You will get API integration services (Payment/Real Estate/Inventory)
Top Rated
Project details
I provide specialized API integration services designed to seamlessly connect your systems with external platforms, enhancing functionality and streamlining operations. Whether you need to integrate payment gateways, real estate platforms, or inventory management systems, I have the expertise to deliver reliable and efficient solutions.
My approach focuses on understanding your specific business requirements, ensuring that the integration is tailored to meet your unique needs. What sets me apart is my commitment to delivering high-quality, secure, and scalable integrations that work flawlessly with your existing infrastructure. I utilize the latest technologies and industry best practices to ensure that your systems communicate effectively, reducing manual work, minimizing errors, and improving overall efficiency.
By choosing my services, you gain a partner dedicated to optimizing your workflows, enhancing user experiences, and supporting your business growth through robust API integrations. With a focus on timely delivery and ongoing support, I ensure that your integrations remain up-to-date and continue to provide value as your business evolves.
My approach focuses on understanding your specific business requirements, ensuring that the integration is tailored to meet your unique needs. What sets me apart is my commitment to delivering high-quality, secure, and scalable integrations that work flawlessly with your existing infrastructure. I utilize the latest technologies and industry best practices to ensure that your systems communicate effectively, reducing manual work, minimizing errors, and improving overall efficiency.
By choosing my services, you gain a partner dedicated to optimizing your workflows, enhancing user experiences, and supporting your business growth through robust API integrations. With a focus on timely delivery and ongoing support, I ensure that your integrations remain up-to-date and continue to provide value as your business evolves.
Programming Languages
PHP, JavaScript, PythonCoding Expertise
Localization, Performance Optimization, SecurityWhat's included $100
These options are included with the project scope.
$100
- Delivery Time 5 days
- Number of Revisions 2
- Number of Pages Mined/Scraped 5
- Number of Sources Mined/Scraped 5
- Install Script
- Test Script
- Task Automation
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SS
Samantha S.
Nov 21, 2022
Full Stack Developer for Short Term Project
Manoj delivered quality work and was a pleasure to work with. Can absolutely recommend. Thank you!
TB
Titus B.
Aug 6, 2022
Private contract
Amazing team to work with. Well skilled and great communication. Looking for a developer, look no further. Manoj Kamothi and Crest Infosystems Pvt. Ltd can handle any project big or small. Thanks again.
WG
William G.
May 17, 2022
Frontend development
A team with good skills.
DP
Dylan P.
Apr 30, 2022
Developer needed to build SaaS Web Application with React/Node/JS
NA
Nawal A.
May 19, 2020
Full stack developer needed to complete the Return module in existing ERP
Crest Infosystems PVT. LTD. ascertains quality no matter how hard they have to hit the hammer. I experienced this when I got a chance to get the development for ERP/CRM system done recently. They give new heights to the ERP/CRM system development with their client-centric solutions. Their expertise in React JS and Node JS and many other web development platforms ensure quality as well as the touch of innovation it gets. It is a great degree of pleasure for me to work with Crest Infosystems PVT. LTD.
About Manoj
Full-Stack Developer | SaaS, Shipping, ERP & AI Powered Apps
100%
Job Success
Surat, India - 1:37 pm local time
I build complex, long-running full-stack applications that businesses rely on, SaaS platforms, ERP systems, shipping integrations, and AI-powered tools, with 14+ years of backend engineering experience and a track record of multi-year client partnerships.
My longest active engagement is 2,900+ hours and still going. Clients don't just hire me once, they build with me long term.
What I Build
🔹 SaaS Platforms — Multi-tenant architecture, user dashboards, subscriptions, billing, authentication, admin panels. Built and scaled a React/Node.js SaaS platform over 2,500+ hours for one client.
🔹 ERP & CRM Systems — Custom modules, accounts management, return workflows, reporting, and full system integrations tailored to business operations.
🔹 Shipping & Logistics — Shippo, FedEx, USPS, Stripe API integrations, order management, and delivery workflow automation built on Laravel and Node.js.
🔹 Business Integrations & Automations — API-first architecture, third-party integrations, and workflow automation that connects your business systems end-to-end.
🔹 AI & NLP Features — ChatGPT/LLM integration, conversational interfaces, intelligent search, and AI-powered automation layered into web applications.
🔹 REST & GraphQL APIs — Scalable, well-documented APIs built with Node.js, Express, NestJS, and Next.js.
⚙️ Tech Stack — Node.js · Express · Next.js · NestJS · React · TypeScript . Supabase . MongoDB · PostgreSQL · MySQL · DynamoDB · Laravel · Shippo · Stripe · OpenAI APIs · Docker · CI/CD · Git
Why Clients Stay
The numbers speak: $54K SaaS build, $63K ongoing development contract, 5-star reviews across shipping portals, ERP modules, and full-stack platforms. Clients describe me as collaborative, a clear communicator, and relentlessly committed to quality, because I treat every project like a long-term partnership, not a one-off contract.
✔ I adapt to changing requirements without losing momentum.
✔ I communicate clearly with both technical and non-technical stakeholders.
✔ I deliver on time, within budget, with thorough documentation.
✔ I'm available for ongoing support, iteration, and scaling after launch.
Whether you're building a SaaS product from scratch, scaling an existing platform, or adding AI capabilities to your stack, let's talk.
📩 Message me with your project details and I'll respond promptly.
Steps for completing your project
After purchasing the project, send requirements so Manoj can start the project.
Delivery time starts when Manoj receives requirements from you.
Manoj works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Gathering
I will collaborate closely to understand the specific needs, goals, and expectations for the project. This step includes discussing the project's scope, identifying key features, and gathering any existing documentation or resources.