I will build a full stack web app or saas with react and fastapi

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Oleksii B
build a full stack web app or saas with react and fastapi
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build a full stack web app or saas with react and fastapibuild a full stack web app or saas with react and fastapibuild a full stack web app or saas with react and fastapibuild a full stack web app or saas with react and fastapi

About this gig

Need a web app that actually ships not a half-built prototype you'll spend months fixing?


I build full-stack products end-to-end: frontend, backend, database, auth, payments, DevOps. Real production systems, not demos.


WHAT I'VE SHIPPED:

- Led a 10-engineer team on a white-label derivatives trading platform: real-time WebSocket pricing, Stripe + crypto payments, KYC, CRM ~10,000 concurrent users at peak

- Geo-social platform: real-time chat, Google Maps, Stripe subscriptions, 18 domain models

- SaaS client portal: encrypted storage, 2FA, billing pipeline, automated tests


WHAT I BUILD:

- SaaS platforms with subscriptions, user roles, admin panels

- REST APIs with auth (JWT, OAuth 2.0, 2FA)

- Real-time features (WebSocket, notifications)

- Payment integration (Stripe)

- Full production setup (Docker, Nginx, CI/CD)


TECH STACK:

Frontend: React 19, Next.js 16, TypeScript, Tailwind CSS

Backend: FastAPI, Django, Node.js

Database: PostgreSQL, Redis, MongoDB

DevOps: Docker, GitHub Actions


Not sure which package fits? Message me first.

  • Programming language

    • Python

  • Expertise

    • Debugging
    • Performance
    • Security
    • Design
    • Databases

  • Frontend framework

    • Bootstrap
    • Next.js
    • React.js
    • Tailwind CSS
    • Vue.js

  • Backend framework

    • Django
    • FastAPI
    • Laravel
    • Next.js
    • Node.js

Get to know Oleksii B

Oleksii B

FullStack AI Engineer

  • FromLatvia
  • Member sinceNov 2023
  • Avg. response time1 hour

  • Languages

    English, Russian, Ukrainian, Latvian
I am a Full-stack & AI engineer who ships production systems end-to-end, from LangGraph multi-agent backends to React and Next.js frontends. I have experience building production multi-agent GenAI systems on the Azure AI stack and leading engineering teams to deliver high-traffic white-label trading platforms with zero downtime.

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Other Software Development Services I Offer

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