fastapier (Freelance Backend)

FastAPI backend engineer | JWT, payments, AI integration Fixing broken auth and API issues across Docker and production. Building APIs for SaaS and internal tools.

Japan Joined on Feb 20, 2026 fastapienne@gmail.com https://github.com/hiro-kuroe

Work

FastAPI Backend Engineer (Freelance)

fastapier (Freelance Backend)

Apr 19

I added profile-specific duplicate rules to my CSV intake console #5

#fastapi #python #csv #webdev

2 min read

fastapier (Freelance Backend)

Apr 19

I added company-specific CSV import profiles to my intake console #4

#fastapi #python #csv #webdev

2 min read

fastapier (Freelance Backend)

Apr 18

I added a blocked-row remediation loop to my CSV intake console #3

#fastapi #python #csv #webdev

4 min read

fastapier (Freelance Backend)

Apr 18

I added a blocked-row remediation loop to my CSV intake console

#fastapi #python #csv #webdev

4 min read

fastapier (Freelance Backend)

Apr 18

From CSV Import Demo to CSV Triage Console #2

#fastapi #python #csv #webdev

5 min read

fastapier (Freelance Backend)

Apr 17

From CSV Import Demo to CSV Triage Console

#fastapi #python #csv #webdev

5 min read

fastapier (Freelance Backend)

Apr 17

From CSV Import Demo to CSV Triage Console

#fastapi #python #csv #webdev

5 min read

fastapier (Freelance Backend)

Apr 15

Your CSV Import Is Fine... Until Real Data Arrives #1

#fastapi #python #nextjs #csv

10 min read

fastapier (Freelance Backend)

Mar 25

Building a Production-Aware AI Backend with FastAPI

#fastapi #python #ai #openai

4 min read

fastapier (Freelance Backend)

Mar 18

Building a Production-Ready AI Backend with FastAPI and OpenAI

#fastapi #openai #ai #saas

2 min read

fastapier (Freelance Backend)

Mar 8

Building a Stripe Subscription Backend with FastAPI

#fastapi #stripe #python #webdev

3 min read

fastapier (Freelance Backend)

Feb 21

401 Is Not the Bug. It’s the Signal.

#fastapi #jwt #authentication #python

1 min read

fastapier (Freelance Backend)

Feb 20

Your API Is Replying… But Authentication Is Already Broken (FastAPI JWT)

#fastapi #python #jwt #docker

1 min read

DEV Community

fastapier (Freelance Backend)

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I added profile-specific duplicate rules to my CSV intake console #5

I added company-specific CSV import profiles to my intake console #4

I added a blocked-row remediation loop to my CSV intake console #3

I added a blocked-row remediation loop to my CSV intake console

From CSV Import Demo to CSV Triage Console #2

From CSV Import Demo to CSV Triage Console

From CSV Import Demo to CSV Triage Console

Your CSV Import Is Fine... Until Real Data Arrives #1

Building a Production-Aware AI Backend with FastAPI

Building a Production-Ready AI Backend with FastAPI and OpenAI

Building a Stripe Subscription Backend with FastAPI

401 Is Not the Bug. It’s the Signal.

Your API Is Replying… But Authentication Is Already Broken (FastAPI JWT)