You will get A SECURE REST API AND BACKEND FOR YOUR WEB, MOBILE, OR SAAS APP
Project details
I will build a secure, maintainable REST API and backend for your web application, mobile app, SaaS product, AI system, dashboard, booking platform, or internal business tool.
Your backend can include authentication, user accounts, role-based permissions, database design, validation, business rules, file uploads, background jobs, webhooks, third-party integrations, automated tests, documentation, and deployment configuration.
Technology is selected for your requirements and existing stack. Popular options include FastAPI, Django REST Framework, Flask, Node.js, Express, NestJS, PostgreSQL, MySQL, Redis, SQLAlchemy, Prisma, JWT, OAuth 2.0, Celery, BullMQ, Docker, OpenAPI, Pytest, AWS, Google Cloud, Azure, Render, and Railway.
You will receive organized source code, agreed API endpoints, database schema and migrations, validation, error handling, tests for agreed workflows, API documentation, an environment example, and setup instructions.
Please message me before ordering if the API must connect to an existing frontend, database, mobile app, authentication provider, legacy codebase, or production environment. Hosting and third-party service fees are not included.
Your backend can include authentication, user accounts, role-based permissions, database design, validation, business rules, file uploads, background jobs, webhooks, third-party integrations, automated tests, documentation, and deployment configuration.
Technology is selected for your requirements and existing stack. Popular options include FastAPI, Django REST Framework, Flask, Node.js, Express, NestJS, PostgreSQL, MySQL, Redis, SQLAlchemy, Prisma, JWT, OAuth 2.0, Celery, BullMQ, Docker, OpenAPI, Pytest, AWS, Google Cloud, Azure, Render, and Railway.
You will receive organized source code, agreed API endpoints, database schema and migrations, validation, error handling, tests for agreed workflows, API documentation, an environment example, and setup instructions.
Please message me before ordering if the API must connect to an existing frontend, database, mobile app, authentication provider, legacy codebase, or production environment. Hosting and third-party service fees are not included.
Web Programming Project
API Development, API IntegrationProgramming Languages
JavaScript, Python, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$399
|
Standard
$999
|
Advanced
$1,999
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 18 days |
Number of Revisions | 1 | 2 | 3 |
Source Code |
Frequently asked questions
About Shihan
AI Engineer & AI Automation Specialist | Python, FastAPI, RAG
Dhaka, Bangladesh - 7:28 pm local time
My work is Python-first and focused on practical results: reducing manual work, improving response times, connecting disconnected systems, making data more reliable, and helping teams operate more efficiently.
WHAT I CAN BUILD
• AI agents, AI assistants, chatbots, voice agents, and LLM-powered business tools
• RAG and knowledge systems that answer from approved business documents and data
• Python automation for files, reporting, data processing, content, images, web tasks, and recurring operations
• FastAPI backends, REST APIs, webhooks, background workers, scheduled jobs, and database-connected workflows
• CRM, email, calendar, payment, lead-management, reporting, marketing, and internal-process integrations
• Full-stack SaaS applications with authentication, RBAC, tenant isolation, billing, analytics, workflows, and admin controls
• ETL pipelines, data cleaning, validation, reconciliation, deduplication, scoring, dashboards, reports, and client-ready exports
• Web scraping, public-data extraction, lead discovery, enrichment, verification, outreach preparation, reply detection, and CRM delivery
• Real-time browser and telephone voice systems with recordings, transcripts, post-call analysis, and live staff supervision
• Dockerized production deployments on Linux and Ubuntu VPS with Nginx, TLS, migrations, monitoring, backups, and recovery
• Custom Tools & Software
• Api & MCP Integration
• Stripe , Paypal Payment Integration
AI AND AUTOMATION
I build provider-flexible AI systems using OpenAI, Anthropic Claude, Google Gemini, Cohere, DeepSeek, and compatible model endpoints. My AI work includes LangGraph, tool and function calling, structured outputs, conversation state, model routing, streaming, retries, guardrails, approvals, and human-in-the-loop workflows.
For RAG, I work with document extraction, chunking, embeddings, semantic search, citations, Pinecone, Qdrant, tenant filters, visibility controls, reranking, and approved-knowledge boundaries.
For voice AI, I work with OpenAI Realtime, STT–LLM–TTS pipelines, WebRTC, aiortc, Twilio, Deepgram, ElevenLabs, voice activity detection, interruption handling, recordings, transcripts, post-call workflows, and live human takeover.
SOFTWARE, DATA, AND INTEGRATIONS
My main development stack includes Python, FastAPI, SQL, PostgreSQL, Redis, SQLite, pandas, openpyxl, ReportLab, Playwright, BeautifulSoup4, RapidFuzz, React, Next.js, TypeScript, and Recharts.
I build integrations through REST APIs, webhooks, SMTP/IMAP, Telegram, WhatsApp, Google Calendar, Microsoft Outlook, Stripe, Cloudflare R2, CRM platforms, payment providers, communication services, and other third-party APIs.
PRODUCTION DELIVERY
I do more than build prototypes. I develop systems with secure authentication, RBAC, tenant separation, background jobs, retries, idempotency, rate limits, audit history, logging, health checks, database migrations, persistent storage, backups, recovery, and ongoing production support.
My deployment stack includes Git, GitHub, Docker, Docker Compose, Linux, Ubuntu VPS, Nginx, TLS, database migrations, health checks, structured logging, monitoring, and recovery procedures.
SELECTED PRODUCTS I HAVE BUILT
• VoiceAgent Studio — AI voice agents for browser and telephone conversations, lead capture, appointment booking, knowledge-based answers, CRM follow-up, payments, campaigns, and live staff supervision
• DeputyOps — AI website assistant with approved-knowledge RAG, lead capture, human takeover, CRM workflows, pending booking requests, and approval-based email automation
• DataReady Studio — data-quality software for cleaning, validating, reviewing, analyzing, and delivering reliable CSV and Excel data, native dashboards, PDF reports, and structured delivery packages
• LeadOps Studio — B2B lead-generation software for discovery, extraction, validation, scoring, human-reviewed outreach, reply detection, reporting, and CRM delivery
I have also created 200+ Python scripts and automation tools for data ingestion, file processing, validation, reporting, metadata, content, image workflows, marketplace operations, client delivery, and productivity.
You can bring me an existing manual process, a disconnected workflow, an integration requirement, a data problem, or a new AI product idea. I will help turn it into a practical, maintainable, and production-ready solution.
Steps for completing your project
After purchasing the project, send requirements so Shihan can start the project.
Delivery time starts when Shihan receives requirements from you.
Shihan works on your project following the steps below.
Revisions may occur after the delivery date.
DISCOVERY & API DESIGN
I confirm users, endpoints, data models, permissions, business rules, integrations, and the delivery plan.
BACKEND & DATABASE BUILD
I build the database structure, migrations, validation, API endpoints, business logic, and clear error handling.