You will get React | Python | AI | JS developer Consultation
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Project details
When you choose to work with me, you gain access to an experienced developer with over 16 years of expertise in web development. I specialize in React.JS, FastAPI, Django, and AI, ensuring that all your needs are met, whether it's for a short-term consultation or a long-term project.
Feel free to check my portfolio and reviews to see the quality of my work and the satisfaction of my clients 🔥
Contact me now to get started! 🚀
Feel free to check my portfolio and reviews to see the quality of my work and the satisfaction of my clients 🔥
Contact me now to get started! 🚀
Programming Languages
JavaScript, Python, KotlinCoding Expertise
Cross Browser & Device Compatibility, Localization, SecurityWhat's included $40
These options are included with the project scope.
$40
- Delivery Time 2 days
- Number of Revisions 2
- Source Code
8 reviews
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SU
Simon U.
Jun 4, 2026
Code the language learning app LinguaLeap/Disign exists already
Honestly one of the best dev experiences we’ve had on Upwork. Olearis team built our Flutter language learning app and absolutely nailed it. The project wasn’t easy (custom learning logic, gamified flows, tons of interactive screens) and they handled all of it like pros. The team understood what we wanted, followed the designs closely, and was always easy to talk to. They were responsive and really cared about making the product work well. I’d gladly work with them more.
OL
Olena L.
Apr 14, 2026
React Engineer for Platform Audit & Future Collaboration
It was a great experience working with this React Developer and the whole team at Olearis. Communication was smooth and clear, and everything was handled quickly and professionally. They delivered fast and with high quality. Looking forward to working together again in the future.
JW
James W.
Mar 24, 2026
Need : team of passionate, highly experienced web developers (SEO, usability, AI photo editor)
Great job!Thank you for amazing work by olearis team. Great communication and execution! Best of luck :)
JB
Josh B.
Mar 14, 2026
Teamword Game
Olearis was a fantastic partner throughout my work with them. Very responsive, creative, fast and easy to work with. I'd highly recommend them!
RG
Ronnie G.
Jul 31, 2025
Full Stack App Developer
10/10!!! Alexander and his team are highly skilled, efficient, knowledgeable and easy to work with. They take great care and detail with your requirements. Your success is their highest priority. Whilst other developers generally are looking for billable hours, Alex and his team have structure and analysis in place to ensure that your idea work to successfully convert leads. I've worked with many developers over the last 7 years and have not come across a company that specialises in conversion success backed up with quality developement like this company. You can't go wrong!
About Alexander
Full Stack Developer | React Developer | AI Development | React.js
100%
Job Success
Kyiv, Ukraine - 12:44 am local time
⚛️ React Developer • Full Stack Developer • AI Developer
🔥 𝗖𝗹𝗲𝗮𝗻 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲, 𝗳𝗲𝘄𝗲𝗿 𝗿𝗲𝗯𝘂𝗶𝗹𝗱𝘀, 𝗳𝗮𝘀𝘁𝗲𝗿 𝗹𝗮𝘂𝗻𝗰𝗵
I help startups build web, mobile, and AI products that are easier to launch, scale, and maintain — so you don't pay to fix the same things twice.
📊 𝗥𝗲𝘀𝘂𝗹𝘁𝘀 𝗳𝗿𝗼𝗺 𝘁𝗵𝗮𝘁 𝗮𝗽𝗽𝗿𝗼𝗮𝗰𝗵
🚀 12M+ users in social mobile products
⭐ 1M+ users & 4.8 App Store rating in AI mental health apps
🏦 Secure software trusted by Bank of America and Citibank
🤖 AI platforms, automation, dashboards & smart workflows for real products
🧩 𝗪𝗵𝗮𝘁 𝗜 𝘄𝗼𝗿𝗸 𝗮𝗰𝗿𝗼𝘀𝘀
I lead builds end to end as a full stack developer, web developer, React developer, react native developer, mobile app developer, Python developer, AI Developer, and WordPress developer — React, full stack development, mobile apps, Python and FastAPI backends, Firebase, machine learning, and AI features. 16+ years in production, with a team behind me. The rule is simple: build it properly from the start, so your next developer doesn't have to rewrite it later.
