EXPLORE

API Integration Docker Java MySQL PostgreSQL
Profile cover photo
User Avatar

Sean J.

@sjohn117

5.0
5

3.1

3.1

80%

Senior AI & Full-Stack Developer

$30 USD / Hour

Flag of

United States (6:54 PM)

Joined on September 11, 2025

1 Recommendation

$30 USD / Hour

I am an AI & Full-Stack Developer specializing in building scalable SaaS platforms, intelligent chatbots, and advanced NLP solutions. My work combines strong software engineering discipline with deep AI expertise, allowing me to deliver end-to-end systems that are secure, reliable, and production-ready. 💼 What I Deliver - AI & NLP Solutions – Chatbots, AI agents, conversational platforms, semantic search, RAG pipelines, LangChain workflows - SaaS Development – Multi-tenant applications, admin dashboards, subscription systems, payment & analytics integration - Full-Stack Engineering – ASP.NET Core, Next.js, React, Node.js, MSSQL, PostgreSQL, Firebase, Supabase - Security & Scalability – Authentication (Identity, JWT, MFA/OTP), cloud deployments, CI/CD pipelines, DevOps best practices 🌍 Why Clients Work With Me ✔️ Proven track record delivering SaaS products from concept to launch ✔️ Ability to merge AI innovation with enterprise-grade architecture ✔️ Strong background in system integration & automation (APIs, workflows, real-time communication) ✔️ Professional communication and milestone-driven delivery ✔️ Focus on long-term, scalable solutions that support business growth 📌 Whether you need a custom SaaS product, an AI-powered chatbot, or an enterprise-grade NLP pipeline, I provide solutions that help businesses scale faster and work smarter. Let’s discuss your project and bring your vision to life.

Verifications

On time

100%

On budget

100%

Accept rate

55%

Portfolio

Portfolio

13585388
13585369
13585368
13585388
13585369
13585368
5.0 · 5 Reviews
Reviews
F

Phase 1 - Blockchain Verification Platform (Chainlink) $180 USD

Sean was great to work with, very knowledgeable and great communication. He delivered exactly what I requested and explained everything in a way that was easy to follow. Everything was well organized and laid out professionally. I’m really happy with the outcome and hope to work with him again in the future.

Candice D.

@Freelancerdance

Flag of

St Louis, United States

13 days ago

Share

D

Guide My ETSI OSM Setup $200 CAD

a professional person who tries to solve problems in the same moment And the same day

Djahid M.

@djahidmek

Flag of

Montreal, Canada

1 month ago

Share

M

This is an invite-only arrangement for @sjohn117 $300 USD

Professionalism & Communication!

Former Client (inactive)

Share

User Avatar

Dockerized PostgreSQL Expert – Immediate Fix + Long-Term Stability $50 USD

Sean understood the task and diligently delivered on the project. Knowledgeable, polite, trustworthy! A+ Will with with Sean again. Thanks! [15 September, 2025] Sean understood the project and quickly delivered a solution. So glad to have met. Will use in future. A+

Scott U.

@scottusl

Flag of

Corona, United States

2 months ago

Share

Experience

AI & Full-Stack Developer

Jan, 2021 - May, 2025

4 years, 4 months

NextLink Labs

Jan, 2021 - May, 2025

4 years, 4 months

- Lead developer for multi-tenant SaaS platforms (ASP.NET Core, Next.js, MSSQL, Supabase). - Built AI-powered chatbots, NLP systems, and AI agents using LangChain, RAG, and OpenAI. - Delivered secure SaaS applications with subscription models, analytics dashboards, and authentication (JWT, MFA/OTP). - Set up CI/CD pipelines with GitHub Actions, SonarCloud, and secure cloud deployments (AWS, Azure).

Flag of

Pittsburgh, United States

Jan, 2021 - May, 2025

4 years, 4 months

Software Engineer

Aug, 2015 - Oct, 2020

5 years, 2 months

Valor Software

Aug, 2015 - Oct, 2020

5 years, 2 months

- Developed custom AI solutions including conversational bots, semantic search, and automation pipelines. - Built and delivered SaaS dashboards for startups in healthcare, HR, and e-commerce. - Designed and integrated REST APIs, payment systems, and analytics into scalable full-stack platforms. - Collaborated with international teams, providing end-to-end delivery from architecture to deployment.

Flag of

Lakewood, United States

Aug, 2015 - Oct, 2020

5 years, 2 months

Junior Software Developer

Jan, 2015 - Oct, 2014

3 months

Intellectsoft

Jan, 2015 - Oct, 2014

3 months

- Worked on web applications and database systems right after graduation. - Gained hands-on experience with .NET, SQL Server, and front-end technologies. - Supported senior engineers in developing enterprise features and debugging applications.

Flag of

New York, United States

Jan, 2015 - Oct, 2014

3 months

Education

University of Central Florida

2010 - 2014

4 years

Bachelor of Computer Science

Flag of

United States

2010 - 2014

4 years

Registered Users

Total Jobs Posted

Freelancer ® is a registered Trademark of Freelancer Technology Pty Limited (ACN 142 189 759)

Copyright © 2025 Freelancer Technology Pty Limited (ACN 142 189 759)