S
Sean Johnston
$100,000/yr

Active over a week ago


Member since Apr 2026

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Senior Fullstack Engineer

Full-Stack Engineer
Available for hire
Years of experience
12+ years
Experience level
Senior
Available for
Full-time, Part-time, Contract, Freelance
Available from
13 Jun 2026

AI & Full-Stack Developer with extensive experience designing and implementing scalable SaaS platforms, intelligent chatbots, and advanced NLP applications. Proven expertise in building secure, reliable, and production-ready systems using modern frameworks such as ASP.NET Core and Next.js. Skilled in integrating AI-driven solutions with enterprise-grade architecture to optimize user experience and operational efficiency. Strong background in real-time communications, CI/CD, and cloud deployments.

Languages

Employment History

AI & Full-Stack Developer at NextLink Labs 2021 - 2026
- Led the architecture and development of scalable multi-tenant SaaS platforms using ASP.NET Core, Next.js, and cloud-native infrastructure. - Designed and implemented advanced AI solutions including conversational agents, RAG pipelines, and NLP-driven systems for enterprise use cases. - Built secure, production-grade authentication systems JWT, MFA/OTP and ensured high availability and performance across distributed systems. - Integrated real-time communication SignalR, WebSockets) and automated workflows using tools like Zapier, Mautic, and Matomo. - Established CI/CD pipelines and deployment strategies using GitHub Actions, SonarCloud, AWS, and Azure, improving delivery speed and system reliability.
Software Engineer at Valor Software 2015 - 2020
- Developed scalable full-stack SaaS applications and intelligent automation tools across HR, healthcare, and e-commerce domains. - Built conversational AI systems and semantic search platforms to enhance user interaction and data accessibility. - Designed and implemented RESTful APIs, payment integrations, and analytics pipelines for high performance applications. - Collaborated with cross-functional and global teams to deliver end-to-end solutions from system architecture to deployment. - Optimized application performance and reliability through efficient database design, caching strategies, and scalable backend services.
Fullstack Developer at Intellectsoft 2014 - 2015
- Contributed to the development of enterprise-grade web applications using .NET, SQL Server, and modern frontend technologies. - Assisted in designing and implementing backend services and database schemas for scalable applications. - Collaborated with senior engineers to debug, test, and improve system performance and code quality. - Participated in full software development lifecycle, including requirement analysis, development, and deployment. - Gained strong foundational experience in software engineering best practices, version control, and team based development workflows.

Education

Bachelor of Computer Science at University of Central Florida 2010 - 2014