You will get API integration and development (QR code/Quickbook/Crypto/Accounting)
Top Rated
Top Rated
Project details
I can create/integrate APIs (Quickbooks, QRCode, Accounting, Crypto, and many more) for your website/mobile apps successfully in a quick turnaround.
I have integrated 1000's of APIs and this project Includes the Integration or creation of any API as per your requirements.
---Programming Language I Provide for the API:---
PHP (Core, Laravel, Zend)
Asp.net
Javascript (Node/Next/Nest/Express.js)
Python (Django)
---Domains I have worked so far:---
- Crypto
Binance, BitFinex, BitMax, BitStamp, IndependentReserve, CoinAPI, Cryptobridge, SouthExchange, StockExchange
- Logistics/Shipping service provider:
UPS, USPS, FedEx, ShipRocket, Ship Station, Chitchat, AfterShip, DHL, Shippo, ShipStation for Shipment Management, etc.
- Payment API
Paypal, Stripe, GoCardLess, Checkout2Payment, Open Pay, ChargeItPro
- Third-party API integration
Huge business systems, B2B saas Applications, Inventory, Real estate Appraisal, Authorize.net, ACH Works
I also create web services for Mobile Apps. If you have any other requirements related to API do not hesitate to contact me as I am not charging for discussion :).
Note: Inbox before placing the order to discuss the requirements.
Thank you!
I have integrated 1000's of APIs and this project Includes the Integration or creation of any API as per your requirements.
---Programming Language I Provide for the API:---
PHP (Core, Laravel, Zend)
Asp.net
Javascript (Node/Next/Nest/Express.js)
Python (Django)
---Domains I have worked so far:---
- Crypto
Binance, BitFinex, BitMax, BitStamp, IndependentReserve, CoinAPI, Cryptobridge, SouthExchange, StockExchange
- Logistics/Shipping service provider:
UPS, USPS, FedEx, ShipRocket, Ship Station, Chitchat, AfterShip, DHL, Shippo, ShipStation for Shipment Management, etc.
- Payment API
Paypal, Stripe, GoCardLess, Checkout2Payment, Open Pay, ChargeItPro
- Third-party API integration
Huge business systems, B2B saas Applications, Inventory, Real estate Appraisal, Authorize.net, ACH Works
I also create web services for Mobile Apps. If you have any other requirements related to API do not hesitate to contact me as I am not charging for discussion :).
Note: Inbox before placing the order to discuss the requirements.
Thank you!
Programming Languages
PHP, JavaScript, PythonCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included $80
These options are included with the project scope.
$80
- Delivery Time 5 days
- Number of Revisions Unlimited
- Number of Pages 3
- Source Code
20 reviews
(19)
(1)
(0)
(0)
(0)
ES
Ethan S.
Mar 26, 2025
WS
Willie S.
Oct 10, 2025
Platform web development
ES
Ethan S.
Mar 26, 2025
You will get API integration and development (QR code/Quickbook/Crypto/Accounting)
RW
Ryan W.
May 18, 2022
PHP / Phinx issue resolution
Problem solved within hours of initial contract. He worked hard to find the solution, not bill me excessively. I am very happy to have found him and **will be using again**
NA
Nawal A.
Jun 30, 2021
Experienced React.js developer needed with expertise in TypeScript and Redux.
Glad to work with him. He is a great Professional with loads of Technical Knowledge.
NA
Nawal A.
Aug 17, 2020
QR code Scanner app development using React Native
With Crest Infosystems PVT. LTD. you get to pick three of the three: quality, speed, and value. The team is a delight to work with and exceptionally professional.
Highly recommended!!
Highly recommended!!
About Saurabh
Expert Full-Stack Developer | AI Agents, LLMs, RAG, SaaS, APIs
100%
Job Success
Surat, India - 6:55 pm local time
I help startups, agencies, and businesses transform ideas into production-ready products by combining Generative AI, Agentic AI, modern software architecture, AWS cloud services, and cloud-native engineering.
My expertise spans AI Agents, RAG systems, MCP integrations, intelligent workflow automation, enterprise search, document intelligence, SaaS platforms, and custom business applications.
What I Build
✅ AI Agents & Multi-Agent Systems
✅ RAG Applications & Knowledge Assistants
✅ AI Chatbots & Conversational AI Platforms
✅ MCP Servers & Tool Integrations
✅ Document Processing & Information Extraction Systems
✅ Workflow Automation & Business Process Automation
✅ AI-Powered CRM, ERP & Internal Business Platforms
✅ SaaS Products & Multi-Tenant Applications
✅ Custom Web Applications & Enterprise Software
✅ MVPs, PoCs & Production-Scale Products
♟️ 𝗔𝗜, 𝗗𝗮𝘁𝗮 & 𝗜𝗻𝘁𝗲𝗹𝗹𝗶𝗴𝗲𝗻𝗰𝗲:
→ OpenAI, GPT-4o, Claude, Gemini
→ LangChain, LangGraph & MCP
→ AI Agents & Tool Calling
→ RAG Architecture & Knowledge Retrieval Systems
→ Vector Databases & Semantic Search
→ AWS Bedrock & Enterprise AI Deployments
→ Document Intelligence
→ Prompt Engineering, AI Evaluation & Optimization
♟️ 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 & 𝗦𝘆𝘀𝘁𝗲𝗺 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴:
→ Python (FastAPI, Django), Node.js & Laravel
→ REST APIs & GraphQL
→ Microservices Architecture & Event-Driven Systems
→ Authentication & Authorization
→ Enterprise Integrations
→ Background Processing & Workflow Engines
♟️ 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱, 𝗖𝗹𝗼𝘂𝗱 & 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲:
→ React.js, Next.js & TypeScript
→ PostgreSQL, MongoDB & MySQL
→ Elasticsearch
→ AWS (Bedrock, ECS Fargate, Lambda, S3, Cognito, EC2, RDS)
→ AWS & Azure
→ Docker & CI/CD
♟️ 𝗛𝗼𝘄 𝗜 𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀:
→ Focus on business outcomes, not just technical implementation
→ Design systems that scale with future growth
→ Build maintainable, production-ready solutions
→ Communicate clearly and proactively throughout development
→ Deliver clean architecture, reliable code, and long-term value
Whether you're building an AI-native product, integrating AI into an existing platform, launching a SaaS application, automating business workflows, or developing a custom software solution, I can help you design, build, and scale technology that delivers measurable business results.
Steps for completing your project
After purchasing the project, send requirements so Saurabh can start the project.
Delivery time starts when Saurabh receives requirements from you.
Saurabh works on your project following the steps below.
Revisions may occur after the delivery date.
Timeframe and Cost finalization based on requirements
After receiving confirmation on above, I will start implementation immediately and keep you updated regarding the project status on a day-to-day basis.