You will get a Next.js developer and full stack developer for full stack web development
Top Rated
Project details
I'm a Next.js developer and full stack developer working in React, Next.js, Node.js, TypeScript, and Python. I build web applications and SaaS platforms end to end, from a fast Next.js front end through REST API integration, user authentication, and role-based access control. On data I use PostgreSQL, MongoDB, Redis, Supabase, and Firebase, with solid database architecture and caching so your app stays quick as traffic grows. I handle cloud deployment on AWS, GCP, and Azure, set up CI so releases stay boring and safe, wire in webhooks and payments, and I can add AI features or a React Native mobile app when your product needs them. Across 140+ projects in EdTech, HealthTech, and enterprise SaaS, I've shipped HIPAA and GDPR compliant systems and real-time data platforms, so I know where apps break and how to keep yours maintainable past launch day. I'll flag risky choices early instead of surprising you later. What you get: a working web app, clean documented code, and steady updates while I build.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Security, DesignWhat's included $6,500
These options are included with the project scope.
$6,500
- Delivery Time 10 days
- Number of Revisions 0
80 reviews
(80)
(0)
(0)
(0)
(0)
This project doesn't have any reviews.
RK
Reuben K.
Jun 22, 2026
Senior Full Stack Developer React Node.js AI App
EB
Ellen B.
Jun 17, 2026
Backend Development for Zendesk-based Customer Support RAG System
SM
Stephanie M.
Jun 16, 2026
EdTech Senior Full Stack Developer Node.js React
OT
Oleh T.
Jun 3, 2026
Full Stack Developer / Back End Developer Consultation – React Native / Next.js / Node.js
Great experience working with Slavik. We needed a consultation from a full-stack developer with strong JavaScript knowledge (React, Node.js, React Native) to help our team with architecture planning for a SaaS travel application. Since we have plans for both a web app and mobile, we needed to think through the right system design in advance. Slavik showed strong back end and full stack development experience, asked all the right questions, and caught a few things we hadn't accounted for that could've become bottlenecks later.
Communication was also super clear and collaborative throughout.
I'd be happy to continue into the next phase with Slavik and his team when the time comes.
Communication was also super clear and collaborative throughout.
I'd be happy to continue into the next phase with Slavik and his team when the time comes.
SM
Stephanie M.
May 22, 2026
Full Stack Developer for Kids’ Voice AI Storytelling App (GDPR-Compliant) - React & Node.js
About Slavik
Full Stack Developer React Node.js | API Integration | SaaS & EdTech
100%
Job Success
Vinnytsya, Ukraine - 1:12 am local time
I help founders and teams turn an idea or a prototype into a production SaaS platform that actually ships and gets used.
❇️Projects I'm proud of:
💡 An adaptive SAT/ACT preparation platform built with React, Node.js, and Python, powered by the OpenAI API and developed with input from Stanford PhDs - it turns raw practice scores into a learning path that adjusts after every session.
💡A RAG-powered document search tool, built with Python and LangChain and connected straight into SharePoint and Dynamics 365, that indexed 300,000+ internal files and cut research time by 75%.
💡A HIPAA-compliant AI note-taking tool, built with Node.js and Whisper on a secure cloud backend, that turns a psychiatrist's spoken session straight into a structured clinical note - saving hours of their paperwork time daily.
💡A voice-controlled drive-thru ordering system, built with React Native and Node.js, now running in real locations and cutting order processing time by 30%.
💡A GDPR-first Zendesk AI copilot, built with Node.js and the OpenAI API with a custom data-scrubbing pipeline, that drafts agent replies from ticket history while stripping sensitive customer data before it ever touches the AI model.
✅How I work with clients
I'm direct and to the point - you'll get plain answers on scope, cost, and timeline, and if something in your plan won't work, I'll say so early, not after the invoice. I think about your project with a business mindset first: what needs to ship, what it needs to earn or save you, and what can wait - not just what's technically fun to build. No jargon dumps, no vague "it's in progress" updates.
Full Stack Development Across Every Stack
As a Full Stack Developer Python and Python Full Stack Developer, I build AI backends with Django, FastAPI, and Flask alongside React frontends. As a Full Stack Developer React and Full Stack Developer React Node, my default stack for new SaaS builds is React/Next.js + Node.js and TypeScript. As a Full Stack Developer AI, I fold LLM and RAG features directly into that same codebase instead of bolting them on as a separate service - working with OpenAI, Anthropic Claude, Gemini, Mistral, and Llama models, orchestrated through LangChain, with vector databases like Pinecone and Elastic Search grounding responses in real data instead of guesses. Where a project needs voice, I bring in Whisper, ElevenLabs, and VAPI for speech-to-text and real-time voice AI, and I build autonomous AI agents and multi-step workflows using tools like Hugging Face and PyTorch when custom model work is called for.
Most of what I build mixes full-stack web with AI: RAG systems, agents, chatbots, voice apps. For projects on a different foundation, I work as a Full Stack developer PHP and Full Stack Developer Laravel on legacy systems or client-mandated stacks, and as a WordPress Full Stack developer when a CMS site needs custom functionality beyond themes and plugins. I've also worked as a Webflow developer for fast, no-CMS-overhead marketing sites and landing pages.
Whether you need a Full Stack Web Developer for a browser-first product or a Full Stack app developer for something React Native-based on mobile (with Swift and Kotlin where a fully native module is needed), I own the project front-to-back - design, build, ship, and support. On the data and infrastructure side, I work with PostgreSQL, MongoDB, MySQL, and Supabase, deploy on AWS, Microsoft Azure, and Google Cloud Platform, and build with compliance in mind from day one - HIPAA, GDPR, SOC 2, and PCI-DSS - for HealthTech, EdTech, and enterprise SaaS clients who can't afford to get that part wrong.
🟢If your project needs someone who'll own it end to end, send over what you've got - idea, spec, or prototype - and let's see if we're a fit.
Steps for completing your project
After purchasing the project, send requirements so Slavik can start the project.
Delivery time starts when Slavik receives requirements from you.
Slavik works on your project following the steps below.
Revisions may occur after the delivery date.
Message me to discuss the scope and roadmap.