APIs, backend workflows, and integrations. Communication was clear and consistent throughout the project, she kept us updated on progress, and was very reliable with delivery
TS
Trey S.
Jul 21, 2026
Back end for real estate platform
Excellent freelancer. Worked on a project for quite a while that went in a different direction. I would recommend this developer to anyone who needs someone who is absolutely intelligent and a great mind for detail. Helped us get a project going and handled a wide range of tasks from architecture to bug resolution. Great job also with team cohesion and communication. A+ I'd recommend to anyone.
About Aqsa
CRM & SaaS Workflow Automation Developer | .NET Core, Node.js, React
100%
Job Success
Lahore, Pakistan - 10:17 am local time
They need better systems.
When CRM workflows, onboarding, approvals, reporting, payments, and operations still rely on spreadsheets, emails, WhatsApp messages, and manual follow-ups, growth becomes slow, expensive, and difficult to manage.
đ§đľđŽđâđ đđľđ˛đżđ˛ đ đ°đźđşđ˛ đśđť.
Iâm a CRM, SaaS, and workflow automation developer specializing in CRM automation, business process automation, API integration, backend API development, scalable web applications, and reporting dashboards.
My advantage is that I combine software development with CRM automation. I can build backend APIs, frontend layouts, dashboards, user portals, and internal tools from scratch, then connect them with CRMs, automation tools, and third-party systems.
I help B2B & B2C startups, SaaS companies, service businesses, and growing teams turn manual processes into secure, structured, and scalable systems using React, TypeScript, ASP.NET Core, C#, Node.js, PostgreSQL, Azure, AWS, and modern automation tools.
đ I donât just build applications â I solve operational bottlenecks that slow businesses down.
đ˘ đŁđżđźđđ˛đť đđşđ˝đŽđ°đ
â Built fintech and SaaS platforms supporting $đ˛đ + đśđť đłđđťđąđśđťđ´ đźđ˝đ˛đżđŽđđśđźđťđ
â Helped launch lending platforms that disbursed $đąđŹđŹđ+ đđśđđľđśđť đđśđ đşđźđťđđľđ
â Reduced manual work by đ˛đŹ% đđľđżđźđđ´đľ đđźđżđ¸đłđšđźđ đŽđđđźđşđŽđđśđźđť
â Completed a đłđŹđŹ+ đľđźđđż đŻđŽđ°đ¸đ˛đťđą đąđ˛đđ˛đšđźđ˝đşđ˛đťđ đ˛đťđ´đŽđ´đ˛đşđ˛đťđ with a 5-star review
â đđšđśđ˛đťđ đđ˛đ˛đąđŻđŽđ°đ¸
"I would recommend this developer to anyone who needs someone who is absolutely intelligent and a great mind for detail. Helped us get a project going and handled a wide range of tasks from architecture to bug resolution. Great job also with team cohesion and communication."
đ˘ đŞđľđŽđ đ đŚđ˝đ˛đ°đśđŽđšđśđđ˛ đđť
âď¸ CRM, Workflow & Business Process Automation
CRM automation and workflow automation systems for lead management, customer follow-ups, approvals, reminders, internal operations, reporting, and repetitive business processes.
âď¸ SaaS Applications, Admin Dashboards & Onboarding
Full-stack development for SaaS applications, admin dashboards, customer onboarding automation, user portals, reporting modules, internal tools, and scalable web applications.
âď¸ API Integrations & Third-Party Systems
Integrating CRMs, ERPs, payment gateways, verification services, communication tools, reporting systems, and external platforms using REST APIs and custom backend services.
âď¸ CRM Platforms & Automation Tools
Working with HubSpot, GoHighLevel, Odoo CRM, Zapier, n8n, and other third-party tools to automate CRM updates, lead routing, customer communication, data sync, reminders, and follow-ups
âď¸ Scalable Backend Architecture & API Development
Building secure backend APIs, dashboards, integrations, and automation systems using ASP.NET Core, C#, Node.js, TypeScript, SQL Server, MongoDB, PostgreSQL, Redis, Azure, and AWS.
âď¸ Fintech Platform & Payment Automation Workflows
Building fintech SaaS solutions for lending, customer verification, payment tracking, installment workflows, repayment management, automated reminders, and financial dashboards.
đ˘ đŞđľđŽđ đ đŽđ¸đ˛đ đ đ˛ đđśđłđłđ˛đżđ˛đťđ
âď¸ Workflow-first system architecture
âď¸ Strong ASP.NET Core, C#, Node.js, and REST API experience
âď¸ Ability to connect CRMs, third-party APIs, and internal systems
âď¸ Experience with scalable SaaS applications and admin dashboards
âď¸ Focus on reducing manual work and operational friction
âď¸ Clean communication and structured development
âď¸ Long-term thinking beyond initial MVP delivery
đ˘ đ§đ˛đ°đľ đŚđđŽđ°đ¸ & đ§đźđźđšđ
đđżđźđťđđ˛đťđą: React, Angular, Next.js, TypeScript
đđŽđ°đ¸đ˛đťđą: ASP.NET Core, C#, .NET Core, Node.js, Express.js, NestJS, MERN Stack
đđŽđđŽđŻđŽđđ˛đ: PostgreSQL, SQL Server, MongoDB, MySQL, Redis
đđđđźđşđŽđđśđźđť & đđĽđ : HubSpot, GoHighLevel, Odoo, Zapier, n8n, CRM automation, workflow automation
đđšđźđđą: Azure, AWS
đđąđąđśđđśđźđťđŽđš: REST APIs, third-party integrations, payment gateway integrations, Stripe, customer onboarding automation
đ˘ đđ˛đâđ đ§đđżđť đ đŽđťđđŽđš đŞđźđżđ¸ đđťđđź đŚđ°đŽđšđŽđŻđšđ˛ đŚđđđđ˛đşđ
Most clients come to me with disconnected tools, inefficient processes, CRM data spread across multiple systems, or backend platforms that are becoming difficult to maintain.
I help turn that operational complexity into reliable software that saves time, reduces errors, improves visibility, and supports long-term growth.
đŹ Send me a message with your current workflow, CRM setup, SaaS platform idea, or backend challenge.
We can discuss the problem and determine the most practical path forward.
Steps for completing your project
After purchasing the project, send requirements so Aqsa can start the project.
Delivery time starts when Aqsa receives requirements from you.
Aqsa works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & API Planning
Review SaaS requirements, business workflow, API needs, integrations, and data flow.
Architecture & Database Design
Design scalable backend architecture, database schema, REST APIs, and auth flow.