Jonny Steven
Jonny Steven

AI Full Stack Developer

Open to offers · Member since 17 Aug 2026
Message
Location
Sweden
Desired salary
Unspecified
Work preference
Remote Only / Full Time
Experience level
Senior

About

Professional summary

I am an AI-focused Full-Stack Engineer with nearly eight years of experience building scalable SaaS products, cloud-native platforms, and intelligent applications.

I specialize in React, Next.js, TypeScript, Node.js, Python, and FastAPI, with hands-on experience delivering production-grade frontend and backend systems.

My AI engineering background includes OpenAI API, LangChain, Pinecone, Claude API, and Retrieval-Augmented Generation (RAG). I build intelligent systems that automate workflows, improve operational efficiency, and support document intelligence use cases.

I have designed and optimized high-volume API services, distributed cloud-native applications, and real-time experiences. My work has supported millions of annual API transactions while maintaining high availability and measurable performance improvements.

I am experienced with AWS, Docker, Kubernetes, GitHub Actions, PostgreSQL, MySQL, MongoDB, Redis, and CI/CD automation. I also implement secure authentication and access-control solutions using JWT, OAuth 2.0, and RBAC.

I work effectively in Agile/Scrum teams and collaborate closely with product managers, designers, stakeholders, and engineers to deliver scalable technical solutions on schedule.

Skills

46 capabilities

Tech stack & tools

Working toolkit

Application Hosting

Development

Experience

Career history

Full-Stack Engineer (AI Focus) Threekit

Delivered enterprise-grade full-stack applications for customer-facing and internal workflows using React, Next.js, TypeScript, Node.js, FastAPI, OpenAI API, and LLMs. Optimized web application performance, reducing page load time from 4.5 seconds to 2 seconds and increasing Lighthouse Performance scores from 68 to 92. Improved frontend responsiveness by 40% for applications serving thousands of daily users.

Built scalable backend services with Node.js, FastAPI, PostgreSQL, and REST APIs, reducing average API response time from 900ms to 400ms. Developed a RAG-powered document intelligence platform using LangChain, Pinecone, OpenAI API, FastAPI, and PostgreSQL that processed more than 50,000 documents monthly and reduced review effort by 70%. Automated workflows and reporting with Python, implemented AWS, Docker, Kubernetes, and GitHub Actions CI/CD, maintained 99.9% uptime, and implemented JWT, OAuth 2.0, RBAC, WebSockets, event-driven architecture, and streaming APIs.

Full-Stack Developer NextGen Web Solutions

Developed customer-facing web applications using React, Angular, TypeScript, and Node.js to support business operations across multiple industries. Built scalable full-stack platforms with PHP, Laravel, React, and PostgreSQL, improving application performance by approximately 30%, reducing page load times by 25%, and supporting thousands of daily users.

Developed reusable React component libraries and shared UI architecture with TypeScript to accelerate feature delivery and improve code maintainability. Designed scalable data management solutions using PostgreSQL and MongoDB, and collaborated with stakeholders to translate business requirements into technical deliverables.

Back-End Developer Innovatech

Developed backend services and REST APIs using Node.js, Express.js, and Java for high-availability web applications. Engineered scalable services with Python and Node.js that processed more than one million API requests annually while reducing average response times by approximately 25%.

Optimized MongoDB and MySQL performance through indexing, query tuning, and schema improvements. Standardized development and deployment processes with Docker, improving environment consistency and release reliability, and contributed to backend architecture and production performance optimization initiatives.

Education

Learning history

Saxion University of Applied Sciences

B.Sc., Computer Science

Bachelor of Science in Computer Science.

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