Publication
CSS Layout Tutorial: From Classic Approaches to the Latest Techniques
https://www.toptal.com/developers/css/css-layout-primer-from-classic-approaches-to-the-latest-techniques
Laureano is available for hire
Hire LaureanoLaureano Martin Arcanio
Verified Expert in Engineering
Full-stack Developer
Córdoba, Cordoba, Argentina
Toptal member since February 5, 2014
Bio
Laureano is an AI systems engineer specializing in large-language-model adaptation, evaluation, and scalable AI infrastructure. He designs end-to-end LLM pipelines from customer-driven dataset creation and model alignment to deterministic tool-calling validation within customer-facing agent systems. With 15+ years of engineering experience, he works across front end, back end, and ML infrastructure to deliver production-grade AI solutions.
Portfolio
ExOne Global Holdings
Full-stack Development, API Integration, Workflow Automation...
ExOne Global Holdings
Full-stack Development, API Integration, Workflow Automation...
Neo Elm LLC
Python, JavaScript, API Integration, Azure, Amazon Web Services (AWS), React...
Experience
- Full-stack - 15 years
- Python - 8 years
- Machine Learning - 6 years
- Artificial Intelligence (AI) - 6 years
- Data Science - 5 years
- Large Language Models (LLMs) - 5 years
- AI Agents - 2 years
Work Experience
[FT] Senior Full Stack Engineer for Industrial Manufacturing Marketplace
2026 - 2026
ExOne Global Holdings
- Built a manufacturing marketplace spanning customer, vendor, and ops portals across the full RFQ-to-payout lifecycle.
- Shipped instant cost estimatioTriaged and delivered 42 tasks (~145 person-days) across 6 implementation waves from a client feedback roundn from STL files and automated vendor matching.
- Triaged and delivered 250 tasks (~145 person-days) across 6 implementation waves from a client feedback round.
Technologies: Full-stack Development, API Integration, Workflow Automation, Single Sign-on (SSO), Payment APIs, Marketplaces, RFQ, React, Node.js
AI/Full-stack Engineer — Siegfried, ExOne RAG Platform
2026 - 2026
ExOne Global Holdings
- Built an enterprise RAG support platform for 3D sand-printer technical documentation, with hybrid retrieval (pgvector + full-text, RRF-fused) and reranking.
- Implemented DOM-aware chunking to cite exact manual sections, plus automatic Salesforce-case triage.
- Established a role-based multi-agent dev workflow (product owner, tech lead, backend/frontend/AI specialists, QA, security reviewer) gated by complexity/risk scoring across 800+ commits.
Technologies: Full-stack Development, API Integration, Workflow Automation, Single Sign-on (SSO), Payment APIs, Marketplaces, RFQ, React, Node.js
Software Architect
2026 - 2026
Neo Elm LLC
- Automated a utility-billing pipeline for a 171-unit student-housing property, ingesting ~175 monthly invoices by email.
- Built exact-cent cost proration by occupancy and idempotent posting to the Entrata PMS.
- Built exact-cent cost proration by occupancy and idempotent posting to the Entrata PMS.
Technologies: Python, JavaScript, API Integration, Azure, Amazon Web Services (AWS), React, Next.js
Entrepreneurship, Founder.
2025 - 2026
Atentina
- Founded and built Atentina, a multi-tenant telephony voice-agent platform with a fully self-hosted inference stack (STT/LLM/TTS on local GPUs, no external AI vendors).
- Benchmarked and fine-tuned STT/TTS models, sustaining ~32 concurrent calls at p95 ≤ 3s over a LiveKit + Asterisk/SIP pipeline.
- Shipped WhatsApp and payment integrations to production.
- Onboarded first client app (SUGYM): an MCP-based backend exposing 19 typed tools so the voice/WhatsApp agent can manage a gym's students, attendance, fees, and payments.
Technologies: AI Agents, Voice, Machine Learning, Infrastructure, Sales
Senior AI Systems Engineer
2025 - 2026
Liberate Innovations, Inc.
- Designed and curated large-scale conversational datasets, implementing PII masking, graph-based filtering, and synthetic data augmentation to improve training signal quality and reduce noise across dialogue tasks.
- Fine-tuned Gemma, LLaMA, and GPT-OSS models using supervised fine-tuning (SFT) pipelines, enhancing multi-turn dialogue coherence, instruction following, and structured tool-calling behavior.
