Expert React & Next.js development for complex, data-intensive and interactive web applications — AI-powered apps, CRMs, SaaS Dashboards, User Management Systems, and API integrations.
Details
For the last decade I have been working on various projects starting from developing Landing Pages, Marketplaces and up to Messengers, and Next.js Web Applications Builder. Eventually, I found my passion in building complex products, that are meant to simplify life and optimize business processes. Are you looking to build or improve one?
Services
Connecting...
Real-Time Collaboration Apps
Whether your app is for real-time collaboration of distributed teams like Figma or your users need to see data updates instantly, like Binance, it comes with the similar set of challenges and require niche knowledge to leverage modern technologies and keep the app performant
This interactive canvas demonstrates the power of WebRTC and selective forwarding. Every cursor with a flag you see is a real person, exploring this space with you.
Web applications development
Interface builders
When your product needs to give users creative control — whether that's building pages, designing workflows, or configuring complex rules — off-the-shelf solutions stop working quickly. The moment users need more than a settings panel, you need a real builder: one with drag-and-drop, undo/redo, live preview, and the ability to serialise and restore user-created layouts reliably.The challenge is that builders feel deceptively simple until you're six months in and refactoring your state model. Getting the architecture right from the start — the component tree structure, the action/history stack, the rendering engine — is what separates builders that scale from ones that become unmaintainable.
MVPs
Getting to product-market fit is a process of fast, informed iteration — not a single well-planned build. The SDLC gets stripped to its essentials: short cycles, direct client involvement at every stage, and scope decisions made on signal rather than assumption.Close collaboration with stakeholders through the build — frequent demos, shared prioritisation, rapid feedback loops — is what keeps the product converging on what users actually need rather than what was planned at kickoff.
Examples?
More details?
MoreDetails?
10+Years of experience
- 2011
Start - 2012
- 2013
- 2014
- 2015
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
6000Hours on freelance
Expertise in building
Clients from
20+
countries
Startups founded:3
5Star reviews
on upwork
on upwork
Let's connect!
Say hi at hi@levchenkod.com