You will get a secure REST APIs with third party integrations in 10 days
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Project details
Are you looking for a reliable backend developer to build a secure, scalable, and high-performance system for your business? I will help you turn your idea into a fully functional production ready backend solution.
š Custom pricing available for complex backend systems.
I specialize in developing REST APIs, third party integrations, authentication systems, payment gateways and optimized database architecture using modern backend technologies.
What you will get:
ā Secure and scalable REST API development
ā Authentication & authorization (JWT / OAuth)
ā Third-party integrations (payment, SMS, SaaS tools, etc.)
ā Database design and performance optimization
ā Clean, well-structured, production-ready code
ā API documentation (Swagger/OpenAPI)
ā Deployment support if needed
š” This service is ideal for mobile app backends, SaaS platforms, admin panels and automation systems.
š Please share your project requirements, features, integrations, and backend details to get started.
I am committed to delivering high quality work that ensures client satisfaction and long term system stability.
š Custom pricing available for complex backend systems.
I specialize in developing REST APIs, third party integrations, authentication systems, payment gateways and optimized database architecture using modern backend technologies.
What you will get:
ā Secure and scalable REST API development
ā Authentication & authorization (JWT / OAuth)
ā Third-party integrations (payment, SMS, SaaS tools, etc.)
ā Database design and performance optimization
ā Clean, well-structured, production-ready code
ā API documentation (Swagger/OpenAPI)
ā Deployment support if needed
š” This service is ideal for mobile app backends, SaaS platforms, admin panels and automation systems.
š Please share your project requirements, features, integrations, and backend details to get started.
I am committed to delivering high quality work that ensures client satisfaction and long term system stability.
Programming Languages
JavaScript, Python, JavaCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$280
|
Advanced
$650
|
|---|---|---|---|
| Delivery Time | 10 days | 15 days | 23 days |
Number of Revisions | 0 | 1 | 2 |
Number of Pages | 5 | 10 | 19 |
Design Customization | - | ||
Content Upload | |||
Responsive Design | |||
Source Code |
Frequently asked questions
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CL
Cortex AI L.
May 15, 2026
macOS Server Setup & Python App Deployment ā Mac Mini M4 (Step-by-Step Playbook Provided)
Hassan is AMAZING! He and his team are so skilled and polished, it is incredible. This is the best experience I have ever had with a freelancer on any platform. They recommended and flawlessly built a much more sophisticated, higher-end, more adaptable platform and engine than I could have imagined. If you need PYTHON Dev or any of their other dev skills, you don't even need to look anywhere else! World-Class all the way, I VERY HIGHLY RECOMMEND!!
LM
Lyndsey M.
Apr 22, 2026
Senior Python Backend Engineer(AI Systems & Architecture Review)
Great freelancer
VS
Vincent S.
Jan 17, 2026
Backend Engineer (Python / FastAPI, PostgreSQL)
Hassan was extremely professional, transparent, and communicative throughout the contract. He took the time to clearly explain technical decisions, risks, and possible solutions, which made it much easier to make informed choices. His experience really shows, especially in handling complex systems and planning realistic next steps. I appreciated his honesty, structure, and willingness to take ownership. Iād be happy to work with him again and recommend him to anyone looking for a reliable technical partner.
RO
Richmond O.
Dec 31, 2025
Joolju open phase
Amazing to work with. Went above and beyond
AB
Andras B.
Nov 26, 2025
Migrating RAG prototype from local machine to server
Hassan did a great job, and delivered what we agreed in time.
About Hassan
Python AI Engineer & Backend Architect | Multi-Agent SaaS, RAG
100%
Job Success
Lahore, PakistanĀ - 2:52 am local time
Most AI projects stall because developers build fragile prompt wrappers that break under real-world traffic.
As a senior AI Engineer, I specialize in building robust Python backends, autonomous multi-agent architectures, and deterministic software engines designed to run reliably at scale. My AI systems are engineered for production, not demos.
Over the past eight years, I have engineered and deployed technical systems that translate directly into business value. As a Backend Developer and AI Engineer, I designed a cross-industry MVP in 2021 for the healthcare, real estate, and fintech sectors that successfully scaled into a commercial B2B SaaS platform currently generating over $7M in recurring ROI per annum, proof that strong Python-driven architecture and disciplined AI engineering deliver real outcomes.
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ā¢ Production AI & RAG Pipelines: As a dedicated AI Engineer, I implement advanced Retrieval-Augmented Generation (RAG) pipelines using custom chunking strategies, token optimization, prompt caching, and hybrid semantic search via OpenAI and Claude APIs. Every RAG system I build is optimized for accuracy, speed, and cost efficiency.
ā¢ Autonomous Multi-Agent Systems: Multi-step orchestration workflows built with LangChain, AutoGen, and MCP (Model Context Protocol) to handle continuous background monitoring and complex data execution, core capabilities every modern Backend Developer specializing in AI must master.
ā¢ High-Performance Backend Architecture: Fast, asynchronous REST APIs engineered with Python and FastAPI, keeping your probabilistic AI outputs strictly separated from exact financial or relational database logic. Clean Python architecture is non-negotiable at scale.
ā¢ Enterprise Infrastructure & MLOps: Containerized deployments using Docker, automated Infrastructure-as-Code (IaC) via Terraform, and continuous integration pipelines with GitHub Actions across AWS and Azure AI Foundry, built to support enterprise SaaS operations end to end.
ā¢ Full SaaS Core Frameworks: Secure relational database modeling (PostgreSQL, Supabase, SQL Server), OAuth/JWT authentication (Clerk, NextAuth), and multi-tenant subscription mechanics using Stripe, the complete SaaS stack, fully production-hardened.
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ā¢ Trench-Tested Technical Ownership: Having spent over eight years working between business clients and core development teams as both AI Engineer and Backend Developer, I don't need hand-holding. I design the database schemas, analyze response latencies, and minimize api token burn rates out of the box.
ā¢ Security & Compliance Frameworks: I understand how to handle AI data pipelines under strict operational guardrails, including HIPAA compliance and PHI data protection for healthcare SaaS software, and SOC2 readiness for fintech operations.
ā¢ Clean, Enterprise-Ready Deliverables: Every Python-engineered system I deploy features comprehensive automated testing (Unit/E2E), explicit error trapping, and structured operational runbooks so your internal engineering team can scale it smoothly.
ā¢ Full-Stack Fluency: While my core domain is AI backend engineering, optimization, and MLOps, my proficiency as a Backend Developer with React and Next.js ensures absolute alignment across your front-end asset publishing and user journey layouts , critical for polished SaaS products.
Whether your platform requires deep document intelligence with RAG and OCR pipelines, local open-source model serving via vLLM and llama.cpp, or deep third-party integrations with travel GDS, WhatsApp Business, or Meta/Google Ads APIs, as your trusted Backend Developer and senior AI Engineer, I build it to last in Python.
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Steps for completing your project
After purchasing the project, send requirements so Hassan can start the project.
Delivery time starts when Hassan receives requirements from you.
Hassan works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement gathering and planning
Backend architecture and database design