# Aleksei User Aleksei User is a remote worker on Himalayas, Senior Full-Stack Developer at ARQ, based in Portugal. Source: https://himalayas.app/@alekseiuser6 ```text Senior Full-Stack Developer at ARQ who brought an AI video generation platform from scratch to production. ``` | Detail | Value | | --- | --- | | Availability | Looking for a job | | Location | Portugal | | Authorized to work in | Portugal, Germany, Netherlands, Spain | | Salary expectations | 40k+ EUR | | Job categories | Full Stack Developer, Front End Developer, Backend Engineer, Full Stack Developer | | Skills | Fullstack Development, Frontend Architecture, AI Video Generation, LLM Agents, Backend Development, REST APIs, Web3, Smart Contracts, Real Time Collaboration, System Design, TypeScript, JavaScript, Python, Solidity, SQL, Collaborative Editing, WebSockets, Event Driven Workers, Web3 Authentication, Web3 Payments | | LinkedIn | https://linkedin.com/in/aleksei-khakhalev-1441a1300 | | GitHub | https://github.com/halekseeey | ## About ```text At ARQ, I led frontend development and technical direction for an AI video generation platform, taking it from scratch to production. I designed an LLM-based video generation agent with Python, LangGraph, and LangChain, and connected it to the product’s content workflows. I also engineered a real-time collaborative canvas for AI content generation, using Yjs for state synchronization and WebSockets for communication. I built a video rendering service and designed REST APIs for the generation pipeline and frontend–backend integration. As a freelance developer, I’ve delivered client projects for Web2 and Web3 startups, including backend services, Solidity smart contracts, and wallet-based payment flows. At Yandex, I developed features for Yandex.Eats and improved its Lighthouse Accessibility score from about 70% to about 90%. ``` ## Experience ### Senior Full-Stack Developer (current) ARQ. Aug 2025 - Present ```text Led frontend development and technical direction for an AI-powered video content creation platform, defining system architecture and driving production release. Designed and implemented an LLM-based video generation agent and engineered a real-time collaborative canvas. ``` Skills: TypeScript, Python, LangGraph, Lang-Chain, React, Next.js, Zustand, Yjs, Xyflow, GSAP, Tailwind, Git ### Freelance Full-Stack Developer (current) Web2/Web3 startups and private clients. Feb 2024 - Present ```text Delivered 9 client projects end to end, from MVPs to production-ready products, for Web2 and Web3 startups. Built backend services in Node.js and Python, designed Solidity smart contracts, and implemented Web3 authentication and payment flows. ``` Skills: TypeScript, Python, NodeJS, React, Next.js, Svelte, Solidity, EthersJS, Wagmi, Hardhat, Foundry, GSAP, Tailwind ### Senior Full-Stack Developer NfinityAI. May 2024 - Jul 2025 ```text Took ownership of a new AI video generation product from the ground up, defining frontend architecture and leading implementation. Designed REST endpoints, optimized async request handling, and deployed an ERC-20 smart contract for internal credit token. ``` Skills: TypeScript, Svelte, React, Next.js, MobX, Xyflow, GSAP, Tailwind, Solidity, EthersJS, Wagmi, Hardhat, Git ### Frontend Developer Yandex. Oct 2023 - Feb 2024 ```text Developed new features and UI components for Yandex.Eats, refactored legacy code, and improved frontend architecture. Improved accessibility, raising Lighthouse Accessibility score from ~70% to ~90%, and wrote end-to-end tests with Playwright. ``` Skills: TypeScript, React, Next.js, MobX, Playwright ### Frontend Developer Bear Head Studio. Sep 2021 - Sep 2023 ```text Built responsive UI components and pages for a game catalog, product pages, and checkout flow. Integrated APIs for product listings, user accounts, payments, and order history, and improved page load speed with lazy loading and image optimization. ``` Skills: TypeScript, React, Next.js, MobX, SCSS, Axios ## Education ### University of Lisbon, ISEG, School of Economics and Management MSc, Management Information Systems. 2025 - Present ```text Pursuing an MSc in Management Information Systems with coursework in Data Management, Information Systems, Programming for Data Science, IT Project Management, and e-Business Technologies. Expected completion in June 2027. ``` ### University of Lisbon, ISEG, School of Economics and Management MSc, Management Information Systems. 2025 - Present ```text Pursuing an MSc in Management Information Systems with coursework in Data Management, Information Systems, Programming for Data Science, IT Project Management, and e-Business Technologies. Expected completion in June 2027. ``` ### National Research University Higher School of Economics (HSE) BSc, Information Science and Computation Technology. 2021 - 2025. Grade: 7.9/10.0 ```text BSc in Information Science and Computation Technology with a GPA of 7.9/10.0. Coursework included Algorithmization and Programming, Computer Science, Object-Oriented Programming, Databases, Programming of Web Services and Embedded Systems, and Mobile Applications Development. ``` ### National Research University Higher School of Economics (HSE) BSc, Information Science and Computation Technology. 2021 - 2025. Grade: 7.9/10.0 ```text BSc in Information Science and Computation Technology with a GPA of 7.9/10.0. Coursework included Algorithmization and Programming, Computer Science, Object-Oriented Programming, Databases, Programming of Web Services and Embedded Systems, and Mobile Applications Development. ``` ## Tech stack - PostgreSQL - Node.js - Next.js - React - Svelte - axios - JavaScript - Python - HTML5 - Zustand - TypeScript - Git - MobX - SQL - Solidity - Ethers.js - LangChain - Playwright - Foundry - Hardhat - Wagmi - Yjs - WalletConnect - LangGraph - REST APIs To contact Aleksei, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire). ## People also viewed - [Artur Sinisoo](https://himalayas.app/@arturs): Senior Full stack & Solidity Developer, Polarfi.io - [Pedro Trincheiras](https://himalayas.app/@pedrotrincheiras): Senior Full Stack Developer, DELLENT - [André Ginja](https://himalayas.app/@andrginja): Senior Software Engineer, Rarible - [Marcin Moldrzyk](https://himalayas.app/@marcinmoldrzyk): Senior Full Stack Engineer, Shardspace - [Fran Rom](https://himalayas.app/@franrom): Lead Frontend Engineer, Summon (Game7) - [Benjamin Liu](https://himalayas.app/@benjaminliu1): Senior Frontend Engineer, Shift Technology - [Raffaele Di Gennaro](https://himalayas.app/@raffaeledigennaro): AI Engineer & Full Stack Developer, Lasting Dynamics - [Oleg User](https://himalayas.app/@5450): Web Developer (independent), Self Employed - [Michael Yakimenko](https://himalayas.app/@michaelyakimenko): Frontend developer, Freelance - [Bruno Ricardo Bortagaray](https://himalayas.app/@brunoborta): Founder & Frontend Engineer, CVTailor