- Built automated evaluation frameworks leveraging deterministic checks for tool-calling correctness and LLM-based grading to evaluate conversational quality and reasoning consistency across diverse conversational datasets.
- Developed agent orchestration systems using LangChain, LangGraph, and LiveKit, enabling multi-agent workflows, tool-calling pipelines, and real-time conversational state management.
- Designed and optimized high-performance LLM serving infrastructure using vLLM, SGLang, and llama.cpp, applying systematic profiling, benchmarking, and GPU memory optimization to improve throughput, latency, and deployment stability.
Technologies: Python, Open-source LLMs, Large Language Models (LLMs), Fine-tuning, Transformers, LangChain, Pandas, NumPy, AI Automation, Artificial Intelligence (AI), AI Agents, Machine Learning, PyTorch, API Integration, Prompt Engineering
Full-stack Developer
2025 - 2025
Tempus Insights
- Designed and implemented a full-stack sourcing tracker module for Tempus Insights' research platform, enabling efficient management of 1,000+ expert profiles and streamlining the end-to-end sourcing process.
- Developed forecasting algorithms that analyze pipeline metrics, including completion rates, conversion likelihoods, and outreach velocity, to predict research project outcomes.
- Led database schema redesign for core tables (experts, projects, calls, projectexperts) while maintaining backward compatibility with existing transcription workflows.
- Built interactive dashboards with real-time metrics that significantly improved sourcing status visibility and team capacity planning.
- Implemented a segment-based categorization system that enhanced expert organization and re-engagement capabilities for longitudinal research.
Technologies: React, Python, TypeScript, FastAPI, Amazon Web Services (AWS), Pandas, AI Automation, Artificial Intelligence (AI), Machine Learning, API Integration, LangChain, Prompt Engineering
Front-end Developer
2024 - 2025
CloneOps.AI LLC
- Implemented custom agent creation components in React, consuming existing APIs.
- Integrated custom tool creation components in React, consuming existing APIs.
- Integrated Vercel IA SDK with the React application for custom inline agent operations.
Technologies: React, JavaScript, React Redux, GraphQL, REST APIs, CSS, Large Language Models (LLMs), AI Automation, Artificial Intelligence (AI), AI Agents, API Integration, LangChain, Prompt Engineering
Front-end Developer
2022 - 2024
Rooms To Go
- Designed and implemented new user-facing product tiles across the entire site, enhancing the user interface and improving overall user experience.
- Resolved over 100 production issues and implemented cross-site improvements, improving performance times and user satisfaction.
- Developed over 200 features sized from S to XXL, impacting critical business units such as Search, Faceting, Product Tiles, and many more.
- Addressed immediate user needs and streamlined workflows by developing over 200 features across a spectrum of sizes, reducing development time for future enhancements, which allowed the team to allocate resources more effectively.
Technologies: React, Gatsby, Next.js, Material UI, GraphQL, Tailwind CSS, Apollo, TypeScript, API Integration
Senior Full-stack Developer
2021 - 2022
AB InBev
- Developed API endpoints to fully manage bank transfers for company payments to third-party businesses and clients.
- Implemented unit tests for deliverable code, making some other existing code more testable.
- Set up and built a dashboard React app for managing users, transactions, authorization, and many other back office operations.
- Developed a custom logging tool for "Business" level logs for none technically related administrators. This feature included back-end API (from scratch), a back office tool, and adding a logging code to all the client's platform.
Technologies: TypeScript, Node.js, PostgreSQL, Koa, MUI CSS, User Interface (UI), JavaScript, React, Objectify, Apache Kafka, Full-stack, REST APIs, Stripe, Back-end, API Integration
Senior Full-stack Developer
2020 - 2021
BAZZE & COMPANY
- Built a client-facing application for a location data marketplace.
- Integrated payment, authorization, and authentication flow.
- Built API usage pricing algorithms based on business logic.
- Developed acceptance automated tests for the UI and back-end.
Technologies: Python, Amazon Web Services (AWS), Vue, Testing, Flask, User Interface (UI), JavaScript, React, Node.js, Data Science, TypeScript, PostgreSQL, Full-stack, REST APIs, Stripe, Back-end, API Integration
Front-end Developer
2019 - 2020
Sonato
- Jumped into an existing Vue project and rebuilt it based on design specifications.
- Created animated landing pages for mobile and desktop.
- Worked on different projects inside the company to add features or develop new ones from scratch.
