You will get build a fast, documented REST API backend in Python (FastAPI)
Rising Talent
Project details
Need a fast, reliable backend or API for your app — built right?
I build clean, documented REST APIs and backends in Python (FastAPI): authentication, database models, validated endpoints, and auto-generated interactive API docs — deployed and ready for your web or mobile frontend to consume. Whether it's a new API or adding endpoints to an existing app, you get well-structured, maintainable code.
What you get:
• A documented REST API (auto Swagger/OpenAPI docs)
• Auth, database models, and validated endpoints
• Clean, typed, maintainable code
• Deployed and ready to connect to any frontend
I built InsightForge, a multi-endpoint FastAPI platform (data, scraping, AI, reports) with full interactive docs — I ship solid backends fast. Tell me what your API needs to do.
Stack: Python, FastAPI, PostgreSQL, deployed on Render.
I build clean, documented REST APIs and backends in Python (FastAPI): authentication, database models, validated endpoints, and auto-generated interactive API docs — deployed and ready for your web or mobile frontend to consume. Whether it's a new API or adding endpoints to an existing app, you get well-structured, maintainable code.
What you get:
• A documented REST API (auto Swagger/OpenAPI docs)
• Auth, database models, and validated endpoints
• Clean, typed, maintainable code
• Deployed and ready to connect to any frontend
I built InsightForge, a multi-endpoint FastAPI platform (data, scraping, AI, reports) with full interactive docs — I ship solid backends fast. Tell me what your API needs to do.
Stack: Python, FastAPI, PostgreSQL, deployed on Render.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$300
|
Standard
$900
|
Advanced
$1,800
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 18 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 5 | 12 | 25 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$80 - $250
Additional Revision
+$80
Additional endpoint
+$60
Third-party integration
+$200Frequently asked questions
About Phisit
AI Developer & LLM Security | RAG, Agents, Python/Next.js
Mueang Nonthaburi, Thailand - 7:55 am local time
Most developers can wire up a chatbot. Few can also tell you how it leaks
data, obeys a hidden instruction buried in a document, or hands one user
another user's answer. I do both.
WHAT I BUILD (Python / FastAPI and TypeScript / Next.js):
- LedgerLens - an AI bookkeeping tool with a self-audit engine that flags
fraud and anomalies. Deterministic pandas core + Claude, 33 automated tests.
- DocChat - a RAG agent that answers questions about any webpage with
grounded, cited answers.
- INKVERSE - a full content platform I built and launched solo in ~2 weeks:
authentication, PromptPay payments, an Android app, and an anti-scraping
reader. I then drove 100,000+ views to it.
HOW I SECURE AI APPS:
I red-team LLM applications against the OWASP LLM Top 10 - prompt injection
(direct and indirect), data leakage, and jailbreaks - and I write the fixes,
not just the report. Open-source tools I built:
- promptraid - an LLM prompt-injection red-team toolkit with canary-confirmed
probes across the OWASP LLM Top 10.
- raidkit - an authorized, non-destructive web vulnerability scanner.
- secure-api - a hardened FastAPI backend with a full test suite.
I found and patched a real indirect prompt-injection hole in my own RAG app,
then re-tested until it held.
If you are shipping an AI feature and want it built right, or you already have
one and want someone to try to break it before an attacker does, that is my
lane. I also take on straight full-stack and payment-integration work
(Next.js, FastAPI, Stripe / PromptPay).
I communicate clearly, work async across US, EU, and Asia hours, and I do not
disappear after delivery. Available to start now.
Steps for completing your project
After purchasing the project, send requirements so Phisit can start the project.
Delivery time starts when Phisit receives requirements from you.
Phisit works on your project following the steps below.
Revisions may occur after the delivery date.
Design endpoints
We define the resources, endpoints, and data model.
Models & auth
I set up the database models and authentication.