Aleksei Laud, Developer in Coimbra, Portugal
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Aleksei Laud

Software Engineer and Developer

Coimbra, Portugal

Toptal member since March 25, 2026

Bio

Aleksei is a senior full-stack engineer with 10+ years of experience building complex, high-performance web applications. He has worked on large-scale platforms with millions of users and developed advanced interactive products, including editors and real-time systems. Aleksei focuses on clean architecture, performance, and delivering production-ready solutions end-to-end.

Portfolio

YouGile
TypeScript, Node.js, React, MobX, Express.js, Bun, Vite, REST, REST APIs...
Visme
TypeScript, React, MobX, Node.js, PostgreSQL, GSAP, SQL, SCSS, Docker...
Leroy Merlin
TypeScript, React, TanStack Query, Node.js, Jenkins, CI/CD Pipelines, CSS, HTML...

Experience

  • JavaScript - 10 years
  • Front-end Development - 10 years
  • Node.js - 9 years
  • React - 8 years
  • Full-stack Development - 8 years
  • TypeScript - 8 years
  • Performance - 6 years
  • SQL - 5 years

Preferred Environment

Linux, Node.js, TypeScript, JavaScript

The most amazing...

...thing I've developed is a real-time in-browser fluid physics simulation.

Work Experience

Senior Full-stack Developer

2024 - PRESENT
YouGile
  • Delivered end-to-end collaboration features for chats and group messaging, including invite flows, personal chats, reactions, unread counters, and message-forwarding scenarios.
  • Improved lazy loading, sync, search, and caching flows to keep large workspaces responsive and data consistent across the product.
  • Developed QR-code authentication and refined login, registration, and onboarding flows across the web client and desktop experience.
  • Shipped reporting and Gantt improvements, including dashboard behavior, exports, analytics instrumentation, and usability updates for planning workflows.
  • Adapted core product flows for self-hosted and standalone deployments, adding feature gating and environment-specific behavior where required.
  • Strengthened messenger permissions and access logic, reducing edge-case failures in chat settings, invite links, membership updates, and profile-driven chat state.
Technologies: TypeScript, Node.js, React, MobX, Express.js, Bun, Vite, REST, REST APIs, WebSockets, Electron, Tailwind CSS, Performance, Full-stack, Full-stack Development, Front-end, Front-end Development, Back-end, Back-end Development

Senior Software Engineer

2022 - 2026
Visme
  • Drove canvas navigation, interaction handling, and shared UI state improvements that made complex projects easier to build and maintain.
  • Led granular locking and permission-aware editing, enabling safer work on grouped, nested, and branded content.
  • Built the Page Creator and mobile foundations required to generate, sync, and edit desktop and mobile project variants.
  • Hardened synchronization, regeneration, and state recovery to reduce breakage in collaborative sessions.
  • Improved copy/paste fidelity, list handling, selection behavior, and style preservation to make editing more predictable.
  • Unified object, slide, and settings models across editor and player, reducing inconsistencies and simplifying feature delivery.
  • Shipped product capabilities that required coordinated changes across player experiences, publishing flows, API contracts, bootstrap data, and migrations.
Technologies: TypeScript, React, MobX, Node.js, PostgreSQL, GSAP, SQL, SCSS, Docker, Performance, CSS, HTML, REST, API Integration, Full-stack, Full-stack Development, REST APIs, APIs, Front-end, Front-end Development, Role-based Access Control (RBAC), WYSIWYG Web Builders

Senior Front-end Developer

2021 - 2022
Leroy Merlin
  • Built a UI for an internal product-to-service management tool used by business teams.
  • Set up CI/CD pipelines with automated testing and improved release processes.
  • Collaborated with design and QA teams to ensure consistent and high-quality UX.
Technologies: TypeScript, React, TanStack Query, Node.js, Jenkins, CI/CD Pipelines, CSS, HTML, REST, Storybook, UI Components, API Integration, API Development, REST APIs, APIs, Front-end, Front-end Development, Express.js, Minimum Viable Product (MVP)

Senior/Lead Front-end Developer

2018 - 2021
HeadHunter Group
  • Developed and maintained a UI for hh.ru and talantix.ru with millions of active users.
  • Improved development processes and worked closely with product and design teams.
  • Built and maintained a shared UI component library using Storybook for consistency.
Technologies: JavaScript, TypeScript, Python, React, Redux, SCSS, CSS, HTML, REST, UI Components, API Integration, REST APIs, APIs

Experience

Presentation Editor | Visme

https://www.visme.co/
A complex, front-end-heavy presentation editor used by a large user base for creating interactive content. The system includes advanced features such as infinite canvas, native interactions, and rich editing tools. It is designed to handle real-time interactions with a strong focus on rendering performance and smooth user experience.