Technologies: Python, Vue, React, User Interface (UI), JavaScript, TypeScript, REST APIs, API Integration
Front-end Developer
2018 - 2019
Syllable
- Developed an embedded AI-driven chat app for hospitals and organizations.
- Handled cross-browser implementations with great visual quality and consistency.
- Collaborated with teams and worked with designers and developers on many POC projects.
Technologies: Docker, Node.js, Redux, React, User Interface (UI), JavaScript, REST APIs
Full-stack Engineer
2017 - 2017
Mariner Exchange
- Refactored major parts of the system to support proper URL and search engine crawling of the site.
- Improved site traffic starting from content coercion, relevant linking, and proper tagging. Used data analysis from Google Analytics metrics.
- Used data analysis to help design data features like top locations, top services, and recommendations.
Technologies: Data Science, Data Analysis, Search Engine Optimization (SEO), Python, CSS, Ember.js, User Interface (UI), JavaScript, Node.js, Back-end
Senior Front-end Developer
2016 - 2017
Trumaker (via Toptal)
- Reimplemented a user interface for an existing eCommerce platform.
- Developed features and fixed bugs.
- Optimized performance.
- Migrated the whole codebase from Ember 1.12 to Ember 2.13.
Technologies: Ember.js, User Interface (UI), React, Node.js
Front-end Developer
2015 - 2016
Medify, Ltd. (via Toptal)
- Built an online exam app for university applicants in the UK. Fully backed with unit and acceptance testing, currently on production and being used by thousands of users.
- Supported multiple browsers and ecosystems.
- Built CSS from scratch using Flexbox and top-notch technologies.
- Provided integration and acceptance testing for all of the app's features.
Technologies: Ember.js, User Interface (UI), JavaScript, Test-driven Development (TDD)
Ember Front-end Developer
2015 - 2015
Cropster (via Toptal)
- Built an MVP of a hybrid app for coffee cupping.
- Used the latest CSS3 technologies to be fully adaptable across devices (Flexbox).
- Tested using Apple TestFlight with real customers.
- Designed the app to work offline and automatically sync to the server.
- Built on top of Cordova to be portable across platforms.
- Submitted to the Apple iTunes store for beta testing.
Technologies: Ember.js, User Interface (UI), JavaScript
Front-end Developer
2015 - 2015
DoubleBit Consulting (via Toptal)
- Built a CRM platform for the roofing industry.
- Focused on implementing new features for an MVP release.
- Implemented Gitflow and code reviews as a quality rule.
Technologies: REST, Bootstrap, User Interface (UI)
Front-end Developer
2014 - 2015
Monsoon (via Toptal)
- Implemented designs into an existing Ember.js app.
- Fixed features that weren't styled to better match designs.
- Handled cross-browser testing and fixes.
- Implemented features as a part of a Scrum team.
Technologies: Bootstrap, Ember.js, User Interface (UI), JavaScript
Front-end Responsive Designer
2014 - 2014
GroupVitals (via Toptal)
- Handled UI design and implementation.
- Converted from PSD to HTML.
- Handled general bug fixing.
- Implemented performance optimizations.
Technologies: MySQL, CSS, HTML
Senior Front-end Developer
2011 - 2014
Intel Corporation
- Designed the CSS and HTML framework used since release 3.4 of the Intel AppUp Store Center.
- Designed and implemented the branding and customization framework used for many Intel partner stores.
- Prototyped for usability tests for several internal projects that are used to showcase many technologies to outside stakeholders.
- Evangelized CSS at Intel ASDC Argentina.
- Developed multiplatform mobile prototypes using Intel XDK.
- Performed image processing with JavaScript for face recognition software.
Technologies: JavaScript, CSS, HTML5
Instructor
2011 - 2013
Capacitacion IT
- Worked as HTML5 trainer for over two years leveling up people from different areas such as design, developers, and communicators.
- Worked as a user experience trainer for over a year.
Technologies: UI Design, HTML5
Web Developer
2010 - 2011
Manpower
- Developed the first Intel AppUp store UI based on HTML5 technologies that served as a prototype for future releases.
- Created a reusable JavaScript framework to be used as a working base for AppUp Store future releases.
Technologies: CSS, HTML, JavaScript
Web Developer
2009 - 2010
Adventure Sports Holidays
- Worked as an end-to-end developer doing new features and handling bug fixes.
- Created an automated backup system using Cron Jobs and Bash to keep MySQL dumps safe on other servers.
- Generated reports from transactions, for example: “Best seller suppliers for the last month.”.