🔥 𝗪𝗵𝗮𝘁 𝗜 𝗵𝗲𝗹𝗽 𝘄𝗶𝘁𝗵
⚛️ 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 & 𝘄𝗲𝗯 — As a React developer and web developer, my team and I build SaaS platforms, dashboards, admin panels, marketplaces, and web apps that are clean, fast, and easy to extend. A good React developer and web developer cares about more than screens: performance, reusable components, API logic, and long-term maintainability.
🧱 𝗙𝘂𝗹𝗹 𝘀𝘁𝗮𝗰𝗸 — As the full stack developer owning the architecture, I connect frontend, backend, mobile, Firebase, FastAPI, and AI logic into one stable system — no endless handoffs, no expensive rebuilds. Whether you need a web developer, a React developer, a mobile app developer, or a full stack developer, you get one owner instead of five.
🤖 𝗔𝗜 — On the AI Developer side, we build AI that's useful inside the product: assistants, LLM workflows, recommendations, automation, and AI dashboards. With strong machine learning, data scientist, and python developer experience, we wire in real data work: a data scientist explores it, a Python developer turns it into services, and an AI Developer ships it — so machine learning features are useful, not just clever in a demo.
🐍 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 & 𝗣𝘆𝘁𝗵𝗼𝗻 — As a Python developer with deep FastAPI experience, I build APIs, integrations, automation, machine learning workflows, and backends that handle real users. If your backend feels fragile, I step in as a Python developer and full stack developer to clean it up — readable, tested, easy for the next data scientist or web developer to support.
📱 𝗠𝗼𝗯𝗶𝗹𝗲 — As a react native developer and mobile app developer, I build iOS and Android apps that connect cleanly to backends, APIs, subscriptions, payments, and push. A strong react native developer and mobile app developer thinks about performance, release flow, and future support. Need cross-platform? A flutter developer can support Flutter or help you choose between React Native, Flutter, and native.
🌐 𝗪𝗼𝗿𝗱𝗣𝗿𝗲𝘀𝘀 — As a WordPress developer, I handle marketing sites, landing pages, and CMS builds beside the main product, so your React developer, full stack developer, and WordPress developer work stays one consistent product story.
𝗣𝗿𝗼𝗱𝘂𝗰𝘁 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲
🟣 𝗣𝗮𝗿𝗹𝗼𝗿 — social platform, 12M+ users
🟢 𝗨𝗽𝗟𝗶𝗳𝗲 — AI mental health app, 1M+ users, 4.8★
🔵 𝗡𝗼𝘁𝗮𝘁𝗲 — secure productivity, trusted by Bank of America & Citibank
🟠 𝗙𝗶𝗹𝗹𝗿𝗿 — AI document app with smart parsing
🔴 𝗕𝗲𝗮𝘁𝗹𝘆 — SaaS connected to Netflix, Uber, Spotify & 250M+ creators
🟤 𝗛𝗲𝗮𝗿𝗠𝗲𝗢𝘂𝘁 — AI 24/7 therapy companion
⚪ 𝗘𝘅𝗮𝗺 𝗣𝗿𝗲𝗽 𝗔𝗽𝗽𝘀 — 36+ education apps with AI tutor logic
💰 𝗪𝗵𝘆 𝘁𝗵𝗶𝘀 𝘀𝗮𝘃𝗲𝘀 𝘆𝗼𝘂𝗿 𝗯𝘂𝗱𝗴𝗲𝘁
✅ Clean React developer and web developer work = fewer frontend bugs.
✅ Thoughtful full stack developer work = frontend, backend, mobile aren't fighting each other.
✅ Reliable Python developer and FastAPI work = a backend easy to scale and monitor.
✅ Good react native developer, flutter developer, and mobile app developer work = fewer mobile fixes after release.
✅ Practical AI Developer, machine learning, and data scientist work = AI features that are useful, not trendy.
📩 If you need a React developer, web developer, full stack developer, react native developer, mobile app developer, WordPress developer, Python developer, AI Developer, machine learning engineer, or data scientist who builds cleanly from the start - send me a message. I usually respond fast.
Steps for completing your project
After purchasing the project, send requirements so Alexander can start the project.
Delivery time starts when Alexander receives requirements from you.
Alexander works on your project following the steps below.
Revisions may occur after the delivery date.
Client purchases the consultation service
We agree on a meeting time via messages.
Client sends detailed requirements
Provide designs and/or a detailed description of your idea, including all features and requirements for the web application/page.