The project required solving challenging UI problems and building a scalable front-end architecture in close collaboration with product and design teams.

Sandbox | Interactive Particle Simulation

https://sandbox.alekseilaud.dev
Sandbox 4 is a browser-based interactive particle simulation that lets users create and combine different elements in a real-time physics environment and observe how they react to gravity, temperature, liquids, electricity, light, explosions, and other dynamic forces.

I developed the core simulation engine in TypeScript, implemented the particle-processing architecture, and built the UI for selecting elements, controlling time, and adjusting simulation settings.

The project includes a wide set of custom behaviors for materials such as water, sand, lava, gas, metal, fire, electricity, plants, wind, detectors, and AI-driven entities like ants and worms. I also worked on performance-related systems, including point indexing, temperature processing, lighting calculations, and state persistence, which helped make the Sandbox responsive and extensible for adding new interactive elements and mechanics.

GPU-accelerated Fluid Simulation Web App

https://fluid.alekseilaud.dev
A GPU-accelerated web-based fluid simulation that visualizes real-time particle interactions in the browser. Built with a custom TypeScript engine and HTML5 Canvas, the project includes interactive controls for gravity, viscosity, particle count, rendering performance, and mouse-driven force interactions. It highlights performance-focused front-end engineering, browser-based physics simulation, and interactive data visualization techniques.

AI-powered Text RPG Bot for Telegram

https://t.me/k_rpg_bot
A Telegram-based text RPG project where players describe a world, receive an expanded setting, and continue the story through AI-generated scenes and choices. The bot acts as a game master, calculates action success probabilities, tracks characters and hidden game state, supports save-and-load flows, and lets users reuse or import world descriptions for new sessions. The solution is built with Node.js, Telegraf, persistent JSON storage, and integration with the Anthropic API for narrative generation and gameplay orchestration.

Evolution Ecosystem Strategy Game (Web)

https://evolution.alekseilaud.dev/
A browser-based multiplayer strategy game inspired by Evolution, where players build species, assign traits, and compete for limited resources in a dynamic ecosystem. I designed and implemented a full game engine that translates complex board game rules into a deterministic state machine, supporting hidden information and multi-step interactions.

The system includes a server-authoritative architecture using Node.js and Socket.IO, ensuring consistent multiplayer synchronization and conflict resolution. On the front end, I built an interaction-heavy UI with React and TypeScript, handling adjacency-based mechanics, legal action generation, and real-time updates.

A key challenge was modeling trait interactions (predator-prey logic, defensive abilities, chained effects) in a scalable way. I implemented a modular, callback-driven rules engine that enables flexible extension of game mechanics and supports custom traits beyond the base ruleset.

Skills

Libraries/APIs

React, MobX-State-Tree (MST), Socket.IO, Node.js, MobX, API Development, OpenAI API, REST APIs, GSAP

Tools

Canvas, Jenkins, Docker Compose

Languages

TypeScript, JavaScript, CSS, SQL, SCSS, HTML, Python

Paradigms

REST, Back-end Architecture, Role-based Access Control (RBAC)

Frameworks

Redux, Express.js, Tailwind CSS, Electron

Platforms

GreenSock Animation Platform (GSAP), Linux, Docker, Vercel

Storage

PostgreSQL

Other

TanStack Query, API Integration, UI Components, Full-stack, Front-end, Front-end Development, WebSockets, Performance, OpenAI, Anthropic, AI Integration, Full-stack Development, APIs, Back-end, Back-end Development, System Design, WYSIWYG Web Builders, Minimum Viable Product (MVP), Artificial Intelligence (AI), CI/CD Pipelines, ParcelJS, Game Physics, GPU.js, Storybook, HTML Canvas, Large Language Models (LLMs), Prompt Engineering, Game Back-end, Bun, Vite

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