- Handled PSD to HTML translation for several pages of the company.
- Created a PHP MVC framework for internal use that met a particular set of requirements for the company.
Technologies: Bash, MySQL, JavaScript, CSS, HTML, Python
Systems Developer
2007 - 2009
Contractor at FEMUCOR
- Developed an administration ecosystem for FEMUCOR Argentina (OMG), a client-server based solution developed with Python and Linux.
- Developed a paperwork administration and task scheduling system.
- Created an entities administration, querying, and reporting tool.
- Developed a payments and account balances system.
- Handled server and client installation, configuration, and administration based on Linux/Windows.
- Created a mailing system for entities with overdue pay balances.
Technologies: CSS, JavaScript, HTML, Python
Co-owner in Sales and IT Services
2006 - 2007
Condhor Hardware
- Resold hardware and managed stock.
- Created IT services based on Windows and Linux.
- Handled network configuration and administration.
- Consulted about hardware and software products.
Technologies: Hardware, Networks, Windows, Linux
Visual Studio Developer (Contract)
2002 - 2004
Pizza 12
- Created a point-of-sale system based on the Windows platform.
- Developed the communication driver to be able to use Fiscal printers.
- Created a stock system to be used by the administration based on point of sale information.
Technologies: Visual Studio
Project History
PostCSS Plugin
https://github.com/laureanoarcanio/postcss-shades-of-grayThis plugin removes unneeded similar grey color from a CSS file and replaces them with the closest from a given set of grays.
CSS Layout Techniques Explained
https://github.com/laureanoarcanio/css-layout-examplesA sample project exploring CSS classic layout techniques compared to Flexbox and GridLayout.
Advanced CSS Toptal Academy Talk
https://www.youtube.com/watch?v=vQLEq-TmOzQ&t=12sLive talk streamed worldwide about Advanced CSS techniques. Exploring Classic, CSS3, Flexbox, and Grid techniques for layout.
CapitalLetter jQuery Plugin
https://github.com/laureanoarcanio/capitalletterI created this plugin to facilitate the use of capital letter style for designers and developers. It has been adopted by many people around the world by now.
Elastic Layout (Responsive Implementation)
https://github.com/laureanoarcanio/elastic-layoutCode samples created for a talk about this state-of-the-art technique for achieving responsiveness with a new set of (forgotten) techniques.
Website Front-end Presentation Layer
Worked as a part of an amazing Scrum team doing front-end development work and focusing on the presentation layer.
Group Ministry Web App Front-end
http://www.groupvitals.com/Worked as a part of an end-to-end team doing design and front-end for this awesome group ministry app.
Arduino Rocket Flight Computer
https://github.com/laureano-arcanio/arduino-rocket-computerArduino-based hardware and software for model rockets recovery and logging system. The hardware consists of an Arduino nano board, a gyroscope, a pressure sensor, and an SD card reader. The project includes software and hardware layout and the rocket 3D model for 3D printing.
Education
2010 - 2015
Coursework Toward a Bachelor's Degree in Graphic Design
IES Siglo 21 - Cordoba, Argentina
2004 - 2007
Coursework Toward a Bachelor's Degree in Physics
FAMAF - Cordoba, Argentina
Skills
Libraries/APIs
React, Vue, Node.js, Objectify, REST APIs, PyTorch, Pandas, NumPy, Stripe, React Redux
Languages
Python, JavaScript, HTML5, CSS, TypeScript, HTML, Bash, GraphQL
Frameworks
Ember.js, Koa, Bootstrap, Redux, Flask, MUI CSS, Next.js, Material UI, Tailwind CSS
Paradigms
UI Design, REST, Search Engine Optimization (SEO), Test-driven Development (TDD), Testing, Model Context Protocol (MCP)
Platforms
Apache Kafka, Docker, Amazon Web Services (AWS), Arduino, Azure
Storage
PostgreSQL, Redis, MySQL
Other
Data Science, User Interface (UI), Full-stack, Back-end, FastAPI, Prompt Engineering, Machine Learning, AI Agents, Artificial Intelligence (AI), API Integration, AI Automation, Headless CMS, Data Analysis, Gatsby, Graphic Design, Mathematics, Physics, Apollo, Large Language Models (LLMs), Open-source LLMs, Fine-tuning, Transformers, LangChain, Full-stack Development, Workflow Automation, Single Sign-on (SSO), Payment APIs, Marketplaces, RFQ, Voice, Infrastructure, Sales
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